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The Terminator
Engine/Tuning
FRPP 80lb injector tuning problems
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<blockquote data-quote="WDW MKR" data-source="post: 9987020" data-attributes="member: 8038"><p>FRPP 80lb injectors with latest SCT value file and 60psig base pressure. Running E85 with base stoick of 9.85. I scaled breakpoint, hi-slope and low-slope to match my existing tune.</p><p></p><p>It's gotta be something simple, but these things are kicking my ass. The car has run like crap since I installed them on Friday. I loaded the new tune, fired the car, then tried to keep it running while datalogging. The wideband showed lean, so I loaded a new tune with more fuel without much change. I then loaded a tune with less tune, based on the STFT showing rich when I'd hold the throttle up a bit past idle. That wouldn't even start the car. I went back to the other tune and took the car around the block. It took a lot of finesse to roll away from a stop without bucking all over the place and it didn't drive very smooth.</p><p></p><p>I built a new tune from scratch, loaded all of my typical personal and SCT value files, scaled appropriately and tried again. It ran better, but still the same deal of showing lean until it goes closed loop. The other problem is STFT1 and STFT2 showing a ~20% gap that wasn't there before. STFT1 would show near stoich while STFT2 was very lean. I swapped in a spare sensor and nothing changed. I then installed new Bosch sensors (yes, I know they're junk... no other option for troubleshooting on a Sunday) for both banks. This seemed to be the fix as both sensors took off and pegged lean. However, as they settled out, STFT2 was the first to come off 0.75 and float in the 0.80's. STFT1 then followed and went back to running near stoich. When I load a tune with ~10% more fuel, STFT2 then runs near stoich and STFT1 is in the 1.20s. This trend isn't always clean, but it's definitely a trend. The wideband matches the lean condition when STFT2 is showing it (wideband sensor in the driver side pipe).</p><p></p><p>It almost seems like I have an injector that's not firing or some other bank-specific issue. They are brand new FRPP units. I've unhooked and reconnected the harness without any change. I've eliminated the MAFia with no change (previously hooked up but set at "0"). I've tried different O2 sensors. I've verified harness connections at the MAF, IAC, TPS, FRPS, etc. I've tried a few different tuning strategies.</p><p></p><p>My previous combo was 75lb injectors with 93oct at stock base pressure and I didn't have any of these issues.</p><p></p><p>HELP!!</p></blockquote><p></p>
[QUOTE="WDW MKR, post: 9987020, member: 8038"] FRPP 80lb injectors with latest SCT value file and 60psig base pressure. Running E85 with base stoick of 9.85. I scaled breakpoint, hi-slope and low-slope to match my existing tune. It's gotta be something simple, but these things are kicking my ass. The car has run like crap since I installed them on Friday. I loaded the new tune, fired the car, then tried to keep it running while datalogging. The wideband showed lean, so I loaded a new tune with more fuel without much change. I then loaded a tune with less tune, based on the STFT showing rich when I'd hold the throttle up a bit past idle. That wouldn't even start the car. I went back to the other tune and took the car around the block. It took a lot of finesse to roll away from a stop without bucking all over the place and it didn't drive very smooth. I built a new tune from scratch, loaded all of my typical personal and SCT value files, scaled appropriately and tried again. It ran better, but still the same deal of showing lean until it goes closed loop. The other problem is STFT1 and STFT2 showing a ~20% gap that wasn't there before. STFT1 would show near stoich while STFT2 was very lean. I swapped in a spare sensor and nothing changed. I then installed new Bosch sensors (yes, I know they're junk... no other option for troubleshooting on a Sunday) for both banks. This seemed to be the fix as both sensors took off and pegged lean. However, as they settled out, STFT2 was the first to come off 0.75 and float in the 0.80's. STFT1 then followed and went back to running near stoich. When I load a tune with ~10% more fuel, STFT2 then runs near stoich and STFT1 is in the 1.20s. This trend isn't always clean, but it's definitely a trend. The wideband matches the lean condition when STFT2 is showing it (wideband sensor in the driver side pipe). It almost seems like I have an injector that's not firing or some other bank-specific issue. They are brand new FRPP units. I've unhooked and reconnected the harness without any change. I've eliminated the MAFia with no change (previously hooked up but set at "0"). I've tried different O2 sensors. I've verified harness connections at the MAF, IAC, TPS, FRPS, etc. I've tried a few different tuning strategies. My previous combo was 75lb injectors with 93oct at stock base pressure and I didn't have any of these issues. HELP!! [/QUOTE]
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