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Westy Ratio Help - Suggestions Please
DixieTheKid - 20/9/11 at 08:07 PM

Evening all,

I'm pretty pants went it comes to ratios etc so im open to all options/opinions regarding my build.

I have a YB Cosworth Lump which will be coupled to a T5 gearbox. I have a 3.14 diff which im going to sell and purchase a LSD. What would be the best ratio diff to try and get bearing in mind i want to put some big alloys on it which leads me onto another question, whats sensible size wheels can be used to fill the arches?

I suppose i should add that the Westy is going to be a bit of a road toy, is not going to see the track that often so it need to be drivable if that makes sense?

Cheers Chris

[Edited on 20/9/11 by DixieTheKid]

Andy B - 20/9/11 at 08:31 PM

I am afraid I can't help with the ratio side of things but I do have a customer who would be interested in the 314 diff if that helps
Regards
Andy

DixieTheKid - 20/9/11 at 08:47 PM

quote:
Originally posted by Andy B
I am afraid I can't help with the ratio side of things but I do have a customer who would be interested in the 314 diff if that helps
Regards
Andy


Thats diff is drumming up a lot of interest. U2u offer if you like.

Gary 7 - 20/9/11 at 09:13 PM

For the diff ratio if using ford lsd its 3.62 and 3.92 i think. Try this gearcalc , input wheel tyre sizes diff ratios choose gearbox t5 from the list
http://locost7.info/gearcalc.php

Chippy - 20/9/11 at 09:50 PM

Using the Cossy I would stick with the 3.14 and get an LSD fitted to it. I have the V6 Cossy and am fitting a 3.14 with after market LSD, because the 3.62 LSD just is not long enough. HTH Ray

westy turbo - 21/9/11 at 04:40 AM

The 3.92 with a T5,works awesome,the only think is it redlines at about 225-230 but how often u going to need more

snapper - 21/9/11 at 06:25 AM

Let me assure you, you don't need a 3.14 with that gearbox.
The 3.9 is an option but with the Cossy torque a 3.6 will be good for 1st 2nd and 3rd by then you'll be going quick, 4th will take you to any speed quickly and 5 will be a long cruise gear.

mcerd1 - 21/9/11 at 10:48 AM

all the rwd sierra cossie's uesd a T5 with a 3.64 LSD (7.5" ) as standard
so you shouldn't be far off the mark with a 3.62 diff for road use - it'll depend a little on your tyre size but you can always go up or down a size/profile for the fine tunning

the standard cossie's use 205/50 R15 tyres - so that'll give you a benchmark

e.g. a 245/45 R16 would be effectivly 7% higher geared than the origonal cossie, but a 185/60 R13 would be ~6% lower geared and so on...



[Edited on 21/9/2011 by mcerd1]

DixieTheKid - 21/9/11 at 06:36 PM

Whats the norm with regards to wheel size for a 7 or isn't there?

mcerd1 - 22/9/11 at 07:13 AM

not really a normal for a seven as such - most are between 13" and 15" wheels but with all kinds of widths and tyre sizes
I think most of the westfield's use similar sizes but I've no idea what they are
(might be worth asking some of the guys on the westie forum, I know a few of them have YB engines as well)

the ones I do know are the dax's, but they are generaly much bigger. the wide rear arch option is just big enough for 9.5" - 10" wide rims - some folk run as big as 255/40 R17's (mine are 'only' 245/45 R15)

westy turbo - 22/9/11 at 03:14 PM

8x13 to the front,10x13 rear for my westy ,or go to 15"

DixieTheKid - 22/9/11 at 04:15 PM

Thanks for that info. Had a lot of interest in the diff, please note its sold. Cheers chris

[Edited on 22/9/11 by DixieTheKid]