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Kirkham Motorsports

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Old 05-08-2008, 11:04 AM
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The Roush SR "only" generates about 485 hp, the sr/tw is about 520hp and the r is 550hp. The problem with the "R" is it generates all it torque above 4000 rpm. Not very streetable when going from stop light to stop light. The sr develops all it torque very low and the sr/tw is a happy medium. I am sure Wayne will recommend the sr/tw. The only difference between the sr and sr/tw is the camshaft. The r is a little more radical, no electric choke and I beleive single plane intake. I feel it is more for high rpm road racing, give Roush a call or go to their websight and look at their dyno curves. they do not have one for the sr/tw but it mimicks the sr.
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Old 05-08-2008, 03:45 PM
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Cobra Make, Engine: SPF1715, Roush Built 434 ci Stroker, Dart Block, Ported AFR 205 Heads... 561 hp / 547 tq, Former Roush Show Car, Completed and Prepped By Olthoff Racing.
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Congrats on the car, you will love it. Take it easy until you get to know the car well, and then you still must show it a lot of respect. I owned a lot of fast muscle cars and some vettes before my SPF, and nothing compares. The car can get away from you very fast if your not careful. Have fun!!!
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Old 06-02-2008, 04:05 PM
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Cobra Make, Engine: SPO 2813, Roush 427SR/TW
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Well, I paid Wayne a visit in Boise and got to drive his demo with the same engine in it. Had some real fun and took it easy. I did find out that he was doing the sr/tw, so it should be fun.

Wayne has just about everything in, part-wise. The engine should be in this week. The roller is somewhere in the Pacific, probably between Midaway Island and LA. It is due into LA Friday afternoon.

I am crossing my fingers that it doesn't get held up in customs so that Wayne can pick it up next Monday. With a lot of luck, I might be able to get it around 6/22. Otherwise, I will have to wiat until mid July. The wait is the hardest part.
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Old 06-05-2008, 06:08 PM
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Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
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good luck with the new ride.
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off idle drag pass, DA 750ft.

Last edited by greg schroeder; 06-05-2008 at 10:52 PM..
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