Boost Creeeeeeep !!!
02-04-2003, 04:20 PM
#1
0.5 BAR
Thread Starter
Join Date: Dec 2002
Posts: 150
Boost Creeeeeeep !!!
Any of you people getting boost creep on your setups?
I am using the Subaru IHI and The wastegate is 8psi and I have gone past that not knowing a couple of times. Anyone know how to fix it? I was thinking of modifying the dumpipe exhaust flange on the turbo
?
Any suggestions ?
I am using the Subaru IHI and The wastegate is 8psi and I have gone past that not knowing a couple of times. Anyone know how to fix it? I was thinking of modifying the dumpipe exhaust flange on the turbo
?Any suggestions ?
02-04-2003, 06:34 PM
#3
Guest
Posts: n/a
Re:Boost Creeeeeeep !!!
Actually, I found an article today about a 2 stage boost control made out of your wastegate.. Uhm, let me find the post..
http://pages.cthome.net/gus/pictures.html
You can use this idea to keep your max boost..
http://pages.cthome.net/gus/pictures.html
You can use this idea to keep your max boost..
02-05-2003, 09:28 AM
#8
Guest
Posts: n/a
Re:Boost Creeeeeeep !!!
YAY u have the same turbo and same problem i have.
i did a little research yesterday. i also had a pin in my rod to make just 8psi however i would get boost creeps of 14psi in third, pretty scary but my motor (so far knock knock) has held up like a champ.
it has to do with the exhaust. i had no downpipe at all, the flange was off so it was like running it off the turbo. check it out. most people i have spoken too on the matter have said that even a 2.5 inch depending on the exhaust size might be big because thats one small turbo. however i have a 2" and a 2.5 inch and have yet to test it. i am almost sure thats the problem.
if you have questions email me at work
ramaro@healthpart.com i would be glad to help
i did a little research yesterday. i also had a pin in my rod to make just 8psi however i would get boost creeps of 14psi in third, pretty scary but my motor (so far knock knock) has held up like a champ.
it has to do with the exhaust. i had no downpipe at all, the flange was off so it was like running it off the turbo. check it out. most people i have spoken too on the matter have said that even a 2.5 inch depending on the exhaust size might be big because thats one small turbo. however i have a 2" and a 2.5 inch and have yet to test it. i am almost sure thats the problem.
if you have questions email me at work
ramaro@healthpart.com i would be glad to help
02-19-2003, 01:44 PM
#9
0.5 BAR
Thread Starter
Join Date: Dec 2002
Posts: 150
Re:Boost Creeeeeeep !!!
Well I figured it out, Cause the Subaru uses that flat plat with a indent on the inside the wastegate hardly opens, I had to modify it with my dremel and angle grinder and it works good. B4 It would creep to 10 or more, and now it creeps 1 psi max from 5 to 6 through every gear (except 5th never tryed). Only thing is that the spring in the wastegate is rated for 8psi but only get 5 even at WOT?? I am not complaining cause I daily drive this thing so 5-6 is fine with me, I guess I will try using a boost controller to see if i can raise it when I go dyno.
02-19-2003, 03:55 PM
#10
1.0 BAR
Join Date: Jan 2003
Posts: 586
Re:Boost Creeeeeeep !!!
if your running an intercooler, that's why your only reading 5psi boost (if your measureing at the TB or intake). the intercooler cools the air, cooler air is less dense, there fore you get less measureable boost. you might be pulling 8psi AT the turbo, but by the time it cools, it may only read 5psi. now, if you reading 5psi AT the turbo, then disregard everything i said. 
also, curves and bends can drop boost levels, but i can't explain why on that one.
also, curves and bends can drop boost levels, but i can't explain why on that one.
