General Category > General Discussion
Engine Remaping
Haakon:
In reply to WarthogARJ :)
That is a huge gain in max power indeed.
I was wrong in my earlier posting- when I said a map modification (and exhaust) never could do "much".
I mentioned new valvetiming and other drastic modifications.
I WAS WRONG and admit so ;)
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I had forgotten the history of my 2000 model F650GS.
When new my bike did not meet the Californan polution values.
It did raise its front wheel without even trying :-)
BMW tried to make it California legal and modified the map, they did not even ask- it was done at one of the free servicesl
We had all sorts of problems- they came with a new map, less problems but stll not axceptable!
Stalling and erratic running.
Last they came with the present map, it included a swap of injector too.
Bike running ok but it was way less responsive at low revs (no more front wheel lift unless you try HARD)
Leaner running, higher mpg- but a "lazy" engine.
My and others solution was to remap back to the first (poluting) map- and old injector.
BMW could NOT do that- probably because of legislations.
I know some owners of the 2 cylinder F800 bikes are experimenting with aother injector (and original map) with good results.
Haakon
marki_gsa:
If they replace the firmware I would bet on the diagnostic knowing therefore any engine and engine management warranty will be null. That said I am suspicious that this is the case. Re-writing firmware would be a massive job especially when it has to still talk to the rest of the bike. Replacing the map is far more likely and much easier to do.
There is typically a lot of snake oil talked about when it comes to ecu tuning, in fact tunning in general. Most of it comes from the guys that are actually doing it to add to the mystique.
WarthogARJ:
Hi Marki,
Well, I'm not really sure now what they do.
I was also a bit dubious about replacing the firmware.
I spoke to the guy who does it and claims he DOES replace the firmware.
I then asked him if there was actually enough memory to add anything more complex and he said yes.
And he does say he adds five maps instead of the existing one.
So that's definitely more than just a simple "re-mapping".
As far as warranty is concerned, nobody who owns an HP2 Enduro has any warranty left: at least I don't.
They made the last one in 2008.
I do my own maintenance: after having completely stripped it to the engine I'm not that worried about having to re-flash the firmware back to original if need be.
I know of quite a few other BMW owners, as well as other bikes who have had it done by these guys.
The local BMW service manager swears by them: says it makes a big difference.
I've seen the dyno-maps of before and after and there is a difference.
So I'm not so concerned about that now: I know it does make an improvement.
But I am definitely going to ask him about this "re-write" story.
I think he's just assumed I'm a normal rider who doesn't understand what's involved and is simplifying matters.
Thanks for your comment on this: good point.
Max at MaxBMW in the USA who has a lot of HP2 experience (he runs three big BMW dealerships and races HP2's) does a similar type thing of swapping out the map: I trust him and he says it makes a major difference.
He doesn't add any extra hardware.
I didn't ask him if he adds more than one map: I will.
The other option is getting an external processor like the Power Commander and optimizing things that way.
There are some case studies on this site showing the advantages of that.
Thanks for your comments.
Alan
Haakon:
The EPROM on my on (again) my old F650 is a Am29F040B chip.
512Mb only- The ECU will not accept the chip unless its all written to.
The map itself is only half that, give and take some.
Yes, my bike is extremely stone age but the only map do have- guessing: 8 to 12 different "under" maps.
No Lambda, no engine temp info, no intake temp, no barometric pressure, no TPS and so on- and all sorts of combinations.
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I am SURE the modern bikes have more than enough memory to store several main maps.
What I do not understand: How to change between the main maps?
If no additional hardvare is installed.
The "Power Commander" and other systems I understand- there you use software (or dipswitches) but then you install new hardware.
(New ECU..)
Haakon
StephanT:
I think it is a matter of misinterpretation, or misunderstanding...
I don't know of anyone who currently flashes the BMSK through the diagnostic port. They all do it by opening the ECU and reprogramming the whole flash with a BDM...
that means the whole flash is written... hence the "Whole flash is replaced"... but that does not mean the whole flash is new...
there will/could/should be a Copyright issue... but i don't want to go into that now...
best,
Stephan
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