Best activation of PE mode

[oztracktuning]

I am curious about what people are finding is the best settings to get PE mode activated with the E38s. I want it to enrich at low rpm when the map goes above 80Kpa. But so far im finding that its difficult to get the balance right between throttle % and kpa. Its easy to get it to come on too late and i want to squeeze more timing in than 14.6AFR can support down around 1600 to 2400rpm

[4wheelin]

I Have the same problem with an L76 I put in a GU Partol and 4L80e, I sent the file to support but havent heard back. As far as I could see it should be going into P.E. but won't under 80kpa and 3000 rpm. I had a miss under this load at 14.7 and had to command a downshift to avoid it. Support agreed it should be going into P.E. sooner.

[Black02SS]

Same here. The problem I am seeing is I can put 35% for the TPA% I want, but it still doesn't kick the car into PE.

[ringram]

Maybe it has to trigger both, not just either?

[oztracktuning]

Thats right it does need both. But its a the best combo of both thats tricky to find.

[ringram]

I used to trigger solely on MAP. Set TPS very low and there you go
After all the engine isnt under load until then anyway. That would be my approach fwiw.

[swingtan]

Hi all,
I've been looking at PE in the E38 PCM for a few days now. From what I've found, it seems that EFILive is still using the old LS1 TPS readings in an attempt to control PE mode. This results in the EFILive software settings not actually triggering PE mode when it indicates.

So far I've played with a number of setting for PE TP% ranging from 6% up to 30% ( all other settings unchanged ) and logged a number of runs at each setting. This is what I've come up with so far for TP% and PE Mode.

EFILive - Logged

06% - 33.3%
08% - 38.0%
12% - 41.8%
14% - 45.1%
16% - 47.2%
18% - 49.6%
22% - 52.8%
30% - 61.7%

I've graphed the results and placed a Logarithmic trend line against it and it's a very close match to the measured / logged values.

Another thing I've noticed is that PE sometimes comes in earlier than the figures above, particularly on fast throttle transitions. I wonder if the E38 detects quick throttle openings and predicts the requirement for PE, starting it off sooner.

So if you still want to use TPS%, then you need to allow for the difference in the software values vs what you get in the real world.


Simon.

[GMPX]

Another thing I've noticed is that PE sometimes comes in earlier than the figures above, particularly on fast throttle transitions. I wonder if the E38 detects quick throttle openings and predicts the requirement for PE, starting it off sooner.

Simon, I think there is a TPS change rate adjustment to the PE tables, we are looking in to it.

Cheers,
Ross

[swingtan]

Thanks, I thought that was there. I just wasn't sure if was a delay in the logging that gave the impression that PE was coming in sooner or if it really was a TPS% rate change setting as well. These E38 PCM's are pretty smart!

Simon.

[oztracktuning]

Which TP% did you log Simon?