Advice 408ci W/ F1-A
 

Hey Guys,
So my current set-up is a LQ9 based 408ci. LSA Heads (ported out), Stock LS3 intake/TB and an F1-A on Meth and E85 (and everything else to support that) Current #'s are 1006/961, but i am losing a bunch of top end power from what I think is a blower restriction. Car makes about 13lbs of boost (I'm at 6000ft elevation BTW) and pulls great up to about 5600rpm. After that, its starting to nose off and dip the power. Its on a 3.8 pulley (could be a 3.7, not near the Vette right now) with a 10% over driven IW crank. Anyone else have a similar setup or care to comment before i go to a F1-A-94 R/X. We (tuner and I) think that the blower is maxed, but i called pro-charger and they say that the setup should support 1100 wheel. This is thru a RPM T56 as well FWIW with a 3.42 rear end ratio

Do you think the intake/TB could be the culprit for that? Think its just maxed on flow? Blower over spinning on that set-up? Another thought is the size of the motor is choking the blower

Thanks.
https://cimg0.ibsrv.net/gimg/www.cor...d030671366.jpg

Blower maxed. They're saying 1100 wheel, you're making 1000 at 6000' elevation. That's well beyond their rating.

What we figured, thanks for the input.

You gotta be losing upwards of 20% up there (-/+3% per 1000'), so if that 1000hp you made is at the rear wheels, that's fuggin impressive man! Sick car.

What hood is that??

Thanks. She hurts some feelings. 1006 was to the wheels.
https://cimg4.ibsrv.net/gimg/www.cor...e4d8e8fc74.jpg

TM Style CF Hood from Corvette Mods. https://www.corvettemods.com/C5-Corv...d_p_11455.html

How was the fitment, I kinda likey.

What is redline set at? Curious if I should go f1a or f1d.

indint wasn’t anywhere near 1000hp though.

800 is my limit.

Redline is at 6.5k. Won’t make power past 5.6k. Depends on the size of the motor and power goals for you really. I’m happy with the power just hate giving up 1k rpm in the powerband.

The same as any aftermarket body panel, lol. Frustrating to get fit correctly... it looks great once it’s on and lined up.

Stupid question but any low end torque issues with f1a?

FWIW, I see 1 psi for every 1000' of DA. I would double check the valve train just in case but you are more than likely out of blower.

Not at all with the bigger motor. Plenty of low end torque to be street able down low in the power band.

We just went thru the top end recently before we tuned it. We're almost 100% sure its blower inefficiency.

What your compression?

Thanks a lot for all the info. I appreciate it.

9.5:1

No Problem

Great combo! What does it run in the 1/4 mile?

Best is 10.6 @ 137. That’s with a 8,000ft DA and a 2.1 60 ft. Has a lot more in it, just getting my feet wet with the setup. Only had one track day, needs to stop snowing or raining out here, lol

No doubt you have a lot more in it👍

Can you share any more pics of the car? It’s a sweet looking ride.