Pressurized

Okay, so now it's like 30 degrees here and witht the windchill it's like 15 outside. I just got back from taking my car for a ride trying to diagnose when and where my boost spike occurs and check out what happened!

On the highway, opened it up slowly in 3rd gear all the way to WOT.....the boost guauge climbed really quick....


13-13---------18!!!!!!!!!!! AHHHHHHHHHH! 18psi! Oh my god, I'm surprised my car didn't scatter itself all over the road, I really hope that my boost guage is busted, or for some reason my turbo's and engine are ungodly powerful!

kwikrx7

Ouch - you won't get away with many more of those! MPs are hard to contol boost - especially in the cold air. You can usually tune it out with a Power FC but a cold day is risky at WOT with a MP. I've heard pop-off valves help with contolling boost with when having problems

Pressurized

Pop-off valve? I've seen those they're relatively cheap, how do they work? Or do they at all?

jr

Their sort of a "last line of defense" against boost spikes. They are set at a certain PSI and pop open when boost exceeds that amount bleeding the boost off dramatically. However they are just for safety and should not be used to control boost, when they bleed off if you don't get off the throttle you can over spin the turbos.

Tommy

18psi!?!? dude, send me an email....we'll hook up and find a solution for your boost problems. i have a garage and my roomate has lots and lots of tools

TYSON

CART (Champ, Indy, whatever it is now), uses a pop off valve to limit the boost on everyone's car to the allowed limit in the series. I seem to remember that being 55 PSI at one time. Mounts between the turbo and the throttle body. Summit Racing has them, I think.