Originally posted by c_w
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2002 '52 S54 - Titanium Silver with 18" BBS LMs, AP Racing BBK, KW V3, H&R anti roll bars & ACS flippers (previously 2000 'X' S50 - Arctic Silver)
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This is the email I got back from someone, so there's vat on top of that yet.
if want the ratio changed in yours inc the cwp and if it does not need bearings looking at £400+vat...if want a full diff supplied with a 3.46 looking from £650+vat all checked etc
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Originally posted by clapshot View PostDo you think it's worth getting one built for £650? That seems a lot to me. I could send mine away to the guy and he said he would change it to 3.46 for £400,
I bought my 3.46 for £250 off ebay, luckily it was in good condition (as in quiet) though as it was quite old the lsd wasn't very tight; I have recently rebuild the LSD which is quite an easy job easy job, possible to do without remove the diff from the car. On a bench it would be a nice easy saturday afternoon job. Rebuild kits are available from www.driveandtraction.co.uk.
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Originally posted by c_w View PostI don't think Exdos thought it wasn't worth it, more the diff he fitted had a slight noise he wasnt happy with and I think that plus him getting the Z4M he just put the factory diff back in./// Exdos ///
"Men who try the impossible and fail spectacularly are infinitely superior to those who reach for nothing and succeed" --Napoleon Bonapart
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Originally posted by c_w View PostNot particularly, it's more in gear times and flexibility. For 0-60 and 0-100 times it's about full throttle power from standing start so as long as the gear spacing isn't widely out it will always be in the power, so to a certain extent gearing doesn't actually make a massive difference (within reason). But shorter gearing just makes the engine so much more flexible, for example from 40mph 4th gear on the road it feels much punchier, and where 3rd felt a bit long out of some corners on track it now feels much better.
I really didn't like my car on the Ring with the standard diff, felt like I was in 3rd gear for an age, but now just feels "right" yet the drop to 3.46 isn't that big. I put a lower ratio diff in my 205GTi Mi16, a similar drop to what the Coupe has now and it transformed the car - as said it wasn't for out-right acceleration from a stand still but the flexibility the engine had in gear at more varied speeds.
Granted it's always a balancing act of 2nd too short/3rd too long (as an example) but for me the lower ratio diff suits circuits massively more than the 3.15 diff and on the road the car just feels more lively./// Exdos ///
"Men who try the impossible and fail spectacularly are infinitely superior to those who reach for nothing and succeed" --Napoleon Bonapart
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Originally posted by clapshot View PostWell Exdos, buying a diff for £650 doesn't sound too expensive considering the route you tookLast edited by exdos; 01-03-2013, 11:08 PM./// Exdos ///
"Men who try the impossible and fail spectacularly are infinitely superior to those who reach for nothing and succeed" --Napoleon Bonapart
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this thread is worth a read (if you haven't already)
http://www.z3mcoupe.com/forum/showthread.php?t=10514
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Originally posted by exdos View PostThe gears for the MC are VERY long and I agree that using a higher ratio diff doesn't really alter the overall acceleration times. Obviously, a car will accelerate faster in a lower gear than the next higher gear. As I see it, the point of swapping the diff is more a case of being able to use, say, 4th gear at 5,500rpm at the highest part of the torque curve, rather than 3rd gear at around 7500rpm when the torque output has dropped from the peak. A collection of close ratio gears just seems more normal to use than fewer very long gears.
Yep, why a 6 speed with a 3.46 or 3.64 would be a pretty good combo and what BMW should have done in the first place. It's a bit like how many newer cars are now coming with 7-speed gearboxes, the top speeds and even the top gear mph/1000rpm aren't necessarily higher, the engine just has more gears to choose from to keep it in power/most efficient.Last edited by c_w; 02-03-2013, 05:43 PM.
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