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V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters
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Old 02-16-2008, 12:47 PM   #1
massivestunna
 
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Default How much psi fuel pressure?

I've cut off 2 of my cats and installed dual flow master exhaust system. I've added a adjustable fuel regulator. I've amp up the psi to 40, but my tang still intend to lower the rpm and hesitate on take off. I heard some said I can amp up the regulator to 55psi is that pretty cool for my v6 tang? Thanks for the help!
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Old 02-16-2008, 07:35 PM   #2
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Default RE: How much psi fuel pressure?

Unless you are getting a dyno tune each time you do that then you are screwing things up. The more PSI you force in the larger the injector becomes and the closer it gets to reaching max output. Your MAF still thinks you have 21lb injectors but increasing the fuel pressure increases that rating.

Set it back down to 38psi and figure out the problems from there.
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Old 02-17-2008, 10:26 AM   #3
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Default RE: How much psi fuel pressure?

Actually the shop lie to me man. I took my car to a guy I know that works on car. he has a fuel pressure gauage. it was at 20psi. I was like WTF?! So, we amp it back up to 32psi (factory setting) to see what happens. But if the car intends to do the same thing I'll amp the pressure to around 38psi like you said. Thanks for your reply Neo!
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Old 02-17-2008, 02:49 PM   #4
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Default RE: How much psi fuel pressure?

also. do you think it's just best to put back on my 2 other cats then?
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Old 02-17-2008, 02:58 PM   #5
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Default RE: How much psi fuel pressure?

as long as you have two and your state doesnt require them to be in the stock location then you will be fine.

Federal regulations state that the vehicle must have all of its exhaust pass though a cat.
You can get a high flow if you want but make sure it is 50 state legal even if you dont live in California.

Also I think you should set the fuel pressure to 38psi, according to my book that is stock.

good luck

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Old 02-17-2008, 11:21 PM   #6
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Default RE: How much psi fuel pressure?

Yeah, I went back and had my friend amp up the fuel to 38psi. So far no problem. Thanks man!
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Old 02-17-2008, 11:21 PM
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