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06-19-2015, 08:59 PM | #1 |
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Australian supplier for LSD diffs for a DCT car
Hey Australian folks,
Does anyone know of an Australian supplier that sells and modifies stock diffs to install an LSD for a dual clutch transmission car (2.56 ratio with welded crownwheel)? thanks, Steve. |
06-20-2015, 01:54 AM | #2 |
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06-20-2015, 06:37 AM | #6 |
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thanks Imske3000.
Whats involved in the machining? Where did you get the details on what needed machining? do you just remove the weld? or clean up the face of the crownwheel? or take material off the crownwheel. I assume the crownwheel steel is quite hard, so the drilling and tapping could be a PITA. What shop did you get the machining done? Ive rebuilt diff's before, so would be comfortable putting parts together myself - just the modifications are out of my league (don't have a lathe or mill) cheers, Steve |
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06-20-2015, 07:52 AM | #7 |
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BMW went from a bolted diff to a welded diff purely as it was a cheaper method to manufacture.
So when upgrading, you need to remove the ring gear from the carrier by machining the weld. Once thats done and the ring gear is separated you have to machine the ring gear and drill and tap it. Obviously not with a hand drill, but in a CNC machine centre ideally (precision!) |
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06-20-2015, 08:51 AM | #8 |
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Give the guys at Craft Differential in Holroyd a call. You will also need to replace all the diff seals and dust covers, you can get them at ECS.
This is a link to how it's done, it is a very precise procedure, the guy was telling me he has 1-2 micrometers of play http://www.vacmotorsports.com/blog/v...-how-we-do-it/ |
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06-20-2015, 05:14 PM | #9 |
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Thanks guys - yeah I've seen that article before so I know roughly what's involved.
My thought was how much material needs to be milled of the crownwheel, what's the bolt diameter and thread pitch? etc etc. Where does one find this information? Is it provided with the sale of the LSD? I presume this sort of thing would be a trade secret. thanks, Steve |
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06-20-2015, 06:01 PM | #10 | |
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06-20-2015, 06:22 PM | #11 |
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Ive emailed ECS tuning to ask if the diff comes with a dimensions drawing.
According to the Wavetrac website the bolts are supplied with the fitting kit (a $600USD extra) http://www.wavetrac.net/application_bmw335.htm |
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06-20-2015, 07:30 PM | #13 |
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SoutherBM stock Quaife.
Another option is a 1M/M3 diff swap. Cost around the same too. |
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06-20-2015, 08:37 PM | #15 |
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Mfactory also sell brand new final drive sets for 135/335 which includes a new bolt-up ring gear and pinion. Buying a new gearset seems to be cheaper than the cost of machining your welded gear.
Unfortunately they only fit US spec 6MT cars for the 135i - they say the EU and AU cars have a different driveshaft flange. They claim it should work for the 6MT if we change the driveshaft flange to a 335i flange, but I can't get anyone knowledgeable locally to confirm that. If I could, it could halve the price of an LSD for a 6MT. It may be different for the DCT - i'd suggest contacting them. |
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06-20-2015, 09:01 PM | #16 |
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I was where Griffster was in my research and nobody could confirm it so I got it machined. If you can find someone to confirm you will save over $1000.
I have the Mfactory helical, the guys who did mine have done quite a few Mfactory diffs for BMWs and had a template they created so that was a little more piece of mind. |
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06-21-2015, 05:33 AM | #17 |
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06-21-2015, 10:55 PM | #19 |
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I bought the whole pumpkin with the LSD already installed from the US.
Shipping wasn't cheap but it meant I didn't have to find someone local to do the machining. |
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06-21-2015, 11:36 PM | #20 |
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06-22-2015, 12:25 AM | #22 |
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I have a Wavetrac.
A shop in california sourced a second hand low mileage DCT diff, did all the machining and installed the LSD, then shipped the whole thing over. Took a couple of months and was around $3500 (including shipping) back in 2013. I think Mfactory will do the same thing for slightly cheaper, they are a vendor here so it's worth asking them. |
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