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Boost with higher compression

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Old Jan 7, 2004 | 04:48 PM
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Default Boost with higher compression

I have a 98 SS with PP stage II 5.3 heads,TSP 231/237 cam and most bolt-ons. I went this route because I never figured I would run FI.

My brother-in-law has a powerdyne blower that used to be on my car (I bought it from him). It has been collecting dust for going on 2 years now. I could pick it up pretty cheap.

Could I get away with running 4.5-6 lbs of non-intercooled boost with my setup?
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Old Jan 7, 2004 | 05:26 PM
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with race gas, for sure.
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Old Jan 7, 2004 | 06:11 PM
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I drive the car too much to use race gas all the time.
I guess I'll stick with my original plan of more cubes. It's just tough to see the blower sitting there without thinking about putting it to use
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Old Jan 7, 2004 | 06:32 PM
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put er up for sale along with the heads and save up for a big boy FI kit
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Old Jan 8, 2004 | 12:06 AM
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Don't mess with high compression and boost, on 93 with 10.6:1 comp and 6psi I blew the head gasket on #7
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Old Jan 8, 2004 | 10:14 PM
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Sell that Powerdyne FO SHO !
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Old Jan 9, 2004 | 12:55 AM
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You probably wouldn't gain much over what you have now... that Powerdyne head unit doesn't flow enough air to support high HP.
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Old Jan 9, 2004 | 07:17 PM
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Im sitting at a 11:1 compression on my LPE heads and cam motor.
Running 4 psi of boost at this time. Not going to go more till the bottom half is done. Good Luck !
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Old Apr 19, 2004 | 04:20 PM
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Originally Posted by LINGENFELTER SS
Im sitting at a 11:1 compression on my LPE heads and cam motor.
Running 4 psi of boost at this time. Not going to go more till the bottom half is done. Good Luck !
How much RWHP did you put out?
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Old Apr 19, 2004 | 05:31 PM
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Originally Posted by Ed LS1 Vert
How much RWHP did you put out?
510 rwhp on 4 lbs of boost
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Old Apr 19, 2004 | 07:46 PM
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on 93 octane? have you noticed any pinging or getting any KR?

-Sly
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Old Apr 19, 2004 | 09:50 PM
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Originally Posted by slyws6
on 93 octane? have you noticed any pinging or getting any KR?

-Sly
Nope none of that. The guys at Speed inc. gave it a conservative tune.
Also told me I shouldnt go over 5 psi. So I keep it at 4 lbs .
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Old Apr 19, 2004 | 10:31 PM
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I would like a bit more info on your set-up.
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Old Apr 20, 2004 | 01:19 AM
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Originally Posted by Ed LS1 Vert
I would like a bit more info on your set-up.
Ok, LPE Top end kit(heads and cam). Procharger D1SC, 42lbs inj. ,Fuel pump. Anything else. I sold the D1SC Procharger and fuel system by the way. Going Turbo route from QMP. The procharger was very good to me, and it will be missed. .
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Old Apr 20, 2004 | 06:26 AM
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Lingenfelter SS: What size combustion chambers are on those heads? Are you running the factory short block? Also do you know how much total timing your running? Reason I ask is that I have the PP Stage III LS6 heads with the 59cc chambers and am looking to build a turbo kit here shortly, I'll be taking the heads off to have the combustion chambers opened up but want to wait until I get the kit on and ensure everytthing works right. Thanks...

-Sly
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Old Apr 20, 2004 | 10:27 AM
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Yes what was your timing and A/F?
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Old Apr 20, 2004 | 02:13 PM
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Originally Posted by Ed LS1 Vert
Yes what was your timing and A/F?
Combustion chambers on my heads I would have call LPE (I forgot what they told me). AF my average was 12.5. Timing Jim at Speed inc. did the tuning.
But I could ask.
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Old Apr 20, 2004 | 03:24 PM
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Originally Posted by LINGENFELTER SS
Combustion chambers on my heads I would have call LPE (I forgot what they told me). AF my average was 12.5. Timing Jim at Speed inc. did the tuning.
But I could ask.
12.5 isn't exactly conservative.
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Old Apr 20, 2004 | 03:48 PM
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Originally Posted by 1point3liter
12.5 isn't exactly conservative.
Well its not crazy either. I got that one of my dyno sheets at FinishLine Performance.
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Old Apr 21, 2004 | 01:56 AM
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With the overlap of that cam (231/237) there would be so much CR bleeding off that it will run fine on 93. Definitely run MLS gakets. The dynamic CR of that set-up is near 9.7:1 which would work up to 9psi. The off-boost performance wont be the best if you lower static CR. If you go with a smaller cam then you can't run the current compression.
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