Just got me a 3.91 R&P

JCz04Bimmer · 07-10-2009, 03:19 PM

Yep. I pulled the trigger. There's a guy over on E46Fanatics that has been selling slightly used 3.91 ring and pinion sets for pretty much half the price they go for at Turner. They're used by a race team, I believe, for a few events and then get yanked as part of their maintenance procedures for the season. Apparently, the ones he sells are completely unblemished and like-new but I'll certainly confirm that when I have the part in front of me. I got one that's polished.

Here's the link...

http://forum.e46fanatics.com/showthread.php?t=668526

epbrown · 07-10-2009, 05:02 PM

Nice - you'll like it!

mimsterzx7r · 07-10-2009, 07:43 PM

Sorry for the noob question but whats the difference between the polished and unpolished set?

epbrown · 07-10-2009, 08:44 PM

Two advantages cited are that polished runs cooler due to lower friction and you can skip the 1200-mile break-in period since any metal shavings were polished off. That they run quieter is up for debate.

Z4MCJJ · 07-10-2009, 09:56 PM

'nother noob question...how hard are these to install?

epbrown · 07-10-2009, 10:28 PM

Quote:

Originally Posted by Z4MCJJ

'nother noob question...how hard are these to install?

With just the gears, it will require removing and rebuilding the diff with the new gears inside - not for amateurs, usually runs $700 or so at a shop and takes a day or two.

Or you can buy a diff pre-built from most tuners for $2500 (Dinan, AC Schntizer, Hartge, Hamann) and install takes a couple of hours. The route you're taking is lots cheaper.

07-10-2009, 03:19 PM	#1
JCz04Bimmer Captain 32 Rep 606 Posts Drives: 06 Z4MC Join Date: Feb 2008 Location: New York City iTrader: (2)	Just got me a 3.91 R&P Yep. I pulled the trigger. There's a guy over on E46Fanatics that has been selling slightly used 3.91 ring and pinion sets for pretty much half the price they go for at Turner. They're used by a race team, I believe, for a few events and then get yanked as part of their maintenance procedures for the season. Apparently, the ones he sells are completely unblemished and like-new but I'll certainly confirm that when I have the part in front of me. I got one that's polished. Here's the link... http://forum.e46fanatics.com/showthread.php?t=668526 __________________ \|www.onehotlap.com\|Real People\|Real Cars\|
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07-10-2009, 05:02 PM	#2
epbrown Colonel 60 Rep 2,128 Posts Drives: BMW M Coupe, Porsche Boxster S Join Date: May 2007 Location: Chicago, IL iTrader: (0)	Nice - you'll like it!
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07-10-2009, 07:43 PM	#3
mimsterzx7r Private First Class 5 Rep 161 Posts Drives: 07 M Roadster, 03 Pathfinder Join Date: Oct 2007 Location: Houston, TX iTrader: (0)	Sorry for the noob question but whats the difference between the polished and unpolished set? __________________ ZHP knob/Zeckhausen CDV/ESS Tune/More to come
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07-10-2009, 08:44 PM	#4
epbrown Colonel 60 Rep 2,128 Posts Drives: BMW M Coupe, Porsche Boxster S Join Date: May 2007 Location: Chicago, IL iTrader: (0)	Two advantages cited are that polished runs cooler due to lower friction and you can skip the 1200-mile break-in period since any metal shavings were polished off. That they run quieter is up for debate.
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07-10-2009, 09:56 PM	#5
Z4MCJJ Lieutenant 4 Rep 448 Posts Drives: Z4MC Join Date: Dec 2008 Location: Z4MC iTrader: (0)	'nother noob question...how hard are these to install?
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