Re: Vote for the Carb(s) I test on the Dyno!
[Re: davenc]
#2389058
10/17/17 11:41 PM
10/17/17 11:41 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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TEST THEM ALL, LET DYNO SORT THEM OUT
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Vote for the Carb(s) I test on the Dyno!
[Re: BradH]
#2389125
10/18/17 02:23 AM
10/18/17 02:23 AM
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Joined: Dec 2014
Posts: 304 Florida
Mark Whitener
enthusiast
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enthusiast
Joined: Dec 2014
Posts: 304
Florida
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#5, 6B will be nearly identical but 5 gets the nod. Scrap the 1.60 you got from Andy for the test. And the Race Q1000 down leg should be a 1.500 venturi, that might be an interesting test against the 1.59 annular.
Mark Whitener [url=www.racingfuelsystems.com[/url]
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Re: Vote for the Carb(s) I test on the Dyno!
[Re: AndyF]
#2389289
10/18/17 01:12 PM
10/18/17 01:12 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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6a was dialed in pretty good when I ran it. AFR was in the low 13's, made 650 hp on my 470 back before the intake was ported, BSFC was 0.400, Correction Factor was 1.02 so pretty good air. Dyno shop is close to sea level.
My dyno sheets show that we had 88 and 99 jets in it for those pulls. That was the Mark W tune. Worked great from 3500 to 7000 rpm. If you're testing near sea level then I'd use the original Mark W. tune and let it rip. Makes sense that as MOST dyno's do from 3500-7500 and up it may have been ok but trust me, it killed my oil n plugs below that and could NOT even do a burnout. I'm not bagging on anyone or pointing fingers but on the steet where it matters most, it was a pig and I know it was loaned out as well so who knows there. IIRC, it had .080-.090 but not 100% and not near my book..............I see zero reasons to EVER run a 4150 on any motor making good power and have proved it many times even on small-blocks that have picked up a several mph and .010's so me, I'd ditch/sell em all and put a real carb on that puppy........... And .088-.099 jets........that's insane and even 1250's rarely run that size which should tell ya something...........
Last edited by Thumperdart; 10/18/17 01:22 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Vote for the Carb(s) I test on the Dyno!
[Re: Mark Whitener]
#2389333
10/18/17 03:10 PM
10/18/17 03:10 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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#5, 6B will be nearly identical but 5 gets the nod. Scrap the 1.60 you got from Andy for the test. I had been thinking along the same carbs to test (the QFT 1.52 downleg & the QFT 1.59 annular) along w/ the baseline BG. The Holley 1.60 annular conversion is sitting on a stand ready to bolt on (except I did notice the linkage is binding for some reason). No reason not to at least throw it on to see how it does... time permitting. And the Race Q1000 down leg should be a 1.500 venturi, that might be an interesting test against the 1.59 annular. That's what I expected, too (i.e., 1.50" venturi). However, I measured mine after you installed the BLP boosters and found it measured 1.52", and later on found a QFT spec sheet that listed the RQ-1000 as 1.52", also. It makes sense, considering their venturi increases from "950" to "1000" is .07", and from "1000" to "1050" is another .07".
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Re: Vote for the Carb(s) I test on the Dyno!
[Re: sixpackgut]
#2389337
10/18/17 03:11 PM
10/18/17 03:11 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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TEST THEM ALL, LET DYNO SORT THEM OUT This is the carburetor equivalent of "Kill 'em all. Let God sort 'em out.", right?
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Re: Vote for the Carb(s) I test on the Dyno!
[Re: davenc]
#2389339
10/18/17 03:13 PM
10/18/17 03:13 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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What criteria are you planning to use to evaluate the carbs? Peak numbers, area under the curve, something else?? The evaluation won't be strictly on peak HP & torque #s, but also the fuel curve, amount of air being used, differences in where a particular carb might show better than another, etc. I've seen where two carbs that made virtually the same power on the dyno still ran .2 & 2 MPH differently on the car. Whatever looks like the most worth testing based on the dyno results will still get flogged on the car to prove it.
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Re: Vote for the Carb(s) I test on the Dyno!
[Re: BradH]
#2389354
10/18/17 03:32 PM
10/18/17 03:32 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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TEST THEM ALL, LET DYNO SORT THEM OUT This is the carburetor equivalent of "Kill 'em all. Let God sort 'em out.", right? Yes
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Vote for the Carb(s) I test on the Dyno!
[Re: AndyF]
#2389477
10/18/17 08:07 PM
10/18/17 08:07 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Any chance you have more carbs than you need Brad? Why the He11 would you think that??? Oh wait, before you answer that would you like to buy a carb Brad? I don't think I need my QF-1050-AN anymore now that I switched to EFI so I'll make you a good deal on it....... That reminds me... can you provide me w/ your QFT RQ-1050-AN tune so I can duplicate it w/ all the parts I have sitting around to build one myself?
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Re: Vote for the Carb(s) I test on the Dyno!
[Re: BradH]
#2389623
10/19/17 12:05 AM
10/19/17 12:05 AM
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Joined: May 2005
Posts: 598 NC, USA
davenc
mopar
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mopar
Joined: May 2005
Posts: 598
NC, USA
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I've seen where two carbs that made virtually the same power on the dyno still ran .2 & 2 MPH differently on the car. Whatever looks like the most worth testing based on the dyno results will still get flogged on the car to prove it.
And that is what I was wondering. If the criteria isn't clear going into your test, you may pick the wrong carbs to test. To me, it would seem that the best criteria would be area under the curve, in the RPM range encountered during the run; the right carb for a narrow range is likely different than for a wider range. Not knowing any of those details, my vote would be for 1, 4, and 6B.
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Re: Vote for the Carb(s) I test on the Dyno!
[Re: davenc]
#2389718
10/19/17 08:53 AM
10/19/17 08:53 AM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
OP
Taking time off to work on my car
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OP
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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I've seen where two carbs that made virtually the same power on the dyno still ran .2 & 2 MPH differently on the car. Whatever looks like the most worth testing based on the dyno results will still get flogged on the car to prove it.
And that is what I was wondering. If the criteria isn't clear going into your test, you may pick the wrong carbs to test. To me, it would seem that the best criteria would be area under the curve, in the RPM range encountered during the run; the right carb for a narrow range is likely different than for a wider range. Not knowing any of those details, my vote would be for 1, 4, and 6B. The on-track differences like I pointed out were due to shift recovery (how quickly the carb adjusts to change in RPM & load) characteristics, which a basic engine dyno doesn't take into account.
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