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Old 08-08-2009, 07:56 AM   #21
skang330
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very nice
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Old 08-08-2009, 08:54 AM   #22
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Originally Posted by Alex323Ci View Post
Nice work, seems as the M3s become more extinct we see more of these being done. I'm sure it's tons of fun compared to before.
I couldn't do a 3.62 on my highway driven 5 speed, it be a bit much.

I have to wonder if $2300CAD for a used diff might still be too close to being much better/cheaper by going the other route and adding a new LS unit to a better matched geared diff?
You can always sub the M3 diff for an E39 M5 diff, which is 3.15:1.
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Old 08-08-2009, 04:16 PM   #23
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You can always sub the M3 diff for an E39 M5 diff, which is 3.15:1.
Are you sure they are the same shape and can be swapped? Because the axle output shafts are not the same and the rear diff cover is not the same either. So you'd have to buy a $500 M3 diff cover and then figure how the axles would bolt up.
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Old 08-08-2009, 06:00 PM   #24
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Are you sure they are the same shape and can be swapped? Because the axle output shafts are not the same and the rear diff cover is not the same either. So you'd have to buy a $500 M3 diff cover and then figure how the axles would bolt up.
True about the cover, but are the axle outputs actually different? Realoem has a different part number, but the diagram is identical for the M5 and M3...

This is where I got the M5 diff idea, but now I'm not so sure its feasible. Either way, I'm going M3 diff

http://forum.e46fanatics.com/showthread.php?t=692861
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Old 08-09-2009, 12:41 AM   #25
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True about the cover, but are the axle outputs actually different? Realoem has a different part number, but the diagram is identical for the M5 and M3...

This is where I got the M5 diff idea, but now I'm not so sure its feasible. Either way, I'm going M3 diff
http://forum.e46fanatics.com/showthread.php?t=692861
you can't always go by the diagram sketches. those are often just used on others of similar shape for similar categories. i can't say for certain that they are different, but the ETK does show it not being the same part. and if the M5 diff cover is different, who can say if the diff shape is even close enough to use at all.
from the thread you posted, it just shows someone thinking of using the M5 diff because of the ratio. it doesn't seem they are saying it will/would fit or if they even spent time checking it out yet. so seems we need some more info before we can suggest it possible to work.
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Old 08-09-2009, 01:34 AM   #26
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Old 08-10-2009, 06:27 PM   #27
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dude thats awesome i just aquired the parts and all i need to worry about is the is the driveshaft.. where did u get it done? did u just modify the flange on your existing driveshaft or did u get a whole new one?
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Old 08-10-2009, 06:37 PM   #28
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Old 08-10-2009, 06:42 PM   #29
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i dunno but i do know that i want your seats! lol, sry for the threadjack carry on....
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Old 08-10-2009, 06:43 PM   #30
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ohh and hey can you maybe give me the specs of the driveshaft you used?
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Old 08-12-2009, 09:47 AM   #31
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hehe i just dropped the parts off at my mechanics... im soo excited!
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Old 08-24-2009, 03:00 PM   #32
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Finally got the car back after the rear drivetrain conversion. This included everything from the diff backwards, including hubs/brakes/arms/subframe - everything. While the whole swap is a straight bolt-on, there is a serious issue for 5spd owners. I had to have my 5spd driveshaft modified to fit with my existing 5spd transmission and the larger 3.62 LSD, which was a nasty surprise that cost another couple hundred. Simply using the M3's 6spd driveshaft wouldn't work either. However, this is NOT an issue if you have a 6spd car.

Initial impressions

Wow! First few gears pull like CRAZY! The car feels noticeably quicker, and the response is so much better. Ie. Before, at low speeds in 2nd gear it would take a while for the revs to hit the powerband and feel the acceleration. Now, just stomp the gas and it reaches the powerband MUCH quicker.

At 70mph I'm still just below 3500RPM. I was worried about excessive fuel consumption due to revving higher at highway speeds but I honestly have not seen a significant reduction. Yes, it will be lower but not anything that outweighs the pros of having the shorter geared diff.

I haven't had a chance to try the best feature of the LSD yet: sideways action. Still waiting on my tires to come in before I can safely exercise that
Hi, I need to know about the pic in your signature. The car is equipped with which tire?
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Old 08-28-2009, 05:45 PM   #33
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Old 08-31-2009, 03:49 PM   #34
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You have to run m3 rims in the back, right?
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Old 08-31-2009, 04:08 PM   #35
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You have to run m3 rims in the back, right?
No, you don't, but you're not going to be able to do this on an xi.
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Old 08-31-2009, 04:12 PM   #36
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How not? Can you use the existing hubs?

And why can i not do this to an xi as long as I match the diff ratio in the front diff?
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Old 08-31-2009, 07:07 PM   #37
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How not? Can you use the existing hubs?

And why can i not do this to an xi as long as I match the diff ratio in the front diff?
The M3 rear end isn't any wider, its the offset of the rims that make the stance wider, AFAIK.

Where are you planning to find a 3.62 front diff?
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Old 08-31-2009, 07:26 PM   #38
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That would make sense on the width.

That's not what i'm thinking. One way that I could beef up the xi drivetrain to handle a sc is to install the m3 rear subframe assembly (larger diff, stronger half shafts). I have no plan of using a 3.62 - way too high for me.
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Old 08-31-2009, 08:23 PM   #39
AdamBath
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That would make sense on the width.

That's not what i'm thinking. One way that I could beef up the xi drivetrain to handle a sc is to install the m3 rear subframe assembly (larger diff, stronger half shafts). I have no plan of using a 3.62 - way too high for me.
Then what the hell are you going to use? You've got a choice of 3.62 or 4.10 with M3 diffs, and if you're going to custom build a diff, then why not custom build one meant for your car?
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Old 08-31-2009, 08:30 PM   #40
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Then what the hell are you going to use? You've got a choice of 3.62 or 4.10 with M3 diffs, and if you're going to custom build a diff, then why not custom build one meant for your car?
lol, seriously. An OS Giken limited slip unit is $1600 and you just install that in the stock rear end. You'd need one anyway in the front because an M3 LSD won't fit the front of an xi. Heh, and you would need both front and rear lsd otherwise whatever axle didn't have one would have a spinning tire. So $3200+ to make a limited slip xi.
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