underpressureWs6

iTrader: (17)

Basically is the F1A-91 worth the extra cash?? anyone have it on here? my D1sc is maxed and will be looking to switch up soon...

Blown06

iTrader: (32)

From what I understand it is well worth the cash.

underpressureWs6

iTrader: (17)

the only difference between the 2 is the Inducer Diameter, the F1A being 3.5 and the F1A-91 being 3.57, i wonder if this alters the fitment in anyway? its going on my '00 WS6 with the truck inlet hat, radiator's not stood up straight.

The Alchemist

iTrader: (19)

Well, the F1a is already a tight fit. I heard the -91 is bigger, so it might be even tighter.

underpressureWs6

iTrader: (17)

according to procharger they're identical except for the inducer diameter

Bob@BruteSpeed

iTrader: (16)

The F1A 91 is being used in coyote modified, that’s what this blower was designed for. The impeller is the same, just with a trimmed down inducer to fit the requirements for the class.

The F-1A 94 is the one to go with, if you want an upgrade over a standard F-1A. It's good for around an extra 150 hp over a standard F-1A, but is softer down low. Bob

The Alchemist

iTrader: (19)

So for a street car, with more low end torque, you'd recommend the older F1-A Bob?

Bob@BruteSpeed

iTrader: (16)

Yes I would, unless it's a light car that already has too much low end power. Thanks. Bob

The Alchemist

iTrader: (19)

That's not my car... it's full weight, plus the blower, plus the intercooler etc. So I'm figuring the 416ci ls3, plus the f1a, should make for some nice midrange torque. I'm using a 4.00" head unit pulley with a 7.65" crank pulley. No clue how much boost that will make.

underpressureWs6

iTrader: (17)

gotcha, i see the inlet hose diameter is a little larger on the F1A-94 so my truck inlet hat wont work with it?

Bob@BruteSpeed

iTrader: (16)

You'll probably be somewhere in the 15 to 16 psi range. Bob

Bob@BruteSpeed

iTrader: (16)

Correct, you'll have to fab one, I'd use thin wall alum tubing. Bob

underpressureWs6

iTrader: (17)

im also using a 7.65 crank pulley so im curious as to which head unit pulley i'd have to use to see 18#'s, with my D1sc now im seeing 18# with a 3.40 head unit pulley

Bob@BruteSpeed

iTrader: (16)

On my 408 with AFR 225 heads and my blower cam, I saw 18 psi with a 3.90 blower pulley and a 7.65 crank pulley. Bob

Bob@BruteSpeed

iTrader: (16)

To determine the impeller speed, the following formula is used:

Maximum impeller speed = crankshaft pulley diameter (N1) divided by supercharger pulley diameter (N2),multiplied by the step-up ratio (4.10 for the P-series/D series - 5.40 for the F series), multiplied by engine rpm at redline.

An F-1A is good for 74,000 rpm. Bob

Troy

iTrader: (10)

What kind of power did that put down? Are you using Methanol?

underpressureWs6

iTrader: (17)

awesome thanks bob! im 365ci, PRC heads, big blower cam, so 3.90 sounds about right for 18#'s

Bob@BruteSpeed

iTrader: (16)

Don't really know as it had a glide with a 5000 stall. No meth. Bob

Bob@BruteSpeed

iTrader: (16)

You're welcome. 3.90 should do it. Bob

underpressureWs6

iTrader: (17)

i ideally want the F1A-94 but if it doesent fit without standing the radiator up and needs a fabbed inlet hat im debating wheather or not to just stick with the standard F1A..... if you think it will fit in direct replacement to my D1sc i'll get it...