Help with LSD's - Page 2

ScotcH · 10-29-2009, 11:33 AM

Quote:

Originally Posted by njansenv

How much do you want for the 2.93LSD ScotcH?

I dunno ... how about $200 + shipping (or pickup in Ottawa)? I might be able to deliver in a couple of weeks since my wife is heading to Burlington.

ryanjv · 10-29-2009, 04:45 PM

is there anything that needs to be done to anything else to the car if you're doing something like this? or is it just a case of swap out open for LSD and you're set

Fern3 · 10-29-2009, 05:07 PM

Edit: misunderstood you, it's plug and play.

ryanjv · 10-29-2009, 07:35 PM

sorry i should have been more clear. i meant that in the sense of will anything else have to be upgraded as a result. for example, when swapping in a bigger engine you tend to upgrade other things like suspension, transmission etc.

will the LSD require anything new?

my 318 is pretty much stock. one of the reasons i'm wanting an LSD is because during the winters, i'm in kingston and we get bad winters and with an open differential i've found that i get stuck way too easily.

Fern3 · 10-29-2009, 08:16 PM

The LSD won't require anything new, you'll
just have to shift more often unless you buy an LSD with the same ratio in that case all you'll gain is limited slip, your torque at the wheel and shifting frequency will remain the same

mhamouda · 10-29-2009, 11:23 PM

[QUOTE=BMXWill;1360503]

now .[/with my 3.23 I have to drive 15km/h slower than normal on the highway to prevent my girlfriend from going deaf lol]

why will she go deaf

BMXWill · 10-30-2009, 12:58 AM

[QUOTE=mhamouda;1361161]

Quote:

Originally Posted by BMXWill

now .[/with my 3.23 I have to drive 15km/h slower than normal on the highway to prevent my girlfriend from going deaf lol]

why will she go deaf

If im doing 130km/h my rpms are around 3600 and with my magnaflow exhaust it's really loud inside. If I had a different exhaust there wouldn't be a problem im sure but I enjoy the sound when I'm driving alone, all in all it's worth it. haha

mech9T8 · 10-30-2009, 12:14 PM

Quote:

Originally Posted by ryanjv

sorry i should have been more clear. i meant that in the sense of will anything else have to be upgraded as a result. for example, when swapping in a bigger engine you tend to upgrade other things like suspension, transmission etc.

will the LSD require anything new?

my 318 is pretty much stock. one of the reasons i'm wanting an LSD is because during the winters, i'm in kingston and we get bad winters and with an open differential i've found that i get stuck way too easily.

A new diff bolt may not hurt.

BSL · 10-30-2009, 11:29 PM

Some good info in this thread, but this:

Quote:

Originally Posted by propr'one

3.38
2.91/3.23=10.9% increase in torque
2.91/3.38=16.1% increase in torque

is total nonsense!!!

Sorry Ivan, I dont know where you found this, but your source is sorely mistaken

Torque cannot be increased past the flywheel, unless you use a torque, or preferably a stall, converter in an auto transmission.

Dr. Flyview · 10-31-2009, 02:27 AM

Quote:

Originally Posted by BSL

Some good info in this thread, but this:

is total nonsense!!!

Sorry Ivan, I dont know where you found this, but your source is sorely mistaken

Torque cannot be increased past the flywheel, unless you use a torque, or preferably a stall, converter in an auto transmission.

You are wrong. Wheel torque would be affected by everything that rotates in the driveline causing the ultimate torque at the surface of the wheel. He got the figures from 3.38/2.91 = 1.16 (116%) for example compared to 3.23/2.91 (110%)

Fern3 · 10-31-2009, 02:51 AM

Quote:

Originally Posted by Dr. Flyview

You are wrong. Wheel torque would be affected by everything that rotates in the driveline causing the ultimate torque at the surface of the wheel. He got the figures from 3.38/2.91 = 1.16 (116%) for example compared to 3.23/2.91 (110%)

THANK YOU!

the diff doesn't change the torque at the flywheel, the bigger the gears in the diff the more torque will be supplied at the wheels

BSL · 10-31-2009, 09:47 AM

I must be mistaken. Sorry for my over reaction.

**Mystikal** · 10-31-2009, 11:30 AM

Note though, that just because the torque is multiplied to the ground doesn't mean that the car will be faster. It will *feel* faster because of the increased torque, but the car will not necessarily *be* faster because of how flat the powerbands are on these cars combined with the time spent shifting.

I've crunched the numbers many a time, putting a shorter diff in ANY 6cyl E36 motor that doesn't at least have cams will not make it measurably faster. The reason the M52 came with such a tall diff is because the car falls flat on its face after 6000rpm, and makes great power from 3000-on. Installing a shorter diff does not make the car faster, although it will feel it.

The only exception could be an M52 with an M50 manifold running properly (dunno if that requires tuning). With the shifted powerband, something like a 3.15 or 3.23 would likely help. But anything else is just tricking yourself.

**Mystikal** · 10-31-2009, 11:36 AM

Quote:

Originally Posted by mech9T8

A new diff bolt may not hurt.

This is very, very true.

And buy the bolt from the dealer, it's a special grade like 9 piece of art. If someone who worked on the car before you owned it puts in a non-spec one and you drive your car hard, it will snap. Ask me how I know.

Fern3 · 10-31-2009, 12:27 PM

Thanks for the input mystikal. I'm hoping my current mods (m50 with aa tune) will help add to the lsds potential