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  1. Diff ratio

    General BMW Discussions
    Hi all, Just had my diff replaced with a reconditioned one. I drove the car today and there is a low rumbling coming from the rear of the car and I don’t seem to need to change gear as quickly. I suspect I’ve been sent the wrong ratio diff despite specifically asking the supplier if the one I...
  2. 2009 E92 - Tyre Ratio - Changing to 255/40/18 & 225/45/18

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Hi guys, I was wondering if anybody has ever gone for higher profile tyres? I've been offered a set of Bridgestones S001s runflats for a steal. I can get 225/40/18 or 225/45/18 for the front, but only 255/40/18 for the back. They're BMW runflats but obviously not the ones recommended for...
  3. Can you swap a 3.46 ratio diff from an auto e46 into a manual e36 328i?

    BMW 3 Series Forum - Technical Talk on the BMW E21
    I'm trying to liven up my manual e36 328i and I've read that getting a diff with a shorter ratio can make the car a lot quicker. Most suggestions were to swap in a 3.15 from a 325i or m3 however, in Australia, these diffs are hard to come by and are REALLY expensive. However, automatic 6...
  4. 2007 BMW X5 Rear diff ratio

    BMW Garages and Parts Retailers
    Hi All I`m looking for a used rear differential for an X5, my car has been off the road for 6 weeks simply because I cannot find out what the correct diff ratio is, even BMW dealers cant help, it could be 3.64 or 3.15 but know one seems to know. can anyone help????
  5. limited slip differential options

    BMW 3 Series Forum - Technical Talk on the BMW E46
    Hi All, I've been doing a bit of research regarding my '01 325Ci and I am a bit lost regarding limited slip diffs in the context of drifting. If I read up correctly, helical LSDs are out as they don't lock, they bias the torque to the wheel with more grip. Correct me please if I am wrong on...
  6. Replacing my 3,23 diff with a 3.91 ratio

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Hi guys in desperate need of a diff for my 318i which as a 7524317 3.23 ratio diff which it seems I cant get a hold of unless I want to pay 700+, can I replace the diff with a 7524325 3.91 ratio diff from the same engine car as I see a lot of people upping the diff ratio for shorter gears? Mark
  7. Compression Ratio help required!!!

    BMW Tuning Forum
    Im struggling to work out the compression Ratio and how it all works! But Im building an M50b30 stroker and turboing it. I had an MLS on it before the M54B30 crank went in, but since its all changing I will need to find the compression Ratio so I can either get forged pistons or a headgasket...
  8. Rear diff ratio

    BMW Tuning Forum
    Hi everyone, been lurking for a while. I am currently running a BMW 530 diesel engine in my 1947 Dodge pickup truck. The truck used to run a BMW 2.5 diesel and 5 speed manual box and a 3.50 ratio rear axle. The engine and diff was taken from an auto 530d, the gearbox is 5 speed manual a from a...
  9. Highest ratio diff for a e36 328i sport

    BMW 3 Series Forum - Technical Talk on the BMW E21
    What is the highest ratio diff that will bolt into my e36 328i sport?
  10. Rear diff ratio

    General BMW Discussions
    Hi everyone new to all this can anybody help! Was looking to find out the ratio for the rear diff on my e92 320d m sport 177bhp thanks 2008
  11. m50 stroker compression ratio

    BMW Tuning Forum
    Hi fellas. I have a m50 3l stroker in my car, m50 block with m54b30 internals and m50 nv head, and i have vanos head that i want to put on my engine insted of nv head. I plan to put m3 cams and rise compression ratio by using .030 mls instead of .070 so question is it safe and what CR i get with...
  12. different ratio diff to standard

    BMW 3 Series Forum - Technical Talk on the BMW E46
    hi, a couple of weeks ago i posted a thread regarding a noisy rear diff. the exact 1 i was looking for wasn't available E91 3.45 Ratio 2.0 petrol manual i was talking to a m8 who owns a bmw and his m8 says " you can fit a different ratio, doesn't HAVEto be the exact one, but it will alter...
  13. Differential gear ratio

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Hi, The diff had died in my car ? and merc to replace it however, due to short gear changes it had compared to my previous bmws im not sure if the diff that's currently in the car is the correct one. What should the correct gear ratio be at the rear diff on a e90 m sport 320 D 2009 model lci...
  14. Todays gearbox problem, ratio monitoring 3/4

    BMW 5 Series - Tech Talk For All Gen Of 5 Series
    Well, thought Id cracked it with the friction additive. Revs stopped bouncing, smooth gear changes. Happy days...... Todays new problem is while under hard acceleration in 3rd gear, I suddenly lost drive and revs went to the limiter. I let off the gas and drive was restored. Keen to find out...
  15. FOR SALE: E39 540i LSD. 3.15 ratio

    BMW Parts for Sale
    Hi I have for sale an E39 m5 LSD that has been re-housed in a 540i diff case. This makes it plug and play for 540i or whatever else a 540i is compatible with. I was going to fit to my E38 that i was doing a 6 speed conversion to, however I'm now fitting the 4.4 and 6spd to an E30. £450...
  16. X5 front to rear tyre ratio

    BMW X Series - Tech Talk For All Gen Of X Series
    I have a X5 3.0 d sport 06 with standard 19" 255x50x19 with 285x45x19 on rears Would 22" 285x35x22 on 10j wheels all round off a range rover sport have the correct front to rear ratio or would I have to up rears to 295 etc
  17. P0733 gear incorrect ratio e46 330

    BMW 3 Series Forum - Technical Talk on the BMW E46
    Unfortunately my 330ci gearbox cog light has appeared this isn't the first time either it appeared around two months ago I turnt off the car and it didn't come back on again ,until now twice in one week , today I was able to plug my reader to the car and it returned the fault code p0733 gear 3...
  18. Bmw 320i e91 touring - rear diff gear ratio / bearings

    BMW 3 Series - Tech Talk For All Gen Of 3 Series
    Hi all, we have got a problem with a rear diff which has got noisey bearings. We took it to a axle spiealist who stripped it down for us and later found out we wasnt able to get any replacement bearings. We have also searched for a second hand rear diff but no joy as the info on the gear ratio...
  19. Bmw 850 lsd 3.9 ratio diff available soon

    BMW 8 Series Forum - Technical Talk on the BMW E31
    Apologies if this is incorrect form. For all you 850Ci speed merchants! I may have available in 3 weeks my lsd 3.9 ratio diff since I am putting a 3.15 lsd from a 750L in its place. Anyone interested.?
  20. Rear Diff for E53 2006 X5 - ratio 3.91

    AUTOVERA.LT- BMW used parts,vehicles,auto-service
    Hi, Looking for rear diff for my X5 . TIA Phil
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