Some last myths to bust...

[Christian_K]

I'm opening that topic to have some discussion about some last myths to bust on our cars. The final findings will then be posted into the WIKI.

- WOT-Signal only at kickdown. Those of you who have Digital scanner/HHT/Star-Diagnosis can see that there is a certain live-data called something like "WOT (Full Load recognition)" or "WOT Switch" and this is according to my testings of 3 W124 M119 V8 powered cars, only listed as "ON" or "activated" when you are pressing the pedal down to the kick-down switch. It doesn't matter how you set the throttle-linkage. Why is that? And what does that mean to power-development?
Picture:

- Throttle-Flap does not open fully 90° despite you having you foot pressed fully down on the gaspedal. Have only tested it with ignition-on so far, might be some sort of security-thingy (but then why?). Another reason might be that its designed that way so that each intak-runner in the Manifold gets the same amount of air, since even when closed it is at a certain angle.
Also proven in this Video about ETA wiring repairs (starting at 5:00!)
[video=youtube;Ci8fz62O8ew]http://www.youtube.com/watch?v=Ci8fz62O8ew[/video]

- WOT-Enrichment LH based on fixed fuel-mapping or "altered" by the self-adaption values?
Busted by Daves torough Dyno testings! WOT-enrichment is based on the fuel-mapping BUT uses the self-adaption values aswell.

 

[Taxi Driver]

Hi Christian, coincidently I just stumbled over that and other clips about the ETA rebuild. I also wonder when WOT
takes place, it did not on the video, there were some few degrees from 90* fully open. It also struck me, maybe that part of the *harness* is overlooked when many have to change the upper one and also that it's not necessary to change the ETA?

 

[Christian_K]

I also wonder when WOT
takes place, it did not on the video, there were some few degrees from 90* fully open.

Its not even clarified what conditions on our cars have to be met for WOT to takes place. Thats the Problem. According to live-data from digital-scanner you have to press kickdown for WOT. But will this "WOT condition" open the Flap even further? I don't know.
The guy from the Video, which rebuilds the ETAs, said in his comments that it was WOT when he pulls the lever fully to the left end. Thats need to be tested/clarified though.

It also struck me, maybe that part of the *harness* is overlooked when many have to change the upper one and also that it's not necessary to change the ETA?

The ETAs wiring is not part of the upper, nor of the lower engine wiring harness. It has its own harness and connector like you can see in the video.
But before this goes offtopic again, i would encourage you, if you have further ETA-Rebuild/ETA-Harness questions to open a new thread/topic about it.

 

[gsxr]

While the computer does not indicate WOT recognition until kickdown is pressed, the only way to verify if the mixture goes open loop (WOT enrichment on '92 modules) is to monitor the O2 sensor voltage while driving under load. I'll have to test that out sometime. The throttle flap angle may still be fully open - need to look into that as well.

 

[Taxi Driver]

The ETAs wiring is not part of the upper, nor of the lower engine wiring harness. It has its own harness and connector like you can see in the video.
But before this goes offtopic again, i would encourage you, if you have further ETA-Rebuild/ETA-Harness questions to open a new thread/topic about it.

Yes I know that, the reflection was, it may be overlookt as it seems, as it has it's own connection to the e-gas module.
Speaking of whitch, the E-gas may have to have more info than just the throttle position, load, roadspeed, engine revs. and so on to do the WOT and in the early LH the fuel enrichment?

 

[Christian_K]

While the computer does not indicate WOT recognition until kickdown is pressed, the only way to verify if the mixture goes open loop (WOT enrichment on '92 modules) is to monitor the O2 sensor voltage while driving under load. I'll have to test that out sometime. The throttle flap angle may still be fully open - need to look into that as well.

Yes, but the funny thing is, this certain live-data "WOT (Full Load recognition)" gets also switched to "on" when you do it on a car without WOT-enrichment. This somehow confuses me as this could mean different things:
1. WOT-Enrichment/Open-Loop on car with WOT-Enrichment, is only activated when pressed kickdown
2. Function/Effect unknown and Open-Loop is activated already much earlier (probably 1/2 to 3/4 pedal-way)
3. Throttle-Flap 90° Open only when kickdown pressed
4. Combinations of the above...

I hope we can bust those myths soon. I think on the one hand, the throttle-flap thingy should be tested with the engine running and Airfilter-Box removed, so i can't unfortunately -.- But on the other Hand with engine-running you have a ~4000RPM Rev-Limiter. Hmmm.....

 

[gsxr]

Check out "Throttle Valve Angle" in the LH live data.

 

[Christian_K]

Check out "Throttle Valve Angle" in the LH live data.

I did... But i don't know if this is accurate, was at the E420 without ASR with that crazy surging idle..
At full-throttle (no kickdown) it showed "66.5°" - "WOT recognition" set "off" - and on Kickdown it showed "80.1°" this time with the "WOT recognition" set to "on". At Full-throttle and Kickdown the linkage was bot at the very End for full-load on the ETAs side. So... i don't know really what to think about all this..