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408 & TTI Street kit HP estimate

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Old Apr 26, 2006 | 11:05 PM
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Default 408 & TTI Street kit HP estimate

Anyone running a 408 and a TTI Street kit? How much power are you making? How much HP do you think I will make with AFR 225s, FAST 90 intake ported by Tony Mamo with AFR, 90 MM FAST throttle body, custom comp cam, dual welbros, etc?

Thanks!!
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Old Apr 26, 2006 | 11:13 PM
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what size turbo and how much boost u planning on running?.... what tranny and rear also...
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Old Apr 26, 2006 | 11:14 PM
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mightymouse
346-370 cubes
T76 23psi
ls6 intake
probably stock TB or ported
906rwhp/975rwtq

not sure on his setup as he changes that $hit like the wind
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Old Apr 26, 2006 | 11:14 PM
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What is your CR? How much boost do you plan to run?

With turbo kits you pretty much set what power you want to make, long as your compression, fuel and turbocharger allow it.

What turbo will your kit come with? I'm sure you have a few different options.

If your getting a 408 built I will suggest 8.0:1 - 8.5:1CR for a turbo setup, you should be able to run quite a bit of boost on pump gas
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Old Apr 26, 2006 | 11:23 PM
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Originally Posted by MECHAM
mightymouse
346-370 cubes
T76 23psi
ls6 intake
probably stock TB or ported
906rwhp/975rwtq

not sure on his setup as he changes that $hit like the wind
Yeah but he has the race kit, not the street kit. RyanK has the street setup though...
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Old Apr 26, 2006 | 11:26 PM
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Originally Posted by Frost
Yeah but he has the race kit, not the street kit. RyanK has the street setup though...
opps..didnt even notice that..


ditch that street and get the race kit!
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Old Apr 26, 2006 | 11:35 PM
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no way I would run that street kit on a 408 seems like it would be backpressure like crazy
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Old Apr 26, 2006 | 11:35 PM
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Wow a 408 with big heads through an on-center turbo and single log.....that is going to be tough to tune and keep from blowing gaskets.
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Old Apr 27, 2006 | 08:46 AM
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Got that right DrTurbo.
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Old Apr 27, 2006 | 09:17 AM
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Originally Posted by Frans96SS
what size turbo and how much boost u planning on running?.... what tranny and rear also...
Opps, sorry I didn't include the necessary information. Turbo is a T-76, 8-10 lbs of boost. Tranny is a built 4L80E and moser 12 bolt w/ 3.42s.

The engine is a forged 408 outlaw iron block from Combination Motorsports. I am not sure what the CR is. Engine specs are:

LS1 6.0L iron block
Callies Racemaster 4340 Forged Crankshaft 4.000" Stroke
Callies Compstar Connecting Rods 6.125"
Mahle Forged Pistons 4.030" Bore, -12cc Dish
Mahle Plasma-Moly Piston Rings
PolyDyn Coated Clevite H series Cam, Rod, Main Bearings
ARP Main Studs
Fully Balanced
Assembled short block complete with build sheets


BIG QUESTION: When I read what you guys say about gasket trouble and backpressure (scary!!)what can I do to minimize the risks to my engine. I am not doing the build and will leave that to my builder, etc.

PLEASE RESPOND!!!

THANKS!!!!!
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Old Apr 27, 2006 | 09:19 AM
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Get rid of that turbo system or go with a smaller cube setup. That is my personal opinion, but its ultimately up to you.
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Old Apr 27, 2006 | 09:41 AM
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Originally Posted by DrTurbo
Get rid of that turbo system or go with a smaller cube setup. That is my personal opinion, but its ultimately up to you.
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Old Apr 27, 2006 | 07:33 PM
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ya a t76 is too small for a 408, so either go with a smaller motor or bigger turbo.
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