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#1
03-02-2020, 11:08 PM
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Carburetor for slalom/time attack racing?
So I took my 81 T/A out racing yesterday to do time attack (slalom racing) through a cone obstacle course with high speed and very sharp/hard corners. My Holley 770 Street Avenger, which works well for straight acceleration driving and normal driving certainly struggled yesterday. With that said, would I be better off going with a Holley 500 or 650 2bbl carb for such adventures?
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 Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#2
03-03-2020, 07:21 AM
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You would be far better off with a Q-jet and it's one centralized fuel bowl and its plastic sloush cover.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
03-03-2020, 08:50 AM
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Installing floats with a wedge on each side will help. Quick Fuel pn16-55 or something like that. The floats will help with the right and left turns.
Quick Fuel 59-10 vent baffles will help with hard braking and acceleration. Mechanical secondary carbs usually work better for that style of racing. If you have a vacuum operated secondary carb a lighter spring will should help. Last edited by PAUL K; 03-03-2020 at 08:58 AM. |
| The Following User Says Thank You to PAUL K For This Useful Post: | ||
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#4
03-03-2020, 10:40 AM
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Quote:
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Carburetor building & modification services Servicing the Pontiac community over 20 years |
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#5
03-03-2020, 11:01 AM
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Thank you Gentlemen,
I was also thinking and perhaps overthinking but would a Holley 6425 650 2bbl carb be a good/better choice or perhaps a off-road carb like a Holley 770 Truck Avenger?
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Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#6
03-03-2020, 01:39 PM
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I would keep it simple and try a Holley 650 4777.
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 466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
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#7
03-03-2020, 02:15 PM
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That is what I autocrossed with on the 383 SBC 4 speed in the Camaro before the IA project with it.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#8
03-04-2020, 01:31 AM
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Give me the full specs on your current setup if you don't mind.
I have successfully built, tuned and campaigned carbs from Holley, Braswell and Bolaws in situations with over 3 sustained lateral G's and changes in direction of over 6. It can be done with what you have ��
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Working on going faster (and now staying dry at the same time !!) |
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#9
03-14-2020, 09:40 PM
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Quote:
 Thank you for asking, I just finished rebuilding my Holley 770 Ultra Street Avenger carb and while at it, I installed trapezoid road race floats, spring loaded (off road) needle and seats as well as the off road vent tube. While waiting for those parts to come from Allstate Carburetor, I went ahead and dropped the tank and flushed it (cleaner than expected) and replaced the pick-up/sending unit. At them moment I have a 625 Street Demon carb on it but I will be taking the 770 with me tomorrow as well to see how it does. I think the 625 is going to be a little small but I had a pair of them for 2x4 on the 78 T/A before I went to nitrous for the Street Outlaws heads up series here. If neither of these work, I'll order more parts and rebuild the 4777 650 DP I have.
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Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#10
03-14-2020, 10:21 PM
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I have a nice Holley Hemi carb with Lemans bowls that would work great for you!Tom
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#11
03-14-2020, 10:38 PM
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Quote:
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Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#12
03-17-2020, 07:26 PM
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No worries, can you provide me with an email address, I can then send some info. Cheers
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Working on going faster (and now staying dry at the same time !!) |
| The Following User Says Thank You to 455-4+1 For This Useful Post: | ||
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#13
03-17-2020, 08:23 PM
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Quote:
__________________
Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
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#14
03-23-2020, 12:06 AM
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Reply sent, our country has now been placed at 100% lock down, oy essential /emergency services may work, everyone else is on home lock down and all domestic travel suspended....
I may have a bit of time on my hands in the next 4 weeks min lock down period
__________________
Working on going faster (and now staying dry at the same time !!) |
| The Following User Says Thank You to 455-4+1 For This Useful Post: | ||
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#15
04-09-2020, 02:27 PM
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use a Holley sniper efi -- prob solved
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