The problem with putting a F series blower on a stock bottom end, is that there is more airflow all the time. The transmission inside it steps it up faster so there will be more power everywhere. I havent really heard of people putting a f1 on a stock 346. Im guessing a 5" may be too much also, possibly a custom under-drive crank pulley.

As for CI, a d1sc will work on a low 400ci motor but it will be running out of breath. If you go this route, meth and a fmic is required to keep the soaring IAT's down.

One possible route is to get a d1sc, then sell it when you get the new motor going. The d1sc usualy sells alot better then a p1 due to its power range.

 

Back from the dead...

Has anyone done this yet? I am considering it but no good results from searching.

Also, what is the smallest crank pulley I can get to keep the boost down along with the 5" blower pulley?

I have a 235/243 @ 110+2 cam so that should help bleed some boost too.

 

lol, old thread..

F1A with a 7.25/4" pulley on a 347 with a 232/242 114 cam a couple years ago:

http://videos.streetfire.net/video/8...ger_710762.htm

 

A friend here did it, forged stock cubes, F1A at 15psi through a yank 3400 stall, built 4l60e and a 9" with 3.50 gears. Car put down 810 rwhp corrected and for a full weight street only car with a soft launch on worn *** nitto 315s car went 11.4 at 131mph up here at bandimere 5800ft elevation. Car was consistent all night.

 

I was planning on putting an F1 on my car in a year or so. Since I have a P1SC now I figured I would just get a FMIC and F1 at the same time. My motor is forged though and I already have meth installed and the other usual fuel mods for more boost.

 

kp what boost do you think I would see at 6k rpm with the 7.25" crank and 5" blower pulley with the f1a in a 347 with the 235/243@110 cam? I want to keep it down under 8lbs so my stocker has a chance. And yes I will be upgrading to more cubes soon, hence the f1a. Can the bypass valve function to keep boost down at all or do I just need to underdrive it with the pulleys? I dont think they make pulleys to spin it slower than 7.25/5.

 

thats spinning the blower almost 47000 rpm theirs no way that will only be 8psi
im not sure but i would say u will be well in the teens on boost if not pushing on 20 with a bone stock engine min. cam

 

I dont think you can fit a 5" on a SDCE, I had to do a lot of grinding just to put a 4.25 on.

Its really hard to say what the boost will be until you try it, you can always restrict the inlet. I dont think you will get it to 8psi with a 5" pulley.

 

108 degree LSA ftw! lol

 

Bringing this one back from the dead again. I plan on putting a F1 on my next LS1 while I build up or buy a 408 or 427. I'm gonna be doing a cam swap and usual bolt-ons and thinking of a cam in the 24x 24x or 24x 25x with roughly .610 lift on a 110lsa. I'm planning on that cam size whether or not I end up putting a Procharger on it or not. Just wondering if those size cams will bleed off enough pressre to let the bottom end live long enough under normal driving conditions.

 

Combine a big cam with a 5.25 blower pulley and you'll get the boost down to where the stock bottom end can survive. Bob

 

Thanks Bob. I've seen 5" pulleys, didn't know there were 5.25" out there. I think that'll work good since I don't drive like a maniac anymore..atleast until the built engine is ready that is I'll be giving you a call once I pick up my new project

 

Sounds good, thanks! Bob

 

As a word of note, since I noticed KP mentioned having to grind on the bracket to get larger pulleys to fit, and seen this on other's brackets.

If for any reason you think you need to grind on the bracket then you are using the wrong shim size between the head unit and the supercharger pulley. Any questions on this please contact Procharger before cutting away material, they can provide the two .1" shims (total of .2" between pulley and blower) to put the pulley in the correct spot to clear the bracket and line up correctly with the other pulleys in the system.