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Old 05-27-2013, 08:22 PM   #51
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Location: Tuning 8/9sec Subies all over
10.8 XT+9.2@155 GR+
9.1/157mph 2015 STI


Originally Posted by reid-o View Post

Are you running pull through with a maf? It could be the air reversing direction out through the intake which is the opposite effect of the car stalling if dumping to atmosphere.

Crawford uses small diameter hot piping which likely has the bulk of effect on response than the bov delete.

I don't have an opinion on sans blow off valve, but theoretically it would reduce response between shifts in average every day driving because the compressor is coming to an abrupt halt or at least suddenly decelerating. This would be most apparent in spirited non race conditions where the throttle is allowed to close significantly even for a brief period like getting on a freeway. would think the best response in these conditions would be to keep the compressor from decelerating without having to keep the throttle open. It would make sense to me that drift cars etc.. gymkhana rarely allow the throttle to suddenly go back to idle position but they likely modulate the throttle between 60-90 very frequently for long periods and so a blow off valve if not sprung perfectly might blow off every so often with a sudden depression of the throttle and the car would lose torque and wheelspin. Even though the throttle never closes the sharp deltas might have a strange effect on the bov. In this context it makes sense to run sans bov.
Great post

Bov delete on a street car is dumb. Good turbo or not, it stalls the compressor in anything short of a drag race.

Race car with an auto or dedicated drag car sure... Works great and one less thing to leak.
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