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  • 2 weeks later...
  • 2 weeks later...

Throttle application seems accelerated, as in 1/3 is half.

The TPS has nothing to do with the feel of Throttle sensitivity. TB sizing and linkage do.

 

Send us a picture and specs of your TB and linkage. Most problems with a TB that is too sensitive have to do with improper linkage angles or too large of a TB diameter for the engine size. Cable linkages are usually " easier " to drive than the OEM Pushrod style, because you can use a rotary style cam. These cams can also be made asymmetrical, allowing a slow gradual pull at first then ramping up later in the pedal travel. 

 

http://victorylibrary.com/mopar/TB-linkage-c.htm

 

Click on thumbnails to enlarge:

 

throttle-cam.jpg

 

2009-2529-1.jpg

Edited by Chickenman
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Thanks for the info.

 

We are using  a Nissan 240sx throttle body. Throttle cable is a universal cable in sheath. Has the boxed ended input into the 240sx. Gas pedal arm is attached to the cable.

 

Here are a few pictures. Kinda gives idea on what we did to change the linkage over to a cable and modern cam gear drive.

post-41758-0-34156400-1455411064_thumb.jpg

post-41758-0-41278900-1455411078_thumb.jpg

post-41758-0-25883700-1455411106_thumb.jpg

post-41758-0-53925600-1455411116_thumb.jpg

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Doesn't look too bad. Is that the stock cable mounting location?

 

You may want to change the angle of the cable a bit, maybe raise it up some so it's not pulling at such an acute angle relative to the bell-crank. That may smooth out the first few degrees of travel.

 

You could also try using the outer Cam, with has a larger radius and should smooth things out a bit.

 

All sorts of asymmetrical throttle cams available on E-Bay. BMW also have a very asymmetrical Bell-crank that you could adapt. Click on picture to enlarge:

 

Cable-throttle-linkage-cam.jpg

Edited by Chickenman
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  • 1 month later...

Doesn't look too bad. Is that the stock cable mounting location?

 

You may want to change the angle of the cable a bit, maybe raise it up some so it's not pulling at such an acute angle relative to the bell-crank. That may smooth out the first few degrees of travel.

 

You could also try using the outer Cam, with has a larger radius and should smooth things out a bit.

 

All sorts of asymmetrical throttle cams available on E-Bay. BMW also have a very asymmetrical Bell-crank that you could adapt. Click on picture to enlarge:

 

Cable-throttle-linkage-cam.jpg

 

 

Thanks for the idea, son is moving to Georgia close to me and will  be working on it more with tooquick260

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