I mildly modded my ride and I´m wondering if a AFPR would be any use for me at this point. Mods include: K&Ns, modified airbox, airfoil, ported plenum & runners, hooker catback.
Would a AFPR be worth 140 bucks at this point, cause that’s what it would cost me since I´m stationed overseas

 

yeah , its worth it. this will add even more horsepower and it will bring the hp and torque curves down. more horsepower at lower rpms. try different psi's. i have my 305 tpi set at 49 psi and i noticed a good different. try it out. def. worth the money.good luck

 

thanks ! .... any ideas how much HP/TQ gain I could expect ???

 

it all depends on what you have done to your engine. the more mods, the more hp gain you will get from it.

 

While higher fuel pressure does promote better atomization of gasoline, the typical TPI 305/350 on a basically stock engine is already pig rich with fuel. The last thing you need is to add more fuel. What you really need to do is shorten the injector PW to get the engine leaner and closer to 12.4-13.0. I wouldn't be surprised if you were running 11:1 right now.

The ultimate solution is to get an AFPR and set the fuel pressure around 46-48psi (don't go too high or you'll burn out your fuel pump) and then compensate within the eprom to get the right mixture.

I would not attribute ANY HP/TQ increase to the AFPR. What you are really doing is "tuning" the engine to what it is optimally capable of producing. Its more like "recovering" what you have lost due to poor tuning. Poor tune is often the reason you will see someone with a lot of "good looking mods" yet they don't seem that much quicker than a "stocker". And a "good tune" is the reason some guys with seemingly little modifications perform so well.

 

Glen91L98GTA you really do know you s**t about eproms and tuning. By the way Glen can I burn proms for a V6 ? Kinda like practice till I get a real car.

 

V6s are funny. Some use the same ECMs as the TPIs, some use a different one. A lot of the 3.1 V6s use the same ECM as the SD TPI cars and the SD BIN does allow for 4, 6 and 8 cylinder operation. The greatest variation tends to be on the MAF cars.

The simplest solution is to convert the ECM of a V6 car to the V8 version IF your car does not use the same ECM as the V8 cars and then modify the BIN. If you are in the Kamloops area, I would be happy to take a quick look and try a "test".