M performance LSD

M135iSNO · Jan 20, 2016

Hi all. Am weighing up the option of adding the m performance LSD to my M135i. I've got a good quote from Cotswold including fitting. I did consider the quaife option but don't like the thought of losing the old diff and also the m performance could be swapped out when trading the car in and should get some money back for it. It will also be included in the BMW warranty.

I've contacted the insurance company (Esure) and they tell me it is not classed as a chargeable modification which is great news.

So all is good to go. My question is, to anyone who has one already, does it improve traction in the wet or does esp still light up? Does it make a big difference to the handling? My main reason for getting one is improved traction in the wet and being able to apply a bit more power earlier in the corners. Going sideways may be a consideration in the future if I ever take it to a track day etc. Thanks in advance for your advice.

marco_polo · Jan 20, 2016

I have one, and it now drives how it always should have done. I'm sure it was developed with a Drexler, and then removed by Marketing to save costs or something.

The traction control depends on conditions, it certainly flickers up much less than it used to. Far more controllable in Sports+ / DSC off.

Yes, you can put the power down earlier, but it's more than that. It's better to drive everywhere, all the time.

Blind Pugh · Jan 20, 2016

LSD - even for road use - helps traction of a high powered SWB, RWD car. It just grips and goes.

I was very glad for mine when in mid Wales last weekend - 4 seasons in one day - single track lanes with 2 inches of snow too narrow for a gritting truck. Made worse as I had just sold my winter tyres so on MPSS. Drove to the conditions and the car got up/down some hilly routes wo issue.

M135iSNO · Jan 20, 2016

Ok thanks that's good to know. Could you explain the 30% lockup on acceleration, 9% on deceleration and what that means? Does the m performance perform better than the quaife for road use or are they much the same? Thanks for your help.

marco_polo · Jan 20, 2016

I'm putting out 390ftlb of torque. With a 30% lock, the wheel with least traction should put out 117 ftlb (even with one wheel in the air), verses 0 ftlb with an open diff (where it just spins all the torque away). Most BMW LSD's were 25% historically, 30% is nice.

Quaife are very good too, even higher torque bias, and basically maintenance free. They're only minor downside is they're reactionary, where as the Drexler is pro-active (locking a little earlier - as soon as the torque is applied to the propshaft rather than waiting for a wheel to lose traction).

wrighty1M · Jan 20, 2016

Ok so I have an LSD so wheres best to properly control the rear end via the throttle so to get some proper confidence in the car. We can all do a small drift and a wheelspin but I know very few who can do it properly.
Before you say a car park Im 48 so would look a bit of a tw*t skidding round Morrisons.
Im back on my euro drive in June in the Alps so preparation is needed. Not many tracks in the North offer tuition in your own car.

Mike Roberts · Jan 20, 2016

Drift day at Oulton or similar? I've done the CAT Driver Training skidding like a loon course at Millbrook, that was brilliant and very useful for learning how my car reacts.

marco_polo · Jan 20, 2016

Your local IAM might know where your nearest public skidpan is?

Mike Roberts · Jan 20, 2016

Seems there's a bit in Shropshire

https://www.facebook.com/shropshiredrifting

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Buxton

http://www.buxtonraceway.com/drifting/index.htm

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marco_polo · Jan 20, 2016

How are you finding your MP LSD Mike?

I haven't found any real downsides yet, other than the dollar.

Mike Roberts · Jan 20, 2016

Well, as you know it's a bit rubbish out there at the moment - so in terms of my daily grind:

Jumping out of junctions/roundabouts/etc is no longer is a kangaroo affair of managing the traction, you just hoof it and go.
Instances of snow/ice have been calmly dealt with, having 2WD instead of 1WD (for the most part). I have more grip everywhere.
I love the transition of it helping turn you into a bend, pivoting on the hips, and then that drive out being so satisfying.

Best of all, I like the fact arse angle is dictated by throttle position, and not my having to be 'rough' with weight transition to get it to move and then hold it.

I haven't had it on track yet, but (and I know it's frigging expensive) ...but, I've appreciated it enough already to be happy I spent the cash.

M135iSNO · Jan 20, 2016

Mike Roberts said:
Well, as you know it's a bit rubbish out there at the moment - so in terms of my daily grind:

Jumping out of junctions/roundabouts/etc is no longer is a kangaroo affair of managing the traction, you just hoof it and go.
Instances of snow/ice have been calmly dealt with, having 2WD instead of 1WD (for the most part). I have more grip everywhere.
I love the transition of it helping turn you into a bend, pivoting on the hips, and then that drive out being so satisfying.

Best of all, I like the fact arse angle is dictated by throttle position, and not my having to be 'rough' with weight transition to get it to move and then hold it.

I haven't had it on track yet, but (and I know it's frigging expensive) ...but, I've appreciated it enough already to be happy I spent the cash.

I'm sold!

Mike Roberts · Jan 20, 2016

Oh, I thought of a negative.

It can be a little squirmy with diff lock on a downshift. Ensure your heel&toe has its A game if you're 'on it'... obviously not an issue if you've an auto.

wrighty1M · Jan 20, 2016

Mike Roberts said:
Seems there's a bit in Shropshire
https://www.facebook.com/shropshiredrifting
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Buxton
http://www.buxtonraceway.com/drifting/index.htm
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Looks like the Shropshire one has wrapped up and I have been emailing Buxton for dates
Oulton is a possibility but it's a fairly small track low speed I've been before

Mike Roberts · Jan 20, 2016

It's big/quick enough to learn your craft, as it is so low grip, you have to have very fine control.

That said, I've seen the serious boys attack it with some speed.

jonnydrama · Jan 21, 2016

Darkiedm4 said:
Can only say my car is so much more fun to drive now with the LSD. Worth every penny. And you dont know until you have driven and compared 2 cars side by side.

This was the same with my mini GP, best mod I did by far.

VO_M135i · Jan 21, 2016

How much are we talking for a MP LSD fitted? Opinions on best place to have this done? Many thanks

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marco_polo · Jan 21, 2016

TRL was doing these for about £2450 a while back on his new builds, all in.

Probably worth giving Phil at Cotswolds a try too, they seem very reasonable for fitting most parts.

dogfather · Jan 21, 2016

Think this will be a good price to go with ??????

Dear Mr Sweeney
Please find set out below our quotation for the equipment requested for your approval. We trust that we have not omitted any of the equipment
discussed and hope that we can satisfy your requirements in due course. You will need to approve this by completing the 'Order Acceptance'
box at the base of this form and return one copy to us along with payment in full.
Make: BMW
Model: E82
Inscription 135i
Reg.
Coupe
RH Motorsport

Blackpool
Mr Bryan Sweeney
Lancashire

PartNo Description Application Fitting (AW) Qty Parts Unit Retail Discount Sale Price
Rear Axle
E8233E82-135 Exchange Quaife BMW Final Drive 135i Manual with final drive 38 1 £1,395.00 10 £1,255.50
7588174
E8233828-175 Exchange Surcharge For 33-828-174 Refunded on return of 0 1 £750.00 0 £750.00
functional OE part in 14days
000000-003 Shipping U.K 0 1 £25.00 0 £25.00
Sub Total Rear Axle £2,030.50
Complete Quotation, Mail Order: £2,030.50
If you have any queries regarding this quotation and what is contained within the specification offered, we would be pleased to hear from you.
Yours sincerely,
Kevin Bird
Technical Director
James Bird
Quaife Sales Manager
I accept the proposed quotation, please contact me to confirm estimated delivery dates. Please note that deliveries can only be made to the
statement address of the credit/debit card nominated below.
I enclose a cheque for made payable to Kevin Bird Garages Ltd.
I approve for you to debit my Mastercard/Visa/Switch card in the sum of
Card No _____________________________________________________________________________
Valid From Date____________ Valid To Date____________Last 3 Digits on back ____________ Issue#__________ Type________________
Signature_______________________________________ Date_______________
£2,436.60
£2,436.60
ORDER ACCEPTANCE
+ 20 %

VO_M135i · Jan 21, 2016

Cotswold are offering M Performance LSD for just over £2300 and you get to keep standard to refit when you decided to sell the car on at a later date.

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M performance LSD

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