tks
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| posted on 27/11/07 at 02:54 PM |
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Air shifter / Electronic shifter AND SVA: TESTED ON CIRCUIT!
I'm in the build process of building an airshifter on my BEC.
because of the fact that my car isn't svaed.
i thought that the system somehow should be of a good quality one.
firstly i thought to use the tank of a extigquiser they are all rated to approx 15Bar wich would give me plenty of shifts.
but then i thought that the sva man maybe cannot like that type of bottle.
sow anyone knows of a more better sva friendly compress. air bottle with some kind of BS rating / E approval?
tks
[Edited on 27/11/07 by tks]
[Edited on 15/12/07 by tks]
The above comments are always meant to be from the above persons perspective.
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gingerprince
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| posted on 27/11/07 at 03:58 PM |
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Why would you choose air-shifter over electronic shifter? Surely an air-shifter's use is restricted to the drag strip where a limited number of
gear changes is required?
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tks
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| posted on 27/11/07 at 04:23 PM |
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i'm 100% with you, basicly the problem is that i cant find a suitable solenoid for makeing a electronic shifter.
a pneumatic one is easyer to build + one can add a small 12volt compressor to topup the air tank.
The above comments are always meant to be from the above persons perspective.
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tegwin
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| posted on 27/11/07 at 04:26 PM |
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Have you also considered the HUGE disadvantage with regards to the weight of the air storage tank and compressor? (IMHO you would need quite a large
compressor to keep enough pressure in a small vessel to make it useable)
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matt_claydon
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| posted on 27/11/07 at 04:52 PM |
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Presumably you've seen:
http://www.kliktronic.co.uk/home.htm
(Not cheap)
and
http://personal.riverusers.com/~lneff/electricshift.htm
(looks a lot more locost but no price info on the site)
Surely the solenoids these guys use must be available somewhere? Maybe http://rswww.com ?
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Ricks-9r
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| posted on 27/11/07 at 05:01 PM |
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Home made electric gear shift
http://biketransplant.tripod.com/parts.htm
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tks
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| posted on 27/11/07 at 05:36 PM |
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yeah quite of them i have seem some times. Doupt i am with in is normally if you reverse the current flow through them they should also make the
movement in inverse direction dont you think sow??
Tks
The above comments are always meant to be from the above persons perspective.
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Ricks-9r
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| posted on 27/11/07 at 05:38 PM |
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i think they both pull ,one for up shift & other for the down shift
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tks
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| posted on 27/11/07 at 06:34 PM |
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quote:
Originally posted by Ricks-9r
i think they both pull ,one for up shift & other for the down shift
yeah thats true, but i wanted to use 1 wich could pull and could push.
like the clicktronic can... one way to do that is in my thoughts to change direction of the flow of electrons and to let the piston be in the middle
of its stroke.
The above comments are always meant to be from the above persons perspective.
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tks
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| posted on 27/11/07 at 11:19 PM |
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well guys i changed mind!
now i'm going to use a electric motor and a small toothed belt en 2 sprockets...
it will be more foolprove then everything else i guess.
opinions?
Tks
The above comments are always meant to be from the above persons perspective.
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tks
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| posted on 29/11/07 at 01:36 PM |
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today i decides that i will be using the air shifter setup. mainly i decided to this because its the best way to actuate the lever. the only bottle
neck i has whas having a compressed air bottle installed in the car.
This thing i have thought about some days and i came to the conclusion that there is no danger because i use a dive bottle.
Those bottles are tested and come with a certificate.
Its not probitted driveing around with suchs a bottle in the EU
I only gone a use it until 10bar ants its tested until 350bar
tks
The above comments are always meant to be from the above persons perspective.
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robby
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| posted on 29/11/07 at 07:59 PM |
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i made my own air shifter, used a wee halon extinguisher, painted it grey with black and white quarters on the shoulder, sva no probs. use a 12v
compressor from halfords, wired through a switch from lorry air brakes that turns it on when the pressure drops, the compressor cuts off itself when
full. have run it all year, 3000 miles no hassles. been asked by a few guys to put photos on, will try again this weekend!
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tks
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| posted on 29/11/07 at 08:22 PM |
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the extinquiser was also my idea.
but i thought that a pro bottle would be of a better choice.
Where did you pas SVA with such install?
the bottle was grey + the black and white thinky was it for any reason??
i deff will go with the air shifter now!
post those pics!
Tks
The above comments are always meant to be from the above persons perspective.
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robby
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| posted on 30/11/07 at 02:19 PM |
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passed sva in aberdeen, painted the bottle myself, colour for compressed air here. wiil try and get photos!
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tks
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| posted on 6/12/07 at 04:13 PM |
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thanxs mate
will do my best to reach the same result!
tks
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tks
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| posted on 8/12/07 at 01:17 AM |
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mmhh can anyone digg up the exact rules for the painting sheme... i´m on it right now...
Tks
The above comments are always meant to be from the above persons perspective.
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robby
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| posted on 13/12/07 at 04:46 PM |
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sorry for delay with pics, on the camera now, should get them up this weekend... you'll see cylinder on them to get an idea for paint.
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tks
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| posted on 13/12/07 at 06:06 PM |
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no problem,
how much bar do you put on the piston??
and on the cylinder? my cilinder is CE marked and 23Bar marked.
i have brought an pressure switch to do the compressor switching, i do have brought the same compressor as you.
(its black and has a portable pressure measure device for tyres)
regards,
Tks
The above comments are always meant to be from the above persons perspective.
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robby
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| posted on 15/12/07 at 01:27 PM |
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photos at last! you have no idea how long that just took me... then when i look at them, they're huge! ( and sorry about the quality, was
rushing with no light.) also, can you change the bit where it says 006jpeg etc? bear in mind i've only just noticed you can move a window by
putting the cursor on the blue bar at the top...
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tks
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| posted on 15/12/07 at 09:22 PM |
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well today i was on te circuit of zandvoort for the final trackday of this year.
i coudn't make it to drive on the circuit because allot of work needed to be done
before being able to use te car.
also because of the last 2 heats being closed (for buying in) (because of an nasty accident involving an trauma chopper
Facts:
the pneumatic system worked a treat!
shifting gears is very very easy!
the piston does its job extremely fast!
i used in combination with my injector cutoff/gear button system
only finding neutral is a thing wich needs to be implemented into the board.
(my bike only has a neutral switch)
wat does surprise me is the amount of air suchs a small piston uses!
my air bottle is pressurised until 12bars.
and my regs says 3,5/4bars for the piston.
in theory this should give me 100s of shifts i know the systems leaks somewere. i use a reg/water filter to be able to multiply the usement of one
bottle.
the piston is 50mm stroker by 20mm diameter. its bi stable with brake.
the valve is a DC12volt coiled 5/3 valve. wich in normal pos depressurises the piston. (the lever is the boss while non shifting) i used 6mm hose from
the valve and 8mm for the rest.
i choose to break the injection because this is simpeler (less involved) then breaking the spark (also bad for the cat)
my upshift sequince was:
(i use tps sensor for throttle info, no clutch info available)
if throttle = min Then
Fuel = On - supose clutch is pressed/used -
else
Fuel = Off
end if
SolenoidShiftp = On (piston air is added)
delay = 350 (mili seconds)
Fuel = On (takes 1000 nano seconds)
delay = 5 (mili seconds)
SolenoidShiftp = Off (piston air is removed / moves by force of lever to its normal pos)
any tips of how i coud find neutral??
i found neutral by very fast bliping upwards.
i know the coil has an reaction time of 10miliseconds approx (relais do)
how low could i go with the delay for the piston/air?? (the 350)
Tks
(if any one is interested i could makeup simple list of needings for this mod)
The above comments are always meant to be from the above persons perspective.
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robby
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| posted on 16/12/07 at 09:26 PM |
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ha ha! you know more about it than i do! i go for quick clicks for neutral too - gonna change that soon. glad to hear it works for you!
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tks
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| posted on 9/1/08 at 04:58 PM |
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mhh i will need some sort of extra button to find neutral.
did the tester drive your car?? did he find neutral??
Tks
The above comments are always meant to be from the above persons perspective.
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Jon Ison
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| posted on 9/1/08 at 07:29 PM |
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Just a few words of caution, air shifters, klictronic and the likes have no mechanical sympathy like the hand does.
I know its rare and maybe once in every 3-4K miles but sooner or later for whatever reason the gearbox would rather you didnt shift, your hand feels
this and stops, a mechanical shifter don't and the gear is going in whatever the resistance.
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tks
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| posted on 9/1/08 at 07:36 PM |
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quote:
Originally posted by Jon Ison
Just a few words of caution, air shifters, klictronic and the likes have no mechanical sympathy like the hand does.
I know its rare and maybe once in every 3-4K miles but sooner or later for whatever reason the gearbox would rather you didnt shift, your hand feels
this and stops, a mechanical shifter don't and the gear is going in whatever the resistance.
I'm not with you.
The maximum pressure you give the piston is limited. sow its force is to.
also i think that with allot of sympthy puling on a stick is far worser then a air pressured piston with a lever of 40mm.
i'm quite sure quite some bec gearboxes go because their owners had a bad choice in ever lenghts appling more power then they know etc. etc.
Tks
The above comments are always meant to be from the above persons perspective.
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Jon Ison
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| posted on 10/1/08 at 08:24 AM |
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Was just a word of caution that's all.....
Any mechanical device will continue to exert whatever force it is set to exert whatever if any the resistance it gets.
The hand can feel this and the brain says "hang on a minute, better not crunch that one in"
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