Doh! What I meant was syncromesh! No syncromesh on bike!
Bugger!
Guys,
Anybody had any experience with a Sequential gearbox flatshift system for a CAR not bike.
I've found plenty that do bike engines but the few for cars are REAL expensive.
Need a cheaper solution that is known to work?
Cheers
Tigger
Tigger
What's stopping you using a bike one? Can't the parameters be adjusted for the different rev ranges?
I know it's drastic but you could use a different ECU that has a built in flat shift facility!
Wyn
sequential dog engagement gearbox avaliable from quaife but are definitley not cheap, (over £2k)
IIRC bike gearboxes are sequential dog engagement as standard to you can get away with flat shifting them
basicaly synchromeshes dont like to like to work fast
Bike boxes are non sequential and normally have straight cut gears, with the gear reduction from the clutch drum they get a bit easier life.
quote:
Originally posted by coozer
Bike boxes are non sequential and normally have straight cut gears, with the gear reduction from the clutch drum they get a bit easier life.
Yes, bike 'boxes are sequential. Hence you can do clutchless gearchanges if they are not under load. For example when going for it at full chat
on my 'Busa the exceleration forces are so great that I cannot release my grip in the bar to grab the clutch however by snapping the throttle off
then on again while applying pressure to the gear lever I can get a really quick change and stay 'on it'.
Same principle for car sequentials so long as the linkage allows you to apply sufficient force to make the change. Flappy paddles are probably a bit
more of an issue as you probably need powered actuators to make the change otherwise the paddles will probably be to stiff.
I drove a mate's ex Clio Cup race car last week. It has a sequential box with ignition cut for clutchless flat shfting. On the downshift it needs
the clutch. However, it's not cheap. Made by Sadev if I remember correctly. There's a company that sells/refurbs them:
http://www.swrmotorsport.com/main/6_speed_sequential.htm
OMEX ECUs have the feature at least the 600 and 710 do. Not clutchless though just keep your foot planted and when you de-clutch a sensor on the pedal signals the ECU to back off the timing. I've not used it on my car but I have driven the OMEX CEC Striker with it enabled.
quote:
OMEX ECUs have the feature at least the 600 and 710 do. Not clutchless though just keep your foot planted and when you de-clutch a sensor on the pedal signals the ECU to back off the timing.
A power break to unload the dogs is the key bit otherwise you stand a good chance of knakering the retention tip and it'll stop holding the gear
in.
On upshift cutting the spark or dipping the clutch breaks provides the unload.
On downshifts you can do the same with a throttle blip applied when shifting (actuated shifting).
If you want a really cheap and home made version of a spark cut for a non-actuated shift, you could always fit a sensor on the shift lever through an
on latched micro timer and a solid state relay for spark cutting.
Work out how long your slowest shift takes and set the timer to say 20ms longer than this. When you pull the lever the timer circuit will cut the
spark and connected it back after you've released the lever and made the gear.
I wont be lightest or foolproof though.
Sorry chaps was looking at a blonde in the office and had a moment.... Doh!
What I meant was syncromesh! No syncromesh on bike!
Bugger!
Very old thread i know, Flatshifter in the uk do clutchless up and down gearshift systems for any vehicle using a sequential gearbox ie Hewland Sadev, Elite, Quaife etc etc as well as bike engines.www.flatshifter.com