joni
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| posted on 16/6/12 at 08:50 AM |
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busa diff help needed
Hi iam building a westfield seiw at the min it will be for sprints and hillclimbs not for road use
thing is what diff to use eather the ford one or the freelander can any one help
the car will be running on 13" wheels and a hayabusa engine so the question is....... freelander with what c.w.p or
ford
with what c.w.p
thanks for any help joni
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phelpsa
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| posted on 16/6/12 at 08:57 AM |
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Freelander diffs only have one ratio IIRC, 3.21:1.
I would be using a 7" sierra 3.38:1 if you plan on using slicks at any point. If you plan on going 250+bhp on slicks you will probably want to
look at the 7.5" diff.
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joni
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| posted on 16/6/12 at 09:02 AM |
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what car is the 3.38 out of and are they easy got
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phelpsa
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| posted on 16/6/12 at 09:16 AM |
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quote:
Originally posted by joni
what car is the 3.38 out of and are they easy got
I'm not sure (auto springs to mind?) and not really. Give Road and Race Transmissions a call
(http://www.ikent.co.uk/profile/233087/Sevenoaks/Road-and-Race-Transmissions/) and see what they have would be my advice.
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joni
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| posted on 16/6/12 at 09:20 AM |
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do some people use the 3.14 cwp in there busas
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phelpsa
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| posted on 16/6/12 at 10:05 AM |
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quote:
Originally posted by joni
do some people use the 3.14 cwp in there busas
Not very often for speed events. But it depends on what diameter tyres you are using.
[Edited on 16-6-12 by phelpsa]
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joni
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| posted on 16/6/12 at 11:24 AM |
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i take it your car is for sprints and hillclimbs do you use the atb or just the cossie lsd with the 3.38 cwp
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phelpsa
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| posted on 16/6/12 at 11:34 AM |
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quote:
Originally posted by joni
i take it your car is for sprints and hillclimbs do you use the atb or just the cossie lsd with the 3.38 cwp
I actually use a 3.62:1 with viscous LSD and 20" diameter slicks as the GSXR1100 gearing is very different to the hayabusa. However from my
research when I was looking at diff ratios I found that most of the hayabusa engined cars were running 3.38:1 CWPs transfered onto a viscous LSD (or a
plate style LSD), and 22" diameter rear slicks.
R&RT built mine with a good 2nd hand CWP and viscous unit and all new bearings etc using my casing for a little under £400. They had all sorts of
ratios and diff units in their stores, so its worth giving them a ring.
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parkiboy
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| posted on 16/6/12 at 12:16 PM |
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i've been doing alot of research about this lately and still havent come up with a solid answer as it all seems to be a matter of personal
preference.
My car is running a 3.14 diff and i was wondering if it was the right diff for me but after the IVA only time will tell i suppose!
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parkiboy
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| posted on 16/6/12 at 12:16 PM |
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*Double Post*
[Edited on 16/6/12 by parkiboy]
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Nick DV
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| posted on 16/6/12 at 12:38 PM |
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quote:
Originally posted by parkiboy
i've been doing alot of research about this lately and still havent come up with a solid answer as it all seems to be a matter of personal
preference.
My car is running a 3.14 diff and i was wondering if it was the right diff for me but after the IVA only time will tell i suppose!
I'd keep the 3.14 as it's ideal for the car, and they are like rocking horse pooh!!
Cheers, Nick 
"The force will be with you, always!"
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joni
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| posted on 16/6/12 at 05:00 PM |
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tis yours a road car iam realy looking to find out about hillclimb and sprint cars mine wont be on the road
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parkiboy
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| posted on 16/6/12 at 05:38 PM |
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Yes mines a road car from what I've read people favour the 3.14 for track day for the top speed on the straights but if that's not what
your after ther 3.38 or 3.62 should be fine as you will get better acceleration but less top speed, although I'm not an expert this is just what
I've read over the last couple of days.
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joni
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| posted on 16/6/12 at 06:24 PM |
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yea i think iam going to have to suck it and see
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Eatpies99
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| posted on 16/6/12 at 08:03 PM |
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mines got a 3.38 in.
Where's this washer come from????
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joni
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| posted on 16/6/12 at 09:11 PM |
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quote:
Originally posted by Eatpies99
mines got a 3.38 in.
"
is yours a sprint car running on 13" wheels mate
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Eatpies99
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| posted on 16/6/12 at 10:28 PM |
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afraid not my friend. road car on 15's. Still building at min.
Where's this washer come from????
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Custardpants
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| posted on 18/6/12 at 10:52 PM |
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I'd go for a 3.38. I have the 3.62 and run out of gears on most tracks other than cadwell. Solely for sprints the 3.62 would be okay on 13s with
60 profile Tyres.
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skippad
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| posted on 19/6/12 at 07:40 AM |
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I'm running a 1400 zzr which has very similar gear ratios, i originaly had a 3.62 lsd which was just manic, running out off puff in every gear
and 118mph tops.
I changed to a hybrid 3.14 lsd (3.62 lsd with 3.14 crown) which a transmission company did for me.
Great for road 130mph + (private road) but not ideal for track or sprints, needed a bit more punch out of corners!
Ive been looking for a 3.38, missed a few bargains on ebay!
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