Euro HFM mod on m52b28 - BMW Forum

drz · 05-08-2006, 11:29 PM

I am thinking of doing the 3.5" Air flow sensor (AFM, aka HFM) mod on my 2.8

Everywhere I look, it seems like it is only done on M3's

I read somewhere that the torque curve is affected so that the peak torque is reached at higher RPM. What do you know about this?

Is there any reason why I shouldn't do it on my car?

///M Power · 05-09-2006, 12:43 AM

are you planning on upgrading other restrictions in your induction system?

drz · 05-09-2006, 01:05 AM

CAI and M50 intake manifold

///M Power · 05-09-2006, 01:16 AM

What's the size on those? throttle body might be restrictive as well as the CAI. I dont thinkt he m50 manifold is any larger on the intake hole.

drz · 05-09-2006, 01:20 AM

hmmm.... will look into that. I would get a 3.5" CAI, but now you got me thinking about the throttle body. I would probably have to do from 3.5 to 3" at some point. I don't remember my gas dynamics all that well at the moment, but I am thinking it would still be better than leaving the stock AFS.

Why does it work on M3's?

///M Power · 05-09-2006, 01:42 AM

My assumption is just because not a lot of companies feel like mass producing the software for a 328 with 3.5 HFM. I really can't think of any other reason at this moment.

saltshaker185 · 05-09-2006, 02:23 PM

Quote:

Originally Posted by ///M Power

My assumption is just because not a lot of companies feel like mass producing the software for a 328 with 3.5 HFM. I really can't think of any other reason at this moment.

+1 thats all i can think of too... your just the only one that wants to do that mod on a 328! :lol::lol: but no im sure if you look around or if your near a tuner shop they will map some software for you...

Active Autowerke II · 05-09-2006, 02:39 PM

Quote:

Originally Posted by drz

hmmm.... will look into that. I would get a 3.5" CAI, but now you got me thinking about the throttle body. I would probably have to do from 3.5 to 3" at some point. I don't remember my gas dynamics all that well at the moment, but I am thinking it would still be better than leaving the stock AFS.

Why does it work on M3's?

The M50 manifold and the 3.5 euro hfm with larger injectors and software. thats the best recipe, the larger throttle body really doesn't make more power. A more free flowing exhaust would also help.

drz · 05-09-2006, 07:30 PM

Quote:

Originally Posted by Active Autowerke II

The M50 manifold and the 3.5 euro hfm with larger injectors and software. thats the best recipe, the larger throttle body really doesn't make more power. A more free flowing exhaust would also help.

Thanks. I will keep that in mind.