06-21-2012, 02:37 PM | #23 | |
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"... on the smiles-per-mile charts, the 1-series M coupe can't be beat. It is a challenging piece, a triple-X-rated driver's machine for semi-professionals. Its handling balance provides an open invitation to indulge in latent oversteer, and provides an opportunity to separate the men from the boys. It is an absolute hoot on the track and an addictive plaything on your favorite twisty back road. "
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06-21-2012, 10:22 PM | #25 |
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06-22-2012, 03:01 AM | #26 | |
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but when the valve is closed its very smooth and close to stock. It pulls very strong on mid range with good throttle response. |
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06-25-2012, 01:32 AM | #29 |
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06-25-2012, 05:50 AM | #30 |
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1M dumps
I replaced a mid pipe last week on a IM so i did a comparison of dumps looking from the dump outlet as we have many stock cats in stock
![]() I could not see any difference, the cat component looks the same as a stock 135/335 cat, i reckon the extra power comes from a better tune i guess time will tell. ![]() |
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06-25-2012, 07:24 AM | #31 | |
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Does the 1M have less restrictive high flow cats as OEM, as the actual 1M DP's are very similar to the 135i/335i. |
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06-25-2012, 08:26 AM | #32 |
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06-25-2012, 08:29 AM | #33 |
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Thanks Neil.... Yeh I have researched..
1M DP: No. Description Supplement Qty From Up To Part Number Price Notes Photo 01 Rmfd primary catalytic converter ZYL. 1-3 1 18307980403 02 Rmfd primary catalytic converter ZYL. 4-6 1 18307980404 135i DP: No. Description Supplement Qty From Up To Part Number Price Notes Photo 01 Rmfd primary catalytic converter ZYL. 1-3 1 18307553594 02 Rmfd primary catalytic converter ZYL. 4-6 1 18307553595 Just wanted to know, what was the actual difference in engineering.. Last edited by Zuzu; 06-25-2012 at 08:44 AM.. |
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06-26-2012, 02:40 PM | #35 |
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06-27-2012, 02:35 PM | #37 |
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I have been told by several buddies with N54 motors that running no cats smells BAD especially in traffic. I was going to go with cat free DP but after talking to them I am leaving them and just doing post cat 1 section back.
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06-27-2012, 02:55 PM | #38 |
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Although the direct injection engines run more efficiently you will still get the unburned hydro carbon smell, especially if you were just sitting in traffic. If you were to keep the oem mid pipes in place, the smell is cut down a bit.
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05-03-2018, 12:29 PM | #39 |
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05-10-2018, 09:47 PM | #40 |
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Well I don't sit in traffic much, but I still have a pretty good nose according to my friends that share wine with me and I have never smelled anything since putting in DP 4000 miles ago bearing in mind that still have the mid-pipe cat.
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05-17-2018, 10:16 AM | #41 |
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I have the MadDad midpipe and OEM downpipes (among other things, see sig).
When I asked MHD whether I should run stage 1+ or stage 2+ OTS maps, they recommended stage 2 for the 1M. On stage 2+ maps, at WOT power deliver is smooth and logs look good but above about 5k RPMs actual load is slightly lower than load requested. Part throttle is perfect up to about 60% pedal input, but I have power surges if I ask for anything between about 60% to 80% pedal input. This occurs on 91, 93 or 95 octane maps (properly fueled). Just yesterday I decided to shell out another $49 for the Stage 1 pack, and flashed Stage 1+ 93 Octane. So far it seems the surging issue is solved. My suspicion is that despite the 1M having better flowing downpipes/high flow cats compared to other N54 cars, they are not quite good enough for Stage 2+ power levels.
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05-18-2018, 11:34 AM | #42 | |
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I’ve crudely measured the mid pipe cats with a small piece of cardboard with a ruler drawn on and got 440cpsi. No hard data that I’ve seen. Mine are still visually the same as the mid pipe cats and still ceramic (I’ll measure them soon) but I estimate 440cpsi like the mid pipe cats. Something like a HJS Euro 4 is going to flow better for sure, and catless better again. Going fully catless on an N54 smells terrible though I would not recommend it. |
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