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Herr-Kuhn Herr-Kuhn is offline
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Join Date: Aug 2006
Location: Cincinnati, Ohio
Posts: 1,019
Great work. I'm unclear on why everybody thinks the driveline is going to break. Torque breaks parts, not HP. Your car is running a nice, solid 500 ft-lbs which should be easy to deal with. These drivelines can handle more torque than that, but not likely for long duration. I've seen my car lay down 635 ft-lbs on the dyno without blowing up. If you keep that trans cool you should be able to cope with that torque, even on a track.

It is easy to see you have the cams and intake setup for the higher powerband range, which for a track car, is what you really want (in most cases). The individual throttle bodies do cost you some in the midrange, but they flow more upstairs and since the car is light you will still have plenty of power midrange to pull it as hard as you want. I also assume there is some overlap on the cams to get it to sing out past 7K like that.

Nikasil...I say that is a good idea, because you will make the engine last longer and lower the friction of the system as a whole. If the sleeves can be pulled easily then you can always have them re-plated if they get damaged. Motorcycle and snowmobile guys do that all the time to freshen them up. Same can be done on a plated aluminum block, assuming you can deal with the tear down.

Some questions:

What cams are you running?
What is the bore size?
Speed density or MAF controlled?
Batch or sequential?
Knock sensors installed?
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Kuhn Performance Technologies, LLC
Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane.
Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane.
Old 07-31-2009, 09:38 PM
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