Re: Lean Misfires at 2700-2800 rpm
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Originally Posted by mehlosTT
Just how lean or rich are those O2's when you think it's spark blow out? What are the AFRs exactly?
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Just before the blowout starts, my O2's are @ 0.91V and my AFR is @ 11.0. When the blowout starts my rear bank O2 voltage drops rapidly to 0.60V whereas the front bank voltage stays @ 0.91V. If I try throwing more fuel at the problem, the problem only gets worse.
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Originally Posted by mehlosTT
The 'bouncing timing you see, are you positive it is not just the ecu pulling timing when knock is coming on?
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I'm positive. I have a 1st gen, so I can see knock and there is no knock while the timing is jumping around/osciliatting +/- 1 or 2 degrees (during the blow out). The knock usually only comes on after a few seconds of rear bank readings of 0.60V and I suspect that it is because the blowout leaves a loaded cylinder.
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Originally Posted by mehlosTT
And what the heck is "TurboBob ecu"?
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A TurboBob ecu is an ECU that has been socketed (by TurboBob), so that it can accept different speeds of crystals. By using different speeds of crystals, you can "overclock" your ECU, which allows you to raise your redline limiter. I had this issue before I overclocked my ECU, so I can say with confidence that the overclock did not cause my problem.
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'91 VR4 - Modlist: DR650R turbos, Snow stage 2D alky kit, DSM SMICs, blowthrough ported LT1 MAS, Dejon Tool intakes & y-pipe, Blitz DSBC Spec R, HKS SSQV BOV, PTE 580cc injectors, Dual feed fuel system with Aeromotive FPR & filter, Hotwired Supra pump, ek2mfg plenum spacer, HKS DLI, MSD Wires, Apex'i S-AFC II, MAFTranslator, Turbobob ECU, Scanmaster III, LC-1 WBO2, ESP downpipe, Vac/EGR delete, Gutted precats and test pipe, Maximal solid mounts, 300m 18 spline output shaft, Centerforce Dual Friction clutch, RPS flywheel, GC coilover conversions with helper springs, Powerslot slotted rotors, Goodridge SS brake lines, Hawk pads (front), Stillen metal matrix pads (rear)
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