[Mr. 5]

Originally Posted by HP Autowerks

Parts:

Wavetrac $1295
Axle seals $35
Gear Lube $20
Misc chemicals $?

Labor:

Autotech to modify your welded ring gear $700

Your tech to install the unit 3-4 labor hours


Buy one complete... $1995 + $800(Refundable core charge) + Freight

Thanks for chiming in Harold!
Don't you already have a couple units ready to go at your shop?

[HP Autosport]

Originally Posted by Mr. 5

Thanks for chiming in Harold!
Don't you already have a couple units ready to go at your shop?

Yes, i do. Both in 3.08 and 3.46 ratios.

[scottp999]

Originally Posted by Mr. 5

Let's face it...
Installation
Thankfully, I had a shop near me do the install. Unitrax is a company that strictly deals with drivelines and they’ve been doing it for 25 years. They worked with installing the ring gear, setting up the backlash, and replacing the seals. I’ve never seen so many differentials in one place in all my life. http://www.gounitrax.com/

Question - So if you buy the whole unit and don't have to mess with any internals, you basically:

1) Remove the rear part of your exhaust and heat shields.
2) Lower the rear driveshaft - Edit - Need 55mm open end wrench for driveshaft nut.
3) Remove the diff which requires removing the diff bolts, vent line, and using BMW special tool 33 4 420 (to lower and raise it)
4) Reverse above and fill with diff fluid?

Bentley Service Manual has all the correct torque specifications.

[uberschnell]

Lets face it, the open diff has been the biggest thing holding the 335 back from being a true all-around performance monster.

[Slidewayz]

Um, shouldn't there be a -$700 somewhere there if we have a bolted diff?

Originally Posted by HP Autowerks

Parts:

Wavetrac $1295
Axle seals $35
Gear Lube $20
Misc chemicals $?

Labor:

Autotech to modify your welded ring gear $700

Your tech to install the unit 3-4 labor hours


Buy one complete... $1995 + $800(Refundable core charge) + Freight

[Nick@aep]

Very good to hear! This gives me and my welded ring gear some hope. Good write up, as usual, Craig.

[Sniz]

Mr 5

love that vid, right at the end you can see you put your head down most likely muttering "SH*T"

loved it, funny


that looks like a huge upgrade for your 335....well done!

enjoy it.

[Mr. 5]

Originally Posted by scottp999

Question - So if you buy the whole unit and don't have to mess with any internals, you basically:

1) Remove the rear part of your exhaust and heat shields.
2) Lower the rear driveshaft - Edit - Need 55mm open end wrench for driveshaft nut.
3) Remove the diff which requires removing the diff bolts, vent line, and using BMW special tool 33 4 420 (to lower and raise it)
4) Reverse above and fill with diff fluid?

Bentley Service Manual has all the correct torque specifications.

Yep. That's the best thing about getting a unit that's already built.

Originally Posted by Sniz

Mr 5

love that vid, right at the end you can see you put your head down most likely muttering "SH*T"

loved it, funny


that looks like a huge upgrade for your 335....well done!

enjoy it.

haha! Yah, when I put my head down, I just knew to hold on and pray to not hit a wall.

[Mr. 5]

Originally Posted by Slidewayz

Um, shouldn't there be a -$700 somewhere there if we have a bolted diff?

Yes, unless you want a complete unit.

[Hit_Apex]

Cool stuff. We should get together and put the 3.46 / 3.08 thing to a test. Either way, the biggest gains are from the LSD - nice to have different options on the market. Any gear noise on decel? What fluid are you running?

[ptwob311]

Mr. 5 great write up. seems all your post are very worthwhile reads...

dumb question for us AT guys with the 3.46
I know the LSD is the true gain in this situation BUT, wouldn't you possibly see better fuel economy at highway speeds with the 3.08? Or with the AT would that put you too low in the RPMs and bog the engine? Currently at 75 MPH i run about 1800RPM or there-abouts. just curious what a different final drive ratio would yield.

[scheherazade]

Originally Posted by Sparky66

I guess many here have seen this video of how an LSD performs on wet road surface.

Guys, enjoy your LSD's ........

That happens to be a clutch type LSD.
Locks on input shaft torque.
(As opposed to the diff velocity actuated clutch types).
It lets you get a 100% lock left/right and matched wheel speed - perfect for drifting.
It's not a quaife (although I'm sure a quaife would do ok at this).

-scheherazade

[cstavaru]

Interesting.

But I read that someone from this forum installed a Wavetrac and there was a thumping noise in the differential happening in some conditions like decelerating and getting on the gas again. Did you notice this ?

To be honest, I would go with Quaife because they have a history and Wavetrac is relatively new on the market.

But as I have a welded ring and a manual gearbox, I will probably buy some Bridgestone RE-11 wide tires and hope for the best (traction)

[Sparky66]

Originally Posted by scheherazade

That happens to be a clutch type LSD.
Locks on input shaft torque.
(As opposed to the diff velocity actuated clutch types).
It lets you get a 100% lock left/right and matched wheel speed - perfect for drifting.
It's not a quaife (although I'm sure a quaife would do ok at this).

-scheherazade

Where do you get your source from ??
I spoke in depth with Kevin Bird from Birds UK and he directed me to this video of the Quaife unit he fitted at his Heathrow workshop. It's mentioned by Chris in the video and the link is even directed from Birds internet site. He supplies and fits these units for Hartge and I even have full write up review of this very car and the Quaife unit they fitted to it.
I took the plunge with this unit when Shiv posted up a video on this site a long while back of his car fitted with the Quaife doing controlled drifts at an old airport hangar. So yes it can drift and quite well.

[Former_Boosted_IS]

Mr. 5, superb write up and great initiative to get this done where the rest of the members can enjoy the work you put in!

[scheherazade]

Originally Posted by Sparky66

Where do you get your source from ??
I spoke in depth with Kevin Bird from Birds UK and he directed me to this video of the Quaife unit he fitted at his Heathrow workshop. It's mentioned by Chris in the video and the link is even directed from Birds internet site. He supplies and fits these units for Hartge and I even have full write up review of this very car and the Quaife unit they fitted to it.
I took the plunge with this unit when Shiv posted up a video on this site a long while back of his car fitted with the Quaife doing controlled drifts at an old airport hangar. So yes it can drift and quite well.

They say it's a "hartge" LSD.

Here's a hartge LSD :

http://www.firebladeautomotive.com/s...e1d0c0ec7e.jpg

http://www.firebladeautomotive.com/s...mart&Itemid=26

You can see two of the internal-sprocket-axles-of-rotation along the center of the body, in the casing gaps.

That shows that it's an (1/1.5/2)-way locker, not a torsen (aka torque sensing, like a quaife would be).

Also, when you see 0-100% on an lsd description, it's *usually* a clutch pack locker that works on input torque.

The clutch types that work on differential left/right wheel spin speed, they will usually be <0% or more (often more)> up to <less than 100%>. However they only engage more when wheels are spinning differently, not when you accelerate/decelerate.

0-100% lockers are the kind of LSD you'll see on a dedicated drift car.
By the time you're X% into your power band, the wheels can be frozen together. Which makes drifting much more predictable.

-scheherazade

[Malaka1]

So it is $1995 for a differential with the wavetrac lsd, and then I can send my welded diff in for an $800 core fee? Sounds good..

[scottp999]

Originally Posted by Malaka1

So it is $1995 for a differential with the wavetrac lsd, and then I can send my welded diff in for an $800 core fee? Sounds good..

No. You pay $2795 up front (plus shipping). When you remove your diff and send it back to them you get the $800 back.

[Malaka1]

Originally Posted by scottp999

No. You pay $2795 up front (plus shipping). When you remove your diff and send it back to them you get the $800 back.

Ok, still not a bad price compared to the other options..

[Mr. 5]

Originally Posted by Hit_Apex

Cool stuff. We should get together and put the 3.46 / 3.08 thing to a test. Either way, the biggest gains are from the LSD - nice to have different options on the market. Any gear noise on decel? What fluid are you running?

I'm all for it, but just to let you know, I ran another member with an MT and 3.46 and I was quicker. We both had the JB3 and were on the same maps. I even had my stock exhaust on then.
The only thing that I noticed was that he shifted before me.

Originally Posted by ptwob311

Mr. 5 great write up. seems all your post are very worthwhile reads...

dumb question for us AT guys with the 3.46
I know the LSD is the true gain in this situation BUT, wouldn't you possibly see better fuel economy at highway speeds with the 3.08? Or with the AT would that put you too low in the RPMs and bog the engine? Currently at 75 MPH i run about 1800RPM or there-abouts. just curious what a different final drive ratio would yield.

For AT guys, there really is no second option for you because putting a 3.08 in the rear is going to put your acceleration to a standstill.
BUT, you would benefit greatly if you wanted to go for the overall fastest 335i. With that type of gearing, you could probably get past the 200 mph barrier.

Originally Posted by cstavaru

Interesting.

But I read that someone from this forum installed a Wavetrac and there was a thumping noise in the differential happening in some conditions like decelerating and getting on the gas again. Did you notice this ?

To be honest, I would go with Quaife because they have a history and Wavetrac is relatively new on the market.

But as I have a welded ring and a manual gearbox, I will probably buy some Bridgestone RE-11 wide tires and hope for the best (traction)

Could you post the link please because I didn't hear of this.
To be honest, when I first had this installed, I was nervous because I heard a grinding noise in the rear. When I got home, I jacked up my car and found that the heat shield was rubbing against the drive shaft.
I'm telling you, there is no audible difference between this LSD installed and the OEM diff.

[boom]

I'm very seriously considering this. Can you tell me how the pumpkin removal/install went with your car? Or, if you had it done, what was the charge?

[Mr. 5]

Originally Posted by boom

I'm very seriously considering this. Can you tell me how the pumpkin removal/install went with your car? Or, if you had it done, what was the charge?

It takes about a couple hours because the exhaust needs to come off before the pumpkin install.
It's really not bad at all.