I seem to be having problems with my boost.

The problem appears to be in 1,2, and 3 gear...4th and 5th seem ok. I am able to get 1.4 (20.58 psi) bar spike and hold in 4th and 5th gear all the way to red line. However in 3rd the best I can get is 1.3 (19.11 psi) bar and then drop a little around the 6000 mark. 2nd gear is like spike at 1.3 but drop to 1.2 or 1.1 and 1st gear is 1.2 or 1.1 max.

Does anyone have a clue as to what might be causing this. The car seems less torquey. It will still accelerate but not as hard as before, especially in the low gears.

I have had it pressure tested up to 30+psi so I do not believe it is a leak plus the boost does not drop in 5th at all and pretty much holds true in 4th as well. The issue is that I just can't get it to boost up as high in 1,2 and 3rd and therefore a not getting quick acceleration.

Any ideas???

thanks,
-Doug

 

Are you still running stock turbo? Do you run mbc or ebc? I am running stock turbo and mine peaks very similar to yours,with stock IC

 

EVO doer,

yes i am still runnign stock turbo. I have an MBC and a bigger FMIC.

Are you saying you see the same boost charastics as I do?

-Doug

 

My evo will spike 1.4 bar and back to 1.2-1.3 bar stock this is according to rally gauges the stealer installed. I just installed a catback, and a BOV, otherwise i'm stock. I'm going to add a FP, and mbc soon to hold the boost to 1.4-1.5 to redline.

 

ya - that is the idea -- I have an MBC and want it to hold boost to 1.4-1.5 to redline. That is only happening in 4th and 5th...not 1-3...urgh... this is so frustrating...