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Post by daveisom1 on Dec 18, 2013 14:29:24 GMT
I'm looking at changing my sprockets over the winter period to lower the gearing slightly which will help in pulling away. I fitted a new set of standard ones when I built the trike. Does any one have any thoughts on sizes do I just go 1 tooth down on the engine and 1 up on the wheel or should I lower it even more
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Post by edwinwl on Dec 19, 2013 12:25:01 GMT
Sprocket ratio's vary. Each serie has its own ratio. (Google wil help you finding the standard ratio)
tR1ke has higher mass than Original donor bike. So load on clutch and gearbox is heavier. For my tR1ke I changed standard ratio 16:43 (I believe) into 15:47 It helps taking off, but reduces topspeed, increases RPM's and fuel consumption at highway speeds. Weakest part in the drive train of my tR1ke is the rear tire traction.
Experimenting the ratio is depending on what you want: A sprinter / drag racer versus comfortable touring machine.
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Post by daveisom1 on Dec 19, 2013 15:01:25 GMT
Hi Edwin Thanks for your thoughts. My standard set up is also 16 - 43 and I have ordered a 15 - 44 set to see how that goes. I'm just trying to make pulling away a little easier on the trike. I have fitted a Barnett clutch which has made a difference. Yes I agree back wheel grip is a rather weak point but also good fun to slid a little and with lowering the gearing will be even more slippery. Not to worried about doing mega MPH I find mid range acceleration is by far the best. From your ratio looks like I may have to get an even bigger rear sprocket, bit of experimenting I think.
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Post by slugshot on Dec 19, 2013 21:26:23 GMT
I run 15:46 on the road, this gives just over 6k rpm at 70mph
I changed to 14:50 when I was at blyton for the demo day, not recommended for the road.
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Post by erik on Dec 19, 2013 22:03:08 GMT
tR1ke has higher mass than Original donor bike. So load on clutch and gearbox is heavier. For my tR1ke I changed standard ratio 16:43 (I believe) into 15:47 It helps taking off, but reduces topspeed, increases RPM's and fuel consumption at highway speeds. Weakest part in the drive train of my tR1ke is the rear tire traction. Some may disagree with me but having a spinning rear tire is actually a great clutch and gearbox saver. At first I thought this was a bad thing but it will prevent the engine to be demolished premature in our tR1kes. For this reason I do not think a Barnett clutch is needed because the tire cannot cope with the torque the clutch has been designed for and the load shouldn't be heavier in this kitcar concept. I have been a passenger in a Barnett clutch tR1ke but the clutch was worn out on high load. I think this is because of the high milage of the donor engine to blame for and the Barnett upgrade wasn't needed at all. just some thoughts...
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Post by Deleted on Dec 20, 2013 10:33:18 GMT
I suggest picking Kevin's brain. That man plays around with a multitude of sprockets. He is your man to find out what works best.
For me I left the sprockets standard. For me it's fine. I get 74MPH in first gear and it will cruise all day in 6th at 40MPH
I also tow with it and all is well.
If you want faster acceleration then play around and for sure ask Kevin.
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Post by slugshot on Dec 20, 2013 11:20:41 GMT
For the road Edwin and myself have very similar gearing, I think its a good compromise. I would'nt go any lower as top gear would be to low for m,way cruising.
Nick....Why would you want to go cruising at 40mph And as for towing a trailer...im still waiting to see it in action. Will you do some fast laps around curborough next year with it hooked up:)
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Post by CBR ocket (tonyslee) on Dec 20, 2013 11:59:58 GMT
I'm looking at changing my sprockets over the winter period to lower the gearing slightly which will help in pulling away. I fitted a new set of standard ones when I built the trike. Does any one have any thoughts on sizes do I just go 1 tooth down on the engine and 1 up on the wheel or should I lower it even more Try this website, it may help. www.westgarage.co.uk/calculators/calculators.htmlCheers tony .
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Post by wonderbadger on Dec 20, 2013 15:02:35 GMT
That looks like a very useful site Tony - added to favorites for when I (eventually) get to the stage of needing such things! Thanks Andy
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Post by Deleted on Dec 20, 2013 15:29:27 GMT
Erm. Well no I won't be doing that. I can't be wrecking my caravan to simply amuse you Kevin. Goodness where would I sleep then :-)
As for cruising at 40. I don't always want to be driving everywhere on door handles.
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Post by daveisom1 on Dec 20, 2013 16:23:25 GMT
Thanks for all your replies and thoughts. I think I'm going to start with 15-44 and see how it goes as my existing new chain can then still be used I will then increase the wheel sprocket to lower the gearing if required. Have to say I'm very happy the way the car drives its just trying to make the initial pulling away a little easier.
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Post by edwinwl on Dec 21, 2013 9:34:20 GMT
My advise is to start with front sprocket: 1. it is the cheapest sprocket 2. 16 teeth back to 15 is already 6% gearing increase.
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Post by erik on Dec 21, 2013 16:54:03 GMT
Have to say I'm very happy the way the car drives its just trying to make the initial pulling away a little easier. The clutch pedal leverage might be the problem for this issue. Have a look at Kevin's and mine pedal modification. Pedal pressure on my version is only 5kg or so and leverage travel doubled. It might be worth to have a closer look at the throttle lever pedal travel too. In the stock version the travel is very short. The tR1ke trip I made as a passenger with the Barnett clutch was very difficult to get moving. stalling the engine and rock hard gear changes (I thought the gearbox would get broken teeth in no time) and difficult rpm management which proved for me the stock pedal settings need to be tweaked quite a bit. br, Erik
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Post by daveisom1 on Dec 22, 2013 14:02:51 GMT
I have checked my clutch pedal connection and it is in the standard hole so you are most probably right so will move to a 35mm pivot point and see what difference that will make. My throttle connection is through the chassis tube as that one I calculated to give max pedal movement. Thanks for the helpn and merry Christmas to all.
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Post by erik on Dec 22, 2013 19:34:07 GMT
Yes, these mods me and Kevin made to our pedals too.
Merry christmas!
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