95 Fuel Rail FPR question

david-b · 10-12-2009, 11:24 AM

Hey all;
On my 95 420a build I'm working on I did the mod to the rail to disable the built-in FPR (will be using a 1:1 SFMU). The question is, do I still have to hook the vacuum line from the built-int FPR it the IM if it's disabled?

Thanks!

VelocitàPaola · 10-12-2009, 03:16 PM

Nope, you can leave it disconnected. The stock FPR isn't doing any pressure regulation anymore, it's just plugging the end of the rail so fuel doesn't spill out.

david-b · 10-12-2009, 05:31 PM

Excellent. Thank you.

david-b · 10-13-2009, 02:52 PM

Since I had this thread, I'll ask another question too. I bought the SFMU used off someone and got all the different springs with it. How do I know which spring is what? Is there a 'by the bar' rule or anything specific? It's a Votec (sp)

VelocitàPaola · 10-13-2009, 02:57 PM

Call or email Vortech. They'll be able to tell you which spring/disk does what. You might also try their support website:

Support | Vortech Superchargers

rstare · 10-14-2009, 08:17 AM

You should have 2 or 3 springs, depending on if the original owner order the optional third spring.
The standard spring, which is most likely the one you want to you, is the least stiffest. I believe it's also the shortest spring.
Sorry I can't give you a better definition.

96TurboGS · 10-14-2009, 07:34 PM

This is my current setup and it works great; however, it’s a bit pricey.

If you are using it for a 1:1 AFPR, You need this....

Adapter Ring, Low-gain Ratio (Use with 6Z170-010 or 6Z170-015 for 1:1â??2:1 Gain) | Vortech Superchargers

As the site said you also need either one of these (6Z170-010 or 6Z170-015) in conjunction with the adapter ring.

When its all said and done your looking at the price around an Aeromotive AFPR!!

EDIT: Here is the instruction manual, there are 4 disks and 3 rings for the SFMU. If your using it for MS then disregard the data sheet disk gains.

http://www.vortechsuperchargers.com/...superfmuim.pdf