boost spike

kh15 · 04-13-2008, 11:20 PM

is there any definitive way to cure boost spike with the 2.5's?
everybody i talk to says something different
gm bcs
prodrive bcs
adjust wastegate arm
port wastegate
go ewg
bleed type mbc
im only spiking 2 psi over my target to 19.5. but i just want to give a shot at fixing it so i dont wear the seals out on my td04. otherwise my car runs fine according to logs and i get no fuel cut.

sfelix818 · 05-25-2008, 12:32 AM

Only time you have to worry about boost creep is if your running a catless dp, but I dont see that you are in your mods list. To answer your question go to cobb.com and they have a restictor pill fix for boost creep, or get a good tune/somekind of em (only need this if you running a catless dp) other than that you should have no isue with boost creep. It just may be you boost gauge acting up. what kind of gauge do you have?

dumdum · 05-25-2008, 10:14 AM

The stock bcs does not do very well at higher boost levels.Even the 2.0L's have problems with the stock BCS when running higher boost pressures (18psi +).This of corse can be a problem with the 2.5L WRX's when your running that high of boost pressure regardless of you have a catted DP or not.The stock BCS can't bleed the air off fast enough.Get a 3 port BCS.

Longshot · 05-25-2008, 10:17 AM

Don't adjust the WG arm unless your at your tuners and they can alter the map. You can use a combo of a 3port bcs, ported WG, and a tune for the bcs and that should solve the problem. You're not spiking badly but like myself you also want your car to run as best it can.

Longshot · 05-25-2008, 10:22 AM

Quote:

Originally Posted by dumdum

Get a 3 port BCS.

Yeah, not to mention your tuner should be able to make the TD-04 spool a bit sooner with it. It will help hold boost much better as dumdum said.

Subistrong · 07-05-2008, 10:43 AM

Quote:

Originally Posted by sfelix818

Only time you have to worry about boost creep is if your running a catless dp, but I dont see that you are in your mods list. To answer your question go to cobb.com and they have a restictor pill fix for boost creep, or get a good tune/somekind of em (only need this if you running a catless dp) other than that you should have no isue with boost creep. It just may be you boost gauge acting up. what kind of gauge do you have?

i had the same problem all i did was swap my boost lines with a buddie that had a 2003 wrx off his old turbo and i havent had a overboost problem yet!