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      11-09-2014, 05:23 PM   #89
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Quote:
Originally Posted by NRBRNG
Quote:
Originally Posted by driftflo View Post
depends on the usecase of the car? concerning performance reasons i would go with a 3.62 final drive and a properly configured clutch-type LSD. of course i think my custom unit and setup is the best (this is why i do set it up like this) but it also depends on individual driver preferences on how the car should react and handle.
100% agree. 3.62 in DTC is extremely rapid on track. Driftlow offers great advice and his custom option looks really great. He was really helpful in guidance for me. In the end I went with a more local (and therefore serviceable/ customizable ) option for my local shop guy with a Diffsonline 3.62 triple ramp. No issues with topping out of revs and you certainly bash thru the gears quickly. Mid corner and exit speeds onto straights is night and day difference. Definitely not a sensible option on a street driven car IMHO (noise, whines). Solid bushings is a must.
Thanks again Driftlow for the great community info and product offering!
Is 3.62 final drive appropriate for supercharged cars?
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      11-13-2014, 07:32 AM   #90
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Great info! pleased i didn't waste any money before seeing this!

Sending you a PM over.
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      11-17-2014, 03:23 PM   #91
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Quote:
Originally Posted by okusa View Post
Is 3.62 final drive appropriate for supercharged cars?
depends on the application.
drive it with the stock final drive and decide yourself if it is still too long.
if you have a dct car you need to have the software reprogrammed to have smooth downshifts in auto mode. so also ask your shop what ratios they can programm. in germany i have a good source to get the 3.62 programmed. but no other ratios.
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      12-03-2014, 06:16 PM   #92
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Originally Posted by driftflo View Post
yes i have some m5 e39 units here. they come with only 2 clutchpacks and a 2-way setup which does 25% lockup on both, accel and decel.
and it has pretty much preload.

i developed a rebuild kit that fits plug and play with the double amount of clutches. so it locks 45% in both directions. clutches are higher quality than standard, too. if you want preload and/or even more lockup you need some exchange parts like different pressure rings, modified topcaps...
so the basic unit itself is a great basis but it comes as standard with a pretty low locking setup and wears out quickly.
I've got an e39 m5.. mostly street use & aggressive backroad driving -- track day 1-2 times per year. What would you suggest for this type of driving? (i'm sure at 140K on my odo that my diff is shot-- any quick test?)
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      12-03-2014, 07:37 PM   #93
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Quote:
Originally Posted by jlcool007 View Post
I've got an e39 m5.. mostly street use & aggressive backroad driving -- track day 1-2 times per year. What would you suggest for this type of driving? (i'm sure at 140K on my odo that my diff is shot-- any quick test?)
The easiest test is to see if you have inside tire spin accelerating hard in 2nd gear around a tight corner. My M5 LSD discs were shot by ~50k miles but that included many autox launches on R-comps, track days, etc. Simply powering out of a 2nd gear turn would burn the inside rear tire just like an open diff. DSC off of course.
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      12-04-2014, 03:36 AM   #94
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after 140k miles you dont need to test it, it is worn for sure.
for an experienced driver the 2nd gear tight corner test mentioned from csbm5 is an option. but at this mileage it definitely makes sense to put in a new set of clutches to bring the unit back to life!
for your application i would suggest to go to 45% lockup via the double amount of clutchpacks. and i would reduce the preload but not doing completely without it.
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      12-07-2014, 06:59 AM   #95
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Hey driftlo,

Thank you for sharing your knowledge!

Did you perform any LSD tests in slippy conditions? Any suggestions how to set up draxler gt4 unit to improve traction in wet/snow/ice?

I'm quite happy with my draxler gt4 unit on dry track but now the dry tarmac season is over, this week I first tried to track my M3 in snow/ice conditions which I'm gonna do regular for the next few months, so I thought of possible LSD set up change. In particular looking for improved out of corner acceleration and ability to sustain stable slide angle through long turns.

And one more thing, once you've mentioned that draxler gt4 units needs to be rebuild regularly, can you please specify what did you mean by this

Many thanks
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      12-07-2014, 03:19 PM   #96
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dear simons,

yes i did test on slippy conditions a lot.

if you want to be fast in snow/ice conditions you need to reconfigure the lsd indeed! the current setup is or will be fun but not fast ;-)

the lockup should be reduced, some preload could be added.
where from europe are you from? if you want i can reconfigure it to your specific needs.

drexler says it should be rebuilt at least after a whole racing season. i would say it will last 50-80 hours of trackdriving (if you want to win races rebuild it after 50h... if you want to "just" drive damn fast 80 will also be ok) with very few performance dropdown.
after that it still locks but performance and laptimes will go down and predictability also gets worse (sometimes it locks, sometimes it spins).
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      12-08-2014, 04:22 PM   #97
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Quote:
Originally Posted by driftflo View Post
after 140k miles you dont need to test it, it is worn for sure.
for an experienced driver the 2nd gear tight corner test mentioned from csbm5 is an option. but at this mileage it definitely makes sense to put in a new set of clutches to bring the unit back to life!
for your application i would suggest to go to 45% lockup via the double amount of clutchpacks. and i would reduce the preload but not doing completely without it.
Similar here with M5 e39, and at 2nd gear wheel spin , so the diff is worn .
For sure I want to go to higher % lockup than stock . 45% is enough for street drifting ? Why would you suggest to reduce the preload ?
Thank you .
How can we find out cost for the above for Greece ?
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      12-10-2014, 11:09 AM   #98
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yes, 45% lockup is enough for your purpose. you dont need so much preload if you have the double amount of clutches. more clutches mean it reacts and engages better anyway. no need to use the high amount of preload that is required to get a stock 2 clutchpack setup to work.
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      01-13-2015, 03:57 PM   #99
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Quote:
Originally Posted by driftflo View Post
yes i have some m5 e39 units here. they come with only 2 clutchpacks and a 2-way setup which does 25% lockup on both, accel and decel.
and it has pretty much preload.

i developed a rebuild kit that fits plug and play with the double amount of clutches. so it locks 45% in both directions. clutches are higher quality than standard, too. if you want preload and/or even more lockup you need some exchange parts like different pressure rings, modified topcaps...
so the basic unit itself is a great basis but it comes as standard with a pretty low locking setup and wears out quickly.
Where can we check out that rebuild kit?
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      01-13-2015, 04:13 PM   #100
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Winter driving exposed the short comings of the oem diff. Mainly when I lift of the throttle, it sometimes slips because it's an overrev condition, and the diff is a one way diff. I noticed that wavetrac makes an LSD for the E9X M3. Wondering if anyone has tried to buy and install?
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      01-13-2015, 04:20 PM   #101
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Interested in the E39 M5 LSD option for my e46 track car to save some money.
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      01-13-2015, 05:42 PM   #102
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Quote:
Originally Posted by tikamak View Post
Where can we check out that rebuild kit?
you can get/buy it from me if you want to.
all parts are in stock.

Quote:
Originally Posted by Killerfish2012 View Post
Winter driving exposed the short comings of the oem diff. Mainly when I lift of the throttle, it sometimes slips because it's an overrev condition, and the diff is a one way diff. I noticed that wavetrac makes an LSD for the E9X M3. Wondering if anyone has tried to buy and install?
wavetrac (as any other torsen) also only locks on power! if you lift off the throttle it is open.
i installed some wavetracs on customers request (mostly if there is no clutch lsd option available for a certain application or if the car is a daily driver and they don't want to "feel" a lsd). i had no complains so far.
but i definitely would go the 2-way clutch type lsd route on a M3!

Quote:
Originally Posted by 1MOREMOD View Post
Interested in the E39 M5 LSD option for my e46 track car to save some money.
np! i have two options on offer: a complete, freshly rebuilt lsd core with 45% setup or only the required new internal parts to upgrade an existing M5 E39 core to 45% with new clutches.
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      01-13-2015, 05:45 PM   #103
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What does a 4 clutch e39 m5 lsd run? Not really sure what I'm looking for. Considering complete diffsonline unit next season possibly.
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      01-13-2015, 08:51 PM   #104
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I've seen a clutch kit where you just stuff 2 more clutch plates in each side of an E39M5 diff. So it's that easy to upgrade that unit?
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      01-13-2015, 10:33 PM   #105
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Quote:
Originally Posted by driftflo View Post
wavetrac (as any other torsen) also only locks on power! if you lift off the throttle it is open.
i installed some wavetracs on customers request (mostly if there is no clutch lsd option available for a certain application or if the car is a daily driver and they don't want to "feel" a lsd). i had no complains so far.
but i definitely would go the 2-way clutch type lsd route on a M3!
Are you thinking of quaife's LSD? That torsen LSD does not lock off power and is a 1 way diff. Wavetrac Locks off power! Please do some research. Wavetrac is a two way diff. Read (Click on: how it's different):

http://www.wavetrac.net/technical.htm

Quote:
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      01-14-2015, 04:24 AM   #106
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Quote:
Originally Posted by Killerfish2012 View Post
Are you thinking of quaife's LSD? That torsen LSD does not lock off power and is a 1 way diff. Wavetrac Locks off power! Please do some research. Wavetrac is a two way diff. Read (Click on: how it's different):

http://www.wavetrac.net/technical.htm

Quote:

i am thinking of gear differentials that provide torque biasing. there are actually no gear "lsd" units.

wavetrac is a gear differential that additionally provides some preload and corresponding a little biasing on coast. i discussed that with dana clark (you should know who he is if you are into wavetrac) in detail. so i dont think i need to do more research on that one!

as i said, these units are quite ok. if you think it is the right one for you and it has enough biasing capacity on coast, get it!

i generally don't like gear type units that much because they are not able to lock up the axle at all. it is no locking but a biasing differential. it feels pretty different. so speaking of "lock" concerning a wavetrac is wrong. just do some research on that or ask dana directly ;-)

a 335i also feels different from a M3. two worlds...
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      01-14-2015, 04:41 AM   #107
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Quote:
Originally Posted by bigjae1976 View Post
I've seen a clutch kit where you just stuff 2 more clutch plates in each side of an E39M5 diff. So it's that easy to upgrade that unit?
depends on the exact setup you want/need.
there is not enough space to just put in two more stock clutchpacks.
so you need to have a clutchpack with special, thinner but more durable clutchdiscs. and if you want a belleville spring fitted as well, you need to get some parts machined (or get the machined parts from me as well).

if someone orders such a kit i will ask him what he wants to do with the car and then i send the according parts that he will need to build a setup that fits his needs.
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      01-14-2015, 10:12 AM   #108
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Quote:
Originally Posted by driftflo
Quote:
Originally Posted by bigjae1976 View Post
I've seen a clutch kit where you just stuff 2 more clutch plates in each side of an E39M5 diff. So it's that easy to upgrade that unit?
depends on the exact setup you want/need.
there is not enough space to just put in two more stock clutchpacks.
so you need to have a clutchpack with special, thinner but more durable clutchdiscs. and if you want a belleville spring fitted as well, you need to get some parts machined (or get the machined parts from me as well).

if someone orders such a kit i will ask him what he wants to do with the car and then i send the according parts that he will need to build a setup that fits his needs.
Looks like the kit I'm referring to has thinner clutches and lock plates as they advertise zero machine work is necessary. They also say it was designed for zero preload.

So what is the design of the E46 M3 diff? Is it a 2 plate clutch like the E39 M5?
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      01-14-2015, 11:03 AM   #109
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Quote:
Originally Posted by bigjae1976 View Post
Looks like the kit I'm referring to has thinner clutches and lock plates as they advertise zero machine work is necessary. They also say it was designed for zero preload.

So what is the design of the E46 M3 diff? Is it a 2 plate clutch like the E39 M5?
Let me know what you find out. I'm shopping for new diff next fall or parts to do mine.
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      01-14-2015, 11:09 AM   #110
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Quote:
Originally Posted by 1MOREMOD
Quote:
Originally Posted by bigjae1976 View Post
Looks like the kit I'm referring to has thinner clutches and lock plates as they advertise zero machine work is necessary. They also say it was designed for zero preload.

So what is the design of the E46 M3 diff? Is it a 2 plate clutch like the E39 M5?
Let me know what you find out. I'm shopping for new diff next fall or parts to do mine.
I might give them a call...
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