Is this B&M AFPR a bad idea?

[ChrisNelson]

Is this AFPR a bad idea? I wasn't sure what the reason is that the stock FPR needs to be upgraded, but this one just uses the bottom half of the stock regulator:

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The directions are very specific for it:

You take the stock pressure regulator, take a hacksaw to the top half and install this "cap" on top of it.

So, I guess my question is, what is the weak point of the stock FPR? The outlet or the spring rate?

from the website:
"Properly tune your air/fuel ratio.
These B&M Command Flo fuel pressure modifiers allow the fuel flow rate to be modified so you can tune your air/fuel ratio, and are ideal for use with free-flowing intakes and exhaust systems. They feature a bolt-on adjustable modifier for stock fuel regulators, a CNC-machined 6061-T6 billet aluminum case, and they allow pressure adjustments from 25-60 psi. "

 

[Pure92TSi]

The problem with the B&M is that you can't lower fuel pressure only raise it and with you running the 255 you most likely need to lower your base fuel pressure.

 

[steve]

From the FAQ forum.
http://www.dsmtuners.com/forums/showthread.php?t=186834

Steve

 

[ChrisNelson]

Ok, thanks for the replies guys, but I am curious to why the description about the B&M says that it can control pressure from 25-60 psi? Isn't 25psi less than 43psi? Doesn't that mean that I can lower it from 43 to 25?

I am going to start shopping for a different AFPR now, but I just am curious as to what is stopping it from lowering the fuel pressure.

Thanks!
Your posts have been rated.

 

[Pure92TSi]

It might say that because the B&M is also for use on some hondas and that might be what their base fuel pressure is. Also i would suggest Import Evolution for a different AFPR they have a really good Aeromotive kit at a great price and they also have the Full Throttle Speed AFPR, which is a direct bolt on, in stock. Good luck.

 

[93 GSX TURBO]

you can lower your fuel pressure with the b+M. i know this because i have one on my car and i had to lower it because i also us a 255 with 450s on my A/T GSX. i currently have mine set at 30psi. but if you really want to go in to tunning i suggest getting something like aeromotive or SX AFPR. i know alot will say no, but ask them if they have ever actually used one.

 

[ChrisNelson]

Thanks for the input guys, according to what '93 GSX Turbo' says, I'm just going to stick with my B&M for a while to see how it works out.

It's on the car, but the car is not running yet. After I get it together and try it out, I'll post about it here.

 

[doug]

How are you going to know if your fuel pressure is correct? There's no place on this unit to connect a fuel pressure gauge. Do you have one connected somewhere else?

 

[ChrisNelson]

well... If you look at my profile, it says that I have the AEM fuel rail, and it just so happens that the fuel gauge that I have listed in my profile as well is installed on the AEM fuel rail because that's how they designed it.

So, yes, I have a fuel pressure gauge. Thanks for the concern!

 

[doug]

well... If you look at my profile, it says that I have the AEM fuel rail, and it just so happens that the fuel gauge that I have listed in my profile as well is installed on the AEM fuel rail because that's how they designed it.

Oops-- sorry about that.

 

[Jafro]

I did that on my setup... (B&M gauge on the AEM fuel rail). My fuel pressure gauge lasted less than a week on there. It didn't like being mounted on the rail. Too much fluid vibration. I think the pulsing of the injectors caused it to spring itself because it twitched violently when the car was running. Now it stays pegged all the way around and back to zero even when the car is off.

So after the first time you get it set properly, leave it. My gauge changed readings makin me think my FP was off when it wasn't.

I did AN lines to/from the tank, so I couldn't install it on the filter. I might add a union for my next gauge and plug up the port on the rail.

 

[93 GSX TURBO]

i have a gauge mounted on the line coming from the fuel filter to the rail.

 

[my98gsx]

I have the B&M fuel pressure regualtor on my 1998 GSX and i love it. You can mount the gauge right off of your fuel filter by your battery and it works great. I am a strog beliver in this product concitering i made 8 whp on my friends car on a local dyno just by tuning the fuel pressure on his car so i know for a fact that it works. 8whp for $30-$40? that to my is worth it. Your going to like it, just keep playing with it untill u find your cars "sweet spot" youll know by how the car runs.