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Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#1
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Throttle body size recommendation
I'm building an engine for a customer and the boost arena is something new for me. I'm looking for some recommendations on throttle body size for this combination.
The engine will be a 525" aluminum block, 4.5" stroke, KRE High Port 380 CFM heads, hydraulic roller 255/265 duration, Northwind intake with fuel injection rails added by Wilson manifolds, gooseneck forward to throttle body, 9.25 compression, dual TorqueStorm procharger belt system with two intercoolers This is a street / show car 79' Trans Am, 6L80E transmission, 3:73 gear 9" rear. I have had recommendations from 90 - 105 MM on the throttle body and I simply don't know. Any thoughts are appreciated
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#2
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#3
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Hey John, since it's a street car probably see 7000 max. Regarding boost, probably on the 12 lbs range
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#4
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I'd say it would need around 1900/2000 cfm throttle body. (more for racing, but 'street' use probably good enough)
My 'Toilet Bowl' is 4" diameter (around 101mm I think) which supposedly flows 1500 cfm. You would probably need the 105mm at least? Probably good for street type use. But I'd try for a little bigger? Found this on sizes on Killer Ron's website: Quote:
Link to the 'Terminator' style throttle body of Flying Toilet: Terminator May give some ideas on the size.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates Last edited by johnta1; 11-21-2022 at 04:07 PM. |
#5
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105 mm is a very common size for the Accufab and Holley throttle bodies (single blade).
The LS Intakes in this intake system can mount a 105 mm Throttle Body as designed right from Holley for LS Chevy engines, see photo. I personally would not use anything smaller than the 105mm TB. So you have a choice on either a 4 BBL 105 MM TB flow or a single 105 mm TB flow set-up. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#6
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We run a 105mm on our 461 cu.in. twin turbo car. seems to like it.
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
#7
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105 or bigger
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My Half AN Injun..... |
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