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2 Nov 2004, 19:55 (Ref:1143180)
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#1 | ||
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Racer
Join Date: Aug 2003
Posts: 167
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Throttle blippers for clutchless downshifts
Our recent Electro pneumatic paddle shift system thread got me to thinking so I quickly sketched up a pneumatic system for shifting gears on a motorcycle 'box.
Easy enough to do full throttle, clutchless upshifts, the gear up paddle need only activate a spark cut when pressed to take the stress out of the 'box's shafts whilst the gear's banged in. However clutchless downshifts are a different story; I need some kind of throttle blipper to match engine revs during the shift. Does anyone make these things for throttle bodies not equipped with fly-by-wire? A quick Google didn't reveal anything obvious. |
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__________________
"Ah," said Dirk "it is a rare mind indeed that can render the hitherto non-existent blindingly obvious." 
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2 Nov 2004, 20:05 (Ref:1143198)
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#2 | ||
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Registered User
Veteran
Join Date: Apr 2004
Posts: 801
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Throttle kickers are fairly common when using anti-lag systems on turbocharged engines. Try this link for some help.
http://www.autronic.com/technical_da...es/antilag.pdf |
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3 Nov 2004, 09:22 (Ref:1143635)
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Racer
Join Date: May 2002
Posts: 153
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Yeah, you can use solenoids, but then you have to go and find one that's big enough and strong enough to do the job and then you've got to work out the switch.
If you're talking pnuematics already, think vaccum operated plungers, some cars use these sorts of things for opening a second set of throttle plates (think toyota 4AGE) or even idle up on aircon. These have been designed for the job, can't go wrong. Just gotta figure out how to drive them. |
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__________________
Happiness is seeing the race ....... in your rear view mirror
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3 Nov 2004, 10:06 (Ref:1143680)
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#4 | ||
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Racer
Join Date: Nov 2003
Posts: 173
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Steve Broughton from SBD has already done this on his OMS sprint car , but has taken it to the automatic stage so all upshift and downshifts are automatic inc throttle blips on the down change. IIRC he has used a pneumatic system for the gearchange.
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3 Nov 2004, 11:06 (Ref:1143712)
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#5 | ||
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Racer
Join Date: Jan 2004
Posts: 393
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Talk to proshift.co.uk as they have already done this.
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3 Nov 2004, 11:11 (Ref:1143716)
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#6 | ||
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Racer
Join Date: Nov 2003
Posts: 173
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Ive seen the proshift installation of the gearchange actuator ,but how does it blip the throttle on the downshift?
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3 Nov 2004, 21:59 (Ref:1144281)
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#7 | ||
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Racer
Join Date: May 2003
Posts: 286
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What kind of gearbox is this for? and is it a car or bike?
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4 Nov 2004, 12:17 (Ref:1144672)
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#8 | |||
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Racer
Join Date: Jan 2004
Posts: 393
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Quote:
Developed for bike engines. |
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