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throttle response - which carb has the best? #1357563
12/23/12 04:02 AM
12/23/12 04:02 AM
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
dangina Offline OP
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dangina  Offline OP
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Lethbridge, AB, Canada
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.
Re: throttle response - which carb has the best? [Re: dangina] #1357564
12/23/12 07:18 AM
12/23/12 07:18 AM
Joined: Sep 2012
Posts: 1,563
Janesville, WI
SpareParts Offline
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SpareParts  Offline
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Janesville, WI
Had a Quick Fuel 850 annular booster double pumper on my 360 once, now on my brother's stout 318. Carb is extremely responsive, previously we had it on a 437" sbc nitrous motor.

Re: throttle response - which carb has the best? [Re: SpareParts] #1357565
12/23/12 09:11 AM
12/23/12 09:11 AM
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Posts: 1,161
Mississippi
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Mr. T Offline
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Mississippi
Between the two you have, I would go with the Holley. I bracked raced for years using a 750 D.P. I finally wore it out. I am currently using a QuickFuel 680 vacuum secondary, and am very well pleased with it on my 360. I would recommend it for your use. The electronic choke would probably come in very handy on those cool Canadian days.

Re: throttle response - which carb has the best? [Re: SpareParts] #1357566
12/23/12 09:52 AM
12/23/12 09:52 AM
Joined: Jan 2003
Posts: 1,022
Andrews,In. U.S.of A.
6
67_Satellite Offline
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Andrews,In. U.S.of A.
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.
Re: throttle response - which carb has the best? [Re: dangina] #1357567
12/23/12 11:01 AM
12/23/12 11:01 AM
Joined: Jan 2003
Posts: 3,575
The Netherlands
BigBlockMopar Offline
master
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The Netherlands
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.

Re: throttle response - which carb has the best? [Re: BigBlockMopar] #1357568
12/23/12 07:50 PM
12/23/12 07:50 PM
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Posts: 43,213
Bend,OR USA
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Cab_Burge Online work
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Bend,OR USA
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


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: throttle response - which carb has the best? [Re: dangina] #1357569
12/23/12 08:32 PM
12/23/12 08:32 PM
Joined: Dec 2003
Posts: 628
Denison,Ia.
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Cuda367 Offline
mopar
Cuda367  Offline
mopar
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Joined: Dec 2003
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Denison,Ia.
I wish I could give you a personnel experience, but I can't. I am very interested in the new Street Demon carb. If it works as it should, I beleive it has all the street demands for a less than 400 inch motor meet in spades. When right the old thermo quad was almost unbeatable, and they took that tech and tried to solve the short comings. I just wish they offered it bigger. At 750 or so it could be unreal as a street strip carb.

Re: throttle response - which carb has the best? [Re: Cab_Burge] #1357570
12/23/12 08:57 PM
12/23/12 08:57 PM
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
dangina Offline OP
pro stock
dangina  Offline OP
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Lethbridge, AB, Canada
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

Re: throttle response - which carb has the best? [Re: dangina] #1357571
12/23/12 09:06 PM
12/23/12 09:06 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
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Romeo MI
Quote:

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




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

Re: throttle response - which carb has the best? [Re: MR_P_BODY] #1357572
12/23/12 09:37 PM
12/23/12 09:37 PM
Joined: Jan 2003
Posts: 6,392
nielsville, minn.
Q
quickd100 Offline
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quickd100  Offline
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nielsville, minn.
My old 750 Carter AFB had explosive throttle response. My 2 850 thermoquads on the tunnelram are just as good if not better.Dave

Re: throttle response - which carb has the best? [Re: quickd100] #1357573
12/23/12 10:00 PM
12/23/12 10:00 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
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Romeo MI
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

Re: throttle response - which carb has the best? [Re: MR_P_BODY] #1357574
12/24/12 12:12 AM
12/24/12 12:12 AM
Joined: May 2003
Posts: 6,563
Downtown Roebuck Ont
Twostick Offline
Still wishing...
Twostick  Offline
Still wishing...

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Posts: 6,563
Downtown Roebuck Ont
If there is any discernible lag in response to pedal input, and your tuner is OK with it, you need a new tuner. Unless of course you have major flaws in your combo that the tuner has pointed out and you haven't addressed ie too much cam and not enough converter or gear.

Kevin

Re: throttle response - which carb has the best? [Re: dangina] #1357575
12/24/12 01:35 AM
12/24/12 01:35 AM
Joined: Feb 2006
Posts: 2,379
MD
Kevins493 Offline
top fuel
Kevins493  Offline
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MD
Quote:

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



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.

Re: throttle response - which carb has the best? [Re: Kevins493] #1357576
12/24/12 08:34 AM
12/24/12 08:34 AM
Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
I Live Here
gregsdart  Offline
I Live Here

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Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
Throttle response on a constant flow FI setup is so great because with no accelerator pumps the idle has to be so rich that alky actually puddles on the intake valves. It doesn't get much better than that. The reason I mention it is a fat idle in a carb will help a bit also. Of course with gas you have a narrower tuning/HP window, so finding the perfect combo of idle/accelerator pump/carb size can be pretty tricky. But I can see why D100s Hemi responds so well. Two small venturis to maintain decent AFR as it transitions from off idle to full jet flow to secondary opening. Not to mention his tuning skills.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: throttle response - which carb has the best? [Re: Mr. T] #1357577
12/24/12 09:40 AM
12/24/12 09:40 AM
Joined: Nov 2008
Posts: 1,491
Lethbridge, AB, Canada
dangina Offline OP
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dangina  Offline OP
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Lethbridge, AB, Canada
thanks for the great info guys! Maybe I should just stop playing around with rebuilds and start off new...I read that the smaller ones will get you better response but sacrifices hp, but I've also read the 383's respond better with bigger carbs when you swap out the cams and intake. Its an 71 rr air grabber car I don't know if that helps i the decision making...

Quote:

Between the two you have, I would go with the Holley. I bracked raced for years using a 750 D.P. I finally wore it out. I am currently using a QuickFuel 680 vacuum secondary, and am very well pleased with it on my 360. I would recommend it for your use. The electronic choke would probably come in very handy on those cool Canadian days.




I thought about getting a carb with an electric choke for our cooler springs/falls. I never have owned one and was curious how do they work? Do you just have it on a switch and turn it off when your car is warmed up?

Re: throttle response - which carb has the best? [Re: dangina] #1357578
12/24/12 10:49 AM
12/24/12 10:49 AM
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Posts: 3,695
nc
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emarine01 Offline
master
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nc
Annular boosters w/any double pump

Re: throttle response - which carb has the best? [Re: emarine01] #1357579
12/24/12 11:00 AM
12/24/12 11:00 AM
Joined: Apr 2004
Posts: 324
Northport, al.
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tvt59 Offline
enthusiast
tvt59  Offline
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Northport, al.
On my bracket cars I always used 1 to 1 linkage on them. After sorting them out They revved like a fuel injected car. They worked good on the street also. Just could not get any fuel mileage with them.

Re: throttle response - which carb has the best? [Re: tvt59] #1357580
12/24/12 12:39 PM
12/24/12 12:39 PM
Joined: Dec 2004
Posts: 10,555
Rittman Ohio
fourgearsavoy Offline
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Rittman Ohio
Some good features on this carb and it might be big enough for your application
http://www.demoncarbs.com/1900.asp

Gus

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64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
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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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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)
Re: throttle response - which carb has the best? [Re: dangina] #1357582
12/24/12 02:45 PM
12/24/12 02:45 PM
Joined: Mar 2008
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Ontario, Canada
Dodgem Offline
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Dodgem  Offline
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Ontario, Canada
383 4 speed hands down the 750 DP and it will be great on the 451 stroker too!!!!




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