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Old 12-07-2016, 06:49 AM   #1
BlackBMWs
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Default Experiences with LSD Diff ratios for track S52

I'm seeking your experience and insights on what you have found effective for a track LSD ratio for a S52 swap. Reading and learning as much as possible.

I have I believe a 2.93 LSD on my S52 TI just now, and run a 3.45 LSD with my other TI with a M44 now. Figure I can still be quick and responsive with an E28 3.46 or lower the ratio for the S52 and get better top end on an E28 3.25.

Thoughts? Thanks!
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Old 12-07-2016, 11:21 PM   #2
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with the stroked m42 i run a 4.4 with a 328i / m3 gearbox and don't use first gear any more. the ratios are pretty good and it will reach 110mph. on my 328i powered ti, i have a 316i gearbox with a 3.7 final drive and no longer use first gear in that car either. when it rains both cars will spin the wheels in fourth and can be quite a handful but great fun. i have bought a honda s2000 gearbox which i would like to try as it has 6 gears (making 5 usable ones without using 1st) there is a gear calculator somewhere on the net which you put in the tyre size, gearbox ratios etc and it works out speed in each gear which is very helpful for deciding which combination to go for
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Old 12-10-2016, 01:35 AM   #3
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Quote:
Originally Posted by jerseytim View Post
with the stroked m42 i run a 4.4 with a 328i / m3 gearbox and don't use first gear any more. the ratios are pretty good and it will reach 110mph. on my 328i powered ti, i have a 316i gearbox with a 3.7 final drive and no longer use first gear in that car either. when it rains both cars will spin the wheels in fourth and can be quite a handful but great fun. i have bought a honda s2000 gearbox which i would like to try as it has 6 gears (making 5 usable ones without using 1st) there is a gear calculator somewhere on the net which you put in the tyre size, gearbox ratios etc and it works out speed in each gear which is very helpful for deciding which combination to go for


Interesting idea with the S2K tranny swap, let us know how it goes with that, might even be cheaper than an s54 tranny swap besides the bell housing fabrication!


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Old 12-10-2016, 07:42 PM   #4
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Is something like this gear ratio/mph calculator what you are looking for? http://www.andysautosport.com/learni...r/calculators/

As for an LSD on the track I can't comment. I do have a modded M50 with a 4.10lsd. I can imagine for autox it would be alright but would run out of gearing on a track. I'm at 4K roughly at 70.
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Old 12-11-2016, 09:04 PM   #5
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118Mph at 7200 rpm (M52B28) with (323) getrag 5 sp box and a S3.91 (40/25)
all M3 are behind
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Old 12-12-2016, 05:49 AM   #6
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Thanks all! I'll drop in a 3.25 LSD and see how that works for our local tracks. I'll assess what gets installed in next.


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1998 318ti Sport - "Cali" Schwartz II/Schwartz sport interior, Cali top
1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52
1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior
1995 318ti Active - "Blanca" Alpineweib III/Schwartz leather interior

Other Current Bimmers: 2000 2.3L Z3 / 1997 1.9L Z3 / 1991 318ic / 1999 540it

1997 318ti Sport - "Huera" - RIP
1995 318ti Active - RIP
1995 318ti Sport - "Tiny" Sold
1994 325i Sedan - "Jade" - Sold
1985 635csi sold
1984 533i "Max" Sold
1984 318i sold

BMWCCA #160411

SUPPORT 318ti.org! CLICK THE LINK ABOVE!
Hosting a forum like this is not free. 318ti.org is one of the best BMW forums on the web because it is member supported, not vendor supported. The cost to become a Supporter is a nominal $10.00... A YEAR! DO IT! NOW!
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Old 12-12-2016, 05:59 AM   #7
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go directly to a 3.46 or a3.64 you didn't recognise your car
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Old 12-12-2016, 06:09 AM   #8
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I think a 3.46 with the S52 would be awesome. It'll come...


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1998 318ti Sport - "Cali" Schwartz II/Schwartz sport interior, Cali top
1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52
1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior
1995 318ti Active - "Blanca" Alpineweib III/Schwartz leather interior

Other Current Bimmers: 2000 2.3L Z3 / 1997 1.9L Z3 / 1991 318ic / 1999 540it

1997 318ti Sport - "Huera" - RIP
1995 318ti Active - RIP
1995 318ti Sport - "Tiny" Sold
1994 325i Sedan - "Jade" - Sold
1985 635csi sold
1984 533i "Max" Sold
1984 318i sold

BMWCCA #160411

SUPPORT 318ti.org! CLICK THE LINK ABOVE!
Hosting a forum like this is not free. 318ti.org is one of the best BMW forums on the web because it is member supported, not vendor supported. The cost to become a Supporter is a nominal $10.00... A YEAR! DO IT! NOW!
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