Carb trouble on ls1
09-29-2014, 02:46 PM
#1
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Carb trouble on ls1 Hey I'm new to this site so I don't know if there was a thread on it already I'm having trouble tuning in my carb with this motor I have a 5.3 silverado motor in my mustang wit a victor jr single plane intake holley 750hp double pumper ws6 stock heads with beehive springs and a Howard's nitrous cam specs are 281 284 advance. 226 232 @.50. Lift 578 587 at 1.7. And lobe is 115*. The trouble I'm having is a strong bog at anything under 3 grand above that it takes off like a raped ape. I tried all different thing upped the jets downed the jets upped squirters downed squirted changed pump cams. Just so frustrated wit it now anyone have any advice would be greatly appreciated thank you
09-29-2014, 05:17 PM
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I have the 50cc in back n 30cc up front. I thought the same to cause it originally had 30cc all the way around so I did the change n still does it. N yes when u stomp on gas from idle stumbles bad until above 3 grand dies the same even when cruising if under 3 n u step on it stumbles that comes alive above 3grand
09-29-2014, 06:24 PM
#5
A few things for you to consider:
My car needed to be jetting up several jet sizes from factory jetting when I switched from the Performer RPM to a Victor Jr.. A lean car will bog easier from not enough accelerator pump discharge nozzle than a rich car.
When it comes to placement of the 50cc pump, I prefer it in the front. Having it in the front allows it to get the fuel into the intake tract sooner than if it is in the rear as the the front throttle blades open first. When going WOT, the car needs the fuel sooner rather than later. Another thing that many don't know is that the 50cc accellerator pump needs the larger pump cam in order to utilize it's additional volume. If you just put on the pump without the cam, you will not get those extra 20ccs of fuel.
In regards to the accellerator pump discharge nozzles, tell us what size that you tried. For a point of reference, many of us use #37-#40 or .037-.040" nozzles. I use #40s. If you have drills small enough, you can drill them out as opposed to purchasing new.
My car needed to be jetting up several jet sizes from factory jetting when I switched from the Performer RPM to a Victor Jr.. A lean car will bog easier from not enough accelerator pump discharge nozzle than a rich car.
When it comes to placement of the 50cc pump, I prefer it in the front. Having it in the front allows it to get the fuel into the intake tract sooner than if it is in the rear as the the front throttle blades open first. When going WOT, the car needs the fuel sooner rather than later. Another thing that many don't know is that the 50cc accellerator pump needs the larger pump cam in order to utilize it's additional volume. If you just put on the pump without the cam, you will not get those extra 20ccs of fuel.
In regards to the accellerator pump discharge nozzles, tell us what size that you tried. For a point of reference, many of us use #37-#40 or .037-.040" nozzles. I use #40s. If you have drills small enough, you can drill them out as opposed to purchasing new.
09-29-2014, 07:45 PM
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I've been up and down with squirters cams and jets as of right now it was for the squirters 37 rear 28 up front blue cam in back and I believe pink up front and 76 jets in front and 88 I believe in back its been alittle while since I looked
09-29-2014, 07:46 PM
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09-29-2014, 07:49 PM
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A few things for you to consider:
My car needed to be jetting up several jet sizes from factory jetting when I switched from the Performer RPM to a Victor Jr.. A lean car will bog easier from not enough accelerator pump discharge nozzle than a rich car.
When it comes to placement of the 50cc pump, I prefer it in the front. Having it in the front allows it to get the fuel into the intake tract sooner than if it is in the rear as the the front throttle blades open first. When going WOT, the car needs the fuel sooner rather than later. Another thing that many don't know is that the 50cc accellerator pump needs the larger pump cam in order to utilize it's additional volume. If you just put on the pump without the cam, you will not get those extra 20ccs of fuel.
In regards to the accellerator pump discharge nozzles, tell us what size that you tried. For a point of reference, many of us use #37-#40 or .037-.040" nozzles. I use #40s. If you have drills small enough, you can drill them out as opposed to purchasing new.
My car needed to be jetting up several jet sizes from factory jetting when I switched from the Performer RPM to a Victor Jr.. A lean car will bog easier from not enough accelerator pump discharge nozzle than a rich car.
When it comes to placement of the 50cc pump, I prefer it in the front. Having it in the front allows it to get the fuel into the intake tract sooner than if it is in the rear as the the front throttle blades open first. When going WOT, the car needs the fuel sooner rather than later. Another thing that many don't know is that the 50cc accellerator pump needs the larger pump cam in order to utilize it's additional volume. If you just put on the pump without the cam, you will not get those extra 20ccs of fuel.
In regards to the accellerator pump discharge nozzles, tell us what size that you tried. For a point of reference, many of us use #37-#40 or .037-.040" nozzles. I use #40s. If you have drills small enough, you can drill them out as opposed to purchasing new.
09-29-2014, 07:50 PM
#9
What model carb do you have and what is the factory jetting?
I would start by putting 40 squirter nozzles from and back and getting the correct cam for the 50cc pump and putting it in front.
http://www.ebay.com/itm/HOLLEY-WIDE-50cc-ACCELERATOR-PUMP-CAM-664-AED-BG-DEMON-GRANT-QFT-CARBS-/400777717377?_trksid=p2054897.l4275
I would start by putting 40 squirter nozzles from and back and getting the correct cam for the 50cc pump and putting it in front.
http://www.ebay.com/itm/HOLLEY-WIDE-50cc-ACCELERATOR-PUMP-CAM-664-AED-BG-DEMON-GRANT-QFT-CARBS-/400777717377?_trksid=p2054897.l4275
09-29-2014, 08:04 PM
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What model carb do you have and what is the factory jetting?
I would start by putting 40 squirter nozzles from and back and getting the correct cam for the 50cc pump and putting it in front.
http://www.ebay.com/itm/HOLLEY-WIDE-50cc-ACCELERATOR-PUMP-CAM-664-AED-BG-DEMON-GRANT-QFT-CARBS-/400777717377?_trksid=p2054897.l4275
I would start by putting 40 squirter nozzles from and back and getting the correct cam for the 50cc pump and putting it in front.
http://www.ebay.com/itm/HOLLEY-WIDE-50cc-ACCELERATOR-PUMP-CAM-664-AED-BG-DEMON-GRANT-QFT-CARBS-/400777717377?_trksid=p2054897.l4275
09-29-2014, 08:09 PM
#12
Try the cam and squirters. I am betting that solves your problem. Leave the powervalve plugged in the rear. The front powervalve sizing is for drivability and part throttle fuel economy. The short and dirty way to select a powervalve is to run the lowest number you can that doesn't cause it to rattle or hesitate at part throttle.
Yes. The one in the picture. You will know it when you see it. It dwarfs the other cams in height.
Yes. The one in the picture. You will know it when you see it. It dwarfs the other cams in height.
09-29-2014, 08:20 PM
#13
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Ok ill try that. 40 front and back brown cam for the 50cc pump and put the 50cc pump up front? Should I leave my jets alone the way I have them or what would be a good starting point for that set up thanks for all ur help so far
09-30-2014, 06:00 AM
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