Accufab Throttle Body
Thread Starter
3rd Gear Member
Joined: Aug 2008
Posts: 883
From: Washington
Accufab Throttle Body
I just installed an Accufab TB on my Mach 1 and the throttle feels much firmer, as in its harder to push the gas pedal. Is this right? It must have a stronger spring. Also when you press the pedal all the way it kinda drops into a point of what I would call past full throttle because it is not giving the car any more throttle. Does it just need some addjusting or is this normal. What do ou guys think, I know some of you have upgraded your TB. - Thanks
6th Gear Member
Joined: Mar 2007
Posts: 6,169
From: Chicago, IL
Sounds like it may need some adjusting. I had the same one on my mach and I remember I talked to a member on mach1 registry and he told me to adjust it, I don't remember what I did thou, since it was a long time ago. It's better if you just take your stock throttle body and port that. To many sticking problems with after market TB's.
6th Gear Member
Joined: Oct 2006
Posts: 10,551
From: Texas
Sounds like it may need some adjusting. I had the same one on my mach and I remember I talked to a member on mach1 registry and he told me to adjust it, I don't remember what I did thou, since it was a long time ago. It's better if you just take your stock throttle body and port that. To many sticking problems with after market TB's.
OP you most likely are just feeling the tad stiffer spring on the TB.
5th Gear Member
Joined: Aug 2007
Posts: 3,189
From:
well you have a cable pulling the lever on the side which rotates the butterfly. i dont know if its even posible or its your imagination but if you pulled too hard it may not have a stop at perpendicular and could rotate to a more closed position.
take your intake hose off and have a friend floor your car (motor off). see what the butterfly does. maybe you just need to adjust the cable a little bit.
take your intake hose off and have a friend floor your car (motor off). see what the butterfly does. maybe you just need to adjust the cable a little bit.
TECH SAVANT
Joined: Dec 2006
Posts: 10,937
From: Saint Augustine, FL
The plate's sticking (if it is) can be caused by incorrect adjustment of the throttle stop screw--here is the procedure for setting same...
The power loss or limit you describe could perhaps be caused by a maladjusted cable, the visual inspection mentioned above will quickly reveal this, however there may be another explanation.
Did you get a 70mm or 75mm TB, are you still running the stock upper plenum?
I ask because at higher engine speeds, at WOT with the 2V engine, a 75mm TB can be a bit of overkill and cause the intake charge velocity to drop, with a related performance drop or feeling of hitting a power "wall".
A 75mm TB used with the stock upper plenum will exacerbate this effect.
The power loss or limit you describe could perhaps be caused by a maladjusted cable, the visual inspection mentioned above will quickly reveal this, however there may be another explanation.
Did you get a 70mm or 75mm TB, are you still running the stock upper plenum?
I ask because at higher engine speeds, at WOT with the 2V engine, a 75mm TB can be a bit of overkill and cause the intake charge velocity to drop, with a related performance drop or feeling of hitting a power "wall".
A 75mm TB used with the stock upper plenum will exacerbate this effect.
Thread Starter
3rd Gear Member
Joined: Aug 2008
Posts: 883
From: Washington
The plate's sticking (if it is) can be caused by incorrect adjustment of the throttle stop screw--here is the procedure for setting same...
The power loss or limit you describe could perhaps be caused by a maladjusted cable, the visual inspection mentioned above will quickly reveal this, however there may be another explanation.
Did you get a 70mm or 75mm TB, are you still running the stock upper plenum?
I ask because at higher engine speeds, at WOT with the 2V engine, a 75mm TB can be a bit of overkill and cause the intake charge velocity to drop, with a related performance drop or feeling of hitting a power "wall".
A 75mm TB used with the stock upper plenum will exacerbate this effect.
The power loss or limit you describe could perhaps be caused by a maladjusted cable, the visual inspection mentioned above will quickly reveal this, however there may be another explanation.
Did you get a 70mm or 75mm TB, are you still running the stock upper plenum?
I ask because at higher engine speeds, at WOT with the 2V engine, a 75mm TB can be a bit of overkill and cause the intake charge velocity to drop, with a related performance drop or feeling of hitting a power "wall".
A 75mm TB used with the stock upper plenum will exacerbate this effect.
TECH SAVANT
Joined: Dec 2006
Posts: 10,937
From: Saint Augustine, FL
1st Gear Member
Joined: Aug 2008
Posts: 52
From: North Alabama
The plate's sticking (if it is) can be caused by incorrect adjustment of the throttle stop screw--here is the procedure for setting same...
The power loss or limit you describe could perhaps be caused by a maladjusted cable, the visual inspection mentioned above will quickly reveal this, however there may be another explanation.
Did you get a 70mm or 75mm TB, are you still running the stock upper plenum?
I ask because at higher engine speeds, at WOT with the 2V engine, a 75mm TB can be a bit of overkill and cause the intake charge velocity to drop, with a related performance drop or feeling of hitting a power "wall".
A 75mm TB used with the stock upper plenum will exacerbate this effect.
The power loss or limit you describe could perhaps be caused by a maladjusted cable, the visual inspection mentioned above will quickly reveal this, however there may be another explanation.
Did you get a 70mm or 75mm TB, are you still running the stock upper plenum?
I ask because at higher engine speeds, at WOT with the 2V engine, a 75mm TB can be a bit of overkill and cause the intake charge velocity to drop, with a related performance drop or feeling of hitting a power "wall".
A 75mm TB used with the stock upper plenum will exacerbate this effect.
Thanks cliffy for posting the link, im getting an accufab next week and this might be helpful.
Thread Starter
3rd Gear Member
Joined: Aug 2008
Posts: 883
From: Washington
I had the throttle cable on just slightly wrong lol. throttle problem fixed! Now why does my car whistle while the engine decelerates and when it is warming up lol? If I read correctly, their Accufabs website states that they have made them so that they will not whistle... Any kinda fix for this?