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Put together a dart iron eagle 427ci and the compression is a little over 10:1. This is to be a turbo motor. Not sure if its too high as I have no knowledge of boosted motors


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Depends on how what gas? E85? , pump, race? And how much PSI? Because your not crazy high just on the ahhhh I don't know end of pump gas, but the others you could.

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Years ago I ran around that compression with a B-trim Vortech and I think it was 12lbs of boost. I had no after or inter cooler or meth or even a custom tune. I ran 93 octane on the street and dumped 116-118 into it at the track. Only other thing I did is at the track I adjusted my 6btm.


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I have 10.16:1 on my 5.4 and I'm planning on going turbo. I'm hoping to run e85 if we can get a local station, but if not I'll run 93 and meth.


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This is my first stab at a turbo sbf, but with my old Turbo Dodge, it had much better throttle response and spool up with a little more static compression, I think with either
e85 or meth. it will be ALOT of fun on the street and a complete animal at the track.
 

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Are you looking at a S400 chassis? With those cubes I'd look more toward a S500-88 or GT50-55.

If you're stuck on the S400 put use the 1.32 housing.
 

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If that's what they suggest they know your goals better than me. Wouldn't hurt to get a second opinion from Reed at Work Turbos or Chris at CRT.

That turbo will probably be done at 6k, but depends on what you're doing with it. It'll make some steam.
 

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The 96mm is the turbine. The common wheels for the S400 are 87mm, 92mm and 96mm.

Check out Yellowbullet in the turbo section. Wealth of knowledge over there.

E85 with that compression would make for a responsive street car. I will be running E85 as I have a station 5 minutes from my house. Living in the corn country has its perks.
 

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I agree its the turbine, I was curious though cause it sounded off when I asked what size turbo.
Most would think he is running a 96mm compressor with a reply like that.
 

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Not sure if its too high as I have no knowledge of boosted motors
:idunno:
What are your goals/ plans for the car???

The compression is fine, DEPENDING on the fuel you choose and amount of timing.

Will it have EFI or a Blowthru Carb??

If it were mine, E85 would be my first and only choice for several reasons. Cost, tuning window (compared to pump gas/meth), cooling capabilities (no intercooler needed). I would buy a 55 gallon drum of it if its not readily available in your area.
 

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With a good tune and fuel, 10.5:1 is totally acceptable. The block will handle upwards of 1300HP, as long as your rotating assembly is forged up, it'll be quite a beast. I plan to go 10:1 on my 327 with Super T76.
 
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