blakep82
|
| posted on 10/2/11 at 09:24 PM |
|
|
bmw diff ratios
was looking up something to do with trikes yesterday, and thinking about car diffs that work best with car engines, obviously the 3.14 sierra diff is
favourite, but bmw seem to have a lot of diffs with similar ratios
http://www.bokchoys.com/differential/GearRatios.htm
there's some 3.15 and 3.07 ratios is e36 and e46 3 series bmws, so would this make a good change (read, better available) to the sierra ones? or
am i missing something about bec diffs?
[Edited on 10/2/11 by blakep82]
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
|
|
daviep
|
| posted on 10/2/11 at 09:53 PM |
|
|
BMW diffs weigh more than most BEC kit cars.
Edit: because I'm retarded
[Edited on 10/2/11 by daviep]
“A truly great library contains something in it to offend everyone.”
|
|
|
blakep82
|
| posted on 10/2/11 at 09:59 PM |
|
|
how much do they weigh compared to a sierra diff though? i can't imagine they're THAT much heavier
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
franky
|
| posted on 10/2/11 at 10:03 PM |
|
|
They are heavier but better built and you can get a 3.15 with a proper LSD for £250ish. Caterham are now using them on all new cars.
|
|
|
blakep82
|
| posted on 10/2/11 at 10:06 PM |
|
|
was still thining along my F1 sidecar/trike idea, and it could be done as a trike, but would need 2 driven wheels at the back, and thought for a bike
engine, those diffs have got to be better than the sierra ones
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
Simon
|
| posted on 11/2/11 at 12:31 AM |
|
|
I have a 2.28:1 that'll be going in mine. Non lsd, from 330d, £150 from delivered from germany.
Weight is 40kg - heavier than Sierra by about 13 kg.
ATB
Simon
|
|
|
blakep82
|
| posted on 11/2/11 at 12:36 AM |
|
|
hmm, its quite a lot more, but i wouldn't say its enough to worry about it being tooooooo heavy. if it was literally twice the weight then yeah,
but thats not bad i don't think. hmmm 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
Simon
|
| posted on 11/2/11 at 12:43 AM |
|
|
The Jag unit I was gonna use was nearer 50.
Look at it this way, if I lose 2 stone (and I need to lose 4) I'll be quits on the diff weight increase.
Don't forget this is probably one of bmw's heavier diffs - I'm sure a 318 petrol would (probably) be similar weight to Sierra
unit.
ATB
Simon
|
|
|
franky
|
| posted on 11/2/11 at 07:22 AM |
|
|
As above, bmw do what known as small/medium and large cased diff's.
I've a spare 3.15 medium case none lSD diff I can weigh for you over the weekend? Its the same as whats in my build except i've got the
slippy version.
|
|
|
