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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 05-03-2016, 01:09 PM   #1
N8bmw
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Join Date: Jan 2014
Location: Seattle
Posts: 12
My Ride: 330i 6 speed
3.64 diff review

Ok...I did a bunch of searching and research before this mod and I decided to write this review due to all of the negative posts about this ratio, 3.64.

A little background on my vehicle; 330i 6 speed w/ all bolt on mods except headers (still trying to figure out how I will pass smog). Car came with a 2.93 ratio stock, so this was quite a jump.

After install (very easy, about 2hrs), I took the car on a 600 mile road trip with quite a bit of highway driving. 1st gear is a little short but not as short as many have suggested (1st is not useless). Once you hit 3k RPM, the car comes alive no matter what gear you are in. Around town this mod is amazing! I shift out of 1st at about 30mph if I am not pulling all the way to red line (7k RPM). As long as you shift above 4k RPM there is no drop in accel from gear to gear.

On the freeway at 70mph I am at about 2850 RPM, at 75mph I am running about 3k RPM, and at 80mph I am sitting right about 3300 RPM. No noticeable added noise in the cabin and still averaged about 29mpg, previous was about 30/31mpg. In 6th at 3k if I simply role onto the throttle the car feels like it is in my old 3rd gear. Not saying that I went this fast but car can easily pull to 140mph and does so in what feels like twice the speed (exaggeration).

Overall thoughts:
I think this is a phenomenal upgrade, possibly the best bang for your buck mod you can do on an e46 non M. I am very happy with the performance and the downsides are easily overlooked (few more shifts and a few hundred RPMs higher). I would recommend this upgrade to anyone that has a dual purpose street/track car or even just the sports minded driver.
Bottom line, this ratio is not "too much" and IMHO this is how the car should have come from the factory.
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Old 05-11-2016, 01:16 PM   #2
thecos
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Join Date: Dec 2012
Location: NYC
Posts: 257
My Ride: 2002 325i Sedan
I have the 3.46 in my 5 speed and love it. I'd consider the 3.64 if I had a 6 speed.

You can flash your ecu to force O2 readiness for inspections. All the info is in the MS43 thread in this section of the forum.
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Old 05-12-2016, 10:23 AM   #3
N8bmw
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Join Date: Jan 2014
Location: Seattle
Posts: 12
My Ride: 330i 6 speed
Quote:
Originally Posted by thecos View Post
I have the 3.46 in my 5 speed and love it. I'd consider the 3.64 if I had a 6 speed.

You can flash your ecu to force O2 readiness for inspections. All the info is in the MS43 thread in this section of the forum.
My car has MS45 though. Any O2 readiness solutions for this setup?
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Old 11-24-2016, 08:20 AM   #4
stellios01
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Join Date: Nov 2016
Location: AUSTRALIA sydney
Posts: 4
My Ride: bmw e46 323i 1999 mo
I've just installed my reconditioned diff on my e46 323i bmw from ratio 3.07 had that modified to a 3.64 ratio with lsd conversion cost $1,900 australian. Before i modified this diff i had another 3.46 ratio diff the poinion stuffed up it was good atm but not good for drifting. With this difrental i got now installed 3.64 ratio with lsd is the best. Beter launches off the mark. 5-6% shorter that 3.46ratio. At 110km/h with 3.46 diff i was reving 3,200rpm. Now with the 3.64 ratio about 3,400-3500rpm in 5th gear. I've done other mods full exhaust system headers hi flow cats x pipe dual pipe mufflers. Also stage 2 remap and k@n cold air intake pod filter kit to helps with all of these mods my 323i beats stock standard 330i. My 323i does 6 sec 0-100kms.

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Old 11-25-2016, 02:40 AM   #5
stellios01
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Join Date: Nov 2016
Location: AUSTRALIA sydney
Posts: 4
My Ride: bmw e46 323i 1999 mo
I done same mod to with my e46 323i bmw diff gone from 3.07 ratio to a 3.46 ratio the poinion went on 3.46 diff. With my 3.07 difrental i reconditioned it changed gear ratios to 3.64 ratio and installed lsd part out of a e46 m3. Some way the company i took it to called diff technics are pros they bolt everything together nicely. I been driving my car now for 3 weeks with lsd 3.64 diff its amazing love it. Alot less lag in lower rpms. Best thing i done. Lsd is so much fun. Done other mods full exhaust system headers hi flow cats x pipe dual pipe mufflers. Stage2 remap. Cold air intake k&N Airfilter kit. The car unbelievable.

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