coyoteboy
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| posted on 16/3/11 at 02:58 AM |
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4.29 LSD too high?
Throw it through the gear calc and its a redline of 107mph on a thunderace engine. Too nutty? Impossible fuelaholic on m/ways?
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snapper
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| posted on 16/3/11 at 05:30 AM |
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4.29 to low, the higher the number the lower the ratio, ie 4.29 turns of the prop to 1 wheel rotation.
Depending on what gearbox you are using, if a standard box I would suggest 1st gear would be unusable running out of revs at 20 mph second at 40+
you would need a very close ratio box with a 2.2 first gear to make this work.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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carpmart
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| posted on 16/3/11 at 07:31 AM |
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In a word........ YES!
You only live once - make the most of it!
Radical Clubsport, Kwaker motor
'94 MX5 MK1, 1.8
F10 M5 - 600bhp Daily Hack 
Range Rover Sport - Wife's Car
Mercedes A class - Son's Car
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lsdweb
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| posted on 16/3/11 at 09:08 AM |
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What are you going to use it for?
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coyoteboy
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| posted on 16/3/11 at 10:53 AM |
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Working on a bike engine such as the thunderace. The speed calc in the bike section suggests max speed in 1st of 45, max speed in 5th of 107 if I put
the figures in correctly at 4am. 
(high, low - depends how you're thinking - it's a high ratio of prop turns to wheel turns )  It's the rear diff off a toyota
ST205, so a nice high performance torsen.
For use around the roads, not worried about top end speeds really but don't want to find myself beating my head against a brick wall if I choose
to do 200 miles in it, even if I am a bit of a masochist!
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Liam
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| posted on 16/3/11 at 12:38 PM |
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Whilst I dont know the exact specs of the thunderace engine (power and redline), from your gear/speed figures I would say that is way too low
geared!
Motorway cruising would be horrible - think about it you'll be somewhere between 2/3 and 3/4 of the redline at a 70-ish mph
'cruise'. That'll be what? - 8000? 9000? Wont sound nice, will drink fuel and probably wont do the engine any good at all.
Again, I dont know the power, but assuming typical BEC performance, on the track, even on the short, tight windy ones you'll be bouncing off the
limiter in top on anything remotely straight.
So rubish on the road and rubish on the track, imho!
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coyoteboy
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| posted on 16/3/11 at 05:16 PM |
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T-Ace is ~140hp, 5 speed, 11.5K redline IIRC.
Yep, 70 would be cruising at 7500rpm which is only 1K more than the standard diff solutions with a redline of 125.
The other option is to re-house the torsen in a chain drive I suppose, or find a different torsen diff.
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