throttle response - which carb has the best?
#1357563
12/23/12 04:02 AM
12/23/12 04:02 AM
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Joined: Nov 2008
Posts: 1,491 Lethbridge, AB, Canada
dangina
OP
pro stock
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OP
pro stock
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
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I've used the old carters on previous mopars, and quite frankly I never liked the lack or response or that 1-2 sec delay when you put down the gas. i have a edlebrock 600 cfm kicking around on an engine and i also have a holley 750 cfm double pumper, both needing a rebuild - i haven't tried out either one yet so I can't comment on performance, so I thought what is the best out there? I love the instant throttle response of fuel injected cars so i would like to get the best I can. Is it worth rebuilding the edlebrock or the holley or should I just end up selling them and getting something better. It will be going on my 383 4 speed, 3:55 gears, relativly stock build other than cam, intake and headers.
heres the catch, In about a year I'll be doing a 451 stroker, So I probably will have to upgrade anyways for the build probably an 850. I just wanna hear some opinions on your experiences with carbs...
sorry I should mention the car is a pro-touring car that is daily drivin during the spring & summer, while getting in some autox and road race when possible...
Last edited by dangina; 12/23/12 04:13 AM.
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Re: throttle response - which carb has the best?
[Re: SpareParts]
#1357566
12/23/12 09:52 AM
12/23/12 09:52 AM
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Joined: Jan 2003
Posts: 1,022 Andrews,In. U.S.of A.
67_Satellite
super stock
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super stock
Joined: Jan 2003
Posts: 1,022
Andrews,In. U.S.of A.
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Part of the reason such a large-for-c.i. carburetor,like that 850 on a 318, has such good throttle response is that it will allow much more air into the engine for a given pedal movement. If you press the pedal "X" amount with a small throttle blade, then try it again,the same amount with a much larger throttle blade,the larger throttle blade will drop the manifold vacuum further. Less vacuum = more cylinder pressure = more throttle response. How far the cable mounting point is from the centerline of the throttle shaft will also affect the amount of opening for a given pedal movement.
Last edited by 67_Satellite; 12/23/12 09:59 AM.
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Re: throttle response - which carb has the best?
[Re: dangina]
#1357567
12/23/12 11:01 AM
12/23/12 11:01 AM
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Joined: Jan 2003
Posts: 3,575 The Netherlands
BigBlockMopar
master
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master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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Quote:
I've used the old carters on previous mopars, and quite frankly I never liked the lack or response or that 1-2 sec delay when you put down the gas.
1-2 seconds? Sounds more like the operator needs a tune-up first. ![](/ubbthreads/images/graemlins/wave.gif)
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Re: throttle response - which carb has the best?
[Re: Cab_Burge]
#1357570
12/23/12 08:57 PM
12/23/12 08:57 PM
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Joined: Nov 2008
Posts: 1,491 Lethbridge, AB, Canada
dangina
OP
pro stock
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OP
pro stock
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
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Quote:
Quote:
Quote:
I've used the old carters on previous mopars, and quite frankly I never liked the lack or response or that 1-2 sec delay when you put down the gas.
1-2 seconds? Sounds more like the operator needs a tune-up first.
The accelerator pump adjustment arm and squirter size should be check now
the operator does need a tune up first! The carter and thermoquads i use to have weren't bad carb's - They weren't that responsive off the line - I'd even take it to a tuner and I'd still get a delay of 1/2 second or so when you stop on the gas before the engine kicked in. Although I do admit the old motors were pretty close to stock, I'm looking at a better response time, as instant as possible. I'm still going to take it to a tuner when the engine is in
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Re: throttle response - which carb has the best?
[Re: dangina]
#1357571
12/23/12 09:06 PM
12/23/12 09:06 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
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I've used the old carters on previous mopars, and quite frankly I never liked the lack or response or that 1-2 sec delay when you put down the gas.
1-2 seconds? Sounds more like the operator needs a tune-up first.
The accelerator pump adjustment arm and squirter size should be check now
the operator does need a tune up first! The carter and thermoquads i use to have weren't bad carb's - They weren't that responsive off the line - I'd even take it to a tuner and I'd still get a delay of 1/2 second or so when you stop on the gas before the engine kicked in. Although I do admit the old motors were pretty close to stock, I'm looking at a better response time, as instant as possible. I'm still going to take it to a tuner when the engine is in
The smaller the carb is, the more responsive it will be but it also hurts HP so you have to come up with a balance... with a 1050 on my 405ci I dont have a problem because I dont foot brake.. so I am up in the revs soon enough using the trans brake... I have a 850 Holley on my 416 street car and it reacts quickly ![](/ubbthreads/images/graemlins/wave.gif)
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Re: throttle response - which carb has the best?
[Re: quickd100]
#1357573
12/23/12 10:00 PM
12/23/12 10:00 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
My old 750 Carter AFB had explosive throttle response. My 2 850 thermoquads on the tunnelram are just as good if not better.Dave
And if you put 2 2bbls on that tunnel ram it would be MUCH faster responding... its just a matter of how much air you move through the venturi per RPM ![](/ubbthreads/images/graemlins/wave.gif)
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Re: throttle response - which carb has the best?
[Re: dangina]
#1357575
12/24/12 01:35 AM
12/24/12 01:35 AM
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Joined: Feb 2006
Posts: 2,379 MD
Kevins493
top fuel
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top fuel
Joined: Feb 2006
Posts: 2,379
MD
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Quote:
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I've used the old carters on previous mopars, and quite frankly I never liked the lack or response or that 1-2 sec delay when you put down the gas.
1-2 seconds? Sounds more like the operator needs a tune-up first.
The accelerator pump adjustment arm and squirter size should be check now
the operator does need a tune up first! The carter and thermoquads i use to have weren't bad carb's - They weren't that responsive off the line - I'd even take it to a tuner and I'd still get a delay of 1/2 second or so when you stop on the gas before the engine kicked in. Although I do admit the old motors were pretty close to stock, I'm looking at a better response time, as instant as possible. I'm still going to take it to a tuner when the engine is in
If they're set up right they work just fine. Been 1.34 60' with 2 eddy 750 performer (AFB style) carbs. Car will 60' as good or better than most dominator/backhalf/4 link type cars that run the same et.
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Re: throttle response - which carb has the best?
[Re: dangina]
#1357581
12/24/12 02:36 PM
12/24/12 02:36 PM
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Joined: Aug 2003
Posts: 43,355 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,355
Bend,OR USA
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My 383 dart has a Holley 1850 that I added a electric choke on it, I hooked the positive feed wire to the ignition circuit that feeds the coil resitor ![](/ubbthreads/images/graemlins/thumbs.gif) that way it is on as soon as I start the car, it work great after I got it adjusted properly ![](/ubbthreads/images/graemlins/thumbs.gif) As far as your hesitation your experiencing, all cars should have no discernable hesitation in nuetral or in gear ![](/ubbthreads/images/graemlins/1343795-scratchchin.gif) If you do there is a problem, not neccessarily you ![](/ubbthreads/images/graemlins/tsk.gif) But the carbs. do ![](/ubbthreads/images/graemlins/Twocents.gif) All things mechanical can go bad and be faulty, but they can be fixed also ![](/ubbthreads/images/graemlins/thumbs.gif) I've seen carbs. act up with old gas in them, some wouldn't even start without priming them with fresh gas or starting fluids ![](/ubbthreads/images/graemlins/shruggy.gif)
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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