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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > 328i mods?



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      09-30-2010, 08:11 PM   #23
e90pilot
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my engine is untouched, completely stock and the whole power ban feels flat, and i have a manual. i think bmw did it on purpose to make the 330 seem better. in all reality the 06 325 has decent power just unimpressive acceleration.
Yes, BMW intentionally tuned the 325i slower. If you look at dynos from both cars, you'll notice the air/fuel ratio is richer on the 330i which allows it to run more spark advance. The 325 also runs less valve lift at full throttle and even less lift at high rpm to cap off peak power. That's one of the reasons the 328 has 15 more HP with almost the same engine.
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      09-30-2010, 09:14 PM   #24
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just out of curiosity what does this powerbox do. i had a 16v gti back in the day and there was a similar device but that one implemented the cold start fuel increase at full throttle. besides the drive by wire delay improvement where does the claimed increase in power come from with this bms product?
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      10-01-2010, 01:04 AM   #25
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What brand ecu upgrade to go with?
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      10-03-2010, 11:39 AM   #26
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Quote:
Originally Posted by e90pilot View Post
Yes, BMW intentionally tuned the 325i slower. If you look at dynos from both cars, you'll notice the air/fuel ratio is richer on the 330i which allows it to run more spark advance. The 325 also runs less valve lift at full throttle and even less lift at high rpm to cap off peak power. That's one of the reasons the 328 has 15 more HP with almost the same engine.
learned a whole lot O_O
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      01-18-2011, 09:34 PM   #27
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Hey jopa489,

how did you get your headlights to look like that (deleted amber)?
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      01-20-2011, 07:35 AM   #28
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Has anyone with 6MT tried changing the rear axle ratio? Stock is 3.23. 6AT has 3.73. Going from 3.23 to 3.73 would send 15% more torque to the drive wheels.
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      01-20-2011, 12:43 PM   #29
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A lot of people have done that. That is on my to-do list.
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      01-20-2011, 12:45 PM   #30
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What do you think it will cost? $1500-$2000?

Thanks.
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      01-20-2011, 01:10 PM   #31
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The 3-stage manifold functions properly without the tune, and you can feel a difference. I am using the 3 stage with a PBX right now, and it made a very noticeable improvement compared to without the manifold.

The tune will make it much better though, as e90pilot pointed out.
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      01-20-2011, 04:27 PM   #32
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Not sure. My diff was replaced already for $2k even but that was a brand new one and before I had the idea of getting the automatic one. You can get one out of a junked car.
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      01-21-2011, 03:23 PM   #33
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I would look into the BMS Powerbox for added power and improved throttle response.
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      01-29-2011, 12:44 AM   #34
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Quote:
Originally Posted by e90pilot View Post
Not sure. My diff was replaced already for $2k even but that was a brand new one and before I had the idea of getting the automatic one. You can get one out of a junked car.
Time to find a junk 330 lol what do u mean by "automatic one"?
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      01-30-2011, 02:33 AM   #35
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i just got my 328xi and i love it. i was going to start modding the shiz out of it with performance exhaust, euro intake, powerbox but then i figured something out. i bought the 328 cause i did not need a superfast and loud car...i got one of those already. so im going to throw some 19s on it and maybe a couple more appearance mods. IMO if you want to go fast in a e90/92 just spend a few extra dollars and get the 335. not only faster but better brakes and all that good stuff. makes way more sense.
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      01-30-2011, 03:20 AM   #36
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Quote:
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Time to find a junk 330 lol what do u mean by "automatic one"?
A diff from a car with an automatic transmission. The ratio is shorter. You'll have better acceleration but rpm cruising in 6th will be higher.
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      01-30-2011, 03:28 AM   #37
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Quote:
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Try a AFE intake should get you about 15 HP to the wheel seriously recommend getting it.. YOU WILL FEEL the HP .. its incrediable
I seriously just lol'd.

The day I see a stock 328 with just the aFe intake dyno higher numbers than a drop in filter, I will concede and put mine back on.
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      01-30-2011, 11:50 PM   #38
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Originally Posted by e90pilot View Post
A diff from a car with an automatic transmission. The ratio is shorter. You'll have better acceleration but rpm cruising in 6th will be higher.
Do you know how much acceleration can you get from that? Does it work in the 1ers?
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      01-31-2011, 12:10 AM   #39
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Do you know how much acceleration can you get from that? Does it work in the 1ers?
The 128 and 328 6MT both have 3.23 rear axle ratios. The 128 and 328 6AT both have 3.73.

If you put the 3.73 diff in a 128 or 328 with a 6MT, 15% more torque will be sent to the drive wheels. I would GUESS that would cut the 0-60 time by about half a second.
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      07-06-2011, 11:38 AM   #40
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PBX + AFE Stage 2 Intake is amazing got both setups under the hood now.

What exhaust system do you guys recommend purchasing for a pre-cli e90 (2007) 328i
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      07-06-2011, 11:28 PM   #41
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Quote:
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PBX AFE Stage 2 Intake is amazing got both setups under the hood now.

What exhaust system do you guys recommend purchasing for a pre-cli e90 (2007) 328i
A lot of guys are swapping out of afe because it apparently robs power rather than gain some. Stock airbox is better or the euro box is best.

Im picking up my oem performance exhaust tom or friday and i think its one of the top dawgs in quality/sound. Exhaust will only give us 5 hp/tq
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      07-07-2011, 12:02 PM   #42
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373 gears would be the best Acceleration mod you can get for the N52 & 6MT. However, I would not do it unless you can have a limited slip dif. installed. Otherwise, it will be tough to get traction in 1st gear.
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      09-06-2012, 07:08 PM   #43
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Although it is harder to get horsepower from the N52 engine, there are a few mods that have been extremely successful and have been proven to increase horsepower, torque, and throttle response. I would recommend that you check out the BMS Powerbox, AFE intake, and the Remus Exhaust system for your 328i. I'll shoot you over a PM with more details!

- Alan
can i get some info also?
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      09-06-2012, 07:53 PM   #44
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can i get some info also?
Yeah, not going to happen anytime soon dude. They've been banned from here for a while now...
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