Which FAST intake for me?

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Feb 15, 2007 | 05:22 PM

Hemi Killer

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From: Bossier City, LA

Which FAST intake for me?

I keep debating and feel like I'll be loosing a little bit either way I go. I feel like if I go with the 78mm, I'll be leaving some power on the table. Then, I feel like if I go with the 90mm, I'll be leaving some driveability on the table. With my mods (383 LS1/Full Bolt-ons/Full exhaust w/ cats) and truck (Daily Driver, 250-350 miles a week) which one would guys get? I'm gonna be getting one from Vengence new and ported. I just don't want to loose any low-end, like 3000 rpms and under. Then, just gain above 5000 rpms.

Last edited by Hemi Killer; Feb 15, 2007 at 05:31 PM.

Feb 15, 2007 | 05:25 PM

brad8266

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From: Watertown, NY

90/90 FTW, a 78 will be kind of choking a 383.

Feb 15, 2007 | 05:30 PM

black01_WS6

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From: Fort Myers, FL.

get the 90 hands down. I wouldn't even consider getting a 78 with your setup.

Feb 15, 2007 | 06:25 PM

1997bird

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From: Aztec, NM

90/90
https://ls1tech.com/forums/advanced-engineering-tech/631476-can-you-over-throttlebody-efi-motor.html

Feb 15, 2007 | 09:27 PM

Hemi Killer

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From: Bossier City, LA

So, I should be okay with the 90/90 set-up, considering my very mild cam/head set-up? What's another alternative to the FAST 90mm Throttle body? I heard the 90mm FAST ones suck and have problems. BTW, how many cfm is the stock (75mm), 78mm, and 90mm throttle bodies?

Also, do you car guys have to modify anything when you swap over to one of these intakes or does it bolt on exactly like the LS6? I'm asking because I know what I need to do the LS6 intake swap, just not sure about the FAST intake swap on a truck. Thanks!