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what should my peak boost be with 21cm?????

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Old 01-17-2008, 09:22 PM
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what should my peak boost be with 21cm?????
I have ground the fuel pin, advanced the timing almost to the head, open air filter, short strait pipe coming out in front of rear tire. I have not touched the fuel screw yet, its still in the stock possition.

So, what should I be seeing for peak boost right now?
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Old 01-17-2008, 10:15 PM
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Depends, . . . . . what's your EGT at WOT?


And what boost figure are you seeing?
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Old 01-17-2008, 10:20 PM
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a stock intercooled auto will see about 12, 5-speed is probably 14-18. fuel pin will add a few pounds but the timing bump will take some away. I'd say you should be somewhere around 20 without touching the fuel screw depending on how much you ground the pin.
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Old 01-17-2008, 11:02 PM
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Im going with 16.
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Old 01-18-2008, 12:46 AM
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mine was 20
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Old 01-18-2008, 01:01 AM
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Id say under 20. With whats done in my sig minus the 3200spring I was maxing at 22psi ands the fuel screw is turned in I just dont know how far. Ive tuned it to egt's
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Old 01-18-2008, 09:15 AM
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Im seeing 24-25 psi right now, just didnt know if that much boost with so few mods was normal.
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Old 01-18-2008, 12:44 PM
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With mild pump tweaks, and 190's, the most I ever saw was 22psi towing with the 21cm.
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