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Old 11-24-2008, 01:55 AM   #1 (permalink)
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Default Best/Safest boost for my CR

I was wondering what would be the safest and best amount of boost for my compression ratio?

I have .20 wiseco pistons with a 8:8:1 CR and DCR 5 layer head gasket.

Most mods in sig.

thanks
stephen
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Old 11-24-2008, 05:35 AM   #2 (permalink)
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depends on the fuel octane
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Old 11-24-2008, 09:11 AM   #3 (permalink)
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93 and also c16
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Old 11-24-2008, 09:43 AM   #4 (permalink)
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Do you have a scan guage?
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Old 11-24-2008, 09:46 AM   #5 (permalink)
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Quote: Originally Posted by Darksyde View Post
Do you have a scan guage?

sorta lol

(bitts scangauge in car right now)
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Old 11-24-2008, 12:16 PM   #6 (permalink)
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Then there ya go! Watch your knock and timing and a/f Then you will know what is safe.
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Old 11-24-2008, 02:41 PM   #7 (permalink)
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Are you looking for safety as far as knock or PSI???
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Old 11-24-2008, 06:38 PM   #8 (permalink)
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Quote: Originally Posted by BI_SRT-4 View Post
Are you looking for safety as far as knock or PSI???

Both.
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Old 11-25-2008, 04:36 AM   #9 (permalink)
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Werd...hope these pistons can take a beating as i've just ordered 'em. I'm on stock turbo though...not .50 trim like Stephen
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stock turbo and 750's you may run outta fuel try some 1600's

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Old 11-25-2008, 06:46 AM   #10 (permalink)
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With that high of cr, you wont be able to run a lot of boost on pump due to kr, but on c16 youll be able to run a good amount! Just keep an eye on afr's, timing, and knock, and youll be good!
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Old 11-25-2008, 01:57 PM   #11 (permalink)
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Quote: Originally Posted by BOOSTINSRT04 View Post
With that high of cr, you wont be able to run a lot of boost on pump due to kr, but on c16 youll be able to run a good amount! Just keep an eye on afr's, timing, and knock, and youll be good!

cool, thanks

from what i was reading higher CR pistons make more horses on lower boost then lower CR pistons?
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Old 11-25-2008, 02:15 PM   #12 (permalink)
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18psi max on pump and 28psi+ on c16 (atleast that was the most I could run on 91octane)
20-23psi on 100octane and 24-26psi on 110octane.
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Old 11-25-2008, 02:20 PM   #13 (permalink)
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Quote: Originally Posted by reed32 View Post
18psi max on pump and 28psi+ on c16 (atleast that was the most I could run on 91octane)
20-23psi on 100octane and 24-26psi on 110octane.

ok cool, we have 93 octane and ive been running at 20 psi with water/meth injection
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Old 11-25-2008, 02:39 PM   #14 (permalink)
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my 8.5:1 setup with the 5 laye.r @18psi w/meth was all 93 pump would do for me. got me 428 though so thats nothing to sneeze at.
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