Zoophoria
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| posted on 16/6/04 at 08:36 PM |
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Final gear ratio, Top Speed
Wich final gear ratio would be good for a bec with a blade, r1 or a zx9 engine? I'm planning on using a differential from a donor veichle.
I'm also wondering how fast bec´s go, I dont mean those who got turbos and nitrous etc, etc,.. but the "normal" bec. 
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Hellfire
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| posted on 16/6/04 at 08:40 PM |
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Ours is good for 115'ish mph with a Sierra 3.62 LSD from a 4x4. Engine is a 1995 (pre-cat) 893 Fireblade. I've heard a 3.38 gives more
legs...
[Edited on 16-6-04 by Hellfire]
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Zoophoria
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| posted on 16/6/04 at 09:04 PM |
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Hellfire: Where can I find seats like that?
They look light!
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alister667
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| posted on 16/6/04 at 09:50 PM |
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Pop along to THIS thread and download 'Speedcalc.xls'. Its in the 5th
post down.
It's a spreadsheet that shows you the top speed in various gears of many different bike engines, allowing you to play with different diff, and
(importantly) wheel and tyre sizes.
It's well worth playing with as cruising at 60mph can be a little harsh if you don't get your calcs right!
All the best
Ali
http://members.lycos.co.uk/alister667/
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spunky
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| posted on 16/6/04 at 09:53 PM |
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Gave mine a 'nudge' after failing SVA again yesterday. Moved up to top about 95, but bottled out around 115, still had a few revs left.
3.62 open diff, 14" wheels on 185/60 yokos.
John
The reckless man may not live as long......
But the cautious man does not live at all.....
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JoelP
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| posted on 16/6/04 at 10:20 PM |
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remember you can take the LSD bit from a nonslip diff and add it to any diff if needed. at least, someone said they had done it...
also, diesel or auto sierras have the lowest (highest?) ratios, 3.38 and 3.1something.
all IIRC of course...
Beware! Bourettes is binfectious.
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Zoophoria
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| posted on 17/6/04 at 06:12 AM |
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quote:
Originally posted by JoelP
all IIRC of course...
What is "IIRC"?
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timcrasher
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| posted on 17/6/04 at 06:53 AM |
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My MK ZX9R does 105.2 mph flat out on the rev limiter in top. Spot on for trackdays but crap on the road. Very impressive top gear roll on
acceleration figures though.
I had a problem with my original diff when it was damaged during the reverse box locking up. My neighbour got me out of the sh#t with the one from his
old 1.8 cvh Sierra. It turns out it's a 3.92 and when matched to the low gearing of the ZX9R, it makes it flippin' stupid on
acceleration.
I need to find a 3.38 or lower pronto
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gys
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| posted on 17/6/04 at 07:38 AM |
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quote:
Originally posted by Zoophoria
What is "IIRC"?
If I Recall Correctly
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Zoophoria
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| posted on 17/6/04 at 08:09 AM |
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I can't really decide wich way I should go, either I use a sierra diff and mount it with some sort of a flex coupling directly to the sprocket
of the engine wich I think would be the easiest way or I go for a chaindrive wich will be easy to change the final gear ratio on but harder to build
and more expensive I think, with the lsd in mind.
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PeterGT4
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| posted on 18/6/04 at 04:24 AM |
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quote:
Originally posted by alister667
Pop along to THIS thread and download 'Speedcalc.xls'....
I did, but it doesn't seem to do anything, even when I change the variables at the top of the page. I have XL Viewer, is that the problem?
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Crazy Jay
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| posted on 18/6/04 at 10:37 AM |
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Apparently my diff is from a mk1 sierra which are quite hard to find now, its a 3.14 and to think i found it layin in the corner of a scrapyard. Just
remember the near side hub nut is a left thread! Made tht mistake and fecked up the threads on the shaft, luckily tho i got them recut
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alister667
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| posted on 18/6/04 at 11:08 AM |
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quote:
Originally posted by PeterGT4
quote:
Originally posted by alister667
Pop along to THIS thread and download 'Speedcalc.xls'....
I did, but it doesn't seem to do anything, even when I change the variables at the top of the page. I have XL Viewer, is that the problem?
If possible try to open it in Microsoft Excel itself. Works fine for me in Microsoft Excel 2000. I think I had difficulty getting it working in Open
Office.
http://members.lycos.co.uk/alister667/
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phelpsa
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| posted on 18/6/04 at 03:15 PM |
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The selector doesn't work in open office.
Adam
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Zoophoria
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| posted on 19/6/04 at 12:02 PM |
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A customer at work said he had a BMW differential that I could have if I wanted, its from a 525 I think. I don´t know if it has a lsd. Would that be a
good diff to use? If it has a lsd that is.
[Edited on 19/6/04 by Zoophoria]
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JoelP
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| posted on 19/6/04 at 09:42 PM |
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quote:
Originally posted by Zoophoria
I can't really decide wich way I should go, either I use a sierra diff and mount it with some sort of a flex coupling directly to the sprocket
of the engine wich I think would be the easiest way or I go for a chaindrive wich will be easy to change the final gear ratio on but harder to build
and more expensive I think, with the lsd in mind.
in my opinion, its worth having a go at chain drive cos then you have some experience that will help with any future mad twin engine projects. This is
what i intend to do.
Beware! Bourettes is binfectious.
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