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Advice 408ci W/ F1-A

 
Old 05-08-2019, 12:59 PM
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CRBN C5
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Default 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.

Last edited by CRBN C5; 05-08-2019 at 02:04 PM.
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Old 05-08-2019, 01:27 PM
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Jackie N
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Blower maxed. They're saying 1100 wheel, you're making 1000 at 6000' elevation. That's well beyond their rating.
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Old 05-08-2019, 01:37 PM
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What we figured, thanks for the input.
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Old 05-08-2019, 01:43 PM
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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.

Last edited by Jackie N; 05-08-2019 at 01:44 PM.
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Old 05-08-2019, 01:45 PM
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What hood is that??
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Old 05-08-2019, 02:00 PM
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Originally Posted by Jackie N View Post
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.

Thanks. She hurts some feelings. 1006 was to the wheels.
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Old 05-08-2019, 02:03 PM
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Originally Posted by 69GTO96Z View Post
What hood is that??
TM Style CF Hood from Corvette Mods. https://www.corvettemods.com/C5-Corv...d_p_11455.html
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Old 05-08-2019, 06:28 PM
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Originally Posted by CRBN C5 View Post
TM Style CF Hood from Corvette Mods. https://www.corvettemods.com/C5-Corv...d_p_11455.html
How was the fitment, I kinda likey.
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Old 05-08-2019, 08:51 PM
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What is redline set at? Curious if I should go f1a or f1d.

indint wasnít anywhere near 1000hp though.

800 is my limit.

Last edited by Nosferatu333; 05-08-2019 at 08:53 PM.
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Old 05-08-2019, 10:21 PM
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Originally Posted by Nosferatu333 View Post
What is redline set at? Curious if I should go f1a or f1d.

indint wasnít anywhere near 1000hp though.

800 is my limit.
Redline is at 6.5k. Wonít make power past 5.6k. Depends on the size of the motor and power goals for you really. Iím happy with the power just hate giving up 1k rpm in the powerband.
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Old 05-08-2019, 10:22 PM
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Originally Posted by ascastil View Post
How was the fitment, I kinda likey.
The same as any aftermarket body panel, lol. Frustrating to get fit correctly... it looks great once itís on and lined up.
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Old 05-09-2019, 10:59 AM
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Originally Posted by CRBN C5 View Post
Redline is at 6.5k. Wonít make power past 5.6k. Depends on the size of the motor and power goals for you really. Iím happy with the power just hate giving up 1k rpm in the powerband.
Stupid question but any low end torque issues with f1a?
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Old 05-09-2019, 11:15 AM
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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.
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Old 05-09-2019, 03:16 PM
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Originally Posted by Nosferatu333 View Post
Stupid question but any low end torque issues with f1a?

Not at all with the bigger motor. Plenty of low end torque to be street able down low in the power band.
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Old 05-09-2019, 03:18 PM
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Originally Posted by algZO6 View Post
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.

We just went thru the top end recently before we tuned it. We're almost 100% sure its blower inefficiency.
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Old 05-09-2019, 03:30 PM
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Originally Posted by CRBN C5 View Post
Not at all with the bigger motor. Plenty of low end torque to be street able down low in the power band.
What your compression?

Thanks a lot for all the info. I appreciate it.
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Old 05-09-2019, 04:27 PM
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Originally Posted by Nosferatu333 View Post
What your compression?

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

9.5:1

No Problem
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Old 05-09-2019, 08:42 PM
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Great combo! What does it run in the 1/4 mile?
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Old 05-09-2019, 09:19 PM
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Originally Posted by 95vettski View Post
Great combo! What does it run in the 1/4 mile?
Best is 10.6 @ 137. Thatís 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
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Old 05-10-2019, 01:07 PM
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Originally Posted by CRBN C5 View Post
Best is 10.6 @ 137. Thatís 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? Itís a sweet looking ride.
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