Another John Gemi chip thread

[BMW Bomber]

I have to agree with Sproggy , maps are as I understand them , just a set of values that are not able to be modified, the chip would be read only . Mototronic isn't very sophisticated, it doesn't learn and modify the values, poor fuel is another thing entirely.
But I'm happy to learn otherwise if someone can shed some further light .

Really appreciate the input though, this is only my second bmw , last one was a r1100rs se bought it with 105k on the clock and battered it around Europe to Slovenia with a load of lads with far faster sport bikes , 5500miles in a fortnight, kept up and I could still walk at the end of every day when they couldn't haha .... It was brilliant.
The bike and the ride

Would like my GS to have something like the same power .

 

[Comfy Old Boots]

A few years ago Roger04RT proved the chips at the time via monitoring the output of a wide band lambda sensor that the the initial enrichment after a couple of hundred miles reverted to stock AFR as the ECU compensated. I seem to recall he detailed and discussed his findings on the old forum.

At the time I seem to recall he refused to accept proof his chips were short lived. Maybe he cracked the coding but I went afxied after trying one.

Roger. Wow. That dude was something.

All I know is the other dudes chip transformed my r859r. #barbera. Last bike I named.

 

[ThreeDawg]

You wouldn’t expect any performance remap to a system as crude (by modern standards) as the injection on an 1150 to still cope with crap fuel. There’s a reason why there’s a CCP to go with the standard chip to switch to a map for lower quality fuel - it’s not clever enough to detect it automatically. An aftermarket chip or remap that pushes the limits of fuelling and ignition timing a bit more than standard won’t offer that.

Interesting. I have heard of the different coding plugs - does this apply to non cat no lambda 1100s? I had never had the problem before, but then again I had not run the bike in such extreme conditions on such crap fuel.

 

[AnotherGSGSGS]

No complaints from me - I’ve done a few thousand miles with my JG chip and it’s as effective as it ever was. A custom map in a chip can’t “revert to stock”. The custom map doesn’t just enrich the mixture either as you seem to imply.

Are you sure you’re not confusing replacement chips with the far more crude ‘fuel enrichment devices’ that sit outside of the ECU? Maybe you could post a link to the ‘proof’.

No I'm not! I know the bloody difference. I fitted a gemi chip myself for a while but removed it to run an afxied so I know which is which.

I can't be arsed to go and refresh my memory now on exactly how the Bosch ecu works with base fuel maps and trims but if I recall his chips had their own base maps but ecu would apply the long terms trims when on closed loop referencing the lambda sensor to mitigate the increase in fuelling from the gemi map by applying the trims.

Believe what you like about what youve bought but Roger provided hard data to prove the trim was real. It was also very clear it wasn't just Roger had beef with Gemi and was just attacking him. Gemi couldn't answer robustly to explain Rogers questions. I seem to recall gemi and Roger debated this over many pages on the old forum.

Like I said maybe he figured out how to mitigate the long term trims.

 

[Wrigsby1]

Yeah, after two or three tanks the benefits of the chip seem to disappear in my experience - really noticed this after putting the bike back on the road at the beginning of the month (battery was disconnected over winter). Pity, cos it's bloody lovely while it lasts.

Roger04RT reckons the Motronic learns that something has changed and correct things, although this might be debatable with open loop non cat bikes.

I've just changed mine back to standard today as my bike disgraced itself in hot conditions with low octane Bolivian fuel - I suspect that the Gemi chip couldn't cope, but I may be wrong but I don't want it happening again.

The theories on this was very well covered in lengthy previous threads, especially by Roger04RT... The equivalent XFID or whatever was a more complex change and doesn't seem to be available any more...

The part about open loop bikes is not debatable as without a Lambda the bike cannot self adjust. It's a fixed set up as is...