Bigboystoys
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| posted on 12/4/11 at 08:42 PM |
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Bec ratio???
Evening all. Managed to find myself a Capri laser atlas axle today but it has the 3.75 crown and pinion fitted. What would be the best ratio
replacement for a good 70mph cruising speed without silly rpm and still retaining good acceleration. Engine is a 2004 gsxr1000. Many thanks
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Dangle_kt
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| posted on 12/4/11 at 08:45 PM |
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there isn't really a good ratio for 70mph cruising in a BEC with a live axle.
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Bigboystoys
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| posted on 12/4/11 at 08:51 PM |
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Anything has got to be better than my 6k at 50mph!!! My ears bleed.
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daniel mason
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| posted on 12/4/11 at 08:58 PM |
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did one of the capri's not have a 3.08:1 axle. that could be slightly too much for the 1000cc motor though? the busas can run a 3.14:1 diff i
think.
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40inches
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| posted on 12/4/11 at 09:09 PM |
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This any interest http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=121319
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SPYDER
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| posted on 12/4/11 at 09:16 PM |
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You might well get away with the aforementioned 3.08 ratio IF you have 13" wheels and suitable tyres.
Perhaps someone will post a link to the gear ratio-final drive ratio-wheel size-speeds in gears calculator........?
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watsonpj
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| posted on 12/4/11 at 09:18 PM |
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isn't there a 3.44 (yep on ebay)wouldn't that be better, I was running a 3.89 in my english axle and changed to 3.54 and that made my
blade 919 better but still a bit wearing.
cheers Pete
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Bigboystoys
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| posted on 12/4/11 at 09:25 PM |
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Yeh believe the 2.8 Capri axle was a 3.08. That's what I Was thinking at first but if a busa lump turns the 3.14 then maybe I should go for the
3.52. The chart is great by the way thanks for the link will look in detail when a little more awake tomorrow
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Bigboystoys
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| posted on 12/4/11 at 09:26 PM |
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Got your post the second after I returned mine. Looking now. Gotta love eBay. Thanks
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daniel mason
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| posted on 12/4/11 at 09:44 PM |
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yours may still be ok with 13" rims and the 3.08 axle if it has the grunt to rev out in top gear. what are the torque figures on the gsxr like
compared to the busa?
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Dangle_kt
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| posted on 13/4/11 at 08:20 AM |
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I'll be interested in hearing what you have to say if you change.
I imagine it will still be pretty annoying sitting at a constant speed in a BEC... I avoid main roads/motorways at all costs as it does my head in so
much. I looked at the speed calculator a year or two ago and assumed the two english axle ratios were the only ones available without going bespoke...
my bad.
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rf900rush
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| posted on 13/4/11 at 09:12 AM |
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Don't compare between bike for your ratios, as their internal ratios differ a bit
For example. My old RF900 did 6K rpm at 70mph on a 3.92 diff.
Which is simular to my now ZX12r running a 3.62 diff.
Running 17" 225/45 on the rear which helps.
Fast tourers are more likely to have lower ratois.
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Bigboystoys
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| posted on 13/4/11 at 08:42 PM |
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Where to get trailing arm brackets for my atlas axle????
Right got myself an atlas with a 3.44 diff gonna give that a go. Now where is the best place to get the brackets to fit my trailing arms ( 4 of em)
I'm fine welding them on just need to know best place to buy them if you can. Thanks sam
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tony.g
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| posted on 14/4/11 at 09:17 PM |
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What like these?
Locost / Kit Car Escort MK II Axle Brackets | eBay UK
I will be very interested how you get on as i need more top speed.
Tony
[Edited on 14/4/11 by tony.g]
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