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07-09-2009, 09:51 PM | #26 | |
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Re: holly carberator OPEN ME UP AND READ ME
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With cruise mixture, I like to lean it out until it surges at highway speeds, and then make it a reasonable amount richer than that. For accelerating, it's pretty safe to say that if it feels sluggish, it's probably rich. If you get a complete "falls on it's face" dead-spot, and then it picks up, it's probably lean. For idle mixture, start at a set amount of turns out on each screw (2 turns?) then, open one screw a 1/4 turn, then the other 1/4 turn... Did the idle increase? If it increased, go another 1/4 turn on each screw... is it still increasing? You will have to keep turning the idle speed down if the idle keeps increasing with the turns on your mixture screws. When you get to the point that opening the screws any further doesn't increase idle speed, it's pretty close; at this point you could probably turn each screw in a small amount just to lean out the idle a tad. If you have a vacuum gauge, you can use the above procedure, but set the idle screws to maintain a maximum vacuum reading (you'll still want to keep dialing back the idle speed when changing the mixture screws). In my hunt for a near perfect tune, I picked up a wideband O2 controller. I went wit a JAW DIY system. I have less than $150 in it, and so far, it seems to be worth every penny. It takes all the guessing out of the equation. |
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07-09-2009, 09:54 PM | #27 | |
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Re: holly carberator OPEN ME UP AND READ ME
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If you find any from 77+ (non computer controlled) I'd take a few! Look me up! Last edited by Jim_PA; 07-09-2009 at 09:54 PM. |
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07-09-2009, 09:56 PM | #28 |
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Re: holly carberator OPEN ME UP AND READ ME
If you're talking about me, my quadrajet is stock and needs the casting plug expoxied. Alot of them leak down, one reason they're called the quadraflood. My dad has had a couple quads including a '71 c10 that did the same. His mechanic friend back in the day expoxied it and it was fixed.
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'72 cheyenne super step, '05 long bed gmc |
07-09-2009, 10:10 PM | #29 |
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Re: holly carberator OPEN ME UP AND READ ME
with jim pa, i have always used a vacumn guage to set a carb. pull the pvc line and turn the air/fuel screws to get max vacumn. this will change your idle a bit and adjust accordingly nothing wrong with a qjet they worked for years. IMHO
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69 short fleet 350/350 "under construction" 70 short step 307/3 speed |
07-09-2009, 10:10 PM | #30 |
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Re: holly carberator OPEN ME UP AND READ ME
Never heard of the quadraflood. I do know that they are probably one of the most over-tightened carbs out there and easy to warp.
Jim...I also know that 14.2 in a truck is quick! Are we talking short or longbed? 'course you got some good heads and that's darn near 1/2 the power equation. Quick in and quick out. If you get in the 13's you are moving. Best case is you are around 3,800 to 4,000 lbs with driver. |
07-09-2009, 10:32 PM | #31 | |
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Re: holly carberator OPEN ME UP AND READ ME
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