Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

shaker scoop messing with carb tuning?

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BanditRich:
I'm going to try that. I had noticed the old paper filter which has yellowed from age said CarQuest on the plastic ring so I got a new one from Advanced Auto which is supposed to be the correct one for my car but I noticed it looked a lot taller than the old one. So I measured the old one and it was 2 3/4" tall; the new one was 3 1/16". I also called Ames Performance to send back the one I ordered from them that was supposed to be correct ( it was 2 1/2" x 11" and the aircleaner lid stuck  out over the top - my car REALLY didn't like that one when I took it for a test drive) and got one that was specified for 76 Trans Ams - 3" x 14".
When I tried to put the new CarQuest one on the shaker retaining ring would not seal the scoop to the aircleaner. So I tried the 3" tall one from Ames Performance and the ring worked with that one as expected because the K&N one I have is 3" tall too.
So I took the car for a spin and my car likes that one a lot. Takeoff from a dead stop is great and if I'm doing 20 - 30 and nail it the downshift and acceleration is downright violent!
It has the slightest of lag from dead stop with the secondary air valve spring at 1/2  turn but it's so minor I'm debating whether to bother adjusting it because of how hard it was to loosen & then tighten the locking allen screw ( it isn't rusted it just took a lot of upward pressure while simultaneously turning it to get it to loosen and then tighten - it would just turn both ways without loosening or tightening back up without the upward pressure) as I stated in the other thread.
Now to try your custom foam filter in the shaker and snorkel without the aircleaner lid to see if my car likes that even better. I will post up here how that works out.
I think the reason my car got better acceleration with the old yellowed paper filter than the K&N one I have is that the old paper one was 2 3/4" and there probably was a small gap between the top of the filter and the aircleaner lid; whereas it was tight against the K&N one so it was akin to the old hotrodder trick of flipping the aircleaner lid.
But my car accelerates way faster with the new 3" paper filter than the old 2 3/4" one; or the 3" tall K&N one  ;D  Looking forward to see how the foam in the shaker and snorkel works out without the aircleaner lid!

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