From M4 to M400: leaner !?

[Wolf_Tm250]

Is there any technical reason why the car now is leaner, changing from an M4 to an M400 with the SAME, just converted, map ?!

Thanks.

[JamieA]

The M4 and M400 are certainly not identical in either hardware or software, so there isnt any guarentee that you would be able to do a direct copy from M4 to M400. It shouldnt be too bad though, I would just play with the IJPU number increase or decrease it to change the overall fueling) until you get the tune to match what it was before. You may not need to retune the whole engine, as once you get the injector multiplier right again, it should be right across the engine. BUT I would alway recommend doing a check across the whole engine range after this change to be sure about it..

-Jamie

[Wolf_Tm250]

The M4 and M400 are certainly not identical in either hardware or software, so there isnt any guarentee that you would be able to do a direct copy from M4 to M400. It shouldnt be too bad though, I would just play with the IJPU number increase or decrease it to change the overall fueling) until you get the tune to match what it was before. You may not need to retune the whole engine, as once you get the injector multiplier right again, it should be right across the engine. BUT I would alway recommend doing a check across the whole engine range after this change to be sure about it..

-Jamie

Yes, sure...
thanks for the explanation!