Quote:
Originally Posted by vtl
Ha, I'm just imagining a popeye character who downs a bottle of JD and pops off the driveshafts with ease.
Doing some research on the nominal dimensions of the custom driveshaft that will need to be developed. Ideally I would get a spare propshaft from a wrecked 135i so I can revert the car when it comes to selling, then sell the M3 diff separately. Obviously I will measure this on the car but it would be good to get the nominal dimensions so there is something to work off.
These lengths have been obtained via RealOEM:
Few things to note: Eurospec n54 135i had flex disc joints to the diff where US spec cars had a single nut coupling (insert nut) for the prop->diff coupling. This obviously alters the total length of the driveshaft.
1M and 135i N55 uses GS6-45BZ gearbox
135i N54 uses GS6-53BZ/DZ gearbox
135i N54 and N55 uses 33107571187 open differential
1M uses limited slip differential
1M driveshaft manual transmission 26107619258 (L=1339MM) (CV joint)
135i n55 driveshaft manual transmission 26107614420 (L=1385MM) (insert nut)
135i n54 driveshaft manual transmission 26107588132 (L=1353MM) (flex disc)
135i n54 driveshaft manual transmission 26107567933 (L=1371MM) (insert nut)
135i n54 driveshaft auto transmission 26107574680 (L=1373MM) (insert nut)
46mm difference between 1M and 135i n55 driveshafts -> 46mm of length due to CV joint on 1M
135i N54 and N55 share the same differential, 135i N55 and 1M share the same gearbox
Apply same offset to same style driveshaft for n54:
1371mm-46mm = 1325mm overall length for hybrid driveshaft
alternatively work out the difference in gearbox lengths between N54 and N55/1M:
1385mm-1371mm = 14mm
apply offset to length of 1M shaft 1339mm-14mm = 1325mm
So with 2 seperate measurements giving the same result I am fairly confident that the total driveshaft length needs to be 1325mm. I would use the 135i front section, centre bearing and U joint, and cut off the rear section near the u joint. Then shorten the m3 shaft and weld that onto the 135i shaft.
The only thing I am not sure about is how these propshafts are measured. Do they take the flex disc into account? Also the M3 propshaft is slightly recessed into the diff. Will probably need to physically measure the full length of a 135i shaft and an M3 shaft and compare to the quoted dimensions. Unfortunately I only have the rear section of the M3
DR JEKL, do you have the full section of M3 prop?
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Well I reckon its worth a try, or if you have a good looking wife or gf send them into your local diff/driveshaft specialist as a damsel in distress!!
Cant help you with prop shaft measurements as I haven't needed to do any research on that at all really...
No I didnt get a M3 prop, I bought a cheap 740i prop shaft (has the same flange as the M3 diff) and will frankenstein that up with my 335i propshaft