how much boost?? - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
 
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Old 11-10-2010, 12:57 PM Thread Starter
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how much boost??

ok so i tried to search for this but couldnt find anything on it.. i have a 2.9" pulley downpipe, exhaust, (3") stage 2 clutch. and a tune. how much boost should i be making. i think right now when i floor it i get about 13.5-14lbs. it jsut seems a little low. but its pulls hard as hell. ive heard that you dont ahve to make boost to make power. and some things you do will make less boost but it makes less boost more efficiently so it makes more power at less boost. any help would be appreciated thanks.

BLACK COBALT SS 2007:
3" ZZP HIGH FLOW CAT DOWNPIPE
3" MAGNOFLOW CAT BACK.
MEGAN RACING LOWERING SPRINGS APROX 1.25"
TINTED WINDOWS
3 10" SUBS
GM STAGE 2 CLUTCH
BRAND NEW TRANS
FEW LITTLE LOOKIN GOOD GOODIES

2.9" pulley
42lb injectors
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Old 11-13-2011, 09:27 PM
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My little truck stock makes a little over 15lbs boost. All the HHR SS cars are 2.0 TC.

BTW: I was born in the Community Hospitol and went to Poly.

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Old 11-18-2011, 10:45 AM
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Your boost should be about right given that you have a testpipe, (downpipe is for turbos). The more free flowing exhaust you have, the lower the boost on the SCs from what I understand.
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Old 11-19-2011, 09:49 PM
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This is true.

Boost pressure (TC or SC) is the difference between intake manifold pressure and incoming air pressure. If your intake manifold has less pressure, ie less back pressure because of better flowing exhaust, your incoming pressure is going to be measured as less. But that does not mean less flow. The more air your engine flows, the more power produced. Boost pressure is only one of the air flow factors.

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Old 12-07-2011, 01:37 AM
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Thanks that answered my question too.


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Last edited by jameslattimer68; 12-08-2011 at 02:29 AM.
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Old 01-22-2012, 12:47 AM
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the ECU performance chip link gives me a ?

This looks as if it could only be for a non-LNF turbo. I other words..it does not appear to be sophisticated enough to do the job. It would have to defeat the read/learn down feature on my LNF. It should be well known that you can just make for reflash costs unless you have the real deal.
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Thanks that answered my question too.
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Old 01-23-2012, 10:11 PM
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Originally Posted by RedSStreak View Post
Your boost should be about right given that you have a testpipe, (downpipe is for turbos). The more free flowing exhaust you have, the lower the boost on the SCs from what I understand.
I would have to agree with this. I have a 2.7" pulley and I'm only getting about 14-15 PSI at 7000RPM. I have a CA V2 header and ported head, not a very restrictive flow.

Mike

Mike Cottingham
CEO MikeCottingham Industries Inc.

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