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Danny
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PostPosted: Wed Aug 26, 2009 8:38 pm 
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sgc wrote:
Fat Boy Dave wrote:
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If I had a spare $3500, I know where I'd be spending it


Would that be on a 5 speed box or on an elder 7 port head?


AAaaiiieeeeeeeeee

If I had a spare $7000, I know where I'd be spending it.


If you find $14,000, let me know :wink: :lol:

MG Rocket wrote:
you mean....... i'll still be doing THAT in the years to come???


You and me both :(

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sgc
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PostPosted: Wed Aug 26, 2009 9:55 pm 
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Chow wrote:
If you find $14,000, let me know :wink: :lol:


Make that $21,000.. I've got two habits to satisfy.. :cry:

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Daren W
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PostPosted: Thu Aug 27, 2009 4:19 pm 
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Hi can you still get Jack Knight 6 speed sequential shift boxes ? Daren
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sgc
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PostPosted: Thu Aug 27, 2009 7:59 pm 
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Last I heard Jack Knight Developments was in financial trouble, not shipping paid-for orders..

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simon k
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PostPosted: Fri Aug 28, 2009 10:45 am 
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MG Rocket wrote:
simon k wrote:

if I had a dollar for every time I got on the freeway and reached for a 5th gear, I could afford one of those boxes.... :roll:


I'm a newbie to the mini world and you're an old timer in the mini world....
you mean....... i'll still be doing THAT in the years to come???


yep.... :roll: :lol:

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deg
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PostPosted: Mon Aug 31, 2009 10:17 pm 
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so does anyone know who can match the box to the gear set
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Lillee
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PostPosted: Tue Sep 01, 2009 11:39 am 
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Just wanted to chime in here: are you wanting a 5spd because of the freeway? or because of the close ratios? You may want to research the drive ratios for each gear in those boxes and compare them to 4spd because some of them are purely made for racing and have gear ratios spread over the same or similar to a 4spd box (ie, same ratios but spread over 5 instead of 4 gears). From memory the 5th gear in some of them is 1:1 just like a 4spd.. you might want to check that out.

If the need is for a taller top gear then maybe a change in diff ratio is what you want and it probably 5 or 6 times more economical than a 5spd box. Perhaps the answer is a change in both??

All I know is when I was looking into these years ago for my build, I was content with a 4spd cooper S ratio box. Admitedly I don't do any sort of freeway miles to comment but I hardly ever find the need to go into 5th on the freeway, it has something to do with how much power your donk makes. in 4th, Lillee eats up the revs and wants to go well out to 5000rpm no problems, at which (on a 3.44 diff) you'll be breaking the law :shock: (4400 is 110km/h).

All I am saying is have a dig around before you go and blow perfectly good Sic Bo money on a gearbox that doesn't solve your problem

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sgc
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PostPosted: Tue Sep 01, 2009 11:48 am 
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Lillee wrote:
(on a 3.44 diff) you'll be breaking the law :shock: (4400 is 110km/h).


Picking nits here, but 110km/h on a 3.647 diff is 4380rpm, a 3.444 diff gives 4140rpm.

[edit] I put this spreadsheet together to calculate RPM/road speeds :)

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Super-mini
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PostPosted: Tue Sep 01, 2009 1:09 pm 
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the helical 5 speed boxes minispares sell have an overdrive 5th gear.
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drmini in aust
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PostPosted: Tue Sep 01, 2009 5:00 pm 
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Super-mini wrote:
the helical 5 speed boxes minispares sell have an overdrive 5th gear.

And they come with a disclaimer- no more than 90lb/ft torque or you will munch it.
No good to me then... :lol:

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Last edited by drmini in aust on Tue Sep 01, 2009 7:02 pm, edited 1 time in total.

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benjamin
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PostPosted: Tue Sep 01, 2009 6:45 pm 
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drmini in aust wrote:
Super-mini wrote:
the helical 5 speed boxes minispares sell have an overdrive 5th gear.

And they come with a disclaimer- no more than 90lb/ft torque ot you will munch it.
No good to me then... :lol:


can i use?

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drmini in aust
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PostPosted: Tue Sep 01, 2009 7:02 pm 
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benjamin wrote:
drmini in aust wrote:
Super-mini wrote:
the helical 5 speed boxes minispares sell have an overdrive 5th gear.

And they come with a disclaimer- no more than 90lb/ft torque or you will munch it.
No good to me then... :lol:


can i use?

Sure, if the turbo has zero boost... :lol:

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slinkey inc
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PostPosted: Tue Sep 01, 2009 8:51 pm 
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I was thinking recently that when I finally get that lotto ticket. I'd get the KAD 5 speed 'box which has a 1:1 5th gear, but use a 2.76:1 final drive. So I did have the a bit lower top gear revs but an extra gear to shift through on the way up.

Currently, i'm always reaching for 5th in my red mini. Buckets of mid-range torque means 3000rpm shifts are the norm, even feels that way at 80kph in 4th. It could be very easy to break the law in 80 to 100kph overtakes (I live out of town and do mostly 100kph driving) so maybe just a longer diff?

Having said all that, my current Mini project has a 5 speed 'box and more power anyways, maybe just finish that...

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simon k
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PostPosted: Tue Sep 01, 2009 9:24 pm 
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slinkey inc wrote:
I was thinking recently that when I finally get that lotto ticket. I'd get the KAD 5 speed 'box which has a 1:1 5th gear, but use a 2.76:1 final drive. So I did have the a bit lower top gear revs but an extra gear to shift through on the way up.


yeah, but your 1st gear ratio stays the same, so the diff makes it slow off the line

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Lillee
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PostPosted: Wed Sep 02, 2009 9:22 am 
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sgc wrote:
Lillee wrote:
(on a 3.44 diff) you'll be breaking the law :shock: (4400 is 110km/h).


Picking nits here, but 110km/h on a 3.647 diff is 4380rpm, a 3.444 diff gives 4140rpm.

[edit] I put this spreadsheet together to calculate RPM/road speeds :)


Yeah you know what I meant... anyway weak top gear, slow bottom gear if changed diff ratio, all these need to be considered before putting money down

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