Q-Jet Accelerator Cable Stud Position
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
paul74,
How I determine where to put the stud ball on the linkage arm is this.
I look at how the cable is angled when it comes off the bracket. Is it going UP or LEVEL.
USING the center line of the cable....I take that out towards the carb linkage area...so I can see what hoel will work well.
NOW...depending on the linkage arm on the carb....just as an example. Lets say the hole in the linkage arm for the ball stud is at the 9 o'clock position when the linkage are is at idle. AND when you accelerate the linkage.....this HOLE goes UPWARDS due to the ARC that is going to occur when the linkage is accelerated.....and lets day....when you are at FULL THROTTLE ...the linkage stops at the 3 o'clock position.
Well I would make sure that my cable is going in a hole that allows FULL THROTTLE and not FIGHTING to get it to full throttle due to the angel of the cable and the placement of the ball stud.
By your photo....I honestly no one can say....because the variable of how the cable is coming out will determine which holes you use...then test to make sure you have full throttle.
AND many times...I have to modify the accelerator pedal arm so I get what I am looking for...and also modify the arm if the owner just HAS TO use thick floor mats all the time...which can effect pedal travel.
DUB
How I determine where to put the stud ball on the linkage arm is this.
I look at how the cable is angled when it comes off the bracket. Is it going UP or LEVEL.
USING the center line of the cable....I take that out towards the carb linkage area...so I can see what hoel will work well.
NOW...depending on the linkage arm on the carb....just as an example. Lets say the hole in the linkage arm for the ball stud is at the 9 o'clock position when the linkage are is at idle. AND when you accelerate the linkage.....this HOLE goes UPWARDS due to the ARC that is going to occur when the linkage is accelerated.....and lets day....when you are at FULL THROTTLE ...the linkage stops at the 3 o'clock position.
Well I would make sure that my cable is going in a hole that allows FULL THROTTLE and not FIGHTING to get it to full throttle due to the angel of the cable and the placement of the ball stud.
By your photo....I honestly no one can say....because the variable of how the cable is coming out will determine which holes you use...then test to make sure you have full throttle.
AND many times...I have to modify the accelerator pedal arm so I get what I am looking for...and also modify the arm if the owner just HAS TO use thick floor mats all the time...which can effect pedal travel.
DUB
Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
a little history on the position of it from past posts. i have mine in the lower (second) hole so i can get full open on my Q jet. it was in the top hole when i purchased the car.
https://www.corvetteforum.com/forums...r-hook-up.html
https://www.corvetteforum.com/forums...r-hook-up.html
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 99
From: Ontario
a little history on the position of it from past posts. i have mine in the lower (second) hole so i can get full open on my Q jet. it was in the top hole when i purchased the car.
https://www.corvetteforum.com/forums...r-hook-up.html
https://www.corvetteforum.com/forums...r-hook-up.html
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 99
From: Ontario
paul74,
How I determine where to put the stud ball on the linkage arm is this.
I look at how the cable is angled when it comes off the bracket. Is it going UP or LEVEL.
USING the center line of the cable....I take that out towards the carb linkage area...so I can see what hoel will work well.
NOW...depending on the linkage arm on the carb....just as an example. Lets say the hole in the linkage arm for the ball stud is at the 9 o'clock position when the linkage are is at idle. AND when you accelerate the linkage.....this HOLE goes UPWARDS due to the ARC that is going to occur when the linkage is accelerated.....and lets day....when you are at FULL THROTTLE ...the linkage stops at the 3 o'clock position.
Well I would make sure that my cable is going in a hole that allows FULL THROTTLE and not FIGHTING to get it to full throttle due to the angel of the cable and the placement of the ball stud.
By your photo....I honestly no one can say....because the variable of how the cable is coming out will determine which holes you use...then test to make sure you have full throttle.
AND many times...I have to modify the accelerator pedal arm so I get what I am looking for...and also modify the arm if the owner just HAS TO use thick floor mats all the time...which can effect pedal travel.
DUB
How I determine where to put the stud ball on the linkage arm is this.
I look at how the cable is angled when it comes off the bracket. Is it going UP or LEVEL.
USING the center line of the cable....I take that out towards the carb linkage area...so I can see what hoel will work well.
NOW...depending on the linkage arm on the carb....just as an example. Lets say the hole in the linkage arm for the ball stud is at the 9 o'clock position when the linkage are is at idle. AND when you accelerate the linkage.....this HOLE goes UPWARDS due to the ARC that is going to occur when the linkage is accelerated.....and lets day....when you are at FULL THROTTLE ...the linkage stops at the 3 o'clock position.
Well I would make sure that my cable is going in a hole that allows FULL THROTTLE and not FIGHTING to get it to full throttle due to the angel of the cable and the placement of the ball stud.
By your photo....I honestly no one can say....because the variable of how the cable is coming out will determine which holes you use...then test to make sure you have full throttle.
AND many times...I have to modify the accelerator pedal arm so I get what I am looking for...and also modify the arm if the owner just HAS TO use thick floor mats all the time...which can effect pedal travel.
DUB
I never drive my car hard...but once in awhile! And I never got the secondary whoophh last summer.
Edit* - Sometimes I do not get things right. I drove ~2,500 miles in 2014 with the stud in that position. Shows how often I put pedal to the floor!
Last edited by Paul L; Feb 5, 2015 at 08:10 PM.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Here is where it sits on my 78, but the 74 has an 4M rather than M4M, not to mention the throttle bracket may well be different. On my 78, the throttle stud is riveted or press fit, so there's really no way to goof up where you put it.
The long stud is for cruise. The hole one the inside of the boomerang, just below the cable sheath in the picture, would have been for a kickdown. (I have since converted to manual)
The long stud is for cruise. The hole one the inside of the boomerang, just below the cable sheath in the picture, would have been for a kickdown. (I have since converted to manual)
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