How to check whether z4mc was remapped ?

R

Rombbb

Member
Hello,

Have a Z4MC and cruise control isn't working. I read somewhere that this could be due to a remap and the seller said that the speed limiter was removed so probably some kind of remap was installed.

I don't have an OBD device yet. Read that the most elaborate and cost efficient way is to simply get an old Win XP laptop and install some sort of free BMW software.

Besides reading fault codes will that also display aftermarket remaps ?

And should there be any, is it easy to simply flash back to the default ECU software ?

If it's only the limiter removed and if this is not causing the CC being diabled, then I'll just as well leave it be.

But if it's some broad ignition, fuel etc. 'optimization' by people who think they can substantially outsmart the BMW devs then I'd love to have that removed anyways. No need for instability just for the sake of 8 bhp more.

Thanks !
 
Not suggesting you do this but if you take it to the redline you should know if it has been messed with as usually they increase the Rev limit to 8200-8400 RPM.
 
Oeoeoeh, that's a daring suggestion :D

Not sure I can stomach holding it till the limiter, but then again, the engine is supposed to be built for it, so guess I'll give it a try.

Will report back
 
sport button usually ends up with memory function... so if you press it on, it will always be on as opposed to needing to press it again when you restart the car.
 
Beedub said:
sport button usually ends up with memory function... so if you press it on, it will always be on as opposed to needing to press it again when you restart the car.
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Thanks for thinking along

Will sport mode disable cc ? Pretty sure I tried cc after engaging and disengaging sport mode and cc didn't work, so probably that won't be it I guess.
 
sorry i may not have been clear, the sport button memory function is coded usually as part of a remap so if the sport button stays on after the car has been turned off id expect a remap to be in place... the sport button shouldn't have any bearing whether CC works on not.
 
Beedub said:
sorry i may not have been clear, the sport button memory function is coded usually as part of a remap so if the sport button stays on after the car has been turned off id expect a remap to be in place... the sport button shouldn't have any bearing whether CC works on not.
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Ah ok, thanks

I have to press it each time. When restarting the car the sport button light is off so I assume it's off then (unless a remap keeps it on without the led).

So that's at least one hopeful sign
 
The only way I know that you can see for sure if the car has a program is to copy the program with the right software and usb cable and compare it with a stock program for Z4M. Only your mechanic can do that and even him maybe be able to do not do it. The simple way would be to try going at higher revs (some programs remain at the same revs as stock), the sport button (some programs use the on off button like the stock), and the speed limit.
 
A bit creepy, but have you tried tracing the car’s history via forums, past dealers etc? There aren’t many Z4MCs and a remapper might well be a forum-goer.

Check for the phrases “massive difference”, “not more power, but better power” and “worth every penny”.
 
MrPT said:
A bit creepy, but have you tried tracing the car’s history via forums, past dealers etc? There aren’t many Z4MCs and a remapper might well be a forum-goer.

Check for the phrases “massive difference”, “not more power, but better power” and “worth every penny”.
Click to expand...

professional due diligence :rofl:
 
bradz said:
Check to see if the CC loom has been fitted... I wonder if its been fitted without the loom.
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According to spec sheet car was delivered with cc option, so theres bound to be a wire loom going from the cc stick to the computer. If all fails I will double check :-)
 
FD3S said:
The only way I know that you can see for sure if the car has a program is to copy the program with the right software and usb cable and compare it with a stock program for Z4M. Only your mechanic can do that and even him maybe be able to do not do it. The simple way would be to try going at higher revs (some programs remain at the same revs as stock), the sport button (some programs use the on off button like the stock), and the speed limit.
Click to expand...

Seller said that limiter was removed, just wonder if more was tweaked that might impact the cc. I will research and try to get software. Agree with you that its probably the best way. Intend on keeping the car for long so getting a bit handy with the software wont hurt. Want to be able to read error codes as well instead of paying big bucks for 5 min of work
 
MrPT said:
A bit creepy, but have you tried tracing the car’s history via forums, past dealers etc? There aren’t many Z4MCs and a remapper might well be a forum-goer.

Check for the phrases “massive difference”, “not more power, but better power” and “worth every penny”.
Click to expand...

Car came from germany so have to brush up on my german forum slang 8)

Good suggestion though, will give it a shot, maybe call the garages that serviced it. Wasnt anything on the bills related to flashing/chipping though. Although one garage charged 400,- for diagnostics, reading out the ecu to find a worn in exhaust camshaft that was replaced. Maybe they still have somthing in their log.

Off topic; that is a pretty freaky bill by the way, replaced camshaft, lifters etc. Car only has 50k miles, maybe because of the run in service that was not ticked in the booklet and maybe never done. Cant imagine buying a new bmw and not doing that 1200 mile service though
 
Sorry, but what does CC have to do with having a aftermarket tune? :tumbleweed: I have CC on mine, works fine and dandy, with the tune. Not sure who mentioned it, but unless you have your stock tune file, you have dramas going back, and you'll need someone worth Thier salt to get you back to a base tune.
 
Rombbb said:
FD3S said:
The only way I know that you can see for sure if the car has a program is to copy the program with the right software and usb cable and compare it with a stock program for Z4M. Only your mechanic can do that and even him maybe be able to do not do it. The simple way would be to try going at higher revs (some programs remain at the same revs as stock), the sport button (some programs use the on off button like the stock), and the speed limit.
Click to expand...

Seller said that limiter was removed, just wonder if more was tweaked that might impact the cc. I will research and try to get software. Agree with you that its probably the best way. Intend on keeping the car for long so getting a bit handy with the software wont hurt. Want to be able to read error codes as well instead of paying big bucks for 5 min of work
Click to expand...

I can feel you. When I bought the car I was super excited about it. Be careful about the software since not all the softwares can read the all the error codes successfully. Even if the software that you buy can read the error codes, you need a software which can "copy" the software from the ECU and then be able to open it, read it and compare it with a stock file. I believe that you will waste your money on that procedure. Just my 2 cents.
 
Rombbb when I got my Z4MR the cruise control wasn't working and bizarrely the fault seemed to be a poor connection where the supply voltage to the cruise control stalk connects into the fuse box behind the glovebox. Removing and reseating the connector pin sorted it out and I've never had a problem since. Just something else to consider, because I agree with consensus that the tune is unlikely to have anything to do with the cruise control ;)
 
Mangozac said:
Rombbb when I got my Z4MR the cruise control wasn't working and bizarrely the fault seemed to be a poor connection where the supply voltage to the cruise control stalk connects into the fuse box behind the glovebox. Removing and reseating the connector pin sorted it out and I've never had a problem since. Just something else to consider, because I agree with consensus that the tune is unlikely to have anything to do with the cruise control ;)
Click to expand...

Thanks will check that out !
 
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