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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 06-23-2012, 04:04 PM   #221
Jim Murphy
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Originally Posted by TxZHP04 View Post
At this point, why not just wire up an LC-1?
I guess it is because I would rather it be truly emissions legal.

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Old 06-29-2012, 12:58 PM   #222
Jim Murphy
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The cats are installed, passed emissions test and now it is a little quieter than when it had no cats along with a lighter checking account . . . sigh.

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Old 07-02-2012, 10:05 AM   #223
Grande D
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The cats are installed, passed emissions test and now it is a little quieter than when it had no cats along with a lighter checking account . . . sigh.

Jim
That really sucks man.

Your willingness to jump in is not lost on me, I appreciate the fact that you were willing to give these a try!

Last edited by Grande D; 07-02-2012 at 10:06 AM.
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Old 07-02-2012, 01:44 PM   #224
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That really sucks man.

Your willingness to jump in is not lost on me, I appreciate the fact that you were willing to give these a try!
The tuner is telling me that this particular ECU (late E46) is the most complicated one of the E46 models including the M3; thus, tuning is a challenge. This shop does a lot of FI work on BMW, MB and Porsche.

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Old 07-03-2012, 07:27 PM   #225
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Yeah, for whatever reason, MS45.1 appears to be a particular pain to work with.
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Old 07-04-2012, 08:42 AM   #226
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The tuner told me that this particular program is way bigger in size than any other one and has a multitude of controls that the others do not have.

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Old 07-27-2012, 07:36 AM   #227
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http://www.schmiedmann.com/3_series/...ge19.htm#17923 cheaper and better , i made 215hp just with these an cheap intake and a tune,greets
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Old 07-28-2012, 07:10 PM   #228
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http://www.schmiedmann.com/3_series/...ge19.htm#17923 cheaper and better , i made 215hp just with these an cheap intake and a tune,greets
One of many available options. Those would not be strictly OBDII legal in the US nor would they be legal in racing classes requiring cats in the stock location. That was the whole point of the OP, headers which keep the cats in the stock location (for the US market).
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Old 09-17-2012, 12:08 PM   #229
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Just burned out the new rear replacement cat. Going to straight pipes except when it is time for emissions test, run cats, pass emissions test and then back to straight pipes. Sheesh . . . . .
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Old 09-17-2012, 09:47 PM   #230
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Something isn't right. Do you have current dynos showing AFR?
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Old 09-18-2012, 09:48 AM   #231
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Buckhead Import Performance is who found the Magnaflows burned out and clogged up. They were replaced a couple of months ago. Later, one PDX at Road Atlanta (two 20 minute sessions with the motor idling after each with the hood up to cool down), is where I am now with a clogged up cat.
Buckhead has installed and maintains dozens of German FI cars of all levels of prep. They have found out that track time wears out cats at a much accelerated rate - one year life versus 5+ years.
Thus, their solution is to have two short sections - one set with the cat's and one set with either straight pipes or short (same length) mufflers for better sound control. Install the cat's for the annual emission testing and then replace them with the straight (muffler) pipe for the rest of the year. Dozens of their customers have done this with 100% success. Buckhead says that all my problems go back to clogged/burned-out cat's that they were trying to fix with software programming to no avail over all these months.
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Old 10-19-2012, 03:57 PM   #232
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One of many available options. Those would not be strictly OBDII legal in the US nor would they be legal in racing classes requiring cats in the stock location. That was the whole point of the OP, headers which keep the cats in the stock location (for the US market).
Those Schmiedmann parts are not necessarily better. There is an austrian guy who runs these parts in his 323 (forced induction) -> cats burned out. Schmiedmann told him that these cats arent made for FI cars.
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Old 10-19-2012, 04:54 PM   #233
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Those Schmiedmann parts are not necessarily better. There is an austrian guy who runs these parts in his 323 (forced induction) -> cats burned out. Schmiedmann told him that these cats arent made for FI cars.
You're a little late to the party but that's interesting feedback none the less. I also never stated or implied anything about whether they were a better option with or without FI. Someone else brought them up and I was merely pointing out that they are not emissions legal in the US and that they didn't fit the topic of this thread.
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Old 10-20-2012, 08:55 AM   #234
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You're a little late to the party but that's interesting feedback none the less. I also never stated or implied anything about whether they were a better option with or without FI. Someone else brought them up and I was merely pointing out that they are not emissions legal in the US and that they didn't fit the topic of this thread.
Sorry mate - quoted the wrong post. I meant to quote "diederik" who wrote:

"cheaper and better , i made 215hp just with these an cheap intake and a tune,greets "
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Old 09-03-2013, 09:44 PM   #235
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hello, I am a bit late on this post. None of the less, the information here are very useful. Considering my 330i is not forced induction, I think I'll go with the Schmiedmann route with their header & section 1 setup, and keep my SuperSprint muffler.
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Old 04-29-2014, 04:45 PM   #236
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I noticed that Magnaflow changed the design of these headers, apparently as of April. The new design looks just like stock manifolds, with that saucer shape at the collector. I emailed to inquire about the change, but their tech line specialist didnt have an explanation, only to say "I am guessing either a fitment issue or the flow is better this way."

I think I'm reaching the conclusion that the stock BMW manifolds, regardless of how they look, are probably really quite efficient.
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Old 04-30-2014, 09:13 AM   #237
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I noticed that Magnaflow changed the design of these headers, apparently as of April. The new design looks just like stock manifolds, with that saucer shape at the collector. I emailed to inquire about the change, but their tech line specialist didnt have an explanation, only to say "I am guessing either a fitment issue or the flow is better this way."

I think I'm reaching the conclusion that the stock BMW manifolds, regardless of how they look, are probably really quite efficient.

Not only NO, but H--L NO do the OEM headers flow better!! I have no idea why Magnaflow went backwards on their design. The issue with the better (now old) design is that they flowed so well that they BURN out the cats in a couple of months. With me, I replaced the Magnaflow cats once, they burned out yet again so I went in a different direction. I replaced the burned out cats with 3 straight tubes thus making them into an aftermarket-looking header. Then I replaced the way-too-loud (busted by the police) UUC DS3(?) twin pipe exhaust system as it, too, was never designed (per UUC) to run behind a header (I could not stand the loud noise). I bought an all Magnaflow single 3" exhaust system with one straight-thru resonator, one offset muffler behind the axle and chrome tip. I installed a single cat behind where the two header pipes come together (Magnaflow Y pipe) with a quick change arrangement so that I can run a straight-thru muffler in place of the cat until I need my emission inspection. Total cost for the whole Magnaflow exhaust, less the cat, was about $500 delivered (plus labor). About 1/3 the cost of the UUC DS3 exhaust since it is a single not a dual pipe arrangement (with 2 of everything). I now have a much quieter but nice sounding exhaust. IF I ever decide to make it even quieter I will just add another muffler because I have room to do so.
I do vaguely remember that I have a separate thread on this topic in this forum.
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Old 04-30-2014, 09:31 AM   #238
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Old Yesterday, 07:36 PM   #239
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Found this article from the truck world. Wish they could provide similar flow metrics for our application but this does seem to suggest that the Magnaflow units could flow a little better than stock.

http://www.sporttruck.com/techarticl...ers/index.html
Thanks for the link. I think i'm going to go with these
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