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      11-12-2020, 05:49 AM   #1
Brotherhef
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LSD or wider/better fires

335i m sport, all stock, daily driver. Mp4s tires. About 3-4 track days/year.

Came factory with 225 front and 255 rear, but previous owner changed to 225 squared.

I'm about to pull trigger on some new apex 9" wheels with 245 squared. My goal is better turn in and most importantly less interference of nanny's in sport plus mode coming out of a corner and therefore a better lap time.

Im leaning towards wider rubber over a LSD because that would be much lower cost and will be very easy to sell them and recoup some cost when I sell this car in a couple years. (Money aside, I'd get both, but I just don't want to drop that type of money because I won't keep long term).

What would you do?
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      11-12-2020, 09:47 PM   #2
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Lsd.
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      11-12-2020, 11:15 PM   #3
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why limit yourself to 245? you can easily fit 255, even a 265 on a 9"
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      11-13-2020, 02:50 AM   #4
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Quote:
Originally Posted by brigade24 View Post
why limit yourself to 245? you can easily fit 255, even a 265 on a 9"
In the front and without camber plates? Or are you just saying 165+ just on rear? Wasn't really wanting to get into suspension mods because I won't have the car long term. Same reason why I'm just considering some new wider rubber and wheels, which I'll be able to sell eventually and get back some without having to spend much time or money uninstalling parts.

Edit for extra info: Also, to my knowledge, a tire performs better when a tire has a slight stretch so there isn't as much rollover. (I could absolutely be wrong)
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      11-13-2020, 11:52 PM   #5
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      11-25-2020, 09:46 AM   #6
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I would just forget about resale in the equation. I would get a second set of wheels/rubber for the track only. I would also get the front camber sorted to extend tire life.


I think LSD (assuming mperf lsd) vs Wheels tires will work out to about the same price.

I ball park a set of Apex wheels with rubber in the 2k range and theMperf LSD is about the same price as well
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      11-26-2020, 05:32 AM   #7
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Both I would start with the stickiest and widest tires you can fit (start w/200tw). Tires are our connection to the pavement and how the car communicates with you in hard cornering, always start w/tires and brakes.
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      12-05-2020, 12:16 PM   #8
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One doesn't really replace the other. If you are going to invest $3000 in an LSD you should be ready to invest the money in a capable set of shoes to get the most out of it.

If you plan on selling the car just keep in mind that the LSD will not net you nearly the % in resale a set of wheels would. Also note that you can't really buy the MPerf LSD anymore so your only options are WaveTrac or Quaife. Both of these require you to send in your pumpkin for splitting the ring gear and installing the LSD. The turnaround time for this service is 3-4 weeks. I have gotten quotes on both applications through different partner shops, all were $3-3300.
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      12-05-2020, 02:15 PM   #9
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Post in the F3X Facebook group somebody name Tony Asam is selling one.
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      12-05-2020, 02:53 PM   #10
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LSD is nice but tires are the more important track factor.
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      12-05-2020, 09:55 PM   #11
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Thank you all for the info!
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      12-09-2020, 05:14 AM   #12
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There is no point in getting the LSD if you aren't going to get the tires. However, you can get the tires and still see significant gains without the LSD, so get the tires first. Then the LSD.
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      12-19-2020, 11:15 AM   #13
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Quote:
Originally Posted by Brotherhef View Post
In the front and without camber plates? Or are you just saying 165+ just on rear? Wasn't really wanting to get into suspension mods because I won't have the car long term. Same reason why I'm just considering some new wider rubber and wheels, which I'll be able to sell eventually and get back some without having to spend much time or money uninstalling parts.

Edit for extra info: Also, to my knowledge, a tire performs better when a tire has a slight stretch so there isn't as much rollover. (I could absolutely be wrong)
255s is the max you can fit in the front without suspension mods or plates. keep in mind that i am xdrive so my stock springs are different than yours. your ride hide may be lower since you're rwd which is something to consider. The rear can be significantly wider...you can easily run a 265 in the back if you are limited to 9".

you're partly right about rollover...depends on the sidewall characteristics of the tire. stretch matters alot less with a stiff sidewall (i.e. RE71R) than with a soft sidewall (i.e. Continental DW) so there are few factors to look at.
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      12-21-2020, 06:41 PM   #14
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Quote:
Originally Posted by jmg View Post
There is no point in getting the LSD if you aren't going to get the tires. However, you can get the tires and still see significant gains without the LSD, so get the tires first. Then the LSD.
That's what I was kinda thinking.
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