Hi everyone, its me jose, i just installed a fuel pressure regulator today on my car in place for the stock check valve , it goes from 1/2 psi to 5 and 1/2 psi, i was just wonderin, what shoud i run it at??or what are u guys running urs at?? if u wanna know my mods(which arent much) they are on my sig if it helps. Thanks everyone

 

I have a Weber 48 dcoe. FPR set @ 4.5

 

really??is that enough for that bad boy?? well i wouldnt know anyways. I just have a regular nikki and im gonna be doing mechanical secondaries, but for now i was just wonderin wat shoul i put mine at?? i have it at 4.5 right now too but should i go up or down??

 

That should be good.

 

ok thanks latin.

 

With my old Yaw Nikki,which was a modified stock carb,I ran a Holley low pressure regulator at around 2.5 to 3 psi.That was Paul Yaw's recommendation and it ran awesome like that.
Thats all the pressure you really need,provided you run a high volume pump,like the Carter 7lb unit.

 

ive got a stock pump, i think from mazda trix

 

carter pump, stock nikki, 3.25 psi seems like it is a little too much at times too.

 

holley red, dellorto, and upgraded hardline from pump: runnin 3psi

 

thata funny story about that. lol. i have a purolator pump(i think, its some piece of junk i threw on there cause i cant use my walbro 255 yet). anyway, i have a mallory fpr the boost reference kind. and no matter what i adjust my setting at, the fuel pressure wont go over like 2 psi at most!!

now keep in mind i have a larger return line, and the restrictor in has been removed. but when i had it warming up yesterday, i watched my fuel presure gauge, which is right on the fpr, it was just a little jumpy, but it sat right around 0 psi lol, but the car doesnt have any problem with getting fuel, i just think i have removed all of the restrictions, so i cant get my fuels pressure up. but the car pulls fine, and doesnt empty the bowls at all, if anyone would care to make an opinion on this, go ahead.

 

I have a nikki carb on my car with a holley blue fuel pump and i dont run it over 3.5 psi because otherwise it loads up right away. i don't run under 3 psi because then my car detonates over 6500 rpm. Never good to see 4 gounding tips on one spark plug melted to the electrode with the porceline cracked in 6 places......... i could be wrong........

 

2psi.

This has proved to give me the best quarter mile acceleration as well as half-decent fuel economy, in conjunction with the straight through exhaust, timing alteration, and driver habits. In addition, no annoying bogs or stutters while cornering, even when cornering and bouncing all over the damn place because of the shitty local roads, center dividers in the way, etc. (If I was supposed to avoid it, why was it placed in the middle of my cornering line? )

As they say, your mileage may vary, and testing is the only way you can find out what YOUR situation wants.

 

2.5 to 3 psi... I've tried both, but haven't had enough time to decide where I want it to be. For now it's exactly 3.0 psi

Jon

 

oo, interesting, obviously everyone is different, but did any of u remove ur return line in the process of installing the fpr, or after?? i know some people remove it. if so is it better not to have a return and how do u do it??do u just remove the line and plug the carb fittin??Thanks for all the info by the way

 

I have a 45DCOE set at 4.5psi with no return line with larger diam fuel lines.....

 

Keep in mind that unless one is running a good quality calibrated gauge, then your gauge should be use as a reference, not a true measurement.

 

i dont have a gauge, i have a dial on my fpr so i dont know if its accurate.