• Skip to main content
  • Skip to primary sidebar
  • Home
  • 2025 Racing Calendar
  • Checklists
  • Race Flags
  • Reading
    • Articles for racers
    • Handling Guide
    • Other Car Sites
  • For Sale
    • Cars For Sale
    • Parts, etc, For Sale
    • Misc
  • About
  • SPORTS RACER CHALLENGE

THINGS THAT GO VROOM

THROTTLE LINKAGE VS. THROTTLE CABLE

January 29, 2009 by Troy 3 Comments

A lot of older cars used throttle linkages instead of throttle cables. My 1971 Datsun 240Z was one of them. Linkage systems are usually quite robust and hold up to decades of abuse. Unfortunately in the 196os  and ’70s, they started using plastic pieces, usually the end caps, that sometimes break down, especially when frequently adjusted. And as you can imagine, these little plastic pieces are no longer available over the parts counter, so the only spares you can find is stuff left over from the junkyard. As you can see from the first picture, some linkage systems look like something out of the game “Mouse trap”.  I removed this one from my Z race car this week; it has six main components, with a dozen more smaller pieces.

throttle-cable-0011

So why did engineers use linkages instead of cables? I’m not sure if throttle cables broke more often in the early days, or if linkages just looked cooler, but a simple cable sure makes things cleaner and easier under the hood of my race car. I had to fabricate a plate to anchor the cable sleeve to since the hole in the firewall for the linkage was larger than the cable sleeve and retaining nut. I attached the cable to the end of the throttle pedal with a nice clevis pin that was part of the Lokar Universal Throttle Cable kit.

throttle-cable-005

Now you need two more pieces to complete the setup. A cable standoff bracket is required to anchor the other end of the cable sleeve. Fortunately I had a part that was easily modified into this bracket, however just about any piece of steel could be made into one. Then you need an arm to attach the cable end assembly to the throttle shaft. The cast aluminum one shown here is a piece made specifically for this application.  A little bit of fitting and adjusting, and I’ve got a much cleaner, trouble free throttle system for under $50.

throttle-cable-007

Another advantage of a throttle cable system over linkages is the increase in throttle control that it can offer.  By its nature, a multi-link system will eventually have  slop in it as each of its many components wear out. Along with the extra play in the system, a notchy feel can occur with this wear.  Another problem with a linkage system is that the engine is rigidly connected to the firewall through the linkage mounts. So as the engine rotates within the chassis due to hard acceleration or hard cornering, the throttle position actually changes without driver input. This effect is small, but measurable, and a throttle cable eliminates it entirely. If your racing class allows it, and you can handle the vibration, another solution to this problem would be the use of solid motor mounts.

throttle-cable-012

Filed Under: How To's & FAQs Tagged With: throttle cable

Reader Interactions

Comments

  1. Troy says

    March 5, 2016 at 12:23 pm

    Wolf Creek Racing

  2. Alan says

    February 29, 2016 at 1:06 pm

    Where did you buy that clamp-on lever?

  3. chris says

    September 19, 2011 at 3:36 am

    I spent 3 hours looking up this matter on various z forums and google image, i should have just came here first and saved the time. I have you boomarked for a reason. Thanks for the info!!

Leave a Reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

About This Site

Welcome to Things That Go Vroom … [read more]

Categories

Links I Like

Club Racing & Track Days

Other Car Blogs & Magazines

My Vendors’ Websites

Copyright © 2025 Things That Go Vroom