Quote:
Originally Posted by serialk11r
The ECU doesn't know that half the cylinders are getting more air than the other half most likely, and if it injects not enough fuel into half the cylinders and too much into the other half, something will break pretty fast. If you have 2 O2 sensors, one per bank, you might be in slightly better shape in terms of fueling, but there are still a million other things that could go wrong.
EDIT: oh you want to hook the exhaust to one bank only. That's bad too, because the back pressure will cause less air to go into those cylinders and the same problems will occur. High likelihood of detonation.
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I appreciate the input but I am going to have respectfully disagree with you. The slightly higher back pressure will slightly hurt exhaust scavenging I agree, so a little less air will mean a little richer AFR on that bank. Most modern EFI systems have no problem correcting up to +/- 20% fueling adjustment before a lean or rich code is triggered, and we are talking about single digit % changes to AFR here. It may run slightly rich when forced into open loop during high throttle situations, but running a little rich will help with detonation, not hurt, and who knows maybe a little extra exhaust in the chamber will have an erg like effect to bring down combustion temps, further hindering detonation. All in theory of course.
That being said I believe the keyword in that last paragraph is slight because I think the effect of turbo backpressure on one bank is so small at the boost levels I'm looking at(5-6psi.) its not going to matter at all.
As for detonation, if it were going to occur at that boost level, it will not because I am going to use water injection. I have used it extensively over several years and it does amazing things, I have used it in the past several years and have ran over twice as much boost on an engine with a little higher compression, stock timing, no intercooler, pump gas and properly setup WI system. key is to get a large reservoir.