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Old 10-27-2009, 08:50 PM   #1
Fern3
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Help with LSD's

I have decided that my next mod will be an LSD and I needed some advice on what ratio to go with, I commute 90km one way three days a week so i don't want to kill my fuel consumption.. I'm leaning towards a 3.23 but I'm wondering what the benefits and draw backs of going for a 3.38 other than the jump in cost? my current diff is an open 2.91.

thanks
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Old 10-27-2009, 11:18 PM   #2
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I'd say 3.23 LSD is a safe bet. I had the same dilemma and went with the 3.23 and didn't notice a difference in gas mileage, if anything it went up.
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Old 10-28-2009, 12:28 AM   #3
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went with the 3.23 and didn't notice a difference in gas mileage, if anything it went up.
Lol ... next time bolt on a super charger ... your mileage will double

I have a 2:93 LSD if you're interested
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Old 10-28-2009, 12:34 AM   #4
Fern3
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I'd say 3.23 LSD is a safe bet. I had the same dilemma and went with the 3.23 and didn't notice a difference in gas mileage, if anything it went up.
Was the difference in how hard your car pulled very noticable? I'm leaning towards the 3.38, I'm hearing good things about it from people that have owned both 3.38 and 3.23.


And no thanks man I'm looking for a higher ratio than that
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Old 10-28-2009, 12:57 AM   #5
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3.23 is good enough for a daily driver but anyone that installed a 3.38 will tell you that the difference is very humongous in acceleration, especially going from a open 2.93 to 3.38 lsd.
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Old 10-28-2009, 02:38 AM   #6
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3.23 is going to be most practical.

3.38 would be nice, I plan to get one next spring.

I had a 3.91, stay away! It's insanely fun but, not so great on gas.
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Old 10-28-2009, 02:40 AM   #7
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Lol ... next time bolt on a super charger ... your mileage will double
If I put two superchargers on will it quadruple the mileage? hahaha. I keep track of every tank and I honestly did not loose any range with mixed city and highway.

I noticed a significant difference in just switching to LSD. It was so much better in terms of power transfer. I have not driven a car with 3.38 so I can't speak on it. I just assume that your 90km commute is highway and that a 3.23 would be better suited towards that than a 3.38. Maybe it's not a significant difference.

Don't get me wrong, it's cooler to say you have a 3.38lsd but as it is 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.
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Old 10-28-2009, 10:18 AM   #8
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Not too sure why so many care about the fuel milage loss on a higher ration, I went from a 3:45 to a 3:91 and only lost about 80 klm per tank and got what I wanted, more tq and acceleration to make LSD even needed.
Going from a 3:23 to a 3:38 is such a small difference the change would be even less then mine was to the fuel milage.

3:38 IMO is were you should go, better yet a 3:46 if you can find one.

My milage didn't change after the supercharger, stayed the same.
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Old 10-28-2009, 11:49 AM   #9
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Thanks for all the replies guys, I'm going with a 3.38, found one with low mileage and a good price. Will update this thread when it's on about how it performs
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Old 10-28-2009, 12:05 PM   #10
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Not too sure why so many care about the fuel milage loss on a higher ration, I went from a 3:45 to a 3:91 and only lost about 80 klm per tank and got what I wanted, more tq and acceleration to make LSD even needed.
Going from a 3:23 to a 3:38 is such a small difference the change would be even less then mine was to the fuel milage.

3:38 IMO is were you should go, better yet a 3:46 if you can find one.

My milage didn't change after the supercharger, stayed the same.


Losing 80km/tank would cost me $500 a year.
How much do you want for the 2.93LSD ScotcH?
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Old 10-28-2009, 04:57 PM   #11
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I had gone with a 3.23 LSD and liked the difference.....and I am on the same boat where I have to handle the throttle with care so my girlfriend will not go dead on extended trips. :-) As I also have a Genie Sports Exhaust which came with the car, but want to replace with Borla...which I find may be a little more subtle...

Paul
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Old 10-28-2009, 05:33 PM   #12
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3.38

you'll either get one now, or get a 3.23 now and a 3.38 in a year.

Since people like inventing things i'll do the math for you
2.91/3.23=10.9% increase in torque
2.91/3.38=16.1% increase in torque

Last edited by propr'one; 10-28-2009 at 05:38 PM.
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Old 10-28-2009, 05:45 PM   #13
Fern3
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3.38

you'll either get one now, or get a 3.23 now and a 3.38 in a year.

Since people like inventing things i'll do the math for you
2.91/3.23=10.9% increase in torque
2.91/3.38=16.1% increase in torque
thanks for putting it in numbers, 3.38 it is.
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Old 10-28-2009, 05:59 PM   #14
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I have a 3.38 and average 28mpg american. On a trip I hit 31, doing 110-120km/h most of the way. Right now I have 1/4 tank left according to the gauge and have over 600km put on it so far. But I have a 323is. *edit - I just noticed you have a 323is as well, so there you go*
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Old 10-29-2009, 10:49 AM   #15
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Originally Posted by propr'one View Post
3.38

you'll either get one now, or get a 3.23 now and a 3.38 in a year.

Since people like inventing things i'll do the math for you
2.91/3.23=10.9% increase in torque
2.91/3.38=16.1% increase in torque
How did you come up with the math? I am curious as to what my TQ increase was.
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