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Throttle Body Size

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Old 05-12-2010, 01:44 PM   #1
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Default Throttle Body Size

Building a LQ4 and I plan to use the LS6 intake, mild cam and kit, after market injectors etc to run about 450. But I dont know jack s*** about these throttle bodies Whos is better? What size? What small mods you can make for them? Can someone help me and explain which one may benefit my application the best.
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Old 05-12-2010, 02:01 PM   #2
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If you are hell bent on running the LS6 intake then just port a stock LS1 throttle body and save money.

If you've got the cash then I would upgrade to a FAST. There is a FAST 90/90 combo(intake/throttle body) in the classifieds for $750
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Old 05-13-2010, 12:14 AM   #3
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Got ya. Just bought motor, PCM and wiring harness so the fast intake and tb will have to wait but I have considered it. You from KY?
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Old 05-13-2010, 01:50 PM   #4
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I'm in SE Ohio but can be across the river in 5 minutes
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Old 05-14-2010, 03:13 PM   #5
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Which intake/tb setup do you run?
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Old 05-14-2010, 05:26 PM   #6
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On my old '02 Z28 I had a LS6 intake with a stock throttle body

On my '02 CETA I ran the LS6 intake/ stock throttle body then went to a FAST 90/90. It now has a Victor Jr with a carb

My daily driver '00 Z28 has a LS6 intake and stock throttle body as well
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Old 05-15-2010, 12:43 AM   #7
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Quote:
Originally Posted by Z28/2002 View Post
On my old '02 Z28 I had a LS6 intake with a stock throttle body

On my '02 CETA I ran the LS6 intake/ stock throttle body then went to a FAST 90/90. It now has a Victor Jr with a carb

My daily driver '00 Z28 has a LS6 intake and stock throttle body as well
Ever tried just a stock tb but ported?
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Old 05-15-2010, 07:10 AM   #8
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With LS6 your basically stuck with a 75mm throttle body

I would find a FAST 92mm or FAST 102mm intake and use a 92mm Throttle body.
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Old 05-15-2010, 02:59 PM   #9
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its going to be tough making 450 to the rear without heads too man.. good luck.. best bet to maximize your current setup is a FAST 90 or 92 intake and a Nick Williams throttle body to match. FWIW you can get the intake and tb for around $900-1000 depending.
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Old 05-16-2010, 08:56 AM   #10
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With L92 heads 450's gna b hard?
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Old 05-16-2010, 09:24 AM   #11
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With L92 heads 450's gna b hard?
huh??

this isnt a text message board, spell and use english....
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Old 05-16-2010, 09:31 AM   #12
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Quote:
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huh??

this isnt a text message board, spell and use english....
I have an LQ4 I am going to use L92 heads with. Installing a good size cam, LS6 intake, full length headers, larger injectors and aftermarket fuel rails. ^^^ said its going to be hard to reach 450. I was asking, is this really going to be hard to reach my goal with that build?
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Old 05-16-2010, 06:01 PM   #13
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I have a buddy that ports them but never had the time to take it off the car and let him have at it before I moved
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