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After-remap issues


ML350_Colin

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I have a 2017 M140i manual with a stage 2 map created by a reputable local company, a mst intake, and a decat downpipe. I had no trouble at all keeping the vehicle stuck in any gear before I got the map.

At approximately 140–150 mph (on private ground), I have a big backfire and plume of carbon dioxide out the rear, although this only happens when I hit about 5,000 RPM in fifth gear, according to the map, at which point it somewhat reduces in power before kicking in again.

The coil pack is good, and the NGK iridium plugs I placed have reduced the issue to a negligible degree, so I went ahead and installed them.
Has anybody ever seen this, or do you have any suggestions, or am I simply the victim of a **** map, or is it time to whack the head off?

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Just now, p00rmansp0rsche said:

As a general rule, if a map contains the word "stage," it is not a decent map.

Is that really the case? The stages often indicate the hardware needs; for example, a stage one usually doesn't need any further hardware, a stage two could need a stronger induction kit and a more free-flowing exhaust to get the most out of it, etc.

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1 minute ago, Alex1978 said:

Is that really the case? The stages often indicate the hardware needs; for example, a stage one usually doesn't need any further hardware, a stage two could need a stronger induction kit and a more free-flowing exhaust to get the most out of it, etc.

In my experience, this is the case the vast majority of the time. It is unfortunate because the consumer ultimately endures.

A vx220 that had been "stage mapped" by a specialist was, to put it mildly, abominable. I'll have to check to see if I have the graph from when we had it on the rollers; it is, to say the least, amusing. Boost was scattered everywhere.

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Recover your money by doing it yourself using the MHD phone app and files. They provide map updates on a regular basis, and you can simply switch from stage 1 to 2, 2 to 1, or back to standard at any moment, as well as have numerous settings like exhaust burble, always open exhaust flap, and so on. My 116i performs well with a stage 1 - 136 before reaching 200bhp. The flasher software costs £350, the stage 1 or 2 map costs £98, and the wireless obd interface costs £85 (it also works with diag tools like Bimmer-tool and Bimmercode).

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3 minutes ago, p00rmansp0rsche said:

In my experience, this is the case the vast majority of the time. It is unfortunate because the consumer ultimately endures.

A vx220 that had been "stage mapped" by a specialist was, to put it mildly, abominable. I'll have to check to see if I have the graph from when we had it on the rollers; it is, to say the least, amusing. Boost was scattered everywhere.

Before I got my C43, I had three Mk3 Focus STs, and I had mapped each of them to a "stage." Collins did all of my maps, and they were all spot on. My last one was mapped to stage 2 with all the hardware that goes with it. Didn't miss a beat. I think it depends on the mapper, just like in the OP's case. Some mappers are good, and some aren't.

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The OP was, in my opinion, fortunate. If the map had caused the engine to underfuel rather than overfuel, the explosion would have obliterated the engine in seconds.

If I didn't want to do it myself, I would have lost faith in the map and remapper and looked elsewhere.

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