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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-18-2010, 09:17 PM   #21
AngelsNeverLose
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what does the 02' 325Ci 5speed come with? I have thought about switching mine out, but haven't had the time or money...? a little quicker and LSD upgrade would be awesome!
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Old 09-20-2010, 05:43 PM   #22
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Any more opinions?
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Old 09-21-2010, 02:31 AM   #23
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ime curious about the stock 325ci gears just like angelsneverlose. Any body know that answer?
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Old 09-21-2010, 05:55 AM   #24
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non DD, 3.46 ftw. i have a DD w/3.46 but i don't have a long way to go; 10 miles one way.
my other DD is a cc 2500 hd!
gas is cheap where i am.
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Old 09-21-2010, 05:10 PM   #25
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Anybody have a 3.46?
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Old 09-21-2010, 09:23 PM   #26
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Just wait for a 3.38 tha'd be perfect. In general it's not gonne be drastic between a 3.15 vs 3.46. Your cruising rpms may be like 200-300 rpms more.
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Old 09-22-2010, 02:15 PM   #27
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Honestly Stav. I Think Im gonna go with a 3.46... Wouldnt I have much shorter gears and more power. We'll not necessarily power but be quicker through gears.?
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Old 09-22-2010, 03:06 PM   #28
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I daily drive my 3.46. Cruising, I still get 29mpg.
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Old 09-22-2010, 03:09 PM   #29
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Nice! Haha thing is mines a garage queen so the mpg arent the biggest problem... But other than that I think the 3.46 gears are short enough and perfect.!
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Old 09-22-2010, 10:16 PM   #30
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I think the only time a 3.46 does not make sense is if you are FI'd. I think turbo cars like taller gearing. I know most of us twinscrew guys have some traction issues off the line so we opt for taller gearing for better control and less wheel spin.
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Old 09-23-2010, 09:07 PM   #31
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Well im going to go Fi Sometime in the near future... But probably not for another 2 years so a 3.46 would be good for temporary
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Old 09-24-2010, 04:49 AM   #32
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I think most Stage 2 kits will be the point where the gearing is too short. I have a 3.15 on a Stage 2 twinscrew, 1st and 2nd go by pretty quick.

IMO, 3.15 is just right for a stage 2 twinscrew. It is also hard to find, might want to hold onto the 3.15 for now if you plan to go Fi.
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Old 09-24-2010, 09:50 PM   #33
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i asked before, but got nothing...

What is the 02's 325Ci (5spd) stock gearing ratio, anyone know?
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Old 09-24-2010, 10:01 PM   #34
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i asked before, but got nothing...

what is the 02's 325ci (5spd) stock gearing ratio, anyone know?
3:15
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Old 09-24-2010, 11:20 PM   #35
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I had a 3.15 and switched it to a 3.46 and noticed shifting differences in 1st-3rd gears, after that the change is minimal. It does make it a lot more fun to drive though. I changed it out myself, followed the DIY links on the forum. So now I have a 3.15 for sale if anybody wants one.

If you can get your hands on a wrecked 325 automatic, they come with 3.46. the standards come with 3.15.
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Old 09-26-2010, 05:23 PM   #36
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I had a 3.15 and switched it to a 3.46 and noticed shifting differences in 1st-3rd gears, after that the change is minimal. It does make it a lot more fun to drive though. I changed it out myself, followed the DIY links on the forum. So now I have a 3.15 for sale if anybody wants one.

If you can get your hands on a wrecked 325 automatic, they come with 3.46. the standards come with 3.15.
Thanks for the reply man! So would you say the switch was worth it? Did you lose alot of MPG on the highway?

Most importantly, did it make the car a little quicker? Noticeable and worth the swap?

Let me know please! PM if you want...

im really looking at getting a little more out of my 325!
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Old 09-26-2010, 06:05 PM   #37
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Yes I would say it was worth the swap for sure. I did not see a big drop in MPG on the highway, the change in the 4th and 5th gears are hardly noticed. I say do it! if you do it by yourself, like I did, you will need to put the car on a lift and have quite a bit of upper body strength, the diffs themselves weigh 70-75 lbs. I am in the Army and we have car shops on post that you yourself can work in and I just drove it up on a lift and did it. I had the DIY papers in hand the whole way for sure!

The swap makes it quicker off the line and around town, you can drop it into 3rd and punch it to get ahead. I would do it again too!
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Old 09-26-2010, 06:16 PM   #38
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Yes I would say it was worth the swap for sure. I did not see a big drop in MPG on the highway, the change in the 4th and 5th gears are hardly noticed. I say do it! if you do it by yourself, like I did, you will need to put the car on a lift and have quite a bit of upper body strength, the diffs themselves weigh 70-75 lbs. I am in the Army and we have car shops on post that you yourself can work in and I just drove it up on a lift and did it. I had the DIY papers in hand the whole way for sure!

The swap makes it quicker off the line and around town, you can drop it into 3rd and punch it to get ahead. I would do it again too!
ok, so for example... the 0-60mph or 0-80mph got quicker (noticeable)? Is the pull in 3rd still a little better then stock (aka more passing grunt i think you hinted at)? I just want to make sure if i do it, it makes me faster and i can feel it... or know im getting to redline faster.

Then basically 4th and 5th are the same? Which is fine with me...

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Old 09-26-2010, 06:22 PM   #39
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ok, so for example... the 0-60mph or 0-80mph got quicker (noticeable)? Is the pull in 3rd still a little better then stock (aka more passing grunt i think you hinted at)? I just want to make sure if i do it, it makes me faster and i can feel it... or know im getting to redline faster.

Then basically 4th and 5th are the same? Which is fine with me...
Yes 0-60 and up to 80 is very noticeable. First gear is almost not there if you mash the gas hard enough. It is very fun to drive, like I said. much more passing grunt as you call it
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Old 09-26-2010, 07:53 PM   #40
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Yes 0-60 and up to 80 is very noticeable. First gear is almost not there if you mash the gas hard enough. It is very fun to drive, like I said. much more passing grunt as you call it
OK, Thank You for the help!
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