i know the TPS is usually mounted on the carb/throttle body butterfly shaft, or somewhere in that area. can't think of a good place to put them on my bike carbs, so how about on the throttle pedal?

i can't think of any reason why not...

does it need to rotate 90degrees to give the necessary change in impedance, or can it be tuned to the necessary range with the ecu software?

if it can't, that may be where your problem lies.
tom

ah, good point it would be for megajolt, so can be calibrated i think.

the bigger the range the more accurate it would be i guess, maybe some kind of gearing could help? don't know if thats getting a bit too complicated, but i really can't think of finding a way to make it work on the carbs (zzr1100)

The only other problem I can think of is the play in the pedal; usually there is some meaning that the TPS might think the throttles opening when in fact it hasn't done so yet. My old cortina had no play in the pedal, it was a bit jumpy like that.

Not a good idea to operate a TPS from the pedal (unless fly by wire system), unless all pivots and cable mountings are 100% rigid then friction in the cable will cause the pedal position to change slightly in relation the throttle position. Cable stretch etc. will just make things worse.

hmmm, all very good points. cheers guys

anyone ever managed to fit one to zzr1100 carbs?

if your struggling for space, how about a small link bar from the throutle plate to the TPS, that way you could put the sensor elsewhere and not have the cable/pedal issues.

Ive fitted one. Not hugely successful. Needs a slight tweak.

here's the carbs

carb

there must be a way, but i can't think of a way of having the shaft, that turns the butterflies, sticking out the end of one of the end carbs. unless anyone supplies kits to respace them, in which case i might be able to buy a longer shaft...

Whippy, how to you mean with this link bar?

I think Mr Whippy means mount the TPS on a bracket somewhere near the main linkage, fit a bellcrank onto the TPS and attach the other end to the throttle linkage i.e. you operate the TPS via a push/pull rod rather than trying to attach it directly to the throttle spindle.

On the end of the throttle spindle there is a metal cap. I prised this off on one end. Drilled and tapped the end of the shaft (M5 iirc - not too deep though!). Threadlocked a stud in the end (not too much threadlock - you dont want it on outside of spindle). Boggs made bracket for the TPS on the manifold.

I used the TPS as supplied with my megajolt - basically a plastic shafted potentiometer. Secured this to the bracket and used a piece of tube for the connection.

Took some experimentation to get the tube rigid enough. First was soft = crap. Next too rigid and snapped pot shaft. I tried jubilee clips to secure - too chunky. Supergluing tube to pot has worked best.

The big bit i ommitted to realise is;
1. Carbs are not rigidly secured to the manifold and can move - not good when TPS is rigid on the manifold.
2. When you need to remove carbs during set up - ie at rolling road - you lose the TPS register and unless you have loads of time to calibrate it back in its a PITA.

So far im running in 2D mode which is better that the dizzy ever was.

What id like to do at some point is mount the zetec TPS i have spare onto the manifold bracket but on some form of resilient mount (slightly flexible) and use a link bar in between that is solid (eg steel) but not directly fixed to shaft or TPS (held between).

Other option is to file the tps drive shape in the end of the stud to locate directly to TPS and somehow get this mounted onto the carbs themselves - a lot easier to type than do.
Later ZZR carbs had TPS built in but ive not had the pleasure of seeing how this was achieved. I suspect the throttle shaft is longer on one carb and there is some mounting holes cast into the body.

cheers darren! i'll have a look at that tonight
there should be some way of attaching the TPS to the carb i would think.

I fitted a TPS to our Carbs similar to the way the Darren has described. There are some photo's on THIS THREAD

HTH.

oooh, thats a good thread! cheers for the link!