128 Diff Pumpkin Versus 135 Diff Pumpkin

Kgolf31 · 01-15-2014, 02:31 PM

To those who are fairly knowledgeable on differentials for the 128/135.

I realize that the 128 has a rear end of 3.32 versus the 135 which is 3.08. That is why there is a variation in part numbers.

However, does anyone know if the pumpkin (or diff casing) is the same size for each?

Reason I'm asking, is that OS Giken and other companies offer clutch style LSDs to the 135 and not the 128. If there is no other difference other than actual final drive...theoretically we should be able to use 135 LSD offerings. Right now we are restricted to torsen type LSDs

As well, in addition, does our diff pumpkin match the same size of older BMWs that were offered LSDs from factory (like E30s and early E36s? they both have the same ring gear size). Ideally, the cheap solution would to be using one of those LSDs in our cars.

Thanks in advance,

P90Puma · 01-15-2014, 03:40 PM

128i 6MT (can't speak for auto) is the 135i auto pumpkin size.

TheSt|G · 01-15-2014, 04:11 PM

I don't think it shares dimensions with older BMW diffs, but frankly I'm out on a limb here. For the e82 Quaife offers two different diff covers, one of which works for the 6MT 128i. This definitely implies there is some variance out there.

We really need to get Harold from HP in here.

Blacksport · 01-15-2014, 04:18 PM

BMW diffs are 3 sizes, measured by the ring gear outer diameter:

168mm = most 4 cylinders

188mm = most 6 cylinders

210mm = V8s or bigger, some M3s

Both the 128 and 135 have 188mm ring gears

BTW, the 128 manual ratio is 3.23, not 3.32.

Suprgnat · 01-15-2014, 04:44 PM

Quote:

Originally Posted by Kgolf31

Right now we are restricted to torsen type LSD

http://diffsonline.com/bmw-128-diffe...l#.UtcN7HPTmAg

Diffsonline choices for the 128i are:
2 clutch
3 clutch
3 clutch ramps
DifsOnline helical
Wavetrac
Quaife
Kaaz
OS Giken
Race Only

andrey_gta · 01-15-2014, 04:51 PM

Any links to kaaz for 128i? Never heard of this brand

Suprgnat · 01-15-2014, 04:54 PM

Quote:

Originally Posted by andrey_gta

Any links to kaaz for 128i? Never heard of this brand

http://www.kaazusa.com

Kgolf31 · 01-15-2014, 05:53 PM

Quote:

Originally Posted by Suprgnat

http://diffsonline.com/bmw-128-diffe...l#.UtcN7HPTmAg

Diffsonline choices for the 128i are:
2 clutch
3 clutch
3 clutch ramps
DifsOnline helical
Wavetrac
Quaife
Kaaz
OS Giken
Race Only

Wow, I must of completely missed this site while searching.

Thanks a ton! Now just gotta narrow down which will be best for my build. Perfect too, don't need to worry about installing the chunk and I can just throw it up into the car.

Good as well they offer 3.23 (yes I mistyped in the OP). It is required to maintain stock ratio for SCCA STX Autocross

Looks like 2 clutch or 3 clutch would be the best bet to go with. Opinions?

01-15-2014, 02:31 PM	#1
Kgolf31 Brigadier General 459 Rep 4,531 Posts Drives: 2007 Z4MC, 2012 128i Join Date: Sep 2008 Location: Ohio iTrader: (4)	128 Diff Pumpkin Versus 135 Diff Pumpkin To those who are fairly knowledgeable on differentials for the 128/135. I realize that the 128 has a rear end of 3.32 versus the 135 which is 3.08. That is why there is a variation in part numbers. However, does anyone know if the pumpkin (or diff casing) is the same size for each? Reason I'm asking, is that OS Giken and other companies offer clutch style LSDs to the 135 and not the 128. If there is no other difference other than actual final drive...theoretically we should be able to use 135 LSD offerings. Right now we are restricted to torsen type LSDs As well, in addition, does our diff pumpkin match the same size of older BMWs that were offered LSDs from factory (like E30s and early E36s? they both have the same ring gear size). Ideally, the cheap solution would to be using one of those LSDs in our cars. Thanks in advance,
	Appreciate 0 Tweet Quote

01-15-2014, 03:40 PM	#2
P90Puma Would rather be driving. 12 Rep 175 Posts Drives: 2008 135i 6MT M-Sport Join Date: Aug 2013 Location: Ontario, Canada iTrader: (1)	128i 6MT (can't speak for auto) is the 135i auto pumpkin size. __________________ 135i JB4 w/ BMS Flash
	Appreciate 0 Quote

01-15-2014, 04:11 PM	#3
TheSt\|G Resident Tamed Racing Driver 298 Rep 4,697 Posts Drives: 911, 130is, E39 M5, E36 M3 Join Date: Mar 2008 Location: Outside Philly iTrader: (2)	I don't think it shares dimensions with older BMW diffs, but frankly I'm out on a limb here. For the e82 Quaife offers two different diff covers, one of which works for the 6MT 128i. This definitely implies there is some variance out there. We really need to get Harold from HP in here.
	Appreciate 0 Quote

01-15-2014, 04:18 PM	#4
Blacksport Second Lieutenant 54 Rep 246 Posts Drives: 2013 128i Join Date: Oct 2013 Location: Ft Lauderdale iTrader: (0)	BMW diffs are 3 sizes, measured by the ring gear outer diameter: 168mm = most 4 cylinders 188mm = most 6 cylinders 210mm = V8s or bigger, some M3s Both the 128 and 135 have 188mm ring gears BTW, the 128 manual ratio is 3.23, not 3.32. __________________ '13 128i 6sp, '19 Cherokee Ltd 3.2, '17 Ducati SuperSport S *Gone But Not Forgotten:* 74 Z28, 77 Datsun 280Z (1st 5sp in US), 92 Nissan 300ZTT, 94 MB SL600 V12, 01 M Roadster, 66 Yamaha TwinJet 100, 70 Suzuki X6 Hustler *Race:* GP/FP Spitfire SCCA, Merlyn FF SCCA, Mazda RX7 IMSA GTU, Yamaha FZR 400 AMA.
	Appreciate 0 Quote

01-15-2014, 04:51 PM	#6
andrey_gta Brigadier General 298 Rep 4,040 Posts Drives: 130i coupé ;) Join Date: Nov 2011 Location: Bimmerpost iTrader: (1) Garage List 2008 BMW 128i [10.00]	Any links to kaaz for 128i? Never heard of this brand __________________ 128i Sport 6MT converted to Euro 130i spec, 3.73 diff, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE In-progress: //M front arm, M3 rack, e36M lip Wishlist: Coils, n55 mnts, headers, LSD, e60 finn diff "The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is
	Appreciate 0 Quote