Desoot mode lean spike after 2 seconds in PE 2007 silverado e38 2bar

[gregnkidd]

I have searched high and low for a answer without much luck. I have seen older posts that describe my issue of a lean spike after 2seconds of being in PE. But am under the impression that Since i have a early 2007 e38 silverado that the desoot option is not available. what was the best work around for this problem? i submitted a help ticket with hptuners to see if it is something that can still be added to my operating system.
My setup is a 2007 new body silverado 4.8l lsa supercharger running with maf and VE dialed in with a 4l80e. i have already zeroed prediction coefficient in a effort to fix the problem also.

Any insight would be greatly appreciated

Greg

[gregnkidd]

here is a log with a few boost roll ins to see the issue

[gregnkidd]

screenshot of one of the times of issue if you dont want to scroll through the log

[07GTS]

my early e38 dosnt have the enable/disable for the desoot but i get the temp threshold to just max out, does your have that in the current beta version ?

[gregnkidd]

I will check the beta when I get home, I did not see anything that jumped out as a solution though. In case I missed it what is the temp threshold your referring to?

[edcmat-l1]

Not sure of the cause since you don't want to share you tune file but I wouldn't be concerned about that little blip @ 112 Kpa. I wouldn't be targeting .78 at that point either.

[gregnkidd]

Fair enough, I will get a copy uploaded this evening, the lower kpa areas don't worry me it is the fact it seems to do it at all boost regions up to 170kpa

[Alvin]

There are things I see that are a much bigger problem than what you think is going on.

The fuel trims are constantly rich and the target AFR is pretty damn rich even at low boost.

[edcmat-l1]

There are things I see that are a much bigger problem than what you think is going on.

The fuel trims are constantly rich and the target AFR is pretty damn rich even at low boost.

Agree. Didn't look through the log just at the screen shot. But that was enough.

[gregnkidd]

Here is a copy of the Tune file

[edcmat-l1]

Untitled.jpg

That's your trims plotted in VE.

I'd put all the injector data back to stock except the ID data. Including the stuff that's changed under the transient tab. Put it in speed density and dial it in. Then see what it does.

This is another case of too much stuff is changed that probably shouldn't be.

[gregnkidd]

Untitled.jpg

That's your trims plotted in VE.

I'd put all the injector data back to stock except the ID data. Including the stuff that's changed under the transient tab. Put it in speed density and dial it in. Then see what it does.

This is another case of too much stuff is changed that probably shouldn't be.

I am sure you are probably right, I tried putting the transient stuff back to stock vs the zl1 data with no result. I will try it sd again and confirm if it is still there

[edcmat-l1]

I am sure you are probably right, I tried putting the transient stuff back to stock vs the zl1 data with no result. I will try it sd again and confirm if it is still there

Not just the transient stuff. ALL of the data except the data provided for the injectors.