need help
05-13-08, 02:36 AM
#1
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need help
ok i have a 12a in my 1st gen rx7 and the mods are
street port
racing beat manifold
racing beat header
racing beat exhaust
holly 650 carb
ok the car needs to get tuned so i need help on tuning the 650 holly any one out there that can help me or should i change the carb to something better. lmk what you think. THANKZ
street port
racing beat manifold
racing beat header
racing beat exhaust
holly 650 carb
ok the car needs to get tuned so i need help on tuning the 650 holly any one out there that can help me or should i change the carb to something better. lmk what you think. THANKZ
05-14-08, 07:41 PM
#5
I dont know much about the Holley carbs, but the Weber has 3 total jets X2 (front and rear rotor) for 3 RPM ranges. Idle, mid, high/full throttle
It probably works about the same for the Holley.
You put the wide band in, start the car and let it idle until it gets to normal operating temp. Now is it lean or rich? change the idle jet to get it close then fine tune the mixture screw to get where you want.
Now drive it in low to mid range RPM and throttle. Rich or lean on the wide band? Change the main jet to get it where you want.
Now play a little with full throttle, is it rich or lean in the upper revs? Change the air corrector jet to get it right.
There should be a similar procedure for the Holley, but I think the jets are much more work to get to.
If you have a wide band you can literally road tune a Weber carb in less than 15 minutes.
It probably works about the same for the Holley.
You put the wide band in, start the car and let it idle until it gets to normal operating temp. Now is it lean or rich? change the idle jet to get it close then fine tune the mixture screw to get where you want.
Now drive it in low to mid range RPM and throttle. Rich or lean on the wide band? Change the main jet to get it where you want.
Now play a little with full throttle, is it rich or lean in the upper revs? Change the air corrector jet to get it right.
There should be a similar procedure for the Holley, but I think the jets are much more work to get to.
If you have a wide band you can literally road tune a Weber carb in less than 15 minutes.
05-14-08, 08:51 PM
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05-14-08, 10:02 PM
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Check the Power Valve. I am researching issues with my engine and ran into the posibility that it could be the Holley Power Valve. The description of the symtoms I found was:
"See if this description sounds familiar: Your Holley-carbureted street car idles terribly, has taken to fouling spark plugs every week or so, the gas mileage absolutely sucks, and there’s an ominous black cloud swirling from your exhaust. If any of these descriptions fit your Holley carb–equipped street or race car, you probably have a blown power valve."
"See if this description sounds familiar: Your Holley-carbureted street car idles terribly, has taken to fouling spark plugs every week or so, the gas mileage absolutely sucks, and there’s an ominous black cloud swirling from your exhaust. If any of these descriptions fit your Holley carb–equipped street or race car, you probably have a blown power valve."