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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #51  
Old 01-27-2013, 09:00 AM
ChasR ChasR is offline
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Location: Atlanta
 
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Mein Auto: 335d, E28 M5, Clubman S
One - you remove the differential from your car and ship it to VAC. They install the quaife and ship it back to you. Your car is inoperable for at least 2 weeks.

Two - VAC installs the quaife in a used differential and ships it to you. You have it installed in your car and ship your old differential to VAC for a refund of the core charge. VAC uses your old diff for the next 335d order. Your car is down for a few hours during the install.

Three - VAC installs the quaife in a new differential and ships it to you. Same as two.
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  #52  
Old 01-27-2013, 11:56 AM
GreekboyD GreekboyD is offline
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Location: Toronto
 
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Mein Auto: 2009 BMW 335d
Thanks a lot man. Really appreciate it.

I'm going to call them this week. I have all of my M3 suspension parts so want to do the LSD when I'm swapping everything out as well.

P.S. So did you go with Option #2 and then got the $900 credit back after you shipped them out your old core after they received it?

Last edited by GreekboyD; 01-27-2013 at 12:03 PM.
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  #53  
Old 01-27-2013, 08:34 PM
ChasR ChasR is offline
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I took option 2,
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  #54  
Old 01-27-2013, 09:16 PM
GreekboyD GreekboyD is offline
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Did you also get the $900 back after sending your core to VAC? I remember them doing that about a year ago.
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  #55  
Old 01-28-2013, 07:32 AM
ChasR ChasR is offline
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Mein Auto: 335d, E28 M5, Clubman S
Transaction happened in January so it's not on my statement yet. I'll get around to the online statement later.
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  #56  
Old 01-28-2013, 11:16 AM
GreekboyD GreekboyD is offline
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Thanks. I remember them doing the $900 credit return last year once they recieved your core so look into it and make sure their accounting department is on the ball!
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  #57  
Old 01-30-2013, 01:13 PM
GreekboyD GreekboyD is offline
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Hey ChasR. Did you send your core back to VAC after they sent you the Quaife? Just wondering because I'm talking to Mike from VAC and he's not sure if they have any cores for the D lying around.

Thanks.
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  #58  
Old 01-30-2013, 02:01 PM
ChasR ChasR is offline
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Mein Auto: 335d, E28 M5, Clubman S
I have delivery confirmation on Jan 14.

I have not recieved credit for the core return.

Last edited by ChasR; 01-30-2013 at 02:49 PM.
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  #59  
Old 01-30-2013, 02:49 PM
GreekboyD GreekboyD is offline
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Thanks for the info. Get on them for the credit man!

P.S. How many miles did you have on your core when you sent it to VAC?

EDIT: Turns out they already sold your core...lol

Last edited by GreekboyD; 01-30-2013 at 03:32 PM.
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  #60  
Old 01-30-2013, 03:32 PM
ChasR ChasR is offline
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50K. I figure that is about 17% of the expected life of a BMW rear end, based on my old cars. Actually, I've never had one go bad on the street or track.
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  #61  
Old 01-30-2013, 05:53 PM
GreekboyD GreekboyD is offline
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Quote:
Originally Posted by ChasR View Post
50K. I figure that is about 17% of the expected life of a BMW rear end, based on my old cars. Actually, I've never had one go bad on the street or track.
Interesting. I only have 18,000 miles on mine. Hopefully I get a good quality core back from VAC. Mike from VAC says he's tracked one down so it looks like I'll be getting a Quaife soon enough.
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  #62  
Old 01-31-2013, 02:40 PM
BB_cuda's Avatar
BB_cuda BB_cuda is offline
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Sounds like we need to get in line for Greekboy's diff. Just yankin your chain. No LSD for me at this time
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  #63  
Old 01-31-2013, 06:25 PM
GreekboyD GreekboyD is offline
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Quote:
Originally Posted by BB_cuda View Post
Sounds like we need to get in line for Greekboy's diff. Just yankin your chain. No LSD for me at this time
lol...when you looking to get one?
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  #64  
Old 11-01-2014, 08:21 AM
GreekboyD GreekboyD is offline
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Mine arrived from VAC last Tuesday and installed it yesterday:

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  #65  
Old 11-01-2014, 01:57 PM
DaveN007 DaveN007 is offline
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Mein Auto: 2011 335d M-Sport
Interesting thread.

A coupe of thoughts based upon my Quaife TBD experience with Porsches.

1) TBDs (Torque Biasing Differential) and LSDs (Limited Slip Differential) are not the same thing and you should not use the terms interchangeably. There are advantages to both.

2) the installation of the TBD can be done in one of two ways. The CORRECT way makes sure that the backlash is set correctly. I don't know if a BMW is fundamentally different, but with a Porsche the shortcut method of "remove old one, shim and install new one" leads to big problems down the line.

3) The electronic systems in the car detect wheel spin (among other things). A Torque Biasing Differential mechanically transfers power to the ground in a way that raises the threshhold before you would get a single wheel spinning...which avoids the electro-nannies and yields better results. The electronics are only aware that the wheels are not spinning.

4)The real benefit is around corners, not in a straight line. You may avoid wheel slip for a moment, but eventually all of that torque makes BOTH wheel spin and the nannies will kick in. It can help under braking in a straight line under some circumstances as well.
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Last edited by DaveN007; 11-01-2014 at 02:02 PM.
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  #66  
Old 11-01-2014, 06:40 PM
GreekboyD GreekboyD is offline
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Mein Auto: 2009 BMW 335d
Quote:
Originally Posted by DaveN007 View Post
Interesting thread.

A coupe of thoughts based upon my Quaife TBD experience with Porsches.

1) TBDs (Torque Biasing Differential) and LSDs (Limited Slip Differential) are not the same thing and you should not use the terms interchangeably. There are advantages to both.

2) the installation of the TBD can be done in one of two ways. The CORRECT way makes sure that the backlash is set correctly. I don't know if a BMW is fundamentally different, but with a Porsche the shortcut method of "remove old one, shim and install new one" leads to big problems down the line.

3) The electronic systems in the car detect wheel spin (among other things). A Torque Biasing Differential mechanically transfers power to the ground in a way that raises the threshhold before you would get a single wheel spinning...which avoids the electro-nannies and yields better results. The electronics are only aware that the wheels are not spinning.

4)The real benefit is around corners, not in a straight line. You may avoid wheel slip for a moment, but eventually all of that torque makes BOTH wheel spin and the nannies will kick in. It can help under braking in a straight line under some circumstances as well.

All great points Dave. As for point #2, here is how VAC Motorsports does it:

Link
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  #67  
Old 11-03-2014, 03:18 PM
ChasR ChasR is offline
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Mein Auto: 335d, E28 M5, Clubman S
My experience with the BMW nannies is that in DSC some wheel spin is allowed as long as both rear wheels are spinning before power is reduced. In Traction Control (DSC off), more wheel spin is allowed before the power gets cut. I believe the BMW DSC protocol is if one wheel spins, cut the power. Of course the TBD eliminates one wheel spinning. BMW Traction control protocol is if one wheel spins, invoke the virtual LSD, if rear wheels speed exceeds front wheel speed by a certain percentage, then cut power. In a straight line, effect of the quaife is being able to almost always get a good launch (within reason) at the default setting of DSC on.
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2011 Saphire Black 335d Sport, Quaife TBD, Evolve Tune, M3 front control arms and bushings, Apex Arc-8 wheels 18 x 9 F, 18 x 9.5 R w 255/265 35 PSS.

Last edited by ChasR; 11-03-2014 at 03:19 PM.
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