z3mjason
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| posted on 27/7/11 at 04:04 AM |
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Hayabusa + 3.62 Diff Gear speeds?
Good morning All,
I have looked at the gear speed calculator but I am afraid I just dont get how to use it! Duh...
Am in the process of having my Fireblade engine replaced with a 1999 Hayabusa engine, should be ready in 2 weeks 
Can anyone tell me what my in gear speeds will be if running my current 3.62 diff? I have read various things about Freelander diffs being better
suited to the Hayabusa engine but frankly am unsure of what that change would mean to in gear speeds!
Any help greatly appreciated....
Many thanks
Jason
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BobM
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| posted on 27/7/11 at 04:56 AM |
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quote:
Originally posted by z3mjasonCan anyone tell me what my in gear speeds will be if running my current 3.62 diff? I have read various
things about Freelander diffs being better suited to the Hayabusa engine but frankly am unsure of what that change would mean to in gear speeds!
My Fury felt pretty under geared when I had a 3.62 in it for a while  It was even pretty bad with a 3.36 in.
Here's what my spreadsheet says (all at 10750rpm):
1st - 48
2nd - 65
3rd - 82
4th - 98
5th - 110
6th - 120
Not very Locost but very BEC
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z3mjason
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| posted on 27/7/11 at 08:58 AM |
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Bob,
Thanks very much indeed for that information. It sounds like I may need to find a slightly longer diff then!
Obvious question, does anyone have a 3.36 diff they may sell or swap for a 3.62??
I am not to stressed about top speed but guess a 3.36 or whatever the next step down/up is?
Cheers for help!
Jason
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Bigboystoys
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| posted on 27/7/11 at 09:06 AM |
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A 3.09 is available for the ford diggs, these work well with busa engine and makes it much better on the motorways. I'm running a 3.44 with my
gsxr 1000 engine which is not perfect but ok for now.
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z3mjason
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| posted on 27/7/11 at 09:26 AM |
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Okay so it sounds like a 3.36 is the very least I need to go to. My car will only see fast road and occasional track use so not to concerned with
motorway cruising ability. Guess its a compromise without sapping to much of the acceleration away in favour of lazy high speed cruising.
Further investigation/searching for diffs needed then!!
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Bigboystoys
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| posted on 27/7/11 at 09:34 AM |
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Ti be honest I found that although I dropped from a 3.89 to a 3.44 I didn't loose much acceleration as the gearing with the 3.44 gives much
longer gears meaning you can make the most of the fact that bike engines love to rev.
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BobM
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| posted on 27/7/11 at 10:16 AM |
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You won't notice a drop in acceleration as it's such a close ration box, the only exception being getting away in first gear but even with
my 3.14 I was still fairly spritely off the line.
A 3.36 should give you about 129 in top. I have a spare 3.36 with LSD, someone else said they wanted it but haven't heard back from them.
Not very Locost but very BEC
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Nick DV
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| posted on 27/7/11 at 12:17 PM |
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You could even go 3:14 if you can find one. Try Classic Conversions.
Cheers, Nick
"The force will be with you, always!"
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z3mjason
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| posted on 27/7/11 at 12:55 PM |
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Thanks all!
Bob, you have a mail...
Nick, I will try them thank you
For clarity my diff is a 3.62 Sierra diff, I take it these things are swap in swap out with the same mountings etc?
[Edited on 27/7/11 by z3mjason]
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Minicooper
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| posted on 27/7/11 at 01:51 PM |
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What size are your wheels and tyres and what is your required top speed, I would work out what you need and not guess a 3.14 is the most expensive and
differcult sierra diff to get hold off
Cheers
David
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Chet
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| posted on 27/7/11 at 03:19 PM |
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FYI-
I noted you're using a 1999 Hayabusa engine.
I strongly suggest you update the starting system to the factory 03 or later.
The pre 03 starting system will break the starter and possibly the cases if you spin the car.
Chet
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z3mjason
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| posted on 27/7/11 at 06:52 PM |
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David,
I am running 195/50/15's on 15 TD's. Top speed would be 130 - 140 to allow for occasional comfortable 80mph ish cruising.
Chet,
Yes I am aware of this "issue" will look to upgrade it before any trackdays. Any idea of cost for this mod?
Cheers this has been very helpful people! Thank you
Jason
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Minicooper
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| posted on 27/7/11 at 09:40 PM |
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Putting those figures into the bike ratios.xls spreadsheet, assuming a 11000 redline which needs to be confirmed, gives
3.64 120mph
3.38 130mph
3.14 140mph
Worth getting a second view on the calculations to confirm them
Cheers
David
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z3mjason
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| posted on 28/7/11 at 05:16 AM |
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David,
Thats brilliant thank you. Looks like its a 3.36/8 then or the gold dust 3.14. I'll probably get the 3.36 first and see. Thinking that my Toyo
T1's might be the first change for something more sticky....
Cheers
Jason
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Minicooper
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| posted on 28/7/11 at 09:00 AM |
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3.36 is a 7.5" granada style diff
3.38 is a 7" Sierra diff
You need to look at what's in your car now and buy the appropiate diff, so it's a straight forward swap out
Cheers
David
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z3mjason
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| posted on 28/7/11 at 05:52 PM |
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David, great stuff thank you! On the hunt for a sierra diff with 3.36 then....
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JohnCL
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| posted on 2/8/11 at 12:41 PM |
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Anyone know what the ratio is for a Freelander diff and what speeds that gives on 13 inch wheels for a 1999 standard Hyabusa
Ta
John
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BobM
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| posted on 2/8/11 at 02:37 PM |
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I'm pretty sure a Freelander is 3.21
Not very Locost but very BEC
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