[GreekboyD]

I know the open differential is welded on for our 335d vehicles. Is it possible to take an existing Quaife LSD on a 335i and put it on our 335d or are both LSD units for either model built differently?

Thanks.

[Puerto Rican 335d]

Great question Greek I know how BADLYY you wanta quaife!! LOL

[GreekboyD]

Haha, yes amigo. I have a guy ready to possibly sell me his as he's parting out his car. Just want to ensure that this swap is possible before going ahead with it.

[Puerto Rican 335d]

best way is to call Lenny at RENNtech and he will confer with Matt from Active Works to see if the transfer can be done, BTW good luck on this!!!

[DieselDiner]

Hey GBD, maybe I should check it on my car first...what's the guy's name and number?

[minus13]

Your problem will be that you will have a significantly higher gear ratio if you swap from a 335i to a 335d. I suppose you could still use every other part of the LSD other than the gear ring, but if you wish to swap out your existing gear ring into the transplant 335i Quaife LSD, you still have to separate the welded ring from your current 335d open differential.

In short, you can't just swap a 335i LSD into your 335d without significantly affecting final drive ratio.

[minus13]

Final drive ratios:

335d - 2.81
335i - 3.46

Don't try a 3.46 ring in your 335d. If you think 1st gear is short now, it will be practically useless with a 3.46 ring. Also, I am fairly sure that shift points will not be optimal unless very specific reprogramming is performed.

[GreekboyD]

Lol @ DD and thanks minus. I was thinking about the gear ratio aspect too.

[DieselDiner]

GBD, I wrote this on the other board, do you think it would be worthwhile to contact Quaife directly? They're in the UK, so there's still time before they are done for the day.

[minus13]

Originally Posted by DieselDiner

GBD, I wrote this on the other board, do you think it would be worthwhile to contact Quaife directly? They're in the UK, so there's still time before they are done for the day.

I know you're not addressing me, but why do want to contact Quaife directly? You can call HP Autowerks directly. They are in the US. They can set you up from start to finish. They can answer your questions, too.

Or you can take the advice of another forum member who has already considered changing the final drive ratio (to a lower ratio to make better use of first gear and have a longer gear at highway speed) and considered all of the problems. *cough*

[DieselDiner]

Originally Posted by minus13

I know you're not addressing me, but why do want to contact Quaife directly? You can call HP Autowerks directly. They are in the US. They can set you up from start to finish. They can answer your questions, too.

Or you can take the advice of another forum member who has already considered changing the final drive ratio (to a lower ratio to make better use of first gear and have a longer gear at highway speed) and considered all of the problems. *cough*

No offense intended, just trying to be helpful to a fellow der. Your plan and comments are much better, however!

[GreekboyD]

Thanks guys. Harold from HP Autowerks sent me this:

No, those two models don't share the same Quaife unit.

Harold
***************

[crazyinp]

You might want to get more details. VAC Motorsport have chart that will help you. http://www.vacmotorsports.com/blog/3...no-lsd-really/

Originally Posted by GreekboyD

Thanks guys. Harold from HP Autowerks sent me this:

[Timujin]

Originally Posted by crazyinp

You might want to get more details. VAC Motorsport have chart that will help you. http://www.vacmotorsports.com/blog/3...no-lsd-really/

These guys seem to be the only choice. I swear we need to caravan next spring and lsd up.

[GreekboyD]

Very true dude. I'm getting a Quaife LSD next spring for sure.