Ketchmi

So there Mike, thanks Matt...

Who's confusing who? The BEGI works along the same lines as the Vortech FMU that Tim Murphy uses in his kits.

The Adjustable Rising Rate Fuel Pressure Regulator does exactly that, regulates the fuel pressure and will decrease as well as increase fuel pressure. I used one on a FAST kit that ran 5psi with 30# injectors and it worked fine for the application. I also use them daily for fuel tuning on cars with exhaust mods. I have one on a GTS that has 30# injectors and no supercharger...yet.

BrianG

Dave and Matt:
I think that Mike is correct on this one......

If you use the BEGI in series with the OEM FPR the lowest system pressure is going to be determined by the smallest orifice (greatest restriction) in the system.

If I read this right......... the OEM FPR cannot reduce the fuel pressure beyond "X". Regardless of how low the BEGI restriction can get, the determining factor for LOWEST pressure will always be "X", as determined by the OEM FPR.

Unless I miss my guess, Dave, your experience is with the FMU/BEGI alone, without a stock FPR in the line?

Sab

My car sometimes goes into limp mode. It is rare and only happens during idle and a restart resolves it. Has anyone else had this? We saw this issue on both GT's with the Jag/Eaton setup.

Jim_H

First I have heard of this. Does Cameron's still do it?

mspiegle

Dave,
The BELL 2025 is a "piggy back regulator". It is designed to work in line after the stock regulator it DOES NOT/NOT DESIGNED TO set baseline fuel pressure. Baseline or off boost fuel pressure is still controlled by the STOCK regulator.

Here is a clear and concise statement probably written by Corky Bell about the BEGI 2025 from http://www.bellengineering.net/Pages/products_FPR.html

"The BEGi standard rising-rate regulators are designed to increase fuel pressure and fuel flow in a fuel injection system by augmenting the factory fuel pressure regulator. These regulators must be used in conjunction with a factory regulator, which provides the base fuel pressure (the fuel pressure at fuel rail during idle conditions). "

Edit, for those visiting the link do not confuse the 2035 with the
(multi role) MR2035 different animal all together.

FlyingDog

You need an fpr in line with an FMU. The FMU only operates or adjusts the pressure under boost. With no boost or under vacuum the FMU escentially goes wide open, that is why you still need an fpr. Mike said the BEGI cannot reduce pressure. He is correct that the BEGI does not reduce pressure... the fpr does.

edit: a standalone RRFPR can reduce fuel pressure like any fpr, and be rising rate under boost like an FMU. The BEGI is an FMU.

...and Mike types faster than me.

Sab

Hi Jim, Cameron's does it as well.

BrianG

Mike, any idea why Andy doesn't like the MR2035? It would clean up that side of the engine a lot!

Jim_H

Do you have an AF meter?

Sab

yes.

Jim_H

And it doesn't show you're overly rich at idle?

mspiegle

The MR2035 is difficult to adjust because the baseline and onset pressures are not totally seperate. It's quite large and odd to mount as well. It was tried and the results using #30 injectors, an 85-86 fpr and the 2025 were superior for the 87+ cars.

Sab

I find it only useful at acceleration, since at idle or cruise it seems to just hunt up and down. The car does not seem to run rich at idle though.
It shortly drops to red or off the scale on tip in, but then goes rich at full throttle.
It idles perfect, just once in a while it seems to jump into 4 cylinder mode. It happened a couple of times on a very hot DE / track event idling at extreme heat in the pit area.

Bill Ball

Daryl:

8 PSI. No wonder you are having traction problems. With those AF ratios, looks like you are doing fine as is. Maybe because your car is an S4 rather than GT there are no tip-in issues at this boost level, and as Louie has pointed out, fuel is not really the issue there.

heinrich

You know Brian, I am 100% sure when I built mine, I remember pulling and swapping both, and the S4 unit fit fine. I also remember Andy telling me I needed the S4 unit on the 85 throttle body. Guess I remembered wrong sorry Dude.