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progressive throttle on throttle bodies
madteg - 28/6/10 at 09:15 PM

Has anybody made a progressive linkage as i have trouble driving around town, have put it down to the bike linkage on my fireblade Tbs. Any pictures welcome

beaver34 - 28/6/10 at 09:17 PM

i have same issue with my busa ones

SeaBass - 28/6/10 at 09:20 PM

Snail Cam for the cable to sit round?

flak monkey - 28/6/10 at 09:21 PM

Buy some proper car oriented ones with the correct initial closed throttle angle on the plates is the only real way to solve the problem.

Hence why I ended up scrapping bike throttle bodies entirely and going back to car ones.

David

beaver34 - 28/6/10 at 09:27 PM

quote:
Originally posted by flak monkey
Buy some proper car oriented ones with the correct initial closed throttle angle on the plates is the only real way to solve the problem.

Hence why I ended up scrapping bike throttle bodies entirely and going back to car ones.

David


true, although bike ones seem to make more power, mine did over a set of jenveys

zilspeed - 28/6/10 at 09:35 PM

I had this conversation yesterday with AndyW7DE regarding the throttles on his car.
Progression does seem to be an issue.

matt_gsxr - 28/6/10 at 09:38 PM

The standard gsxr have a progressive linkage as the throttle cable runs on an elliptical wheel. You could follow their route.

Its worth checking the following:

Make sure the balance is 100% perfect, as imbalance messes things up.

Make sure the linkages from one body to the next are perfectly set-up so that when you move the throttle cable end that the butterfly on the other ends moves at the same time (no slack).

Get the TPS so that it responds immediately to the smallest of throttle motions.

Reduce the idle ignition advance. This means you have more idle throttle opening than the minimum, but makes the engine less sensitive to initial openings.

More throttle travel, and reduced gearing.


Or, don't go into town and just blast around the lanes!


Matt

clairetoo - 28/6/10 at 09:40 PM

I think this is usually caused by the throttle bodies being too big for the engine - I ran 35mm `bodies on a 1700 crossflow , never had any issues , but 40mm on a 1.8 V6 were close to undrivable around town .
But the same TB setup on a 2.5 and it is perfect .
I make the map go up in very small steps from closed throttle - the lower half of my map covers no more than 15% of throttle opening , with map getting progressively steeper towards full throttle .

DIY Si - 29/6/10 at 03:51 PM

You could always use the snail cam from any old SU carb. I did when I switched to a webber and I was told it was much nicer than other cars to drive.

beaver34 - 7/7/10 at 08:09 PM

any pics of the above ideas?

want to sort mine out