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  #1 (permalink)  
Old October 6th, 2008, 07:37 AM
BetMinesFaster's Avatar
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What size throttle bodys are the stage guys running?
Hey guys, got a dumb question, what size throttle bodies are you bigger inch stage guys running? Im looking at a new project and im trying to collect some info, Thanks Ryan
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Last edited by BetMinesFaster : October 6th, 2008 at 08:28 AM.
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  #2 (permalink)  
Old October 6th, 2008, 04:33 PM
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I'm running a 90mm Acufab T.B.

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  #3 (permalink)  
Old October 6th, 2008, 05:16 PM
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Im building a healthy 4.3 with a 76GTQ turbo, tryin to decide what size tb to go with.....im thinking 80 and be done with it.....
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New forged 428" LSX/4L80 in the works for some-tim'ish in late 09 Bowtie LSX block - World Warhawk 6 bolt heads - Callies crank and rods - Diamond Pistions - 99 4L80E built with a Yank 3400 10" stall - Fast LSX 92 intake - Fast XFI - Dual nozzle methanol - Precision PT101 - RJC Megacooler - Aeromotive pump with - 10 feed - drop sump fuel cell - and alotta time and money

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Old October 6th, 2008, 06:07 PM
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Quote:
Originally Posted by BetMinesFaster View Post
Hey guys, got a dumb question, what size throttle bodies are you bigger inch stage guys running? Im looking at a new project and im trying to collect some info, Thanks Ryan
You can easily calculate what you need based on the ci and speed of the engine. The flow of a TB is determined by its cross sectional area. Thats all that really matters. Not if its and aftermarket block or not. No need to go bigger than needed especially for street cars (especially on the small ci we run) since the added flow will cause a loss of velocity in the intake and cause lean outs without added pump shot.
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Blue GN: Old combo 559whp/706wtq. New buildup to come with race ported GN 1 heads and intake .
Black GN:Stock 147k shortblock except cam ,KB 70 mm TB and plenum, ported irons 1.77in 1.5ex, RJC head gaskets, ported stock intake, 212-212 comp roller, 1.65 T&D's, RJC powerplate, 1" plenum spacer, 83 lb/hr injectors, double pumper, FAST XFI, G-Body FMIC, welded ported stock manifolds, 3.5 dp, CPT 66BB GTQ, PAC dual nozzle alky injection, Dusty PTC 9.5", 200 4-R by me with billet shafted forward drum, billet input, billet ring gear and planet. 8.5 rear with Auburn, 28 spline Moser axles, and LPW girdle. 10.29@133.46mph .Time with old combo (stock ecm, p-trim turbo, and loose converter) 10.88@126mph. Stage II coming soon .
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Old October 6th, 2008, 06:30 PM
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A 274ci engine only uses about 630cfm at 8000 rpm with no pressure drop. Looks like a 70mm is more than enough for almost all but the most serious race applications. It certainly isnt a problem on an 800hp or less blow through set up.
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Blue GN: Old combo 559whp/706wtq. New buildup to come with race ported GN 1 heads and intake .
Black GN:Stock 147k shortblock except cam ,KB 70 mm TB and plenum, ported irons 1.77in 1.5ex, RJC head gaskets, ported stock intake, 212-212 comp roller, 1.65 T&D's, RJC powerplate, 1" plenum spacer, 83 lb/hr injectors, double pumper, FAST XFI, G-Body FMIC, welded ported stock manifolds, 3.5 dp, CPT 66BB GTQ, PAC dual nozzle alky injection, Dusty PTC 9.5", 200 4-R by me with billet shafted forward drum, billet input, billet ring gear and planet. 8.5 rear with Auburn, 28 spline Moser axles, and LPW girdle. 10.29@133.46mph .Time with old combo (stock ecm, p-trim turbo, and loose converter) 10.88@126mph. Stage II coming soon .
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Old October 6th, 2008, 06:34 PM
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Here's some data:

Flow Data

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Old October 6th, 2008, 07:06 PM
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Thanks for the info guys, Thats the suff I was looking for!
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New forged 428" LSX/4L80 in the works for some-tim'ish in late 09 Bowtie LSX block - World Warhawk 6 bolt heads - Callies crank and rods - Diamond Pistions - 99 4L80E built with a Yank 3400 10" stall - Fast LSX 92 intake - Fast XFI - Dual nozzle methanol - Precision PT101 - RJC Megacooler - Aeromotive pump with - 10 feed - drop sump fuel cell - and alotta time and money

1986 Grand National - Turbo LSX conversion and all the goodies to make it work.......

Visit my Myspace page, always looking for Turbo Buick friends...

www.myspace.com/rysfly
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  #8 (permalink)  
Old October 8th, 2008, 10:14 AM
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300 feet per second flow through the throttle body should be the max rate. If you use that to calculate your TB size, you may find that you need bigger than you think. I went 100mm. One of the main reasons for that decision was the way air enters our manifolds. Too bad we couldn't have the air enter straight down. With the way air enters the plenum I wanted to slow the speed down to control turbulence that may occur feeding the two front cylinders.
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Old October 8th, 2008, 10:32 PM
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Quote:
Originally Posted by DonWG View Post
300 feet per second flow through the throttle body should be the max rate. If you use that to calculate your TB size, you may find that you need bigger than you think. I went 100mm. One of the main reasons for that decision was the way air enters our manifolds. Too bad we couldn't have the air enter straight down. With the way air enters the plenum I wanted to slow the speed down to control turbulence that may occur feeding the two front cylinders.
Increasing plenum volume helps with this.
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Blue GN: Old combo 559whp/706wtq. New buildup to come with race ported GN 1 heads and intake .
Black GN:Stock 147k shortblock except cam ,KB 70 mm TB and plenum, ported irons 1.77in 1.5ex, RJC head gaskets, ported stock intake, 212-212 comp roller, 1.65 T&D's, RJC powerplate, 1" plenum spacer, 83 lb/hr injectors, double pumper, FAST XFI, G-Body FMIC, welded ported stock manifolds, 3.5 dp, CPT 66BB GTQ, PAC dual nozzle alky injection, Dusty PTC 9.5", 200 4-R by me with billet shafted forward drum, billet input, billet ring gear and planet. 8.5 rear with Auburn, 28 spline Moser axles, and LPW girdle. 10.29@133.46mph .Time with old combo (stock ecm, p-trim turbo, and loose converter) 10.88@126mph. Stage II coming soon .
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Old October 9th, 2008, 04:30 PM
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80mm. Just went over 164.6 MPH last weekend in TSO trim with conservative boost. Wonder when the off the shelf ATR 4 bolts will start holding me back.

3" intercooler piping from the turbo to the TB.
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  #11 (permalink)  
Old October 9th, 2008, 07:46 PM
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Throttlebody Size
70mm, 162.5mph, 26#, pt88, 3" pipes, ATR 4 bolts.
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Old October 9th, 2008, 07:49 PM
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Throttlebody Size
70mm, 162.5mph, 26#, pt88, 3" pipes, ATR 4 bolts.
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Old October 9th, 2008, 09:32 PM
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Originally Posted by strongman View Post
70mm, 162.5mph, 26#, pt88, 3" pipes, ATR 4 bolts.
How many cubes? What is the shift point? Looks like the 70mm isnt much of a problem even with 1100hp
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Blue GN: Old combo 559whp/706wtq. New buildup to come with race ported GN 1 heads and intake .
Black GN:Stock 147k shortblock except cam ,KB 70 mm TB and plenum, ported irons 1.77in 1.5ex, RJC head gaskets, ported stock intake, 212-212 comp roller, 1.65 T&D's, RJC powerplate, 1" plenum spacer, 83 lb/hr injectors, double pumper, FAST XFI, G-Body FMIC, welded ported stock manifolds, 3.5 dp, CPT 66BB GTQ, PAC dual nozzle alky injection, Dusty PTC 9.5", 200 4-R by me with billet shafted forward drum, billet input, billet ring gear and planet. 8.5 rear with Auburn, 28 spline Moser axles, and LPW girdle. 10.29@133.46mph .Time with old combo (stock ecm, p-trim turbo, and loose converter) 10.88@126mph. Stage II coming soon .
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  #14 (permalink)  
Old October 9th, 2008, 09:42 PM
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We have dual 75s on the car we're building.
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Old October 9th, 2008, 10:20 PM
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Quote:
Originally Posted by DonWG View Post
. Too bad we couldn't have the air enter straight down. With the way air enters the plenum I wanted to slow the speed down to control turbulence that may occur feeding the two front cylinders.
Don,Why cant you just make a manifold with an upward facing t-body?
It would require an elbow in the intercooler piping.
I wonder if there are some old open plenum stock style head intakes around that can be modified
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Old October 10th, 2008, 08:26 AM
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Bison asked about cubes and shift points - 274 cubes, 7500 1st, 7800 2nd, Stage II heads, 258-258 cam.
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  #17 (permalink)  
Old October 10th, 2008, 01:48 PM
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Originally Posted by JayC View Post
We have dual 75s on the car we're building.
Are you going to have some type of progessive system for when you break open the throttle? I highly recommend it.
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  #18 (permalink)  
Old October 10th, 2008, 01:52 PM
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If I remember right, I calculated it out once that if the ultimate target is 1250 hp and above, you'd be better off with larger feed piping than 3". Does that mean you couldn't do good with just 3"? Of course not. But, it's hurting you.
Last edited by DonWG : October 10th, 2008 at 01:56 PM.
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Old October 10th, 2008, 01:55 PM
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Quote:
Originally Posted by Otto J View Post
Don,Why cant you just make a manifold with an upward facing t-body?
It would require an elbow in the intercooler piping.
I wonder if there are some old open plenum stock style head intakes around that can be modified
You have the right idea, Otto. I would prefer something more equal length and straight shot down the port than an 'X' manifold.
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