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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 12-13-2007, 07:30 PM   #21
Novare330
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I hope someone else is paying for your gas.
they dont kno that he has a 3.91 diff, parents will be wondering why they are spending so much more on his gas bill ...
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Need some opinion. Stock Titanium Silver coupe without spoiler, using the 2 Fast 2 furious skyline vinyl scheme. What do you think, do it or not? plus, i think it would look better then what most car members have here.

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Old 12-13-2007, 07:33 PM   #22
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what is the "reset your computer with your key" trick?
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Old 12-13-2007, 07:33 PM   #23
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Actually, in the city it's not going to make much of a difference. I was cruising at 45 mph at 2000 RPM before, and now it's at 2200 RPM. On the highway before, I was doing 90 mph at only 3000 RPM, it's going to be a minimal increase. Gas mileage will suffer little at most. I did a lot of research into that before going in to it. The only time I would really get lower mileage is when I floor it, and I don't do that often.
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Old 12-13-2007, 07:34 PM   #24
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what is the "reset your computer with your key" trick?
Turn the key to Position 1 for 10 seconds, turn the car off for 10 seconds, and then start the car.
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Old 12-13-2007, 07:35 PM   #25
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Nice work Ken, very cool. On top of getting the lower gearing you also get the smaller diff that I'm sure is lighter (apparently in Europe the E46 comes with two different diff sizes).

One question, why didn't you just swap the input flange?

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Old 12-13-2007, 07:37 PM   #26
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Nice work Ken, very cool. On top of getting the lower gearing you also get the smaller diff that I'm sure is lighter (apparently in Europe the E46 comes with two different diff sizes).

One question, why didn't you just swap the input flange?

Tim
Thanks Tim! I picked up both diffs, and I think the new one is like 5 lbs. or so lighter than the old one.

I did swap the input flange, but since the diff dimensions are different, the stock driveshaft wouldn't reach. It wasn't a matter of not being able to bolt up, it was a matter of getting the driveshaft to even reach the input flange. To solve this, I needed a driveshaft that was longer.
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Old 12-13-2007, 07:42 PM   #27
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Ah, must have missed that.

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Old 12-13-2007, 07:47 PM   #28
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I'm a newb. What's position 1?
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Old 12-13-2007, 07:48 PM   #29
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When you turn your key, you turn it to the first little position, and the lights on the gauges turn on, then the 2nd and your accessories turn on, and then the 3rd position is cranking up the motor.
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Old 12-13-2007, 08:08 PM   #30
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sweet thanks. congrats on the diff swap by the way
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Old 12-13-2007, 08:08 PM   #31
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sweet thanks. congrats on the diff swap by the way
Thanks dude
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Old 12-13-2007, 08:29 PM   #32
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so sick dude...90mph at 3000rpm?!?!?! awesome..you have a 6 speed right?

my car is running almost 4000rpm at 90mph i think.....i wonder what its gonna be when i put my 3:46 rear in lol
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Old 12-13-2007, 09:09 PM   #33
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^an e36 m3 w/3.91 and same tires cruises at 92 in 5th gear @ 4750rpm, i dont think Ken will see 90mph @ 3 grand.
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Old 12-13-2007, 09:21 PM   #34
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^an e36 m3 w/3.91 and same tires cruises at 92 in 5th gear @ 4750rpm, i dont think Ken will see 90mph @ 3 grand.
i don't get it. didn't he say he already took it for a drive and was at 3k rpm's at 90? even if it's 3200, that's not too bad.

and the E36 M3 you referenced...was that a manual? if so, the numbers Ken's using seem accurate...he's got a step tranny. i have a 6sp manual with a 3.46 and i'm running about 3200rpm's at 80mph.

Good job Ken on taking this project on. Wish i could do a 3.64 on my car but i do lots of highway driving and it would kill my mileage.
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Old 12-13-2007, 09:27 PM   #35
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i don't get it. didn't he say he already took it for a drive and was at 3k rpm's at 90? even if it's 3200, that's not too bad.

and the E36 M3 you referenced...was that a manual? if so, the numbers Ken's using seem accurate...he's got a step tranny. i have a 6sp manual with a 3.46 and i'm running about 3200rpm's at 80mph.

Good job Ken on taking this project on. Wish i could do a 3.64 on my car but i do lots of highway driving and it would kill my mileage.
No, he said he did 90 @ 3k before the swap. The M3 I referenced is mythical...its a mathematical calculation. I believe diffsonline has a calculator on the site if you want to check the math. 3800 will get you around 90 in 6th.

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Old 12-13-2007, 09:29 PM   #36
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Shinobi, I just took it out for a quick spin.

1st ends at ~26 mph
2nd ends at ~50 mph
3rd ends at ~70 mph
Yikes...good thing you're not supercharged. You wouldn't be in 1st long at all. I did think about going with a lower ratio, but because I autox, I want to still be in 2nd over 60mph because courses are *usually* designed to be ~60 max. From what I hear, STI and EVO Guys hate having to shift to 3rd during their runs. I'd be curious what impact it has on your 1/4 mile times. You wouldn't happen to have a G-Tech Pro or something would ya?
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Old 12-13-2007, 09:33 PM   #37
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Sweet thread. Hey Kpeng, I have a 328i. What kind of differential do i have? and what choices do i have if i wanted to go for something better?
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Old 12-13-2007, 09:39 PM   #38
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3.91 seems WAY too low Ken, i mean im doin almost 70 in second gear right now. I mean if your happy with it thats all that counts Id def go 3.64 at most.
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Old 12-13-2007, 09:39 PM   #39
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Sweet thread. Hey Kpeng, I have a 328i. What kind of differential do i have? and what choices do i have if i wanted to go for something better?
Dude, read his original post. He gave you the link to all the info there, and its a link that gets posted in alot of the differential threads here. I'll even give it to you here:

http://www.bokchoys.com/differential
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Old 12-13-2007, 09:43 PM   #40
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No, he said he did 90 @ 3k before the swap. The M3 I referenced is mythical...its a mathematical calculation. I believe diffsonline has a calculator on the site if you want to check the math. 3800 will get you around 90 in 6th.
OOPS...my mistake. Yeah, the revs will definitely take a hit on the highway in that case. Either way, it's cool that he took the initiative to be the guinea pig on this one.
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