Here is the situation, with the stock settings, my car boost to like 16-to-14 psi and then drops to 7-to-8 psi.. I checked all the hoses and re-tigh the clamps. When I'm aceleration I can hear the car boosting and suddenly the boost drops to 7psi till settling at around 8psi...
So I want to know if any one here had experience that problem and how to solve it.

One other thing, before installing anything to the car I dynoed (to have a baseline) and I was only able to get 187-AWHP.. sad I know, and I still don't know what's wrong with my car..

Please help..!!!

Miguel
mapaulino@gmail.com

 

You're boosting 116PSI? My god I hope not

 

The only reason I could see your boost tapering that low is a boost leak. If I run my car on the wastegate spring without any boost controller the lowest my boost ever gets is 12 psi. You might want to do a pressure test on the intake system.

-Paul

 

There's more like 100 reasons that your boost could be that low, is it an '03? If so, take it to the dealer, and tell them you're having boost problems and to do the test that Mitsu recently released on malfunctioning wastegate actuators... the next thing could be an internal problem with the boost solenoid, I was having a similar problem, but it was boosting 16 and holding just fine... an MBC solved that just fine, hits ~20 and tapers down to ~17-18.... But, seeing you have a boost controller already set up, then that might not be the problem.

 

Sorry for the typo...

So, I think I have to schedule a visit to the Mitsu dealer. Just what I expected..!!!

Thanks,

 

Take it easy - you'll be fine

 

It has to be something with your Greddy Profec-B... i am not too familiar with that unit.. but if you have the boost controller on the car then that would seem to be the problem... Sadly the dealer (at least the ones around here) won't touch your car to fix a boost problem if you have an aftermarket boost controller.... however.. I would look up the how to for the greddy profec b and make sure everything is hooked up right.. I do remember people have problems with the "3 caps" that are on the boost controller, and I remember reading about similiar situations like the one you are in and they centered around those caps... Youll be fine... I really think its something on the Boost controller... search for Greddy-Profec B install and you should have the threads you need.. take care.. best of luck
-Ric

 

I disconnected the boost controller and the problem still there, so, the BC is NOT the problem.. With the BC I had some spikes issues, now without it I don't have the spikes but the boost still drops to some rediculous levels..!!!

Thanks for posting.

Miguel

 

Please post your dyno sheet.

 

Man, that's horrible and embarassing... why you want to see that..?

 

LOL, hope you fix the problem.