bobinspain
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| posted on 18/12/12 at 02:56 PM |
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Cush drive to quieten BEC gear change.
Smart car bike engine kit car eats Lamborghini Ferrari for breakfast 
Yet again, 'daft question time' from a novice.
The gents in the link above use a propshaft coupling from a BMW to soften the gearchange and cut down on the 'lash' associated with a BEC
gearchange.
I have the standard MK factory-supplied prop.
I understand from previous posts that the TRT (torque-resilient-tube) prop can do the trick and quieten gear changes. (MK said they'd tried it,
without significant improvement).
Has anyone got any experience of using the above solution on an MK? (I've asked MK directly for their opinion via email).
Just a thought.
Item 7. in the ad' refers to the "crush drive" (sic). The BMW couplling can be supplied for £120.
[Edited on 18/12/12 by bobinspain]
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tilly819
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| posted on 18/12/12 at 03:12 PM |
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carnt answer your question but am i the only one who read that link as a comprenhensive guide to putting a busa into a smart car?
Tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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maccmike
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| posted on 18/12/12 at 03:46 PM |
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the donut on the main roads a bit rum
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afj
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| posted on 18/12/12 at 04:01 PM |
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mine has got a trt prop from bailey morris and it bangs and ive been in cars with a sierra prop cut and shortened and they bang if i were building
again id try a donut from a sierra or bmw
eerrrrrrrrrrrrrrrr
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renetom
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| posted on 18/12/12 at 04:49 PM |
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prop
Hi
We have an MK with a R1 engine, a MNR reverse box with the rear
Prop having TRT .
Its still a clunky gear change
Doughnut may help ????, I would check with a prop manufacturer first. (Spicer's)
Everyone say's their clunky so I would guess its inherant
Good luck
René
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Hellfire
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| posted on 18/12/12 at 05:17 PM |
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We have a TRT prop fitted on our MK. It takes the 'ding' (technical term)  out of the gear change but doesn't remove the
clunkiness altogether. IMHO, it's the closest you'll get to replicating the cush drive on the rear sprocket of a motorbike. The TRT prop
will therefore be more mechanically sympathetic on the gearbox than a solid prop and should help prolong the life of the gearbox.
Phil
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watsonpj
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| posted on 18/12/12 at 05:52 PM |
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I have a fury with a fireblade and reverse box which I originally had no TRT in and it rattled and banged alot. I then got a TRT to improve things and
would say it certainly has improvement things but still sounds like a bag of old spanners at times especially when running at constant speeds.
Pete
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franky
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| posted on 18/12/12 at 06:09 PM |
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You've hit on a good point, all bikes have a rubber 'cush drive' built into the hub. A rubber one from a e36 might be a very good
idea, it'll lower impact to the gearbox for sure.
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Nigel fury
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| posted on 18/12/12 at 06:46 PM |
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I have both the TRT and one of these ( http://www.novaracing.co.uk/reversing-gearbox.htm) seems to work well I am also totally clutches once moving
up and down except at slower speeds when I use the clutch - years and 1/2 million miles on a bike gives me a good feel to make most changes smooth.
No banging etc in normal driving front my gen 2 Hyabusa, taking it up to 1550cc next month and about 220bhp at the wheels and 163 ft lb - should go
well in a fury
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jeffw
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| posted on 18/12/12 at 08:48 PM |
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quote:
Originally posted by Nigel fury
I have both the TRT and one of these ( http://www.novaracing.co.uk/reversing-gearbox.htm) seems to work well I am also totally clutches once moving
up and down except at slower speeds when I use the clutch - years and 1/2 million miles on a bike gives me a good feel to make most changes smooth.
No banging etc in normal driving front my gen 2 Hyabusa, taking it up to 1550cc next month and about 220bhp at the wheels and 163 ft lb - should go
well in a fury
Certainly should  Looking forward to more details on this.
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Stella
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| posted on 19/12/12 at 07:34 AM |
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Funny I have just pulled the reverse gearbox and props out of my blade powered Fury, Bailey Morris are just making a replacement prop to replace the
setup, and they suggested the Resiliant tube which I have gone for, interested to see if it makes any difference.
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renetom
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| posted on 19/12/12 at 10:25 AM |
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prop
Hi again
Just another thought
The BMW doughnut has 6 hole fixing
Has your prop & output ???.
There's some on ebay starting at £11 to ?
certainly not £120.
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bobinspain
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| posted on 19/12/12 at 11:17 AM |
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quote:
Originally posted by renetom
Hi again
Just another thought
The BMW doughnut has 6 hole fixing
Has your prop & output ???.
There's some on ebay starting at £11 to ?
certainly not £120.
Not sure, but to check compatibility before I start spending (more) money, I've asked Danny at MK. Awaiting a reply.
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wylliezx9r
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| posted on 19/12/12 at 11:51 AM |
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Bob, it'll never be like a car engined gearbox. Even on a bike where the output is via chain drive they are clunky, I don't know if it
would be a great idea having a trt prop and a doughnut as you will be introducing more slack into the output of the engine, I may be wrong though.
[Edited on 19/12/12 by wylliezx9r]
I spent a lot of money on booze, birds and fast cars. The rest I just squandered.
George Best
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40inches
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| posted on 19/12/12 at 01:03 PM |
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quote:
Originally posted by renetom
Hi again
Just another thought
The BMW doughnut has 6 hole fixing
Has your prop & output ???.
There's some on ebay starting at £11 to ?
certainly not £120.
They fit the same as Ford ones, 3 bolts on each flange, also a cup that fits around the outside to stop flex.
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Nigel fury
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| posted on 19/12/12 at 01:34 PM |
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This is what I have fitted to my car
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40inches
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| posted on 19/12/12 at 03:54 PM |
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On the BMW one, there are arrows moulded in the rubber, these must point to the mounting, not the bolt head. Apparently.
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turbo911
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| posted on 19/12/12 at 09:11 PM |
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flatshifter if set up properly you wont even know its changed gear!!!!
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bobinspain
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| posted on 20/12/12 at 09:06 AM |
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quote:
Originally posted by turbo911
flatshifter if set up properly you wont even know its changed gear!!!!
I have a Flatshifter 'Expert' fitted. On a mission and giving it beans, the upshifts are indeed seamless. At low speed/revs, I use
clutched shifts, which I understood to be the correct procedure.
If you and others successfully use F/S at low speeds, I'll give it a go.
What's the consensus?
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Davegtst
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| posted on 20/12/12 at 09:39 AM |
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I find on mine that once i get going i only need to move the clutch pedal a small amount rather than pushing it all the way in. If i shift like this
it's so much smoother.
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turbo911
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| posted on 20/12/12 at 02:33 PM |
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hi when i change up just driving at normal speeds i dont use the clutch i just lift off the gas, just like riding a bike if you were blindfolded and
earpluged you wouldn't know it had gone all the way up the box into 6 th gear i also have a rtr prop but only because my diff is solid mounted
!!!!
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ReMan
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| posted on 20/12/12 at 04:29 PM |
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quote:
Originally posted by maccmike
the donut on the main roads a bit rum
"Rum"
www.plusnine.co.uk
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Custardpants
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| posted on 29/12/12 at 10:28 PM |
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I reckon it'll always be a bit clunky bob - my car is slightly clunky when being driven slowly but perfectly smooth when making progress, and
I'd rather have it that way round too.
Found gear changes smoothed out a great deal even around town if the throttle is briefly squeezed to load the drive train up before lifting off and
proceeding with gear change.
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roadrunner
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| posted on 2/1/13 at 03:46 PM |
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Does this BMW doughnut replace the sprocket adapter or does it bolt to it.
Brad.
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jossey
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| posted on 2/1/13 at 06:38 PM |
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quote:
Originally posted by roadrunner
Does this BMW doughnut replace the sprocket adapter or does it bolt to it.
Brad.
Bolts to it.
Thanks
David Johnson
Building my tiger avon slowly but surely.
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