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Home > General Chat > Gearbox ideal spec for hand driving around the bend.

vrooom

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9th Aug, 2006 at 07:27:26pm

i would like to build a gearbox to spec that are okay with hard cornering (well, its mini, and i happen to live in a city of 300+ roundabouts) and i would like to do some track day.

My ideal spec would be std gearbox with SC drop gear, LSD with gentle payload (not hard heavy lb) running on 3.21 FD. to keep the cost down. with CPU pipe.

engibe will be 1293cc with T2 turbo or fiat punto gt turbo. with kent 266 or PH2 camshaft. afterall im not looking for out and out turbo engine.

I am running on 10" with mamba 5.5" wide, it stick out a half a inch out of standard arches.

Would this gearbox be strong enough for booting around the various sized/speed limit on roundabouts.

Or it is really down to suspesion setup? as i dont like to take the engine after couple of thou miles

Scruffy

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Seaford Rise, South Australia

9th Aug, 2006 at 07:38:39pm

You won't be able to use an LSD with a 3.2 as even a 3.7 & 3.44 need machining to fit and 3.444 is the lowest you can go.

Other than that I see no other problems with the spec - the important bit being the COPU and you are using sensible wheels not vitara rims!

On 5th Sep, 2011 Vegard said:
I stand corrected. You should know *wink*

t3gav

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kent

9th Aug, 2006 at 08:29:49pm

search for lsd, you may change your mind, i'd personally just go with a crosspin diff.

danwebster

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9th Aug, 2006 at 09:29:13pm

Try a quaife ATB diff, very user friendly but work extremely well in a road / track car.


Tom Fenton
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9th Aug, 2006 at 09:30:22pm

On 09/08/2006 21:29:13 danwebster said:
Try a quaife ATB diff, very user friendly but work extremely well in a road / track car.


Yes I will second that comment.


On 29th Nov, 2016 madmk1 said:

On 28th Nov, 2016 Rob Gavin said:
 I refuse to pay for anything else


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BENROSS

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9th Aug, 2006 at 09:46:17pm

the FD sounds right to me






Scruffy

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10th Aug, 2006 at 03:27:18pm

On 09/08/2006 21:46:17 benross said:
the FD sounds right to me


Agree but you will not get a cwp for an LSD in that ratio as it will not fit as the o/d for the lsd is too big to fit inside a crownwheel for a 3.2 ratio! Show me a link for an available part and I will eat my words!

On 5th Sep, 2011 Vegard said:
I stand corrected. You should know *wink*

turbodave16v
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SouthPark, Colorado

10th Aug, 2006 at 04:14:42pm

If you're willing to machine a LSD and Crownwheel, then crack on...

Harry commented on how much of a pain this was, due to the VERY hard surfaces that had to be machined through.... it wasn't just a hard case-depth, but a high-grade material alltogether.

http://www.turbominis.co.uk/index.php?p=14&album=26

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Scruffy

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10th Aug, 2006 at 07:20:32pm

On 10/08/2006 16:14:42 TurboDave said:
If you're willing to machine a LSD and Crownwheel, then crack on...

Harry commented on how much of a pain this was, due to the VERY hard surfaces that had to be machined through.... it wasn't just a hard case-depth, but a high-grade material alltogether.

http://www.turbominis.co.uk/index.php?p=14&album=26


Some fantastic machining but some very thin bits of metal between the teeth and where the lsd bolts to the crownwheel??

On 5th Sep, 2011 Vegard said:
I stand corrected. You should know *wink*

turbodave16v
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SouthPark, Colorado

10th Aug, 2006 at 07:45:06pm

Totally agree.
General 'rule of thumb' is 1x tooth height under the root diameter; but if the bending stresses are low enough then around 0.8 tooth-height is manageable.

I'm pretty sure this will be fine however - but if doing it again, a smaller diameter would be preferable for sure.

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



danwebster

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10th Aug, 2006 at 07:48:40pm

Incidentally, KAD have started making some very high spec CWP's which are also priced reasonably. If you have problems with eating pinions like me they're worth considering.


Scruffy

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11th Aug, 2006 at 09:02:31am

On 10/08/2006 19:48:40 danwebster said:
Incidentally, KAD have started making some very high spec CWP's which are also priced reasonably. If you have problems with eating pinions like me they're worth considering.



4:1 & 4:3 only though

On 5th Sep, 2011 Vegard said:
I stand corrected. You should know *wink*

danwebster

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11th Aug, 2006 at 12:00:46pm

They'll be doing shorter and longer soon though apparently.

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