FOR SALE Performance EPROM chips for all years 500E / E500 (and S500/SL500 through 1995)

[gsxr]

A chip for the 4.2L engines (400E/E420, 400SE/S420) is available on request; PM me for details. I'll start a separate thread for the 4.2L if needed.
===============================================================================

I recently had someone ask if I would sell copies of a 'performance' chip for the E500E LH module.
The word 'performance' is used loosely here... there is no power gain with only the chip swap, but there are a few side benefits:

• Increase engine rev limiter from ~6300rpm to ~6650rpm
• Rev limit is softer/smoother (stock rev limiter is a harsh/bucking cutout at 6300rpm)
• Eliminates 155mph top speed governor
• Allows disabling the cold upshift delay* without triggering CEL on USA models
• *Note: This is not the same as first gear start - EPROM chips cannot enable FGS.

It's similar to the chip that JimF was selling here at $150 with wild claims of power gains. The chip was also seen here on eBay** for $120 ($108 on sale), minus the fancy printed label, before eBay cancelled all EPROM sales (see post #54 below). I wish I had thought to save the eBay listing before it was deleted forever. The power gains claimed by both sellers is greatly exaggerated (+10% to +18%!!) and totally false.

**Update 2022: eBay removed all products that modify engine performance, so that "eBay chip" is no longer available on eBay. I don't know if the seller is offering them elsewhere; they seem to have disappeared from eBay. Wish I had saved a screenshot of that page!​

This chip is for 5.0L engines (all years E500E, as well as 1993-95 500SL/SL500 and 1992-1995 500SEL/S500 with LH injection). Please note that the installation is not exactly "simple" as claimed in the eBay ad, it requires steady hands and extreme care to avoid damaging your LH module or the chips during R&R. If you have any experience with electronic components, it's a straightforward socketed EPROM swap, after removing the plastic cover (which is a PITA on the early modules, but easy on the late modules). <warning> If you've never done this stuff before I'd recommend finding a friend who has some experience with electronics. </warning>

Current pricing is $75 each delivered in USA, PayPal Friends & Family only, or Zelle. Bank wire is fine for international payments. Contact me for exact cost of shipping outside USA; most countries should be $20-$30 USD for First Class International Package (~$100 USD total to most countries). Priority or Express shipping cost is substantially higher.

If you want to buy a complete 1992 LH module with the chip pre-installed (stock chip would be included as well), I have a very limited supply of 1992 LH modules available (which does provide a power gain). Click here for details. If you would like me to install the chip in your LH module, that is another option, email me if you'd like to discuss that.

Please send me the part number of the LH module you plan to install this EPROM in, so I can verify compatibility - thanks!

 

[Maui]

Re: FEELER: Any interest in 'performance' chips?

But wait, the ebay seller says it will increase HP and torque 10% to 15%. That's a big claim for $120.

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

But wait, the ebay seller says it will increase HP and torque 10% to 15%. That's a big claim for $120.

And it has left me absolutely speechless that the guy has sold literally hundreds, if not thousands, of these things over the past 10+ years... and nobody calls him out on the false claims. Why? Because they don't dyno their cars, to find out they've been snookered! I bought one years ago to see what it was, and left neutral feedback with the comment that there was no power gain on the dyno. He contacted me all upset, and referenced all the happy customers he has. But his marketing didn't change one bit. It's literally not possible to swap an EPROM in an LH module and get 10-15% power gain. Can't be done. (I'd love for someone to prove me wrong, but if they could, they'd have done it long ago and be rich.)

I also bought one of his 400E chips for our E420 (with 1992 400E LH module). Imagine my surprise when I found the chip was the same 500E chip, with a 400E label on it. Identical hex code! I returned it for a refund explaining that I wanted a 4.2L chip, not a 5.0L chip. He said he'd have to contact his source in Germany, who was on holiday at the time, and it would be a few weeks. Never heard back.

I could select the modifications out of the 500E program and create a custom 4.2L chip. But I had no need for it personally, I've been happy with a stock 92 400E LH module. And, I didn't think there would be any market for me to sell a proper/correct chip, competing against the other guy. I kinda feel bad for all the folks who buy a chip for their 4.2L engine and have no idea it's running with a 5.0 fuel curve. The 4.2L engine will not make more power on a 5.0 program, btw... and could possibly cause issues passing smog if you live in a strict area (LA, Sacramento, etc).

 

[Marc R]

Re: FEELER: Any interest in 'performance' chips?

Emailed you Dave...

 

[Taxi Driver]

Re: FEELER: Any interest in 'performance' chips?

I recently had someone ask if I would sell copies of a 'performance' chip for the E500E LH module. The word 'performance' is used loosely here... there is no power gain with only the chip swap, but there are a few side benefits:

Increasing rev limit + Top speed delimit + Coldstart up... no issue imo. Does anyone here, belive we can have a free lunch to the cost of a ,,chip,,?

They should read all the threads concerning performance etc. This is a NA motor, fairly optimised by factory. M119 974 ~320-330 hp next level M119.980 E50 ~350hp not achieved by a "chip" a lot of hardware changes it was, I tell you.

Do the needed changes first, then, reprogramme or chip. Roger

 

[Marc R]

Re: FEELER: Any interest in 'performance' chips?

I know this, I want the governor out..not expecting any extra power

 

[bing]

Re: FEELER: Any interest in 'performance' chips?

Will this work on E60 LH ??

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

Increasing rev limit + Top speed delimit + Coldstart up...no issue imo. Does anyone here, belive we can have a free lunch to the cost of a ,,chip,,?

Those are the 3 benefits - no power gain. I edited the original post to clarify in bold red text. Increased rev limit is desirable for some people, primarily for track/autocross use. Top speed delimit is only for Autobahn drivers, or maybe Bonneville Salt Flats. Cold upshift delay... you'd be surprised how many people hate this emissions "feature".

Will this work on E60 LH ??

This chip - no, it will not work properly in any E60 LH application. It has 5.0L fuel mapping.
[EDIT: I could create a custom 6.0L module with the modifications, if desired, contact me for info.]

Similar to the 4.2L, I can create a custom program for the 6L, but I expect there would be near zero demand. Not sure how many people are willing to rev their 6L motors past the factory limit, but it would be easy enough to only remove/increase the top speed limiter.

 

[Raffaelli]

Re: FEELER: Any interest in 'performance' chips?

Is the fuel map burned into the removable chip? Is it a wot enriched map programmed in the chip? Or is that part of the PCM hardware?

Could your 5.0 chip be put in a 4.2 computer on a 5.0 engine?

I'm just curious how this thing works.

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

Is the fuel map burned into the removable chip?

Yes - the fuel mapping is on the EPROM, along with a whole bunch of other stuff (don't know exactly).

Is it a wot enriched map programmed in the chip? Or is that part of the PCM hardware?

AFAIK the WOT functionality is part of the module, not the chip. Rik (2phast) mentioned on his website that he installed the chip in his '93 module and dyno'd afterwards, and there was still no WOT enrichment.

Could your 5.0 chip be put in a 4.2 computer on a 5.0 engine?

Good question. I believe the answer is "yes" with a "but". The USA-spec 400E has additional hardware differences in the LH module for the 1-2 cold upshift delay, which was for the 2.24 gears used in USA/Japan only. Installing a 500E module in a USA-spec 400E causes weird transmission problems (that can be fixed with additional mods). However I'm not sure what happens if you put a 400E module (with 5.0 fuel mapping) in a 500E. I prefer to use the correct module for the chassis/engine combination.

I'm just curious how this thing works.

Me too. Documentation is non-existent for the Bosch LH-SFI v4.1 which appears to be a Mercedes-only implementation. Porsche 928's also used Bosch LH but it was not SFI, it was batch-fire injection... totally different modules & software. Sharktuner did neat stuff with the Porsche systems, but sadly they refused to touch the Mercedes version.

 

[jnes]

Re: FEELER: Any interest in 'performance' chips?

Gsxr, mail sent.

 

[Christian_K]

Re: FEELER: Any interest in 'performance' chips?

Dave, havent you said back in 2012 or so, that the ebay 500E chip alters the fuel curve so much that it goes to rich during WOT? AFR below 12?

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

Dave, havent you said back in 2012 or so, that the ebay 500E chip alters the fuel curve so much that it goes to rich during WOT? AFR below 12?

The fuel mapping is the same for all 5.0L chips. As mentioned back in post #10, I don't think the chip itself enables WOT enrichment on a late module. Rik tested this on the dyno and it didn't work. I have not personally dyno tested. I have this chip installed in all the 1992 LH modules in our personal 500E's. I don't remember saying anything back in 2012 though?

 

[maw1124]

Re: FEELER: Any interest in 'performance' chips?

My only comment here GSXR is that I have the RennTech eProm in an early '92 build with WOT enrichment. I still have the cold start upshift delay functionality. I can confirm the rev limiter change but not the top speed. Do you think these are different from the RennTech ones back in the day?

Cheers,

maw

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

My only comment here GSXR is that I have the RennTech eProm in an early '92 build with WOT enrichment. I still have the cold start upshift delay functionality. I can confirm the rev limiter change but not the top speed. Do you think these are different from the RennTech ones back in the day?

I suspect RENNtech may have offered a few different chips over the years. I doubt there is anyone still working there who would remember what they were doing 20 years ago though. Likely will remain a mystery.

That said: Someone loaned me a chip in 2011 that was allegedly a 1993 RENNtech chip. However, there was no label or marking to indicate it was a genuine RENNtech item. Whatever the origin, after reviewing the code on the chip, it appeared the only change was removal of the top speed limiter. Nothing else. (!!!?) If anyone has a confirmed RENNtech chip, and is willing to loan it to me for a couple days, I can take a look at the code and see what is changed compared to stock. Maw, it's interesting that your '92 RENNtech chip seems to have increased rev limit, while the '93 RENNtech chip I borrowed had stock rev limit.

On a related note, a generous forum member loaned me a SuperChips chip around the same time as I tested the '93 RENNtech chip. SuperChips appeared to remove the top speed limiter and also increased rev limit to ~6700rpm, and I think also eliminated the cold upshift delay. The SuperChips code is similar to, but not identical to, the code on the 'eBay' chip. I believe they perform similarly.

If anyone has other chips they'd like to have checked out, I'd be happy to take a peek at the code and do a little forensic analysis. Shoot me an email if you're interested.

 

[maw1124]

Re: FEELER: Any interest in 'performance' chips?

I only learned about the rev limiter on my way to another transmission, unfortunately. Messing around with the child safety switch FGS mod and ran straight through redline and my old transmission at the same time. Oh well, sh*t happens.

Yeah, the chip isn't marked -- I only know what it is from the car's history (oral and paper), etc. I've spoken to RennTech about it, and let's just say they seem to follow the AMG model of record keeping, which must have been vogue back then.

I may take you up on one of those chips by the way. I have two LH modules and can use to go without the cold start upshift delay (at least I think -- only one way to know). I'll email you if so.

Cheers,

maw

 

[500AMM]

Re: FEELER: Any interest in 'performance' chips?

I suspect RENNtech may have offered a few different chips over the years. I doubt there is anyone still working there who would remember what they were doing 20 years ago though. Likely will remain a mystery.

That said: Someone loaned me a chip in 2011 that was allegedly a 1993 RENNtech chip. However, there was no label or marking to indicate it was a genuine RENNtech item. Whatever the origin, after reviewing the code on the chip, it appeared the only change was removal of the top speed limiter. Nothing else. (!!!?) If anyone has a confirmed RENNtech chip, and is willing to loan it to me for a couple days, I can take a look at the code and see what is changed compared to stock. Maw, it's interesting that your '92 RENNtech chip seems to have increased rev limit, while the '93 RENNtech chip I borrowed had stock rev limit.

On a related note, a generous forum member loaned me a SuperChips chip around the same time as I tested the '93 RENNtech chip. SuperChips appeared to remove the top speed limiter and also increased rev limit to ~6600rpm, and I think also eliminated the cold upshift delay. The SuperChips code is similar to, but not identical to, the code on the 'eBay' chip. I believe they perform similarly.

If anyone has other chips they'd like to have checked out, I'd be happy to take a peek at the code and do a little forensic analysis. Shoot me an email if you're interested.

Dave,
It would be interesting to know what's done with the chip in my SuperMerc. AMG converted the car to E60 specs in 1994 and I suppose they installed the entire 6.0 engine management including the 6.0 LH-module; HWA 124 545 07 32, the Dyno print from AMG does at least show correct power. But the car doesn't have the 6.0 LH-module today, it has the regular 5.0 LH-module; 014 545 17 32, and I haven't managed to track the background for this. The supercharging was done in 1996, and per Walter König at König Specials they "reprogrammed the chip", without giving further details. They always reprogrammed the chip when supercharging M119 w/LH.

If you don't mind I could send you the entire LH-module so you can check & test it out. Could be good reference information to have here on the board in case someone goes for supercharging. Just Email me if you find it interesting, I'll cover the shipping BTW.


-a-

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

I only learned about the rev limiter on my way to another transmission, unfortunately. Messing around with the child safety switch FGS mod and ran straight through redline and my old transmission at the same time. Oh well, sh*t happens.

Assuming you are basing that on the dash tach... the car may or may not have an increased rev limit over stock. I found my one car had a tach that is pretty accurate at low/mid RPM (say, to ~3krpm) but near redline it becomes optimistic by around 5%... meaning that at stock rev limit of ~6200, the tach was showing 6500-6600rpm on the dial! Only way I knew was because I had an aftermarket digital AutoMeter tach added (for the launch light). This particular gauge had a white-face conversion by a PO, which may or may not have something to do with the discrepancy. At the increased rev limit (6600 per the AutoMeter), the dash tach is showing almost 7000. (!!)

On a related note: I found the stock rev limit rather harsh, meaning if you have the shift lever in "B" and let the car hit the limiter, it hits the wall abruptly at ±6200rpm. The modified/increased rev limit seems softer, the engine kind of just stops pulling as it hits the higher ±6700rpm limit with the modified chip. I don't know if this is due to the chip programming or not.

It would be interesting to know what's done with the chip in my SuperMerc. AMG converted the car to E60 specs in 1994 and I suppose they installed the entire 6.0 engine management including the 6.0 LH-module; HWA 124 545 07 32, the Dyno print from AMG does at least show correct power. But the car doesn't have the 6.0 LH-module today, it has the regular 5.0 LH-module; 014 545 17 32, and I haven't managed to track the background for this. The supercharging was done in 1996, and per Walter König at König Specials they "reprogrammed the chip", without giving further details. They always reprogrammed the chip when supercharging M119 w/LH.

The 014 545 17 32 is the later "WOT" module for the 1992 500E. Wonder why they swapped it out. I've always wondered if the original E60 module (HWA 124 545 07 32) had WOT enrichment or not. There was a claim of some 'special' E60 builds with >390hp, I always wondered if those just had a 6L "WOT" module installed to pick up a bonus 15hp or so... :?:

If you don't mind I could send you the entire LH-module so you can check & test it out. Could be good reference information to have here on the board in case someone goes for supercharging. Just Email me if you find it interesting, I'll cover the shipping BTW.

Sure, I'd be happy to check it out! I'm not sure how much I will be able to decipher the code, but I can give it a try. Shoot me an email and we can figure out the details...

 

[Campbelljj]

Re: FEELER: Any interest in 'performance' chips?

I'd like one. I'm curious, is the chip compatible with any year m119 e500e? I have a 94. I have the CEL issue with the up shift appearing. Will this chip eliminate that issue? Also can you post some pics up of the module, location, install, etc.

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

I'd like one. I'm curious, is the chip compatible with any year m119 e500e? I have a 94. I have the CEL issue with the up shift appearing. Will this chip eliminate that issue? Also can you post some pics up of the module, location, install, etc.

Yes, the chip will work on later E500E, including the 1994 model. However, if you are having a CEL issue, it may not cure the CEL. Which specific code are you getting? If you clear the code, does it come back after a few restarts?

Photos below show the CAN box under the hood (with yellow decal, "Battery in trunk"), then with the cover removed so you can see the modules, and finally the LH module opened up showing the naughty bits inside.

 

[Campbelljj]

Re: FEELER: Any interest in 'performance' chips?

Ok great. I have 26 on the CEL. It will clear for weeks and even months and then re-appear. I'll take a chipset when u get them ready. Let me know PayPal info. Thanks John.

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

Hi John, thanks for the interest - PM sent with more info.

 

[Campbelljj]

Re: FEELER: Any interest in 'performance' chips?

Thanks Dave. Pmt sent.

 

[doolar]

Re: FEELER: Any interest in 'performance' chips?

And it has left me absolutely speechless that the guy has sold literally hundreds, if not thousands, of these things over the past 10+ years... and nobody calls him out on the false claims. Why? Because they don't dyno their cars, to find out they've been snookered! I bought one years ago to see what it was, and left neutral feedback with the comment that there was no power gain on the dyno. He contacted me all upset, and referenced all the happy customers he has. But his marketing didn't change one bit. It's literally not possible to swap an EPROM in an LH module and get 10-15% power gain. Can't be done. (I'd love for someone to prove me wrong, but if they could, they'd have done it long ago and be rich.)

I also bought one of his 400E chips for our E420 (with 1992 400E LH module). Imagine my surprise when I found the chip was the same 500E chip, with a 400E label on it. Identical hex code! I returned it for a refund explaining that I wanted a 4.2L chip, not a 5.0L chip. He said he'd have to contact his source in Germany, who was on holiday at the time, and it would be a few weeks. Never heard back.

I'm pretty sure I could select the modifications out of the 500E program and create a custom 4.2L chip. But I had no need for it personally, I've been happy with a stock 92 400E LH module. And, I didn't think there would be any market for me to sell a proper/correct chip, competing against the other guy. I kinda feel bad for all the folks who buy a chip for their 4.2L engine and have no idea it's running with a 5.0 fuel curve. The 5.0 program will not make more power on a 4.2L engine, btw... and could possibly cause issues passing smog if you live in a strict area (LA, Sacramento, etc).

My issue exactly with the chip I got from this guy some years ago. My car wouldn't idle correctly with the chip, and ran kinda dodgy. I just assumed that it was a 5.0 chip. Never bothered...

I would love to get a 4.2 chip from you if you reconsider!

 

[Christian_K]

Re: FEELER: Any interest in 'performance' chips?

I can share my experience with the chip by the ebay seller.
I ordered a 1992 Chip for my original 1992 WOT enabled ECU back then just before i killed the first Engine in my 500E. The car did run good with the ebay chip, no side effects IIRC, not much different from stock. Shift points were still the same in "D" as they are controlled by our gearbox valve body. Its only revving higher then redline, if you limit the gearbox with the lever into a certain gear like in "2" or "3".
However i think to remember that idle sounded differently from exhaust with this chip, like if its running a bit richer at idle. This might btw. cure some rougher running issues at idle some people have.
Anyways, as i had the ground-strap issue (gearbox one was not proper connected, front smaller one melted), which lead to a short so that basically all injectors where close to open all the time, as soon as i switched ignition on, the car would NOT start with the ebay Chip, however it would start after like 10-20seconds crank after i put back in the stock chip. Yes it was running veeeeery bad then with the stock chip and broken module, however it did, while it would not so with the ebay chip.
Later i bought another 1991 module and car would start with the first turn of the key.
So this lead me to the conclusion that the ebay chip might richen up idle? Whats your take on that Dave?

 

[samiam44]

Re: FEELER: Any interest in 'performance' chips?

Got a before and after 92' dyno curves? I'm scurrilous on how 6600 rpm rev limit plays into things.


Michael

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

...it was running veeeeery bad then with the stock chip and broken module, however it did, while it would not so with the ebay chip. Later i bought another 1991 module and car would start with the first turn of the key.
So this lead me to the conclusion that the ebay chip might richen up idle? Whats your take on that Dave?

It's hard to say without testing the chip itself, to see if there was any damage (i.e., ESD/static discharge changing the code on the chip). I'm running this exact chip in all my 500's and there was zero change in idle quality. I don't believe it affects idle fueling at all. Passed the local smog / emissions tailpipe sniff test with flying colors, readings were near zero. If the chip messed with idle mixture, there's no way I'd be passing emissions testing by such a wide margin. I have a feeling you may have had several different problems that all combined. :?:

Got a before and after 92' dyno curves? I'm scurrilous on how 6600 rpm rev limit plays into things.

Good question. I'm not sure if I did any testing on a '92 module with stock chip vs modified chip (same day / same engine). I do have a coupe of dyno pulls with the chip where you can see the curve goes to 6600rpm. The curve continues to drop off from 6300-6600 at a similar slope, i.e. it doesn't drop like a rock, but it doesn't flatten out either. Again, the increased limit is primarily useful for track use, where you may need some extra RPM to avoid a shift just before braking (road course or autocross), or where you want to eliminate the possibility of hitting the limiter due to a lazy transmission upshift (drag racing / bracket racing). On the street, I doubt anyone would use the higher rev limit. Main perk for street use is ditching the cold upshift delay.

 

[Christian_K]

Re: FEELER: Any interest in 'performance' chips?

Dave, can i send you the chip? Slowmail shipping is only 3,20€ from germany. So you can take a look on it if its any different or if its damaged.
Would appreciate it very much. Thanks

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

Dave, can i send you the chip? Slowmail shipping is only 3,20€ from germany. So you can take a look on it if its any different or if its damaged.
Would appreciate it very much. Thanks

Sure, I'd love to check it out! Shoot me an email and I can give you my address.

 

[Campbelljj]

Re: FEELER: Any interest in 'performance' chips?

Installed Dave's chip today and it works great. No up shift delay which is great. Only drove it 20 miles ran perfect. Thanks Dave!

 

[jnes]

Re: FEELER: Any interest in 'performance' chips?

Gsxr, Just recieved the chip. Thanks a lot! I was amazed how good you have packed it! I'll let you know when I finally install the chip.

- jnes

 

[JC220]

Re: FEELER: Any interest in 'performance' chips?

I got my Eprom Chip installed today. Dave’s instructions were very clear and easy to follow. Nice easy install since the Eprom Chip only clicks into place (No soldering required).
Install on my spare ECU took less than 20 mins! This has to be the best value upgrade for any 124.036 – thanks again Dave. I made my own sticker so I don’t forget which ECU has the chip in it

 

[215mph98]

Re: FEELER: Any interest in 'performance' chips?

GSXR,

Email sent regarding interest in purchasing your chips for my 94.
looking forward to your reply.

Regards,
Ben

 

[gsxr]

Officially changing the thread from Feeler to For Sale. Original post updated with photos & stuff...

 

[gerryvz]

Will your chip transform my E500 into an E63 AMG?


Sent from my iPhone using Tapatalk

 

[gsxr]

Will your chip transform my E500 into an E63 AMG?

Only if the trunk badge is also replaced, at a small additional cost.

 

[Benz]

mail sent

 

[Dario]

I tried sending you PM but you are not accepting it. I need one chip for a 1993 500E with 1992 WOT ECU installed. PM me

 

[gsxr]

Ooops! Sorry about that - sent you a PM.

 

[stickyvicky]

EMAILED YOU, DAVE

 

[Matin]

Do you still have any chips left? If so, I'd like one please!

 

[gsxr]

Do you still have any chips left? If so, I'd like one please!

Hello Matin, yes, I do have them available. Shoot me an email or PM... thanks!

 

[r44raven]

Email sent!

Stephen

 

[Matin]

Email sent too!

Matin

 

[gsxr]

Thanks, guys! Emails received and replied to.

 

[Matin]

Got my chip, installed perfectly, only took like 20 minutes, just need to be careful with the electronic ribbon.

Thanks Dave!!

 

[gsxr]

Got my chip, installed perfectly, only took like 20 minutes, just need to be careful with the electronic ribbon. Thanks Dave!!

You're welcome, Matin! Glad to hear it arrived sooner than expected.

 

[Matin]

In all honestly, I feel there is a little more power when you're at like 70-100 and you want to push it...probably just me believing that its doing something, lol.

Eitherway pleased with it.

 

[036]

Re: FEELER: Any interest in 'performance' chips?

If someone would just measure 0 to 60 and 60 to 100 etc. with and without chip?

 

[gsxr]

Re: FEELER: Any interest in 'performance' chips?

If someone would just measure 0 to 60 and 60 to 100 etc. with and without chip?

The differences would be so small, it would be difficult to determine... variations could be due to coolant/oil/trans temp between runs, wind direction, etc. I was able to get good data at the dyno and dragstrip though. Stopwatch via speedometer would be almost useless, but a good datalogger from Race Technology or Vbox may provide useful data over repeated tests on the same stretch of road.