Hey guys,

I am pretty new to TPI, so I do not know the ins and outs. I am doing a few modifications to my 89 iroc 350, and had a question about the adjustable fuel pressure regulator. I have to put intake gaskets on the car, so I figured I might as well install an AFPR. Especially since I am adding some performance parts while I'm at it. Let me tell you guys what else I'm putting on.

Edelbrock TFS Shorty Headers
3" catco converter
3" Hooker Aerochamber cat-back
Underdrive pulleys
Probably an air foil
And probably modify the air intake (not intake manifold) in some way to achieve better flow.

My question is, where should I set the AFPR to get a good starting point with these changes to the car? From what I've found on the boards, its kind of a trial and error thing to tune, and is not an exact science. I was hoping that someone with some experience may be able to give me some tips to save me a little time before I tear into it. Thanks guys.

 

I have the same setup on my GTA except i have no cat's and it sounds great!I would set it at 44-46 psi first,that is the factory setting then bump it up as needed and you will be fine.

 

check out http://87tagta.tripod.com/coldair.htm

 

50lbs sounds good for a 350. start there, you shouldnt need to increase it ne more than that. and i hope you got urself a good regulator like this one.

http://www.jegs.com/webapp/wcs/store...46177_-1_11175

 

I was planning on getting a BBK. I have heard that they are good for the money. I also heard to stay away from the holley ones.

 

the BBK one is good, just make sure you can get one with the security torx tool. i noticed i gave you the wrong link, the better and cheaper one is the cranecams one (i have that one). http://www.jegs.com/webapp/wcs/store...46141_-1_11175
im sure you can pick up that special tool at the parts store too tho.

 

Just curious but why is the Crane better than BBK?

 

only because the kit comes with the tool, the other kit does not. thats y...but basically, every regulator will be the same because its just a piece of aluminum with a screw on the top.

 

The Holley is nice, large dail on the top so you can just turn with your fingers + you get a new diaphram. Got mine from Summit last week for $89, a little more pricey, but you get a new diaphram. My car's 20 years old, so it sounded like a good idea to replace it anyway (the diaphram). Do a search, I've read of the vacum tube falling off on some of the others. But as always, I could be wrong. Good Luck!!

 

I bought a Holley also, I loved the look, thats what sold me on it. But I have had no issues with mine at all.

 

Not happy with my Holley...the finger dial hits the bottom of the plenum. Save your money and stick a dime under the stock regulator cover. This increases the spring pressure to raise the fuel pressure a bit. Cost effective. Also I would try 47 psi. For an 89 that is the stock setting. If you go higher then you burn the injectors up ssoner as the injector is trying to close against higher fuel pressures.