This is a discussion on "The BIG BOV thread" (Where all bov question threads get merged) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by DSMKilla Did a search, couldn't quite find anything as to what I'm looking for. My question: I'm ...
As for a serious and helpful reply
No, they will actually reduce performance. When you let off the gas, and the blow off valve "blows off" into the air to make that noise, that air was already measured by the engine computer, and the computer has already made the proper adjustments to the fuel, timing, etc... to properly use that amount of air. However, you just let that air release into the atmosphere...now what does the engine do? It has all this fuel, and no air to burn it with.
People have had issues from stalling, to O2 sensor fouling, to afterfire and bad MPG when they do this.
Of course, some people have no problems at all. A buddy of mine has a HKS SSQV installed, and it does sound "mean as hell" but to this date I have only seen him stall once from a light, and otherwise his milage and exhaust\engine seems OK.
Its up to you. Is it worth the risk of engine or exhaust damage? From a performance standpoint, maybe there is an advantage to an aftermaket bypass valve or a adjustable blow off valve that lets you vent 100% back into the intake instead of the atmosphere. Some people say they vent quicker, are more efficient...etc... but almost everyone agrees blow off valves that vent to atmosphere are useless, and make your car perform worse
Yeah, I f-cked up. Missed the thread.
Go ahead. Say it.
Yeah, I deserved it.
But I got my answer, and I learned my lesson.