20V throttle linkage concept 1 - down-pull: Currently there is a redundant Japanese linkage kit available second hand that moves the throttle cable to being under the throttles and negates the need for the original top linkages. This gives a much neater appearance on top, a more direct throttle feel due to the loss of linkage slop and can also allow for a nicer throttle cable path for those with a Left-hand drive car. While there have been a few copies of this product from other sources they all look to be a identical design with the downsides it brings. With that in mind and the fact that we don't wish to copy anything a clean sheet approach was taken to design something new. Here are the key advantages:
- Slotted hole over just a slide in mount for the throttle cable support in the top of the support bracket:
A simple change but this would completely stop the throttle cable from being able to slide off from a nut coming loose alone.
- Completely altered bracket shape (rough design pictured):
- Tilted throttle cable angle: With a whole new bracket design came the option to tilt the throttle cable further down, this means that the throttle cable can clear something like the GTIR air box adapter that's currently available or a similar sized airbox.
- Universal mounting: Not all people with 20V throttles have 4AGE engines and not all are using the original 4AGE bore spacing. This kit allows for up to a 6mm wider spacing between the middle throttles and still bolt up without any adjustment being needed.
Here is the concept model for the basic down-pull linkage that bolts without modifications to the throttle body:
20V throttle linkage concept 2 - reversed down-pull
for all those who have inverted throttles and likely 20V's in MR2's: Near all 16V 4AGE quad throttle and various other manifolds hold the throttles upside down. In a right hand drive car like a Sprinter or Corolla it results in two very harsh bends in the throttle cable. This causes a hard and unresponsive pedal feel. The MR2 20V engine installs on the other hand may have the cable on top but still have the cable mounts modified to an awkward shape for the original cable to reach.
With a different version of the same linkage concept:
along with a new bracket this lets the cable pull from the same direction as the original 20V middle linkage. But instead of this being translated to a sideways direction which is what causes the issues it keeps the cable going straight out.
For 16V 4age owners this means the throttle cable can throw a nice gentle curve and completely stay away from the firewall. For MR2 owners on the other hand it should allow for a very direct path for the cable without any custom work- tested wanted!
3SGE BEAMS quad throttle manifolds: Things didn't work out with the packaging of the prototype adapter. A new version of the adapter will be designed and tested as soon as possible.
16V quad throttle manifold test: Shortly a prototype 16V 4age quad throttle manifold will be made and torture tested for one month minimum. To do so this will be without any throttle to block, flange to intermediate brace locating dowels and with a nice heavy chunk of steel bolted to the bottom. If it survives this then I would think it could survive what my customers can give it for many years.
