[dmboone25]

Just curious--is Dinan going to put out a cold air intake for the 07 328i coupe? I have been told that is one of the easiest ways to boost the 230 horses that will come standard under the hood.

I have also heard some things @ the dealer about chips and downloads, but no specifics. Could anyone shed any light?

[dmboone25]

I guess this was a dumb question......

[Driv3r]

fujita is usually the first company to release air intakes for bmw. they are "Competition" intake systems.

[crex]

I am trying to find out how to get this engine to 330i levels. I mean its the same engine right?

[dmboone25]

That is exactly what I thought--it is the same engine in the 325, 330 E90 as the 328, 335 E92s--they are just tuned differently right? That is why I thought if a cold-air intake would fit a 325 E90, then I could put it on my 328 E92 (currently floating across the ocean).

Maybe that is completely dumb, but that is how i understood the differences in each model.

Thoughts, anyone?

[Biemdreamer]

I may be wrong - but due to a strange series of events I will be getting a 2007 328i E90 to replace my 2006 325i E90. I purchased the Dinan cold air intake for my 325 - didn't get around to putting it on yet - thank goodness! Anyways, I plan to put it on my 328 - it is the same engine as the 325 - either tuned differently and/or changes made to transmission yield changes to output. Either way I believe the CAI from Dinan will work just fine to boost my HP and ftlbs. Good luck.

[ksfrogman]

The E90 328i is not the same engine as in the E90 325i/330i. It is the one from the X3.

[crex]

Originally Posted by ksfrogman

The E90 328i is not the same engine as in the E90 325i/330i. It is the one from the X3.

How do you know this? also, the x3 is rated at 260hp and 225 ft-lbs... so is the 328 just underated or undertuned..???

[SteveMD]

The 328i doesn't have the N52 engine??

[ksfrogman]

Originally Posted by crex

How do you know this? also, the x3 is rated at 260hp and 225 ft-lbs... so is the 328 just underated or undertuned..???

The E90 330i is rated at 255 HP, and the US E90 325i at 215 HP, yet both use the same engine.

There has been a lot of discussion about engine types in these forums, and the general consensus is that the E90 328i has the N53 engine. The E90 325i and 330i utilize the N52, and the E90/E92 335i, the N54.

Originally Posted by SteveMD

The 328i doesn't have the N52 engine??

I too have seen conflicting info on this, but check this link out:

http://www.e90post.com/forums/showthread.php?t=17829

I'm beginning to have some doubts on these rumors, because it's my understanding the 328i does not have direct injection yet, at least in the U.S.

[ksfrogman]

Okay, here's an update. I did some research, and the E92 coupe is one of the first vehicles to use an enhanced version of the original N52. This new and improved engine is referred to as the N52KP or N52B3001. The current E90 325i/330i use MSV70 for engine management. The new one uses MSV80. As with the E92 335i, the 328i uses a lighter weight plastic material for the throttle valve. The sensor is "magnetoresistive," which has no moving parts, and gives much more accurate feedback for the DME. The air mass flow sensor now uses a heated film rather than the previous hot-wire arrangement on the HLM. This new version is called HFM or Hot Film Air Mass Meter. This makes the new meter less prone to effects of contamination.

Here are exerpts from the BMW tech training manual. What I find interesting is that power output is not much different for the "high output" version, though the enhancements do make the engine more mechanically sound. I would think the changes would also make the engine more responsive.

I believe there has been talk of a direct injection motor for the 328i (E90Fleet had posted some photos), but that may be a few years off.

By the way, see that compact SUV photo down below?

[crex]

Originally Posted by ksfrogman

Okay, here's an update. I did some research, and the E92 coupe is one of the first vehicles to use an enhanced version of the original N52. By the way, see that compact SUV photo down below?

Nice! very good info. Any idea what the difference between the high output version in the x3 at 260 hp and the medium output version in the 328 is? I'm wondering if its just software.

[ksfrogman]

Originally Posted by crex

Nice! very good info. Any idea what the difference between the high output version in the x3 at 260 hp and the medium output version in the 328 is? I'm wondering if its just software.

I don't know the answer to this question as BMW is not forthcoming with the info, but I suspect it may have something to do with the number of DISA actuator motors in the intake manifolds. Take a look at this thread I posted:

http://www.e90post.com/forums/showth...ighlight=stage

Those motors actuate valves that selectively channel the flow of intake air from the front (cylinders 1,2,3) to the rear cylinders (4,5,6) via overshoot and resonance pipes. The 330i uses a three-stage system, and if you read the fine print, it implies that there may be both a one-stage and two-stage system.

[ksfrogman]

One more thing. The channeling of intake air within the intake manifold directly affects how the cylinders fill at different engine RPMs. So based on an educated guess alone, the VANOS could be programmed differently depending on the intake manifold type. If the E90 325i has collector and resonance pipes that cannot be closed off at idle or during medium engine speed ranges, the cylinders would get too much air and fuel at those engine speeds. To compensate, the valve lift could be reduced via Valvetronic control. Or hypothetically, the amount of air flow into the cylinders could be decreased uniformly (via cam or VANOS control). This is interesting, because it could explain why the 325i N52 puts out less peak power at higher rpms.

[ehhhwik]

can we just put in the existing aftermarket intakes, like fujita, into the e92 328i?

[Rchan.]

Originally Posted by crex

How do you know this? also, the x3 is rated at 260hp and 225 ft-lbs... so is the 328 just underated or undertuned..???

The 328 uses a single stage intake manifold and the X3 uses a 3-stage.
The difference is like a 325 and a 330, the engine is the same but the intake manifold alone(+ECU of course) is why they have produce difference power.