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]

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

the donut on the main roads a bit rum

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

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

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

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

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.

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

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

---

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.

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.

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.

---

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]

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.

---

This is what I have fitted to my car

On the BMW one, there are arrows moulded in the rubber, these must point to the mounting, not the bolt head. Apparently.

flatshifter if set up properly you wont even know its changed gear!!!!

quote:

---

Originally posted by turbo911
flatshifter if set up properly you wont even know its changed gear!!!!

---

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.

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 !!!!

quote:

---

Originally posted by maccmike
the donut on the main roads a bit rum

---

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.

Does this BMW doughnut replace the sprocket adapter or does it bolt to it.

Brad.

quote:

---

Originally posted by roadrunner
Does this BMW doughnut replace the sprocket adapter or does it bolt to it.

Brad.

---

Thanks Jossey.

Mk told me that there is no way to ever completely get rid of the gear clunk, its just the nature of the beast.

Don't you have to shorten the propshaft to make the bmw adaptor fit anyway though? In which case it makes sense just to go for a TRT propshaft?