MIKE-C5

I am debating to switch my D1SC to a F1R....... Will like to get some input from owners that have had the D1SC and switch to a F1R.

0Jeff @ TPE

Its the difference between a gradual spool up and a swift kick in the nutz. The D1 comes on kind of weak but spools up hard and pulls all the way to the top. The F1R comes on strong (violent) and pulls like a freight train till you let off the throttle (or you pi$$ your pants)

99 C-5 F1C VETTE

your sooooo right american hp, you have a way with words

Mike04

MIKE-C5

Busa196

Damn Mike, isn't your car fast enough yet?

R6_C5_CLS55

I just noticed on ATI's web site that they changed the step-up ratio on the F1R from 5.0 :1 to 5.4 :1. That should make for an even bigger difference in power ramp-up. I don't see the F-1C on their specifications page any more.

Sean

b98

Can you say BOOMMMMMMMM

HIGHRPM

If both internal ratios are pullied to make the same maximum boost... (your preset limit for your motor), then the power ramp up would be the same for both internal ratios. The rampup in power is linear with engine rpm... internal ratio has nothing to do with it. The F1R with the 5.4:1 ratio would use a bigger pulley to achieve the same boost as the F1R with 5.0:1.

0Jeff @ TPE

Cajundude

What would you have to do to your engine to run an F1? Could you do it on a small cubed forged block or do you need a bigger one?

0Jeff @ TPE

I have it on a forged 347ci motor with no problems at all.
With an F1R you MUST have a forged motor and Run 8 rib pullies.

Cajundude

Thanks! Which heads are you using? How much boost? How much HP? Sorry for all the questions but I plan on going with FI in in the next month or two and want to go forged at the beginning of next year to increase the boost. I'm going nuts right now trying to figure out which one to get. I'm kinda waiting to see what the KB is gonna look like price wise.

flatlne

Have you ran it yet ?what is your 1/4 mile times?need to know I to want to p!@@ in my pants

MIKE-C5

I have a D1SC in my stroker Motor (383), with the D1SC I get 12 Lbs. with a 3.85 Pulley.
If I get the F1R, I would adjust the shift points down about 300 RPM......I know the pulleys on the F1R's are also different size than the D1SC

ForcedVette

The F1R, good God.... 8 rib for sure, and maybe an extra support to prevent bracket flex. Is this a street car? The F1R, even at idle sounds like a 747 taxing for take off. I had one on my drag car (68 Camaro 10.5w w/540cid) It ran in the 8's, mild cam, head and blow through carb, at only 15 lbs (Which came on as quick as a Roots or Twin Screw style blower...NO LAG).. Very serious blower. Good Luck...

peter pan

Mike you better get one soon, when Jeffs upgrades his car I want to get his for my car

0Jeff @ TPE

A&A Stage II Heads, 12-13#'s of boost on a 4.5 Pulley, We had it to 755rwhp but turned it back to 690rwhp (687 to be exact) just to see how it worked in Las Vegas heat. I'm actually having it retuned next Sat and should hopefully pull out 775rwhp with pump gas and a healthy dose of Alky. Last time we had it to 755 the alky was still turned down.

Since I have 100 octane avail to me I was thinking about trying it with that as well.

0Jeff @ TPE

Actually the reason he's asking is because he knows I am upgrading and wants it..

MIKE-C5

Its true.....The good thing about this is that I have FIRST BIDS on this F1R...........................