How many psi are you running with your adjustable fuel pressure regulator? I ordered one and plan on instaling it. I know what pressure I am at now, so I can always change it back to original. I would appreciate any experience or ideas on how to "tune" it without having to use a dyno each time.

 

Every car is different. Start where you are now and go from there. Read the spark plugs, go to the track and tune by MPH

 

TPIS recomends anywere from 46-50. I am running 48psi in my car and I notcied a really big diference since it was originally at 34psi when I checked it.

 

WOAH!!! Mine was at 44 psi when I did my test, I triple checked it. But I had just installed a new fuel pump and pulsator + fixed other goodies. I just got my BBK regulator and the instructions recommended cranking it up 6 psi to start with and then do 1psi increases at a time till you dont notice any performance gains. Then lower it 1 psi to where you had it last. They you are supposed to lower it 1 psi at a time till you drop in performance again. Then set the psi in the middle of the low and high number. I guess thats a good way to start

 

Well...the instructions only apply if you aren't going to do any actual tuning to the chip. I would simply set it at 45-46 psi and leave it...then tune the chip around it.

 

Nah, Im not ready to invest in chip programing yet. I believe the gm upgrade chip part #1228291 calibration 3.670 I bought is flexible enough for my mods, especialy since im sticking with a 305 and L69 heads. I could not believe that my car was running 44 psi stock! The 86 tpi cars supposedly ran around 37-43 psi. I also did some research and found out that it is recommended to disconnect and block off the regulator vacum connections to get an accurate reading when you adjust. For now the adjustable regulator is easier for me to tune than a custom chip.

 

I checked mine out and it sits right on 49. I recalculated the 22# injectors to about 26 in the bin and its running real good there.
I have some more VE to work on to get it just right then onto PE.

 

When you are ready, you'll then get to see what you've been missing out on.
The old stock cals are just good enough for some bean counters to sign off on, and meet the EPA regs. After driving a car with a fully optimized calibration, and you'll see how bad they were.

 

I would be ready for that when I have all the other engine type mods done for my car. I am not up to tuning a chip each time I make a mod, so I want to save that frontier for last, less variables to mess with each time. I am still running a unmolested 305 block. I have a replacment motor and heads that are part way done but I dont have a need for them yet. The old motor still runs good, instead I have been spending money and time on repairs restoration and external mods. I do think there is a lot to gain by tuning a prom but I have many other areas that need attention first, lots of old stuff to fix or change.:hail:

 

i set mine a 48 psi. i definatly feel the difference then with my original one.