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Holley calibration information needed
#1579892
02/16/14 07:36 PM
02/16/14 07:36 PM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
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Went to the track the 1st time with my my Pro Systems 750 Holley. Currently its running a 50cc front shooter and 30cc rear shooter - both new diaphrams. The car hooked fine..but my 60ft was still about 1/10th under where I think it should be...(Best was 1.84) It feels "soggy" at launch..and there was no difference between a launch at 800rpm and at 2500  So here's my questions - What is the recommended set up for dual pump shooters? - should they be the same size..or should the primary be smaller than the sec? What effect does it have swapping the small one and the big one from primary side to secondary side? Can I run a 30cc diaphragm on a 50cc cam? What effect would this have? Please bear with me - I'm not seeking "tuning" advice for this motor - its not far off being jetted correctly....but I don't understand how the twin pump shooter configuration is supposed to be set up..... 
67 RO23 clone with 6.1 SRT Hemi and dual quads. Soon to have Drag Pak induction and Throttle body.
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Re: Holley calibration information needed
[Re: Moparmal]
#1579894
02/16/14 10:46 PM
02/16/14 10:46 PM
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Joined: Aug 2003
Posts: 43,163
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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I never been a fan of the 50 CC pumps on any Holley carb., no matter what size  I have changed the rear 50 CC pump to a 30 CC pump and ended up with better 60 ft times on a bracket 440 motor with a Holley 800 D.P. carb.  I did the same thing on a SS style Hemi motor with a stock crossram that had dual 750 D.P. carbs with 50 CC pumps on the rear, we changed them to 30 CC pumps(you have to change the pump arm also ) and put in 31 squirters to get the best 60 ft. times that day at that track  I would adjust the accelerator pump arms like Holley says to and go from there You can slow the 60 ft. times down with to much accerator pump shot is what I'm trying to say 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Holley calibration information needed
[Re: Moparmal]
#1579897
02/16/14 11:47 PM
02/16/14 11:47 PM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
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OP
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
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What you guys are suggesting makes sense compared to what Im feeling thru the seat of the pants.. Seems like Ive gone from not having enough pump shot with the Eddie Thunder to having too much. Ill change the front shooter to 30cc and see if it improves at the track Thx for your help 
67 RO23 clone with 6.1 SRT Hemi and dual quads. Soon to have Drag Pak induction and Throttle body.
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Re: Holley calibration information needed
[Re: Moparmal]
#1579904
02/18/14 01:27 AM
02/18/14 01:27 AM
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Joined: Aug 2003
Posts: 43,163
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Quote:
So changing squirter size is not the same as changing the diaghram?
So which should I change...the 50cc diaphram and cam......or the shooter?
When you change the squirters you end up changing how long the fuel squirts through them, not how much by volume, just the time it squirts out If you enlarge the squiter isze it will stop squirting sooner than when it has smaller squirters in it. If you want to reduce the volume used per stroke on the accelerator pump circuit change from the larger pump,50 CC, to the smaller 30 CC pump Holley, for what ever reasons, uses ten stroke on each pump to distingish(SP?) the differences between the 30 CC and the 50 cc pumps, it is not pumping 30 CC or 50 CC per pump shot
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Holley calibration information needed
[Re: Cab_Burge]
#1579905
02/18/14 07:21 AM
02/18/14 07:21 AM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
OP
master
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OP
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
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Cheers Cab This thing has 40th front and rear squirters...which is probably a little large for my purposes? My main question is that b4 I change anything...would I have more luck with the 50cc pump on the primaries or secondaries? Or do I just swap them over and suck it and see?  
67 RO23 clone with 6.1 SRT Hemi and dual quads. Soon to have Drag Pak induction and Throttle body.
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Re: Holley calibration information needed
[Re: Moparmal]
#1579906
02/18/14 11:23 AM
02/18/14 11:23 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Cheers Cab
This thing has 40th front and rear squirters...which is probably a little large for my purposes?
My main question is that b4 I change anything...would I have more luck with the 50cc pump on the primaries or secondaries?
Or do I just swap them over and suck it and see?
wow 40 seems like too much unless you have a 500 inch motor. If you are running the 5.7 in your sig I'd try 31's and go up from there.
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Re: Holley calibration information needed
[Re: Moparmal]
#1579907
02/18/14 01:35 PM
02/18/14 01:35 PM
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Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Larger than needed jets can also bring the 60 foot numbers down!. and with big cams like my timing all in by 1200?
Last edited by Dodgem; 02/18/14 01:36 PM.
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Re: Holley calibration information needed
[Re: Moparmal]
#1579911
02/18/14 08:24 PM
02/18/14 08:24 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:
Cheers Cab
This thing has 40th front and rear squirters...which is probably a little large for my purposes?
My main question is that b4 I change anything...would I have more luck with the 50cc pump on the primaries or secondaries?
Or do I just swap them over and suck it and see?
The largest squirters I have ever used was a 36 and
that was too much... I have a 850 with dual 50cc
pumps on it.. the pumps just have the volume.. the
squirters tell it how much to shoot but with 50cc
it will go much longer if needed
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Re: Holley calibration information needed
[Re: MR_P_BODY]
#1579914
02/22/14 01:27 AM
02/22/14 01:27 AM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
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OP
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
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U were spot on Mr P!! UPDATE - Swapped the 50cc pump to the secondaries and the 30cc to the primaries - Improved 2/10ths 0-60 on the Gtec (4.11) without turning tyres. Then I did the "rubber" test.......improved a full twenty yards - both runs on MT Drag Radials LOL!! 
67 RO23 clone with 6.1 SRT Hemi and dual quads. Soon to have Drag Pak induction and Throttle body.
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Re: Holley calibration information needed
[Re: Moparmal]
#1579915
02/22/14 01:47 AM
02/22/14 01:47 AM
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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:
U were spot on Mr P!!
UPDATE - Swapped the 50cc pump to the secondaries and the 30cc to the primaries -
Improved 2/10ths 0-60 on the Gtec (4.11) without turning tyres.
Then I did the "rubber" test.......improved a full twenty yards - both runs on MT Drag Radials LOL!!
Cool... finish tweaking it in to get the best MPH
in the 1/4
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Re: Holley calibration information needed
[Re: Moparmal]
#1579916
02/22/14 12:37 PM
02/22/14 12:37 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
U were spot on Mr P!!
UPDATE - Swapped the 50cc pump to the secondaries and the 30cc to the primaries -
Improved 2/10ths 0-60 on the Gtec (4.11) without turning tyres.
Then I did the "rubber" test.......improved a full twenty yards - both runs on MT Drag Radials LOL!!
did you drop down on the squirter as well?
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Re: Holley calibration information needed
[Re: Mr.Yuck]
#1579917
02/23/14 05:26 AM
02/23/14 05:26 AM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
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Quote:
Quote:
U were spot on Mr P!!
UPDATE - Swapped the 50cc pump to the secondaries and the 30cc to the primaries -
Improved 2/10ths 0-60 on the Gtec (4.11) without turning tyres.
Then I did the "rubber" test.......improved a full twenty yards - both runs on MT Drag Radials LOL!!
did you drop down on the squirter as well?
My .034th squirters arrive tomorrow...so it'll be good to see what differences they make
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A lot of holleys in general are fat from what I`ve seen and my car runs cleaner and faster w/28 squirters and jetted/set up leaner on the idle and cruise circuit. If you can`t read plugs a wide band is your friend. Years ago Cab told me this; there`s 3-circuits on a carb(2-circuit) idle, cruise and wot so we`d set up the idle circuit first and read the plug idle only then make necessary changes. Then we`d work on the cruise circuit driving on primaries only and read the plugs then finally wot. Took a lot of work but w/out a wide band I don`t see any other way and although it`s not perfect, it`s a great reference tool and now my plugs look like the wide band indicated. Slightly rich at idle and cruise and nice at wot.......... 