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Hayabusa Gearbox?


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#1 Attack2001

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Posted 10 August 2008 - 01:44 PM

I've seen in a lot of places, where people put standard haybusa engines in there cars and they always say it can olny do about 115-120mph? Is this the case or can it go faster? And if it is the case how do you raise the top speed? I take it changing the gearkit...? Thanks, Thomas.......

#2 gizmo

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Posted 10 August 2008 - 03:48 PM

you change sprocket size, go from a 45 tooth to a 41 tooth, or a 14 tooth primary to a 17 tooth. for example. also tire/ wheel diameter changes your speed.

#3 Attack2001

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Posted 25 September 2008 - 04:36 PM

What if your using a transfer box - http://www.quaife.co...ar-drive-system - and not a chain and sprocket how would you do it then?

#4 R1mini

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Posted 25 September 2008 - 04:57 PM

What if your using a transfer box - http://www.quaife.co...ar-drive-system - and not a chain and sprocket how would you do it then?


That particular box has a quick change facility so you can change the gearing or as gizmo says change the tyre/wheels

Cheers
David

#5 z cars chris

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Posted 25 September 2008 - 07:49 PM

the problems you refer to are normally found in lotus seven style cars which use a sierra diff or similar this limits you to a 3.64 diff ratio in the more readily available ratios off the shelf
add to that a rolling circumference of a typical 13" wheel and tyre or low profile 15" wheel and tyre and you will get 120 mph
our cars use chains and sprockets which allow the gearing to be quickly altered to suit all conditions we even use split rear sprockets to facilitate quicker changes
the hayabusa monte carlo turbo will do 150 mph in top
my race car is geared to 130 mph and a typical road car 125 mph
theres a balance to be reached between ultimate top speed and accelaration
the quaife drive box is a bit of a pain for two reasons the first being it has much bigger power losses than a chain and sprocket so for racing you are giving away power to the next guy
in the radicals this doesnt matter because they all run to the same rule book and so its an even playing field
the other problem is that the axle centre line to sprocket centre line is a long way from memory around 18 inches
a chain and sprocket set up like in our minis is typically around 12 inches
this is the only way you can get the bike engine into the available space at the rear of a mini
if you were putting it into a longer car then the quaife unit would be fine
chris

#6 alowry

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Posted 26 September 2008 - 02:39 PM

Changing the subject slightly, but has anyone tested acceleration for a zcars mini with the various engine & gearing configurations?
How quickly can a steel bodied R1 or hayabusa accelerate if its geared to 125mph?
It would be also be interesting to know what weight people are achieving with their various builds even just to know whats possible.

#7 z cars chris

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Posted 30 September 2008 - 04:46 PM

weight wise they all vary but as a rough guide a steel bodied hayabusa with carpets bulkhead reverse and tank of fuel water all oils etc ready to drive will weigh around 625 to 650 kilos
my last years racer which was stripped pretty much bare, had ally doors and fibreglass boot lid/ bonnet weighed 550
go for a carbon roof and front end you will see 520 kilos
the new sprint z cars racer weighs exactly 500 kilos ready to race as it was weighed at scrutineering this weekend

0 to 100 mph time in my racer last year from the on board telemetry was 9 seconds weight 550 kilos fat bloke driving !!
this years racer is 8.5 seconds 500 kilos same fat bloke driving
road cars should do 0 to 100 in around 9.5 to 9.75 seconds depending on how clean you get away from rest
if you visit the race reports section on the croft report theres a video showing 3 starts on the weekend one race i get trapped behind a caterham at the start and have to wriggle my way through but the others show how they get up and go against some serious cars
i just need more power now for the race or perhaps lose 4 stones might help
chris

#8 Attack2001

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Posted 26 October 2008 - 04:22 PM

ok then if you can't fit the quaife transfer box in a mini then you definately can't fit it in a 126. The only problem i have with a chain is if your going down the motorway at 100-120mph (maybe :D) and it snaps, and the engines going to be revving at say 10-11,000, the revs go sky-high! you loose power, you get a massive great chain thrown around in your beloved engine compartment and drop on the motorway and then you have to some how get home? and then there's the reverse problem? How much do the diff's used in the ZCars cost then? i suppose it's going to have to be a chain but how does the reverse work on them? Thanks all! Thomas.......




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