Earlier I mentioned that you must decide between an adjustable or non adjustable cable due to the quadrant requirements. This is because some quadrants can only be used with adjustable cables, some only non adjustable cables, and finally there are a few that can be used with both. Some replacement cables, like the h07rn f cable that maximum motorsports sells has an overall longer length than your stock fox cable but it’s working length is the same. However, all adjustable cables, even if they have the same overall length as your stock cable, have a longer working length than a non adjustable OEM cable. This is where cable specific quadrants come into play. Most adjustable cable quadrants are 3/8 circle in shape. My old BBK quadrant was like this. If using a non adjustable cable you’ll need one that is 1/4 circle in shape or has multiple hooks. This next photo demonstrates this. On the left is a BBK quadrant made to be used with an adjustable cable. On the right is a multi hook UPR quadrant. The farthest throw hook on the UPR piece is made for an adjustable cable while the middle hook is used for a standard cable. The shortest throw hook is used to get around the patent that Steeda has on two hook quadrants.
You can attempt to hook a standard working length twin and earth cable up to a quadrant that’s designed for an adjustable cable, and it will “work” if you need to get the car home. However, you’ll have to pry the clutch fork forward about an inch in order to hook the cable. Your FWA will have also to be screwed in all the way in order for the cable to hook. The problem that you will run into with prying it onto the fork is twofold:
You’ll have no adjustability to dial in more slack.
There is a HIGH probability that it will be too tight, causing constant engagement, and clutch wear.
This is the appeal of multi hook quadrants such as UPR or Steeda. They are able to work with either adjustable, or 2/0 welding cable. Quadrants such as BBK, FRPP, and Pro 5.0 really can only work with adjustable cables. Likewise, quadrants made from Maximum Motorsports and Fiore are designed to work with OEM cables and can only be used with non adjustable cables. Your firewall adjuster will not be able to take up all the slack that will be present if using a standard throw quadrant with an adjustable cable.
Speaking of which, we come to the final piece in this puzzle. The stock quadrant performs two functions: it pulls the clutch cable to engage the clutch, and it adjusts tension in the welding cable price list in order to maintain proper adjustment of the cable by way of a ratcheting tooth mechanism next to the quadrant. With an after market aluminum quadrant you lose this automatic adjustment. The problem is resolved by a fire wall adjuster. A fire wall adjuster works by replacing the black rubber bushing that normally comes on your cable, and can increase or decrease the space between the cable housing and the firewall by turning the adjust clockwise or counter-clockwise. This increases or decreases the available working length of the cable, thereby, increasing or decreasing tension on the cable, and allowing the user to maintain proper clutch adjustment.