Cliff's Quadrajet Parts and Rebuild Kits

Quadrajet Problem Solving => Dialing in your rebuilt Quadrajet carburetor => Topic started by: jvmagic on October 14, 2020, 10:24:21 AM

Title: Secondary flaps
Post by: jvmagic on October 14, 2020, 10:24:21 AM

Hi,

The q-jet was rebuilt two years ago along with having the distributor rebuilt with advanced timing (34 @ 2800 rpm) from two different companies.  Anyway, the car runs well but I'm wondering if the secondary flaps can open sooner for better performance.  My car is stock (low mileage car; 36k miles).  Any advice is appreciated. 

79' Pontiac Trans Am
403 olds motor
th350 trans
2.41 gears soon to be 2.73 (for asthetics; disc rear)

no load video
https://www.youtube.com/watch?v=D4YxIJp0PsU

Title: Re: Secondary flaps
Post by: jvmagic on October 20, 2020, 10:51:15 AM

TTT

In case there is some improvement to be had.  Thanks

Title: Re: Secondary flaps
Post by: Kenth on October 20, 2020, 02:12:06 PM

For testing you may loosen the preload on air valves spring 1/8 turn at a time until it bogs then tighten 1/8 turn.
If you have CV, AU or CK secondary rods you might want to use a set of DA or CE.

Title: Re: Secondary flaps
Post by: jvmagic on October 21, 2020, 08:58:14 AM

Quote from: Kenth on October 20, 2020, 02:12:06 PM

For testing you may loosen the preload on air valves spring 1/8 turn at a time until it bogs then tighten 1/8 turn.
If you have CV, AU or CK secondary rods you might want to use a set of DA or CE.

Thanks for your reply.  I'll have to try this.  The second part of my question would be 'is this a worthwhile mod'?