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· 6.9 6 speed
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4,711 Posts
Hughes has some that will give 8.6:1 which I will take a closer look at once I pull my motor apart to see the actual specs of it.

I want to run lots of boost on pump gas (15 psi) and just to be safe...
I was seeing 14psi with 9.3 compression and pump gas. 8:1 will be a dog until you get into lots of boost. You have a centrifigual sc so you need the compression till you get into some decent boost. There are no issues with higher compression as long as you have a good tune
 

· 6.9 6 speed
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4,711 Posts
I was told the same thing about mine being low compression (and about running stock heads/cam)... Now mines no beast but its definitely no dog either. Maybe I just got lucky. :huh:
im sure you would see a difference if you had higher compression pistons.
 

· 6.9 6 speed
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4,711 Posts
ok maybe dog was the wrong term but the idea behind low compression pistons in boosted aplicatons is starting to change. Twin screw or roots style blowers are a different situation.

especially if you have aluminum heads since they decrease the chances of detonation.
 

· 6.9 6 speed
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4,711 Posts
True, I don't mind the extra safety margin. I will give up a few HP for that.
Its all in the tune. Chris got mine done in no time once the little bugs were worked out. Only took him about an hour to get my meth tune done and not much more for my tune without meth. Its sweet to have a good tuner that less than 2 hours away.
 

· 6.9 6 speed
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4,711 Posts
Do you know what heads your using and what the chamber size is? I dont understand how you can just buy 8.2:1 pistons without knowing you chamber size.
 
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