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turbo compression ratios #339255 Nov 30, 12:33pm Nov 30, 12:33pm
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turbo compression ratios
i have done some research and these are factory compression ratios on turbo engines:evo-8:8:1///gsx-8:5:1///sti-8:0:1///skyline-8:5:1///srt4-8:1:1---------------from what i have seen i think i will change my compression ratio to the 8:8:1 after i get the turbo but how much horsepower would i lose if i did that without the turbo or would i lose any??

Re: turbo compression ratios [Re: celicadragon] #339256 Nov 30, 1:43pm Nov 30, 1:43pm
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shonen
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Without boost you would lose at lot of horsepower. Going from 11.5:1 to 8.8:1 for a naturally aspirated car is like having a turbo car with a dead turbo, there is like no power at all. You would probably lose maybe like 20hp,not sure exactly how much, but since the car is tuned specifically as a high compression engine there will definely be some power lost.

Re: turbo compression ratios [Re: shonen] #339257 Nov 30, 1:49pm Nov 30, 1:49pm
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but the loss will be well worh it since 1 lb of boost is like 12 hp so i drop it to 8:8:1 lose 20hp up boost by 2 lbs and back to original then up the boost another 5 lbs and be good right that way i would be aroung 15 lbs of boost on a strenghted engine should be good


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Re: turbo compression ratios [Re: celicadragon] #339258 Dec 1, 6:19am Dec 1, 6:19am
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does anyone know about all this stuff?


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Re: turbo compression ratios [Re: celicadragon] #339259 Dec 1, 11:03am Dec 1, 11:03am
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shonen
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Dropping the compression will allow more boost and more power but as your first statement stated without boost dropping the compression is dumb but is great for you turbo idea.
If you are really planning on high boost you may want to talk with whomever you are ordering your turbo kit from or the people you're ordering your rods and pistons from, they should have some experience and help you get the right compression.

Re: turbo compression ratios [Re: shonen] #339260 Dec 1, 11:37am Dec 1, 11:37am
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I've heard of people running like 6lbs of boost with stock 11.5/1 compression. Could you keep stock pistons if you only boost it slightly?

Re: turbo compression ratios [Re: celicatuner] #339261 Dec 1, 11:44am Dec 1, 11:44am
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Yes on low boost like 6 psi, you can run on completely stock internals. The only upgrade you would need is a new clutch. However most people get boost happy and arent content with staying at 6 psi.

Re: turbo compression ratios [Re: Johnsgt] #339262 Dec 1, 12:40pm Dec 1, 12:40pm
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i probably would wanna boost it up a month after i get it but i am gonna go evo compression on this one since 8:8:1 is the highest i have seen done on a factory turbo engine and i have seen evos factory turning boost up to 20 psi so i'm gonna try it...someday soon i hope


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Re: turbo compression ratios [Re: celicadragon] #339263 Dec 3, 11:00pm Dec 3, 11:00pm
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Im currently boosting at 8psi in my GTS. Im also in the process of getting the 8.8:1 forged pistons, rods and probably sleeves. Running at 14psi with these forged pistons will get you to aprox 320whp. Clutch is a MUST, and take care of your transmission. Oh, and please do not use the 8.8:1 pistons if you are not going turbo; the loss will be more than 20whp.

Re: turbo compression ratios [Re: fraugts] #339264 Dec 4, 1:26pm Dec 4, 1:26pm
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i definately wont be doing that i just was curious of what everyone would think the loss would be you thin more than 20?


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