08-24-2006, 02:55 PM
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CC Member
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Join Date: Feb 2003
Location: Morgan Hill,
CA
Cobra Make, Engine: SPF 2293, Roush 427R-228
Posts: 298
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Not Ranked
Well I spent the morning over at Mustang Ranch. Great bunch of guys, thanks Byron for the recommendation.
My motor is a Roush 427W with dual plane manifold and a 4bbl. Motor was 531hp and 525tq on the engine stand at Roush.
Final numbers at the wheels after rejetting 422hp and 439tq. The AF was almost spot on above 4k RPM when we started but it was lean below that. After some tuning by Joe it's running much better, and picked up 20ft-lbs of torque.
Definetely not cheap, but I'm very glad to know the motor is safe and no longer lean.
Interestingly the numbers I got seem a lot lower than Scott Performance Dastek Dyno, but very much in line with the traditional 20% loss formula. In any case if anyone else is looking to have their car tuned on the chassis dyno these guys seemed very knowledgable.
Daryl
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