Boost on 11.6:1 C/R

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May 29, 2007 | 05:57 PM

LostCauseZ06

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From: Ogden, Utah

Boost on 11.6:1 C/R

alright i have a slightly stupid question. I have recently been bitten by the turbo bug. i HAVE to have a turbo but i really dont want to swap out my pistons.

How much boost could i get by running on my forged 408 with a high C/R??? any ideas?

May 29, 2007 | 06:00 PM

sprayjunkie

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From: sofla

I would pose this question directly to your engine builder and your tuner.

May 29, 2007 | 06:01 PM

Retail Value

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From: Houston, Tx

no more than 5 psi on a VERY VERY VERY conservative tune...

May 29, 2007 | 06:07 PM

ls1CANTU

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From: Edinburg, Tx

would like to know this too.

May 29, 2007 | 06:15 PM

HUNTER02SS

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From: Kennesaw, Georgia

You could probably run more than 5psi, but you would have to run race fuel with it all the time and no timing I would guess.Not sure though,but you can just buy a set of head's with bigger chamber's and run some thick head gasket's also to help lower the compression.IMOA

May 29, 2007 | 06:16 PM

KAOS

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subscribing. with race gas how much boost can you run with that high of compression. and what would be the outcome, blown head gaskets?

May 29, 2007 | 06:23 PM

HUNTER02SS

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From: Kennesaw, Georgia

If it was my setup i would run 10lbs of boost and the race gas and play with the timing,but I would not go over 10lbs.What is the stock compression like 10.5 or close to it,so it is not that far off of stock.That is what I would do if it was my car but I like the extreme of thing's anyway.

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May 29, 2007 | 06:39 PM

Lythropus

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From: South Carolina

I'm going to say 6 pounds for over 100 horsepower again, don't do it, you won't make as much as with nitrous and it will be more prone to detonation...

May 29, 2007 | 06:48 PM

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ALTRDTA

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From: Utah

I say do it Chase and see what you can get out of it. You have the money just burning a hole in your pocket so go for it.... Don't be scared. lol

May 29, 2007 | 07:00 PM

#11

cws T/A

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From: Texas

http://musclemustangfastfords.com/te...pression_ratio

May 29, 2007 | 07:22 PM

#12

HUNTER02SS

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From: Kennesaw, Georgia

After reading that I woould say boost the hell out of and see what happen's ,especially if have the $ to build another engine if this one

on you!!

May 29, 2007 | 08:22 PM

#13

Speed

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From: Ok

How much boost at what octane will be an exercise of trial and error. You obviously will be much more limited, you will extract more power for a given air flow vs a low compression engine. If I had to guess, I would say 10psi on 118 with 15* or so of timing will net you very respectable results. Meth/water injection will help stabilize the mixture if you are picking up knock.

Be vewy vewy cafull and take it slow.

May 31, 2007 | 09:07 AM

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Bad30th

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From: San Diego, CA

I was making 5-6psi on 11.6:1 on (mostly) 91 octane pump gas for a while before I got new heads. I just pulled the timing back a little and ran a little race gas for extra insurance. It ran great and pulled hard, and it was on the stock bottom end too with a 222/224 cam on a 114 LSA.

I'd buy some larger chambered heads to lower compression before I swapped pistons, seems like a lot less work...

Rob (Bad30th)

May 31, 2007 | 09:12 AM

#15

smokinHawk

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From: Columbus, ohio

man i sware i just locked one of these
your gonna have to tune and see, there is no set psi to CR to many varilbes
https://ls1tech.com/forums/forced-induction/208864-turbo-faq.html