Re: AVS vs TQ on max flow
[Re: cudaman1969]
#3090474
10/30/22 01:41 PM
10/30/22 01:41 PM
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Out of the State of Confusion
blue_stocker
pro stock
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Out of the State of Confusion
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I think that's pretty much individual choice as I've seen a lot of LA enigned stock eliminator cars utilizing both...go figure?! The TQ will flow more air but performance-wise, I think it depends on the combination and tuning. Just my .02$
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Re: AVS vs TQ on max flow
[Re: cudaman1969]
#3090488
10/30/22 02:49 PM
10/30/22 02:49 PM
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Joined: Jan 2003
Posts: 1,755
Windsor, ON, Canada
Diplomat360
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I would have to agree with blue_stocker, and besides, you have at least three kinds of TQs:
1) small primary - 1-3/8"
2) large primary - 1-1/2"
3) race carb - 1-1/2" where the 4846 was 850 cfm's while the 4847 was the 1,000 cfm carb
Beyond the pure sizing of it comes the actual tune!
I've been itching to toss the CS-4846SA I have here on my small block, it'll replace the 9800 series I've got right now...won't happen until the spring though.
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Re: AVS vs TQ on max flow
[Re: blue_stocker]
#3090491
10/30/22 03:10 PM
10/30/22 03:10 PM
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fredericksburg,va
cudaman1969
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I think that's pretty much individual choice as I've seen a lot of LA enigned stock eliminator cars utilizing both...go figure?! The TQ will flow more air but performance-wise, I think it depends on the combination and tuning. Just my .02$ The AVS allows my car to be 150 pounds lighter over the TQ. 340 with the AVS is NHRA rated at 299 hp The TQ is 314, same internals. Its what rpm does the AVS stop flowing is what I’m asking. Only one TQ can be used, one with small primaries. Same for AVS Have to hurry up and get my flowbench built.
Last edited by cudaman1969; 10/30/22 03:11 PM.
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Re: AVS vs TQ on max flow
[Re: Cab_Burge]
#3090515
10/30/22 04:55 PM
10/30/22 04:55 PM
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fredericksburg,va
cudaman1969
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Do you want the car to go as fast as it can? If so go with the bigger CFM Thermoquad. If you want to run class at NHRA races and you can't outrun the 1971 340 cars run the AVS and hope you're as fast as any other car in the same class. If you're not get to work now so you can outrun them heads up    I would run the same class, same index, but at 150 pounds LESS than the TQ. Only difference is carb. How much is 150 pounds worth (index 11.85)? Same car, different grill, same 340 engine.
Last edited by cudaman1969; 10/30/22 04:58 PM.
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Re: AVS vs TQ on max flow
[Re: cudaman1969]
#3090520
10/30/22 05:14 PM
10/30/22 05:14 PM
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New York
polyspheric
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New York
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The TQ manifold is much better than the AVS: bigger plenum
Boffin Emeritus
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Re: AVS vs TQ on max flow
[Re: FurryStump]
#3090540
10/30/22 07:21 PM
10/30/22 07:21 PM
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fredericksburg,va
cudaman1969
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and the turn is at the plenum, unlike the 340 intake that has a distinct runner the goes left and right. I’ll have to look both over real good, TQ intake is still untouched but the AVS intake has hidden internal mods.
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Re: AVS vs TQ on max flow
[Re: cudaman1969]
#3090581
10/30/22 11:52 PM
10/30/22 11:52 PM
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Joined: Aug 2003
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Bend,OR USA
Cab_Burge
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You would be wise to check with your local division tech guy about what they currently rate the 1971 340 motors in the A bodies compared to what they rate the 1970 340 with the AVS in NHRA stock, same deal on the 1972 and 1973 340 thermoquad motors  I use to race in NHRA stock, a good friend of mine set E/SA record in his 1971 340 Demon at 10.89 that stood for two years before NHRA put it back to a minimum  NHRA can be very political, all the Chevy racers in his class griped and cried and file protest on him until NHRA refactor his combination up to 305 HP  He built a new car, 1970 Challenger T/A clone and set the record in it also, they ended up refactoring that combination to 315 HP in the T/A Challengers, the 340 6 pack AAR didn't get hit at all  He finally quit NHRA racing and got into Jeeps and off roading 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: AVS vs TQ on max flow
[Re: Cab_Burge]
#3090586
10/31/22 01:02 AM
10/31/22 01:02 AM
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TN
1DGEMAN
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[quote=Cab_Burge]You would be wise to check with your local division tech guy about what they currently rate the 1971 340 motors in the A bodies compared to what they rate the 1970 340 with the AVS in NHRA stock, same deal on the 1972 and 1973 340 thermoquad motors I use to race in NHRA stock, a good friend of mine set E/SA record in his 1971 340 Demon at 10.89 that stood for two years before NHRA put it back to a minimum NHRA can be very political, all the Chevy racers in his class griped and cried and file protest on him until NHRA refactor his combination up to 305 HP He built a new car, 1970 Challenger T/A clone and set the record in it also, they ended up refactoring that combination to 315 HP in the T/A Challengers, the 340 6 pack AAR didn't get hit at all He finally quit NHRA racing and got into Jeeps and off roading [/knuote The Demon was my old car. First Stick 340 to hold record in the 11"s Gene bought it from Xavier Conklin many years later. he and Etter were in a race to the 10"s Gene won. The Ta Challenger was super quick. I saw it go 10.40's. It was legal in the day but would not pass tech now. It was factored to 320 hp after a really quick run at Pomona. The original question was is the Tquad worth the HP factor. Chuck Beach could build you really quick AVS. Jerry Bennet runs really quick with an AVS in his Duster. I still feel the Tquad is a better combo especially if you can get your hands on a 4972 or 4973. If you run an Ebody then the best Combo is 340 six pack. rated 304 with aluminum heads with both stick and auto or the stick combo rated 308 with iron heads.
Real Men shift for themselves
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Re: AVS vs TQ on max flow
[Re: cudaman1969]
#3090621
10/31/22 08:57 AM
10/31/22 08:57 AM
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MI, usa
dvw
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Do you want the car to go as fast as it can? If so go with the bigger CFM Thermoquad. If you want to run class at NHRA races and you can't outrun the 1971 340 cars run the AVS and hope you're as fast as any other car in the same class. If you're not get to work now so you can outrun them heads up I would run the same class, same index, but at 150 pounds LESS than the TQ. Only difference is carb. How much is 150 pounds worth (index 11.85)? Same car, different grill, same 340 engine. At 150lbs it would have to be be WAY better. 150lbs is pretty close to .15 in ET Doug
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Re: AVS vs TQ on max flow
[Re: 1DGEMAN]
#3090643
10/31/22 10:32 AM
10/31/22 10:32 AM
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fredericksburg,va
cudaman1969
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[quote=Cab_Burge]You would be wise to check with your local division tech guy about what they currently rate the 1971 340 motors in the A bodies compared to what they rate the 1970 340 with the AVS in NHRA stock, same deal on the 1972 and 1973 340 thermoquad motors I use to race in NHRA stock, a good friend of mine set E/SA record in his 1971 340 Demon at 10.89 that stood for two years before NHRA put it back to a minimum NHRA can be very political, all the Chevy racers in his class griped and cried and file protest on him until NHRA refactor his combination up to 305 HP He built a new car, 1970 Challenger T/A clone and set the record in it also, they ended up refactoring that combination to 315 HP in the T/A Challengers, the 340 6 pack AAR didn't get hit at all He finally quit NHRA racing and got into Jeeps and off roading [/knuote The Demon was my old car. First Stick 340 to hold record in the 11"s Gene bought it from Xavier Conklin many years later. he and Etter were in a race to the 10"s Gene won. The Ta Challenger was super quick. I saw it go 10.40's. It was legal in the day but would not pass tech now. It was factored to 320 hp after a really quick run at Pomona. The original question was is the Tquad worth the HP factor. Chuck Beach could build you really quick AVS. Jerry Bennet runs really quick with an AVS in his Duster. I still feel the Tquad is a better combo especially if you can get your hands on a 4972 or 4973. If you run an Ebody then the best Combo is 340 six pack. rated 304 with aluminum heads with both stick and auto or the stick combo rated 308 with iron heads. I’ll answer both, I just looked at the NHRA stock classification guide on Classracer to get those numbers for the current year. I did pickup the 4972 carb. I looked at both intakes side by side visually look real close (TQ intake is open under the carb more but runners look equal) Butterfly are of the TQ is 5.6 the AVS is 4.9 squad inches total of the four blades, that’s considerable. Once I get it together (hopefully this spring) I’ll test each. The numbers I got for ‘car’ weight without me in it are as follows. AVS D/S 2930 total 3011 E/S 3080 3160 F/S 3230 3310 TQ D/S 3073 3153 E/S 3230 3310 F/S 3387 3387 143-150-157 pounds respectively in this light of a car could be substantial imo
Last edited by cudaman1969; 10/31/22 10:46 AM.
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Re: AVS vs TQ on max flow
[Re: moparx]
#3090742
10/31/22 02:54 PM
10/31/22 02:54 PM
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fredericksburg,va
cudaman1969
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are you going to use the same intake to test both carbs ? if so, what kind of adapter are you using [on whatever intake was to be used with whatever carb] ? or are you going to switch intakes to match the carb being tested at the time ?  Switch both, can’t run it that way, intake has to match carb or disqualified
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Re: AVS vs TQ on max flow
[Re: dvw]
#3090753
10/31/22 03:19 PM
10/31/22 03:19 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
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Do you want the car to go as fast as it can? If so go with the bigger CFM Thermoquad. If you want to run class at NHRA races and you can't outrun the 1971 340 cars run the AVS and hope you're as fast as any other car in the same class. If you're not get to work now so you can outrun them heads up I would run the same class, same index, but at 150 pounds LESS than the TQ. Only difference is carb. How much is 150 pounds worth (index 11.85)? Same car, different grill, same 340 engine. At 150lbs it would have to be be WAY better. 150lbs is pretty close to .15 in ET Doug My thought also. I don't see the TQ making enough more power to overcome 150 lbs.
CHIP
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'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: AVS vs TQ on max flow
[Re: an8sec70cuda]
#3090775
10/31/22 04:44 PM
10/31/22 04:44 PM
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Joined: Jan 2004
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fredericksburg,va
cudaman1969
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Do you want the car to go as fast as it can? If so go with the bigger CFM Thermoquad. If you want to run class at NHRA races and you can't outrun the 1971 340 cars run the AVS and hope you're as fast as any other car in the same class. If you're not get to work now so you can outrun them heads up I would run the same class, same index, but at 150 pounds LESS than the TQ. Only difference is carb. How much is 150 pounds worth (index 11.85)? Same car, different grill, same 340 engine. At 150lbs it would have to be be WAY better. 150lbs is pretty close to .15 in ET Doug My thought also. I don't see the TQ making enough more power to overcome 150 lbs. My thoughts too, someone must have hit the AHFS number and got 30 pounds or hp increase.
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