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Power Adder Getting a Supercharger or Turbocharger? Thinking about using Nitrous? All forced induction and N2O topics discussed here.

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Old 09-03-2009, 07:39 AM   #1
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Adding a supercharger to a high compression engne...

Well, first let me start off by saying my car made 420HP and 430TQ to the rear wheels with a T5 and my 383 stroker N/A. I have since switched over to an automatic, and I understand that my horsepower will drop off due to the increase rotation weight of things like the converter etc. I am fully expecting a 50-60 horsepower loss. To compnesate for this loss, I was thinking about adding a Vortech S trim or some other comparable belt driven centrifugal superchager at a modest 5-6PSI. The only problem is that my engine currently has about 10:1 compression. Is it feasible to run a small amount of boost with that high of compression just to make up a little power, or is it completely unadviseable? Thanks for any information or opinions on this!
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Old 09-03-2009, 10:48 AM   #2
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Re: Adding a supercharger to a high compression engne...

you could install real thick head gaskets to bring the compression down some. other than that, you'd really have to change out the pistons for lower compression.
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Old 09-03-2009, 11:40 AM   #3
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Re: Adding a supercharger to a high compression engne...

Are you running EFI? You could richen the A/F ratio and pull some timing to make it work. Not an ideal solution, but it will get you where you want to go.

Is this advisable? I wouldn't do it.
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Old 09-03-2009, 12:19 PM   #4
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Re: Adding a supercharger to a high compression engne...

or run E85......
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Old 09-03-2009, 01:35 PM   #5
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Re: Adding a supercharger to a high compression engne...

I bet you lose around 40rwhp by going to the auto. Blowers are put on stock LSx series engines that have 10.x to 1 ratio's, keep the boost reasonalbe and run MLS head gaskets and it should be feasable. Do you have aluminum heads, head studs, etc? Good fastners will definitely help.
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Old 09-03-2009, 01:37 PM   #6
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Re: Adding a supercharger to a high compression engne...

I don't see a problem with 6 psi on a 10:1 motor. It wouldn't be the ideal configuration and gives you less margin for error, but certainly has been done. Look at the various kits for LT1's and LS1's running over 7psi on stock engines no problem.

Just be conservative with your timing and AFR's and have fun.
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Old 09-03-2009, 01:46 PM   #7
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Re: Adding a supercharger to a high compression engne...

Tons of people running more then 6psi on 10+ comp.

Good read and links over here
http://www.yellowbullet.com/forum/sh...d.php?t=162651
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Old 09-03-2009, 04:22 PM   #8
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Re: Adding a supercharger to a high compression engne...

You could definetely do 6-8psi on 10:1 Im running 9.5:1 with 14psi just dont forget a nice and big intercooler and a great tune.
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Old 09-03-2009, 04:36 PM   #9
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Re: Adding a supercharger to a high compression engne...

look in to race gas.
110 octane will let you do a lot more
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Old 09-03-2009, 07:06 PM   #10
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Re: Adding a supercharger to a high compression engne...

it can be done. it has been done. and it will be done again and again. works good with no problems. and can be done with 93 octane fuel with correct timing set up.
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Old 09-03-2009, 08:39 PM   #11
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Re: Adding a supercharger to a high compression engne...

The key to anything is all in the TUNE ! keep it out of detonation. watch how aggressive you get with your timing.
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Old 09-03-2009, 08:39 PM
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