External links now open in a new browser tab - turn this off in your UCP - Read more here.

FMU aeromotive

Discussion pertaining to positive pressure E28s.
Post Reply
g00b86
Posts: 78
Joined: Feb 04, 2007 11:09 AM

FMU aeromotive

Post by g00b86 »

I came across a good deal for an aeromotive FMU for my project, but i am unsure if it meets the requirements for a low boost set up... heres the info from the site and a link
http://www.aeromotiveinc.com/products.p ... =1&prod=10

*Base pressure (vacuum/boost disconnected) adjustable from 40 to 75 PSI. *Two -10 AN inlet ports, one -6 AN return port and 1/8" NPT gauge port *Alcohol compatible. *Fuel Pressure will rise on a 1:1 ratio when referencing boost. *Aeromotive regulators beat the competition with the best of all worlds: Outstanding, consistent performance from equipment that’s built to last. Aeromotive delivers more flow than similar regulators thanks to a custom, convoluted diaphragm that maximizes piston stroke while minimizing stress. Every model uses a poppet designed specifically for that regulator, and a diaphragm fabricated from a proprietary elastomer material. The standard vacuum boost port delivers perfect 1:1 boost reference and makes these regulators ideal for turbo-charged and supercharged engines.

can anyone shed some light for me?
turbodan
Posts: 9246
Joined: Jan 09, 2007 10:19 PM

Post by turbodan »

You'll need more than a 1:1 rate for a turbocharged motor. You'll probably be needing something between 4:1 and 8:1. I used a BEGi RRFPR, which uses a bleed screw to set the rate of fuel pressure increase. Since its infinitely variable, I dont know what the actual ratio I had used actually was. Other regulators like the Vortech RRFPR use different discs for different ratios.

You can get a good BEGi 2025 for 125-150 on ebay.
g00b86
Posts: 78
Joined: Feb 04, 2007 11:09 AM

...

Post by g00b86 »

hey thanks,
yes i am quite familar with begi units.. thats what the standard is but i just came across this one relatively cheap on the bay as well and was unsure since it said alot about boost referencing i thought perhaps it would have been sufficent in terms of the aditional fuel beyond the 1:1 ratio. I know the vortech ones and the likes are usually just a standard 12:1 ratio or what ever and that a rising rate is needed. Ive been stalking out begi's for a while and every time i get out bid at the last second while i have to be in class or something. id like to spend around 100 for one so when they get as high as a new one is i usually back off. Thanks though for filling me in and letting me know this one is no good. Ive got a few ending in a hr and another ending in 7 that ill be stalking out today... wish me luck.
g00b86
Posts: 78
Joined: Feb 04, 2007 11:09 AM

Post by g00b86 »

The only other option is either a 2025 or a 2027 correct? I am under the impression no other unit will work.
turbodan
Posts: 9246
Joined: Jan 09, 2007 10:19 PM

Post by turbodan »

Thats pretty much correct. You can use one of thier MR regulators if you want to reduce static fuel pressure, which is a handy adjustment, but you'll pay more.

The only difference between the 2025 and 2027 is the size of the fuel line fittings. No big deal, but the 2025 uses more appropriate fittings for BMW fuel line. You probably knew that already though.
g00b86
Posts: 78
Joined: Feb 04, 2007 11:09 AM

Post by g00b86 »

correct... thanks turbodan..
Post Reply