Thread: Roush 427 IR
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Old 10-25-2014, 09:28 PM
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twobjshelbys twobjshelbys is offline
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Join Date: Jan 2009
Location: Las Vegas, NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
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I had a IR in my Cobra and a friend has an "R" in his GT40.

They have a really lopey cam, and they don't like to run slow. It will run a little warm if you are just driving on the street. I always tried to run mine in lower gears at higher RPMs to keep it happy. That meant almost all driving except for the freeway was in 2nd or 3rd to keep it above 3K RPM. Then it was "happy". Running higher RPMs keeps the oil temp at water temp (200+) Another choice is to bypass the oil cooler at the front.

P.S. If you are high altitude with the Accel DFI system you need to contact me. I think I have a tune that fixes their high altitude compensation table around somewhere.
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CSX4005LA
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