Weird Bucking and Backfire. Log inside

[johnny boy 93]

Ok Guys. So I am in the middle of tuning my car and finally putting the finishing touches on it for the setup I want to run, but now I have encountered more issues then even before. So my setup is in my profile but here it is:

Front Mount
MBC
16g
DSMlink
Evo injectors
255 fuel pump
FPR

So here's my issues. As around 5000 rpm even out of boost my car gets a wicked backfire and a hesitation. I have no clue what it is. My pump turns on and gives fuel pressure, my regulator I have tested for 30 psi and it goes up one psi for every pound of boost so I'm stuck.

At WOT the hesitation doesnt come till around that 6000 mark, but then its worse.

Here are my logs for both WOT and just a short cruise, but the only thing i noticed was on the WOT log even though I know my foot is to the floor at 6000+ rpm all of a sudden in the log it says my throttle positioning is 0%. Could that cause this?

Thanks guys

 

[twdorris]

I'd have to start by asking why the fuel sliders are jacked up so high at 5000+ RPM. The stock fuel map runs around 9.5:1. With +30% compensation, you're probably running closer to 7.3:1 and completely flooding the engine if I had to guess.

Do you have any logs before you changed the fuel sliders all around?

And would you consider downloading and using the V3 laptop application off our website? It works with older V1 and V2 ECUs just fine, but it's much nicer for reviewing datalogs.

Thomas Dorris
ECMTuning, Inc.

 

[johnny boy 93]

Ok here is an adjusted log with different timing and such. They are in V3 as well. I finally got it to work. Suggestions?

 

[twdorris]

I'd still ask why the RPM fuel adjustments are so positive above 5000 RPM. If everything is working properly, nobody should be running richer than stock...

What happens if you just zero out (or go slightly negative) on the fuel adjustments from 5000 to 8000 RPM?

Thomas Dorris