Ordered Quaife today
 

I finally got tired of DSC interrupting my spirited accelerations and ordered a Quaife from VAC motorsports. THe one on my old race car was/is fantastic, so I'm looking forward putting the d's power to the ground with a real TBD. Next up is Evolve ECU reprogramming. I'm waiting on that due to the BMW recall to reprogram the ECU. No point getting it and having it wiped almost immediately.

PLEASE keep us posted on your progress! This will be an interesting read, for sure! :)

Who will do your install?

Now that is some COJONES my friend. Another ****** in the crowd like a FEW of us to make changes w/o worrying about the wartanty, keep us posted ok

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I have the ability to change it myself, a shop, a lift and the tools, but I also have a friend in the indy BMW repair business that I trade computer work for car work. I'll have to figure out which way I go. Warranty expired today, BTW. I've swapped the chunk on a e28 and an e46 and it wasn't too difficult.

Awesome stuff. I'm looking to get mine in the spring.

Bravo ZULU amigo ChasR go for it

Jealous. Thats not fare deal. I wish I had friends like that. I help so many people with computer work but in return I cant expect anyone with Car work coz I help them in that too with little I know :(

@bimmerdiesel C'est la vie mon ami

x2. I've been flirting with VAC over the last year about doing the very same thing.

I'd be interested in doing the same come spring time. Please keep us posted.

Quaife TBD shipped today.

Damn... I want that too. I said I will not add any mods to my d till I get LSD. I will talk to VAC again and plan trip to PA for install.

Did you decide on DIY or your buddy?

Let us know how it performs.

Took it to the shop today. Hopefully it will be back tomorrow.

Car is back. Quaife works quite well. I can pull out in front of folks without DSC killing the engine. It seems DSC will allow a little wheelspin as long as both are spinning. I haven't tried it with DTC, but can't imagine it would be an different. THe car has a lot more traction in DSC mode in any event.

You should take it out to the track next!
What was the total bill if you don't mind sharing?

$338 to install + the cost from VAC, $2575 + shipping

Come on tax refund.........:angel:

SHipping BTW was $98 from VAC (UPS) and $68 (FedEx) to ship the core back.

Here's my seat of the pants take on how the Quaife improves the driving experience.

On dry pavement with DSC fully on, ANY wheelspin led to an abrupt cut of engine power. I believe this is because in DSC the brakes aren't used to create a pseudo LSD. I can't prove this and can't find it in the literature. With the quaife it is harder to spin a wheel, so DSC throttle intervention is raised. It will still happen if you light the tires up. DSC allows some wheelspin as long as both rear tires are spinning at the same speed and aren't spinning much faster than the fronts. THis is why I believe the LSD function of DTC is off in DSC.

I still haven't driven the car in DTC mode, primarily because there isn't a need to. Before the quaife, if I was going to accelerate hard, I enabled DTC to avoid DSC throttle intervention.

Thanks for your input ChasR, it is greatly appreciated.
It seems like BMW should have put this thing on from the factory! I could see not in the 335i if they didn't want to steal M sales, but the d seems to really need this even with my 265 wide rear tires. I can't imagine how bad traction is on the non sports with 225s!

It's fine actually ...

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I guess it depends on your right foot!
I've noticed sometimes when I get on it to pass someone the car nearly goes sideways with DSC intervening to correct and this is at 40+mph.

Quaife LSD
 

I am planning to have the Quaife LSD installed by VAC as soon as I can contact them and schedule. At the same time I will have them install M3 Rear Subframe Bushings and M3 Rear Sway Bar. Still considering the H&E Rear Sway instead, but kinda want to stick with mostly BMW parts.