Guys just wondering wot is the purpose of taking the pressure relief valve of a vlt inlet manifold then blocking up that hole were it was? Also is it illegal to do so ?? Thanks guys

Cos anything upto like ~9psi or so will open up the valve and vent boost, it was put there as a saftey from factory anything ova 9psi it will open so you dont blow ya motor, and when it opens trust me you know about it ya car bogs down, people take them off or weld them to be able to run more boost without it venting anything past ~8-9psi, it is not epa legal to have it welded or taken out, neither is boost controllers.

thanks mate ur a champ...so itll hold boost if its welded? If i leave the valve can i run 10-12psi without any dramas? If no what r the dramas?

Quote: Originally Posted by Vl^Turbro thanks mate ur a champ...so itll hold boost if its welded? If i leave the valve can i run 10-12psi without any dramas? If no what r the dramas? No you can't run that much boost without modifying/replacing it. It is originally designed as a safety mechanism for the off chance that the stock wastegate fails (eg. hose falls off, gate jams shut, etc.) and you get a huge boost spike. Stock boost = 6psi, overboost valve opens at a bit more than that, say 9psi. This protects the engine and stops it from eating a piston if something goes wrong. If you want to run 12psi, that is substantially more than factory boost and so you will have to do something about the overboost valve.

take it out, add a shim to the spring to increase it's rate. varying the height of the shim will increase the boost level at which it begins to vent. you can muck around with it until you get it say 2psi above what you want to run. eg want to run 12psi, gradually add shims to the spring until it holds boost till 14psi then begins to vent. when it opens, you'll know all about it as it will make lots of noise and your car will bog down as the AFM reads lots of air going into the engine and fuels accordingly, while a whole bunch of this air is in fact NOT going into the engine. hence, rich running and dodgyness all over.

sorry to butt in , so can u leave a weilded one in if your running stock boost? with no effects to the car?

If you are running stock boost, there is no need to weld it up...

aah k thanks guys ill run 9 or 10 psi and see how i guy.. thanks for your help every1

Any one know where u can buy like a 14psi or bigger valve to replace the stock one ?, id rather that for insurance then welding it up.

just block it up with a plug. 1" bung. **** insurance, you dont need insurance as long as your turbo hoses are good. I dont think many people have had their wastegate fail or a hose burst.

If you like try an ET turbo valve, I herd there rated at 14psi but not %100

If anyone is selling there factory release valve i'm after one...PM me when your ready Some original photos have not been recovered yet.

sounds like the kind of thing you'd want to have working... if it's just a matter of shimming a spring to get it right I don't know why you wouldn't bother...

i have a factory relief valve will sell for $50

hit a welsch plug in epa cant even tell its blocked, and your gonna know if your waste gate jams or your hoses splits cause your gonna notice the difference between say 9 and 15 pound.