Dual quad Edelbrock tuning...

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j par

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I have a Carter performance 625 on the back as my primary and a 1406 on the front. I have the same metering rods Jets and springs in both. I have 92 jets in the secondaries and 95 in the front with 7547 metering rods. I have the medium Springs #3.
I have a wideband O2 sensor in the driver side exhaust. I did two adjustments as always LOL and put the 7547 metering rods in in lieu of the 7147's and brought the idle almost up to the 14-7 I would like it to be. But at the same time I put the number 4 heavier Springs in and it made the secondaries go away lean and lose power. I put the number three Springs back in and everything kind of went back to normal with the idle again at 14 5 or so and at cruise speed it was around 13 2 to 13 7 but again wot was down to about 11 2 to 10 9. At this point I'm thinking getting the 89 jets for the secondaries and trying to get that wide open throttle up to a 12 5 where I want it. Also I have all the vacuum capabilities plugged all the way around the carburetors and I'm just wondering if these economy carburetors would rather have the rear vacuum ports going into a PCV valve and getting a little more air? On the passenger side I run an Evac out of that exhaust and an open breather on the driver side. Anyone's thoughts and experiences would sure be appreciated as this year I want to get these carburetors exactly the way they should be..
Thank you..
 
Why do you have bigger jets in the primaries (95) than the secondaries? (92)
 
Carter and Edelbrock carbs usually have the bigger jet in the primary side. There is a metering rod stuck in it most of the time.
 
Carter and Edelbrock carbs usually have the bigger jet in the primary side. There is a metering rod stuck in it most of the time.
Ahhh… ok. Then I would still richen the secondaries……
 
Is your throttle linkage progressive or direct?
It's 1 to 1 or as you put it Direct now but I've ran it Progressive... The progressive makes it a little bit more easy to manage with the clutch as far as Street manners go but I still prefer one to one...
 
It's 1 to 1 or as you put it Direct now but I've ran it Progressive... The progressive makes it a little bit more easy to manage with the clutch as far as Street manners go but I still prefer one to one...
ok, I think for the street and gas mileage progressive may be more optional. Don't need to be working two accelerator pumps all the time. Direct is more All out race.
 
ok, I think for the street and gas mileage progressive may be more optional. Don't need to be working two accelerator pumps all the time. Direct is more All out race.
That's rich excuse the pun gas mileage with dual quads LOL...
 
That's rich excuse the pun gas mileage with dual quads LOL...
But just for the record, I can put 7 gallons in my 360 Duster, drive 1 hr to the strip, run it through 4 - 5 times, and easily make the 1 hr drive back home.
 
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