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Old 07-15-2010, 10:32 PM   #1
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Reasons for not reaching target Boost

Guys, what are some reasons that I cannot reach my target boost of 8 psi? The ones I can think of are:

1. I still have my restrictive stock exhaust on. Can this limit the boost I can make and increase my spool time?

2. A leak in the charge piping somewhere..

3. I have a base tune installed right now (although I didn't think a tune could greatly affect how much boost you are making)

4. Inaccurate boost gauge

My gauge tops out at about 6psi. Power comes on hard around 2500-3000 rpm and then I would say it levels off from 4000 rpm on. Is this expected? It is just bugging me that I do not see the 8psi on my gauge..makes me feel like I'm missing power. Thanks for your input.


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Old 07-15-2010, 10:39 PM   #2
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all = fail..... sounds like you may have a little bit too small a turbo for it (trust me I don't know what I'm talking about when it comes to turbos....)


the exhaust I'm willing to bet is a MAJOR MAJOR factor though.....

maybe the spring in the wastegate is only good for about 6 psi even.....?
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Old 07-15-2010, 10:52 PM   #3
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yea I was told that about the exhaust when I bought the kit. To clarify this is a FSwerks stage 1, with a GT28R turbo - which is supposed to run at 8psi.
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Old 07-15-2010, 11:07 PM   #4
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ok then it's more than likely the exhaust.....
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Old 07-16-2010, 02:02 AM   #5
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1. You should NOT be running any Turbo set up on the stock exhaust. It will blow up soon. (I don't know that for sure, I've just been told it's bad)

2. If you're driving the car around with just the base tune bad things could happen really quickly.
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Old 07-16-2010, 06:48 AM   #6
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Ok....boost pressure is a measure of the RESISTANCE to flow.

In other words, small exhaust does not limit the maximum boost pressure, but it will make you spool slowly. Kill your turbo????? No.

Tune only affects boost if you are not tuned for higher RPMs and you are getting some sort of torque control that is kicking in. So the ECU may be cutting spark or fuel because it doesn't like the boost/power building like it is. You would definitely feel this, though. Would feel more like a stutter.

Leak in charge piping is a very possible candidate. I had a vacuum leak and the car was struggling to get past 5 psi.

Inaccurate boost gauge is possible, but there's no way you know what you have your boost controller set at. It should continue to go up as your boost controller is adjusted.
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Old 07-16-2010, 07:04 AM   #7
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I will attempt to tighten all of my hose clamps tonight or tomorrow and see what happens. KJSoccer, from what I know my "base tune" is actually someone else's final tune. Randy distributes his programs in that way, you get someone else's final tune (for your ecu and car of course) and then he builds on top of that if needed. I watch the A/F ratio and everything appears to be in order.

Whenever I turn my key on 2 clicks (not starting it though) my boost gauge zeros itself and it always starts about half a needle width below 0. When I turn the car on it goes in to vacuum like it should. Maybe since the zero-ing point is off, the ~6psi I'm seeing is actually ~7 and maybe because of a leak in the hose I'm taking boost from, that 7psi is actually ~8.

All I know is that it stops making boost at or before 4000 rpm. Having been in other turboed cars, it feels like it should continue to provide more boost as you climb higher in rpm. I could be wrong though.
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Old 07-16-2010, 07:57 AM   #8
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Good grief, stock exhaust w/ boost? Jeez...

The stock exhaust is restrictive for even mild N/A builds, let alone boost.
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Old 07-16-2010, 08:05 AM   #9
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I know man, I just dont have the funds for a new exhaust right now.
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Old 07-16-2010, 09:07 AM   #10
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ya, with the stock exhaust you will be more then disappointed with everything, trust me on that one LOL

i was disappointed when i had a 2.25 from when i was N/A, so within a week of having stage 2 i went 2.5" and never looked back. bigger exhaust will let your turbo flow better. right now you have a huge bottle neck at the exhaust, going from a 2.5" down pipe to a 2" factory exhaust likely still having factory cat aswell. grab a trubendz if your on a tight budget, they are around 300$ IIRC for a stainless 2.5" and cheaper for a alumized.

just to put this into perspective for ya when i installed my 2.5" exhaust i was running 11psi with the 2.25 exhaust, when i did a WOT pull, boost went up to 14psi
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