A Couple Questions, Fuel Pressure and Spark Plug Gap. - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 5 Old 07-05-2010, 01:00 AM Thread Starter
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A Couple Questions, Fuel Pressure and Spark Plug Gap.

Ok so a couple quick questions, where should I gap my plugs? Stock 97 4v engine w/ .70 On3 Turbo Kit.
Second question is fuel pressure, my car was originally a returnless car that I am comverting to return. What fuel pressure should I run in just my base tune to get to the tuner? I will not be getting on it or driving in boost (if possible) but have no idea where to set it at just to start and drive the car.
Thanks for the help


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post #2 of 5 Old 07-05-2010, 09:24 AM
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The stock fuel pressure is right at 40lbs, I would start there on the pressure to get it running. Hopefully you have some kind of boost reference for the regulator to up the fuel pressure as boost rises. As far as the plugs, I'd try .035 and see if it breaks up under boost. The gap is going to be something you have to play with depending on what ignition you have, which plugs and how much boost.


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post #3 of 5 Old 07-05-2010, 12:35 PM
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When I was at 8psi I gap mine to .30 with NGK TR6

Voodoo racing innovation built 4v , powerglide, borg warner s475 at 29psi, custome turbo kit , pro efi ecu, Aeromotive fuel pump, aeromotive fuel rails, id 1000 injectors, e85. Best to date 1.36 60'
Best pass to date 8.92 at 156mph. Best 1/8 mile 5.6at 127 mph.
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post #4 of 5 Old 07-05-2010, 02:52 PM
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you have a aeromotive regulator that is probably 1:1 ratio bosst reference. basically you just need to set idle pressure. having a little more is not going to hurt you, what hurts is lack of continuous pressure under boost. your engine usually runs between 38 and 40 psi at idle. the key is to have a bump of 1 psi of fuel to 1 psi of boost. i set my regulator at 40psi. your vacuum line should be hooked up after the throttle body. on the intake somewhere. as for your spark plugs, i would gap them to .030 and go from there. i run NGKTR6 plugs. never had a issue with them.
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post #5 of 5 Old 07-05-2010, 03:17 PM Thread Starter
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Okay thanks guys, I figured 40psi and 30 gap so I guess I was right just wanted to make sure. Thanks again

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