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UpRev tune on Mustang dyno with exhaust and intake.

Originally Posted by Chan Chee Hoe So lean.?I set it to 12.5:1,the car sound noisy & less power,then set it back to 11.0:1,the power came back,my standard map is 10.5:1.

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Old 01-24-2013, 08:56 AM   #18 (permalink)
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Originally Posted by Chan Chee Hoe View Post
So lean.?I set it to 12.5:1,the car sound noisy & less power,then set it back to 11.0:1,the power came back,my standard map is 10.5:1.
Lordy lord!

12.6-12.8 is the sweet spot for the VQ37 when naturally aspirated.

Just so you know, 10.5 is hideously rich for a N/A motor. You're blowing clouds of gasoline out your tail pipes.

If you still have cats, you're getting those puppies up to some serious temps by blowing that much fuel into them. They'll burn out pretty fast at that rate, if they don't fail outright from overheating.

Edit: That said, if your car only feels like it's running right @ 10.5, you should probably do some logging and figure out what is going on. If the car is pulling a lot of timing @ 12.5+ you might have something very, very wrong with your engine.
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