454SS owners

[keggers]

Any 454SS owners out there? Im having some problems with mine after the following mods; EDEL 2162 cam, EDEL 3764 intake, Hooker Supercomps, JET AFPR set at about 13 psi, true dual 2 1/2's with high flow cats, no muffs, and the timing bumped up. I run a minimum of 91 octane in it. First of all, the performance increase did not satisfy me. I noticed some top end increase, but now when im crusing at anywhere between 20-40 mph and step on it I get a heavy hesitation with an occasional backfire. This is embarrasing and I need some help. Ive pulled the plugs and they look good still.Would a custom burned chip help maybe? Im pretty stumped guys and could use some help ASAP as its getting close to crusing season.

[Frankenbiker]

Bump your fuel pressure as high as you can go; 15-18 at minimum, I'd say at first... Your cam/intake/headers increased your volumetric efficiency, so you're pulling more air through the motor than the injectors can fuel on the stock chip. Bump your fuel pressure till you can get a chip burned for it. The factory chip can't keep up with the demands placed by the upgrades.

By increasing the fuel pressure, you're increasing your flow in lbs/hr, and perhaps the factory chip's base pulse width (i.e. how long it holds the injectors open) will be sufficient, at least to keep it in daily-driver status. A new chip WILL be required to get the most out of the mods.

-blaine

[454ss]

Check if distributer is loose, also bad gasket under the TBI will cause backfire and hesitation....I ran 13.5 fuel pressure at 12* BTDC timing with that set up and it ran perfect.

[keggers]

Thanks for the help guys! I will be sure to check the distributor, gonna have to wait on the chip until I can afford both it and a bored out TB.

[454ss]

Check out Brian from http://www.tbichips.com he makes up custom chips at a very fair price he's done a few for me.