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: 1,025 Andrews,In. U.S.of A.
67_Satellite
super stock
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super stock
Joined: Jan 2003
Posts: 1,025
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.
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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
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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
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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:
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: 43,727 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,727
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 that way it is on as soon as I start the car, it work great after I got it adjusted properly As far as your hesitation your experiencing, all cars should have no discernable hesitation in nuetral or in gear If you do there is a problem, not neccessarily you But the carbs. do All things mechanical can go bad and be faulty, but they can be fixed also 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
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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