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-   -   What's the stock and max boost for VI STI? (http://www.perth-wrx.com/vb/mechanicals/22367-whats-stock-max-boost-vi-sti.html)

Rossco 21-09-2008 09:10 AM

What's the stock and max boost for VI STI?
 
Hmmm...Seems I'm only seeing a max of 14 psi in my my00 Vi STI (4th gear wot)

Is this correct? (I thought around 17 was stock?)

Car has VF29, Xforce 3" TBE, otherwise stock as far as I know.

Tried to search but no joy!

Cheers Guys.

BXT 21-09-2008 09:24 AM

Would've thought 16-16.5psi was the norm for the V6.

Rossco 21-09-2008 09:35 AM

That's what I thought too. Original turbo was a VF28.

Does the VF29 have a different wastegate pressure?

BXT 21-09-2008 09:46 AM

I wouldn't have thought so.....but most actuators on IHI turbos will start opening the wastegate at about 9.5-10psi so the fact you are running 14 means whatever boost control your using, is working. Is it the stock 2 port solinoid?

Maybe your Y-pipe or TB pipe has a leak or split causing a lose of boost.

Rossco 21-09-2008 09:50 AM

Yep, Factory setup.

Good thought on the y-pipe.....i'll check those joints.

Rossco 21-09-2008 09:51 AM

Who stocks silicone replacements in Perth?

BXT 21-09-2008 09:55 AM

Just about any good performance shop....but yours will most likely be either silicone already or mainly solid alloy with a short peice of silicone/rubber leading from the turbo to y-pipe......Non STi imprezas only came with crap dodgy corugated plastic ones.

Easy to whip the intercooler off to check.

phizzle 21-09-2008 10:02 AM

Are you sure your boost gauge is accurate?

Rossco 21-09-2008 10:23 AM

Auto meter pro comp......Would hope it's accurate!

Plumbed direct to manifold nipple.

Rossco 21-09-2008 10:25 AM

I want to replace the turbo inlet (plastic pipe) , so I might aswell replace all the factory I/c sleeves whilst I'm at it with the i/c off.


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