So i built this car up specifically to go race it. Been solid last year and this year up til last week. Made a pass and the line blew off the frps. No biggie, put it on and zip tie right? Well the fueling hasnt been right since. Lean on the top at wot and also goofy at idle. Otherwise, car runs fine, no miss, just a hesitation when you stab it at idle, wideband goes lean then comes back to stioch.
Im looking at the data and see KAMRF values are 1.1-1.08 at idle... so here is my question, I may have this backwards.
It's read in lambda, so anything above 1 is lean. Since it's a learned value over time does this mean it's removing fuel?
Logically I can't convince myself that the issue is tune related since it had been perfect at wot. Seems like a part failure.
I swapped the frps out with the one off my other car which runs perfectly fine and it made no change.
Looked extensively for vac leaks everywhere else there is vacuum.
No egr on the car
New maf of same brand and size. I would expect this to have to be tweaked a little due to variance in sensors but it made no change telling me its not there.
Stuck a new wideband sensor in just to verify there's not something wrong with it.
So far, I'm not coming up with a part failure. The one far fetched option I can think of yet to try is upstream O2's..
I did add a N2MB wot box this year and wondered if the pop during no lift shifting may have damaged them? Doesn't seem likely.
Waiting on a reply from the tuner, but I see he's been MIA for a bit. Really driving me nuts, and I just missed a points race so I need to resolve it soon.
Anyway, I'll list some details on the build for context. Damn thing surprised me for what it is. Runs pretty hard for a little blower.
• Cast iron block, .020 over
• 9.5:1 diamond pistons
• Stock 03 rods
• Stock 03 crank
• DB heads
• 2.0 Kenne Bell w/ 15-16 psi pulley..verified by KB, 420 serial number. (I got up close and personal with this thing, rebuilt myself with a little expert help.)
• ID 1000 injectors, stock rail
• BA 3000 maf, JLT Cai
• Returnless with twin 340 E85 AEM pumps in the stock hat. Dual fpdm with wire upgrade.
• Longtubes
• Stock ecu with quarterhorse
Full interior, minus the stock seats, went 6.82@103.. ran a best of 6.79 stripped down and a pass at 104 before this dilemma.
If you have any suggestions, I would love to hear them. I can even send a log if anyone's willing to take a look.
Have a good day gentlemen
Im looking at the data and see KAMRF values are 1.1-1.08 at idle... so here is my question, I may have this backwards.
It's read in lambda, so anything above 1 is lean. Since it's a learned value over time does this mean it's removing fuel?
Logically I can't convince myself that the issue is tune related since it had been perfect at wot. Seems like a part failure.
I swapped the frps out with the one off my other car which runs perfectly fine and it made no change.
Looked extensively for vac leaks everywhere else there is vacuum.
No egr on the car
New maf of same brand and size. I would expect this to have to be tweaked a little due to variance in sensors but it made no change telling me its not there.
Stuck a new wideband sensor in just to verify there's not something wrong with it.
So far, I'm not coming up with a part failure. The one far fetched option I can think of yet to try is upstream O2's..
I did add a N2MB wot box this year and wondered if the pop during no lift shifting may have damaged them? Doesn't seem likely.
Waiting on a reply from the tuner, but I see he's been MIA for a bit. Really driving me nuts, and I just missed a points race so I need to resolve it soon.
Anyway, I'll list some details on the build for context. Damn thing surprised me for what it is. Runs pretty hard for a little blower.
• Cast iron block, .020 over
• 9.5:1 diamond pistons
• Stock 03 rods
• Stock 03 crank
• DB heads
• 2.0 Kenne Bell w/ 15-16 psi pulley..verified by KB, 420 serial number. (I got up close and personal with this thing, rebuilt myself with a little expert help.)
• ID 1000 injectors, stock rail
• BA 3000 maf, JLT Cai
• Returnless with twin 340 E85 AEM pumps in the stock hat. Dual fpdm with wire upgrade.
• Longtubes
• Stock ecu with quarterhorse
Full interior, minus the stock seats, went 6.82@103.. ran a best of 6.79 stripped down and a pass at 104 before this dilemma.
If you have any suggestions, I would love to hear them. I can even send a log if anyone's willing to take a look.
Have a good day gentlemen