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Old 04-27-2011, 11:19 PM   #1
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twin turbo build.

Well, I've been building my car for about a year and a half now. I wanted to go kenne bell but have now decided to twin turbo. Should I go with the hpperformance kit? Or Hellion? Also I am not sure the ideal compression ratio I want to be at.8.5:1, 9.5:1? I have ported heads intake and exh side I got from a forum so I am not sure the cc of them to be able to match with piston size.
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Old 04-27-2011, 11:22 PM   #2
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Re: twin turbo build.

It all depends...What is the vehicle? What are the definite mods? What is the drivetrain combo? What are your goals?

-Will
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Old 04-27-2011, 11:23 PM   #3
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Left a big chunk of that out sorry lol, its a 99 GT staying 2v.
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Old 04-27-2011, 11:24 PM   #4
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Re: twin turbo build.

Turbo Kits for Ford Mustangs

Check it out....I know it's a single kit instead of a twin, but it's about as affordable as you'll find. The forward facing kits they've recently introduced should be capable of big power also.

Are you wanting to build a racecar that is as fast as possible....or do you want a street car that makes good power and is still fun?

-Will
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Old 04-27-2011, 11:27 PM   #5
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Built rear end 31 spine Detroit locker 3.73, rebuilt tranny, clutch, billet steel flywheel. Cobra alum shortblock, port n polish pi heads, crower custom grind cams, ss ex 1mm oversized valves, full bolt ons, tubular suspension, coilovers, will be mainly a track car but will want to take it on the street so good daily drivability. Would like to see around 500-600 roughly rwhp.
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Old 04-27-2011, 11:30 PM   #6
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Re: twin turbo build.

Good detail.

I'd go w/ the 9.5:1 personally. It'll help you have a bit more low end and spool quicker, and it shouldn't present a problem w/ the power levels you are aiming for. It'll just make for a more fun street car.

I think you'll probably be fine w/ 3.73's, but remember that you don't need a lot of gear w/ a turbo setup.

Ported PI heads, crower cams, and a good shortblock should easily support 500-600. An extrude honed Bullitt Intake or Trick Flow manifold would be ideal...maybe even one of the P-51's (I have never seen one in person lol), but a PI intake would probably do the job

-Will
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Old 04-27-2011, 11:32 PM   #7
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I have been considering the forward facing kit from on3, not sure if that's the link you posted or not haven't looked yet but I assume so. Only reason I'm contemplating twins is I think I would have to run around 20 psi to be where id like it. Turbo life and efficiency will increase a lot more if I ran ten pounds each turbo rather than 20+ on a single. I was thinking 57mm's. Wouldnt have too much turbo lag, but still be good size.
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Old 04-27-2011, 11:34 PM   #8
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Re: twin turbo build.

Quote:
Originally Posted by 35anngt View Post
I have been considering the forward facing kit from on3, not sure if that's the link you posted or not haven't looked yet but I assume so. Only reason I'm contemplating twins is I think I would have to run around 20 psi to be where id like it. Turbo life and efficiency will increase a lot more if I ran ten pounds each turbo rather than 20+ on a single. I was thinking 57mm's. Wouldnt have too much turbo lag, but still be good size.
Twin 57's would definitely get you there!

-Will
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Old 04-27-2011, 11:35 PM   #9
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After my break in period the stocker is coming off I like both the p-51 and reichard racing intake but as with everything have heard negative things with both. Still have heard good things about the edelbrock. But I am not too worried about it. I also have a tfs plenum and 75mm tb up top.
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Old 04-27-2011, 11:38 PM   #10
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With my heads ported, intake and ex side. How much will that affect my compression ratio? I think 18cc dish would put me at 9.5:1 correct? How much could the cc be altered from the heads?
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Old 04-27-2011, 11:44 PM   #11
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Re: twin turbo build.

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Originally Posted by 35anngt View Post
With my heads ported, intake and ex side. How much will that affect my compression ratio? I think 18cc dish would put me at 9.5:1 correct? How much could the cc be altered from the heads?
Porting shouldn't affect compression ratio....gasket thickness and milling the heads would. You need to talk to your engine builder about that.

-Will
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