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      02-20-2009, 08:12 AM   #1
BarryC
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Review of 3.62 FD

Hi all,

Got my car back yesterday and my reaction to the change in acceleration is ! This mod really does make a big difference in all gears - car feels quite a bit more responsive than before. Downsides: traction in first gear from a dead stop - makes the car a little more tricky to launch and the kickdown function when in S mode at around 50mph is almost useless as you need to upshift almost as soon as you downshift. These are nits and I'm really pleased with the results.

Had the r&p change done at Korman Autoworks here in Greensboro. Guys did a great job and the cost was approx. $1,700 excl the cost a new diff cover. So total cost was just a little over $2k. This total includes the cost of removal and reinstall. Cheapest I've found yet! So for any DCT owners in NC who are interested in this mod - talk to Bob at Korman.

BC
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Last edited by BarryC; 02-20-2009 at 08:56 AM.
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      02-20-2009, 10:14 AM   #2
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Great deal, wow, great news.

Thx for the feedback
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      02-20-2009, 10:30 AM   #3
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How's the noise compared to stock?

Dave
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      02-20-2009, 10:32 AM   #4
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Quote:
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How's the noise compared to stock?

Dave
Yes, I would like to know this as well. Thanks for the feedback
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      02-20-2009, 11:13 AM   #5
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Quote:
Originally Posted by dcstep View Post
How's the noise compared to stock?

Dave
So far not a noticeable difference to me. They used Redline gear oil (75W90) which has a friction modifier so theoretically that should contribute to lower noise levels.

BC
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      02-20-2009, 11:34 AM   #6
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Quote:
Originally Posted by BarryC View Post
So far not a noticeable difference to me. They used Redline gear oil (75W90) which has a friction modifier so theoretically that should contribute to lower noise levels.

I love Redline products, but I thought that the friction modifier was to make the limited slip work, but had no impact on gear noise.

Dave
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      02-20-2009, 11:38 AM   #7
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congrats ...
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      02-20-2009, 12:03 PM   #8
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Quote:
Originally Posted by dcstep View Post
I love Redline products, but I thought that the friction modifier was to make the limited slip work, but had no impact on gear noise.

Dave
I know that the friction modifier is needed for limited slip so you're correct IMO. I thought I read somewhere that it can help with noise also. Either way - it works for me!

BC
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      02-20-2009, 12:24 PM   #9
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Quote:
Originally Posted by BarryC View Post
I know that the friction modifier is needed for limited slip so you're correct IMO. I thought I read somewhere that it can help with noise also. Either way - it works for me!

BC
We just used the BMW diff oil and it works fine ... no noise at all ...
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      02-20-2009, 01:45 PM   #10
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Congrats! This is a great mod. I had this done in my e46m3 and it was a completely different car.
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      02-20-2009, 03:42 PM   #11
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what is the stock Final drive
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      02-20-2009, 04:11 PM   #12
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3.15 stock FD DCT
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      02-20-2009, 05:01 PM   #13
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Regarding the traction issue you posted I have 295's with the 3.62 and it isn't an issue. If on the stock tires, I can see how you would have to worry in first. Really, it isn't any worse than stock.

For those members considering this mod, I'd be glad to help you get it cheap: http://www.m3post.com/forums/showthread.php?t=226492
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      02-20-2009, 07:03 PM   #14
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This is definitely on my list of to-do mods....
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      02-21-2009, 07:34 PM   #15
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Quote:
Originally Posted by Sticky View Post
Regarding the traction issue you posted I have 295's with the 3.62 and it isn't an issue. If on the stock tires, I can see how you would have to worry in first. Really, it isn't any worse than stock.

For those members considering this mod, I'd be glad to help you get it cheap: http://www.m3post.com/forums/showthread.php?t=226492
Sticky,

what rims do you have on the rear axle?
295/25/19 I guess? what brand?
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      02-21-2009, 07:38 PM   #16
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Sticky,

what rims do you have on the rear axle?
295/25/19 I guess? what brand?
My rims are HRE C90's 19x10.5
295/30/19 PS2's
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      02-21-2009, 07:49 PM   #17
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Quote:
Originally Posted by Sticky View Post
Regarding the traction issue you posted I have 295's with the 3.62 and it isn't an issue. If on the stock tires, I can see how you would have to worry in first. Really, it isn't any worse than stock.

For those members considering this mod, I'd be glad to help you get it cheap: http://www.m3post.com/forums/showthread.php?t=226492
yeah ... sticky is right ... i have 285/30/20 and have 0 issues with the traction ...
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      02-21-2009, 07:49 PM   #18
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I agree definately a great mod. No issues with traction on mine yet either, however I'm still in the breakin period.
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      02-21-2009, 07:54 PM   #19
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Quote:
Originally Posted by KKSigua View Post
I agree definately a great mod. No issues with traction on mine yet either, however I'm still in the breakin period.
cool ... so now it is 5 of us with 3.62s

Last edited by doba_s; 02-23-2009 at 02:30 AM.
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      02-21-2009, 09:24 PM   #20
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ok ok regarding traction....i should clarify too that the temp's been between 20-45F here so that plays into the equation too. I'm running 285/30/19 in the rear on 10.5" rims.

One thing I found out by mistake is that when I tried the kickdown mode at around 60 the car for some strange reason went to 2nd instead of 3rd. It could have resulted in a mechanical overrev but the car just went to neutral/clutch disengaged. It's never gone to 2nd at 60 except for that one time. Anyway it seems there is a protection trigger in the software to mitigate the risk of a mechanical overrev I guess

Thx,
BC
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      02-23-2009, 02:34 AM   #21
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Quote:
Originally Posted by BarryC View Post
ok ok regarding traction....i should clarify too that the temp's been between 20-45F here so that plays into the equation too. I'm running 285/30/19 in the rear on 10.5" rims.

One thing I found out by mistake is that when I tried the kickdown mode at around 60 the car for some strange reason went to 2nd instead of 3rd. It could have resulted in a mechanical overrev but the car just went to neutral/clutch disengaged. It's never gone to 2nd at 60 except for that one time. Anyway it seems there is a protection trigger in the software to mitigate the risk of a mechanical overrev I guess

Thx,
BC

hm ... it is good to know ...
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      02-23-2009, 03:18 AM   #22
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Quote:
Originally Posted by BarryC View Post
ok ok regarding traction....i should clarify too that the temp's been between 20-45F here so that plays into the equation too. I'm running 285/30/19 in the rear on 10.5" rims.

One thing I found out by mistake is that when I tried the kickdown mode at around 60 the car for some strange reason went to 2nd instead of 3rd. It could have resulted in a mechanical overrev but the car just went to neutral/clutch disengaged. It's never gone to 2nd at 60 except for that one time. Anyway it seems there is a protection trigger in the software to mitigate the risk of a mechanical overrev I guess

Thx,
BC
Probably the same protection that prevents you from downshifting from 2nd to 1st at 50mph...

Did you ever try the kick down at say 70mph with the stock FD? Did it go to 2nd then?
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