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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > My VAC Motorsports Quaife LSD review - DCT 335is!



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      04-22-2013, 02:15 PM   #1
ashmostro
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My VAC Motorsports Quaife LSD review - DCT 335is!

Before I begin, I need to say that it took too long for me to post this up, but my excuse is that I've been travelling pretty much every week for work. The LSD was installed on the 16th of March, and I've had some good time to assess its added performance and benefit.

Some background on my car and plans for it:
As she sits now, her relevant mods are
- Michelin Pilot Supersport non-RFT's in 245/275 fitment (on stock 19's)
- JB4 G5 on map 5
- ETS 5" FMIC (also installed by VAC on the same day!)
- AFE Stage 2 intake with Pro Dry filters and scoops

I will be doing some major suspension enhancements over the months and year, including M3 or Powerflex subframe bushings (not yet decided), Ground Control street/school coilovers, and then I'll decide after all that if I want M3 front control arms and sway bars. I want the coils first to assess the new weak spots.

Install:
Gotta give solid PROPS to Mike Malloy and his master tech Klevis who were both champions for me in their own rights. Mike is eminently fair and honest, and is available to talk even though he's incredibly busy. He worked around my schedule to stay open on a Saturday for this job to get done, since I live in the DC metro and they are obviously up in Philly. 2 hour drive for me.

Klev truly is a master tech, but more impressively he is really open to questions, peeking and prodding while he works. Most techs would NOT be ok with that, but I wanted to learn and he was a great teacher. He's also a fountain of information and since I value the opinion of experienced folk, I was drinking from it! Klev finished off the day by also installing the ETS 5" FMIC that I ordered from VAC. Killer guy.

Results:
Ok well I should probably start with how my car behaved before the LSD. I remember one day in particular, which ironically was the first day I visited VAC to check out their site. I was leaving Philly with my fiancee and we were merging onto a fast moving fwy from a dead stop. Obviously I *had* to use throttle liberally, for like, safety n stuff. Well, the results pretty much sucked- the car bounced off traction control violently due to massive loss of grip and we were going in a perfectly straight line. First gear was unusable. Up until then, I had not gone more than 1/2 throttle in first gear on my new car.

Once the LSD was installed, this effect pretty much went away. I can still lose traction, but it's both wheels that put down the lines and I won't bounce off the traction control (if I remember to put on DSC). What's way more impressive though- and is the sole reason I got the LSD- is how she behaves in a turn. I used to feel like anything more than pansy-ass application of throttle in a turn resulted in inside wheel jacking and hopping, and it was anything other than a sporty feeling. Now, not only does the power get put down, but I actually feel the torque biasing working the more throttle I use. It feels almost as active as torque vectoring, which I know it is not. Still though, now the car feels as though the outside rear wheel is pushing it around the corner and I get a hint of rotation- not oversteer- that makes it a joy to carve any road with aplomb.

I can't wait to get the rest of my handling mods going, but it will take time to save up the money for it after this work. Oh, I should also add that mine with the first 335is DCT that Mike and co did. Mike was great in identifying the best possible solution for me financially and sourced my a fresh pumpkin from Germany in about a week. He was very cool about the core charge and just made the whole thing easy as pie.

Thanks Mike and Klev for your professionalism, and for some solid work quality. It's a far cry from the typical customer service one gets these days from pretty much any other outfit.

Everyone else that is on the fence about an LSD- GET ONE. It's a mod any car yearns for, high or low horsepower. It just transforms the handling.

Various pics of my car, cool things in the shop, and one very very stunning M3. Lots of track cars just sitting around like it's no big!











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      04-22-2013, 04:50 PM   #2
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Great review, thanks for sharing.
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      04-22-2013, 07:37 PM   #3
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Thanks! Hope it helps someone on the fence in their decision.
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      04-22-2013, 07:46 PM   #4
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VAC seems to be the bees knees. I'm sitting on three grand just waiting on a good reason for me to pull the trigger on one of these. This review didn't help keeping that money safe....
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      04-22-2013, 07:47 PM   #5
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Do eeeet! Which diff are you leaning towards?
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      05-16-2013, 07:37 PM   #6
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I too am close to pulling the trigger. I spoke with Mike a few times and he is a great guy. Hope to have the Quaife LSD for my automatic installed in the next month or two.

Thanks for posting!
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      05-16-2013, 10:02 PM   #7
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Well well, this was one of the things on my things to do list
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      05-16-2013, 10:03 PM   #8
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With all the drag racing you do, are you leaning more towards a clutch type or even wavetrac?
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      02-16-2020, 06:33 PM   #9
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I'm searching for more info on going LSD. I know this is an old post but do you have any info on gear ratio?
Has the swap caused any problems?
Quaife on VAC says it fits 335i and doesnt specify 335is so kinda curious.
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      02-16-2020, 07:11 PM   #10
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It's been years since I owned that car but I think I can still help with an answer of sorts.

The quaife never gave me any issues. It was rock solid and worth every penny.

As for 335 vs 'is, the only difference AFAIK was the ring gear to have the right final drive ratio (I think the unique final drive applies to DCT only but dont quote me on that). Any shop that knows what its doing will account for this with the right donor ring gear (either machine your own or you pay for a core).
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      02-18-2020, 07:19 PM   #11
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I am in the middle of doing a dif swap to LSD as well. Did you use the stock diff bushings or change them to something stiffer?

Thanks
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      02-18-2020, 07:26 PM   #12
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IIRC I did purple poly bushings from polyflex. Subframe went with M3.
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      02-18-2020, 08:22 PM   #13
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Quote:
Originally Posted by ashmostro View Post
IIRC I did purple poly bushings from polyflex. Subframe went with M3.
How hard were the sub frame bushings?

I was thinking I may leave them stock since I don't have things torn apart that far and just upgrade the dif bushings. I wonder if that is a bad plan.
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      02-18-2020, 08:53 PM   #14
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Subframe bushings transformed the handling and power-on stability and rear end tracking of the car. Imo it's a must do if you're doing anything other than Street driving.

The diff bushings did lead to very slight whine at freeway speeds but I got used to it pretty fast.
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      02-23-2020, 08:31 AM   #15
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Quote:
Originally Posted by smithder View Post
How hard were the sub frame bushings?

I was thinking I may leave them stock since I don't have things torn apart that far and just upgrade the dif bushings. I wonder if that is a bad plan.
No don’t do that. If you do the only the diff bushings, the vibration will transfer to the subframe bushings and wear them prematurely.

The rule is to use the same material for both your subframe AND diff bushings.

I have aluminum subframe and diff bushings and have no regrets. My stock F80 has a harsher ride compared to my 335is with upgraded aluminum bushings everywhere lol
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