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post #1 of 10 Old 05-07-2010, 03:35 AM Thread Starter
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Help with over boosting

I have a 8.9lb spring in my tial 38mm wastegate but if I try and lay on the car the boost gauge jumps to 15lbs and will stay there! I have a hallman manual boost controller hooked up, but it is turned all the way down. Ohh and I do have a open down pipe. Pretty much a stock motor. Any ideas?


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pretty interesting...although I knew a guy whose son chewed through the backseat of his new Chevy Blazer on a vacation once....the guy asked the kid why, and the kid said he was just bored....
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post #2 of 10 Old 05-07-2010, 10:16 AM
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Where exactly is the wastegate located on the hotside? Post a pic. Also, what psi are you seeing with out the boost controller hooked up?


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post #3 of 10 Old 05-07-2010, 11:10 AM Thread Starter
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I havent tried taking off the boost controller. I figured since it was turned all the way down it wouldnt matter. Here is a pic

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Originally Posted by JSZ03 View Post
pretty interesting...although I knew a guy whose son chewed through the backseat of his new Chevy Blazer on a vacation once....the guy asked the kid why, and the kid said he was just bored....
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post #4 of 10 Old 05-08-2010, 02:17 PM
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I have the same WG and used the 8.9 psi spring on mine, no boost controller, and it holds steady between 8 and 9 psi.
What yours is doing is exactly why I dont run a MBC on mine. If you want more boost, just shim the spring or swap it for a stiffer one.

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post #5 of 10 Old 05-08-2010, 04:10 PM
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check your vacum line to the wastegate!!! make sure it has a good and isolated source!!!!!
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post #6 of 10 Old 05-08-2010, 04:45 PM
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It's 100% your wastegate placement and return routing to the downpipe.

Move wastegate so that it of over the merger right in front of the turbo
and gets a nice straight shot at the exhaust flow.

Then turn it 90* and have it hook into the DP at the S-turn
so that it is flowing with the exhaust stream.

From the pic, I guarantee that is your problem..


Tip:

When running low boost settings (i.e. under 10psi) wastegate placement
is more critical because it has to bypass a lot more exhaust to keep the
turbo from spooling up.


You could always just put a 15psi spring in there .......
problem fixed.

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post #7 of 10 Old 05-08-2010, 06:03 PM
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have you tried taking the mbc out of the equation?

are you sure your vacuum lines are routed correctly?

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post #8 of 10 Old 05-08-2010, 10:37 PM
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I won't go so far as to say 100% your problem ... I will concur that the placement is not optimal (especially how it ties back into the down pipe).
Remove the manual controller (only 2 vacuum lines so it's not like it's something time consuming) and see if that fixes the issue. If not, start looking at the wastegate. It really shouldn't be that bad where it is (though 7 psi past the spring setting is excessive). Try venting it to atmosphere and see if it holds near the spring setting.

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Stop crying, its just the internet. Life gets alot harder than some screen name on a message board not liking what you do to your car.
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post #9 of 10 Old 06-12-2010, 05:46 PM
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any luck pete85fox?

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post #10 of 10 Old 06-12-2010, 06:57 PM Thread Starter
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any luck pete85fox?
To be honest I havent even be back home yet. Im prob going to be gone until August. As soon as Im home Im going to finish the car and hopefully take it to the track for some times.

Thanks Pete


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Originally Posted by JSZ03 View Post
pretty interesting...although I knew a guy whose son chewed through the backseat of his new Chevy Blazer on a vacation once....the guy asked the kid why, and the kid said he was just bored....
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