P ?
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| posted on 20/1/09 at 07:15 PM |
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Best diff for hayabusa in a se7en ?
Hi all,
just wanting to hear thoughts on which is best diff, combined with a hayabusa on a se7en ?
pro's and cons ?
ppl's 0-60's and topends if known, any input please 
Mark
[Edited on 20/1/09 by P ?]
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bob tatt
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| posted on 20/1/09 at 07:20 PM |
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im using a 3.14 in mine hopefull top end of about 135 was using a 3.62 but that ran of revs acouple of times on the longer straights dont think it
will make much difference to 60 times either as you can hold the gear longer thus less changes, just me tupence worth.
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Steve Hignett
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| posted on 20/1/09 at 08:58 PM |
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Freelander, which are 3.21 ratio and 7 kilos lighter than sierra.
But, it's an open diff as standard...
ATB
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Wadders
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| posted on 20/1/09 at 08:59 PM |
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Not running a busa, but my 1/4 mile and 0-60 times dropped when i changed from 3.62 to 3.14.
Al.
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motorcycle_mayhem
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| posted on 20/1/09 at 09:02 PM |
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That's not the question, the question is, 'what diff is best for my useage'.
If you're on 21 inch slicks, you'll need a 3.1-3.2 (Freeloader?). Go to say 205/60-13 radials (e.g A048) on the road and you can start
going Sierra 3.36. If you're not serious about anything and fitting some huge rims for 'cruising' then just about anything will
do.
I've used 13" wheels, sensible tyres, road and track, with both Freeloader and Sierra diffs, they're great. Freeloader is smaller,
getting it's nose down the tunnel might be easier in whatever you have. Quaife ATB (and diff) available off the shelf. earlier Freeloaders had
bearing issues, I've heard, but not experienced any. Sierra viscous LSD was a very sweet unit on my 7. I've seen a picture of a Subaru
diff in the tunnel (a compact long-nose item), but haven't used one. They come in some good ratios.
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nick205
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| posted on 20/1/09 at 09:04 PM |
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Wadders 
That avatar gets me every damned time - mesmerising...!
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Hellfire
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| posted on 20/1/09 at 09:36 PM |
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Looking at it logically, the Sierra 3.14 diffs are as rare as rocking horse shit, and you could be looking for one for years without any joy. The
Freelander ratio is 3.21 but will need modifications to the chassis mounts, propshaft and driveshafts.
The Sierra 3.38 diff is quite common and easy to get hold of, needs no modification to fit the chassis and will give good overall performance and
therefore gets my vote for the best value for money diff for a Busa engined seven.
None of the above are available as LSD units as standard but some say the Sierra viscous LSD is too harsh anyway and not really suitable for a
lightweight seven but thats a whole different topic.
You can fit whatever wheel/tyre combination you want to suit your application and gearing.
Phil
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fesycresy
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| posted on 20/1/09 at 09:39 PM |
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3.38 in my opinion.
But you may struggle with the real long straights.
I think the gear calc. showed 128mph for the 3.38.
If you want top end then it's a 3.14 or a 3.1 from KAM diffs.
-----------------------------------------------------------------------------------------------------
The sooner you fall behind, the more time you'll have to catch up.
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Hellfire
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| posted on 20/1/09 at 09:45 PM |
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Yep, a Busa with a 3.38 diff will top out about 128mph with either 195x50x15's, or 205x60x13's
0-60mph will take about 4 seconds.
Phil
Just by way of comparison, the same setup with a 3.14 diff will give you a theoretical top speed of about 137mph but in reality, you'll really
struggle to achieve this speed with the 'brick like' aerodynamics of the seven and your 0-60 time will take slightly longer.
[Edited on 20-1-09 by Hellfire]
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P ?
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| posted on 20/1/09 at 10:14 PM |
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3.38 it is !!!
cheers for all your input
so anyone gotta 3.38 for sale then  hehe.....
If anyone does know of anybody thats got one knocking around good money awaits
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bob tatt
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| posted on 21/1/09 at 06:40 AM |
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ive got a 7.5 inch one butit needs some mods to fit, i know mnr have loads in stock there bringing them in from europe now give them a bell they are
very helpfull lads indeed.
rob
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