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Message: <blockquote data-quote="[PIMPIN]" data-source="post: 4495167" data-attributes="member: 2994">Blow-off valves usually if you tighten basically you're limiting the amount of air vented. I used to do it myself but that was a GFB blow-off valve. Past 3-4 years I've used HKS but I've never had a reason to even fiddle with it. There are two types of Type II; don't ask me why but the one you posted came out just months after I got mine.If there is a leak say blow-off valve anywhere along the piping; wouldn't you notice boost build-up?If you take your car back to your original tuner; before he runs it on the dyno he will of course check the car to make sure that everything runs fine and there is nothing faulty. Only then would he put the car on the dyno and if he breaks it on the dyno then its not your problem. The way I see it, if you want to run an external venting blow-off valve, find out what's preventing you from doing so because countless others have no problems. If you recirculate and the problem goes away that means you are ignoring or covering up a problem because with your setup, you shouldn't have to make this compromise.At the very least try tighten it first before spending more money on new blow-off valves or recirculating fittings.---------- Post added at 07:11 PM ---------- 6 hour anti-bump limit - Previous post was at 07:05 PM ----------What he says is correct. If you tighten the blow-off valve to the point that there is no where for the air to escape (remember blow-off valve opens when you take your foot off accelerator therefore the butterfly valve on your throttle body is closed) so it goes back the way it came; unfortunately causing compressor surge which is when your turbo which spins at insane speeds is suddenly forced to spin backwards. Not healthy.</blockquote>

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