BMW M3 and BMW M4 Forum - View Single Post - F80 M3 / F82 M4 Piggyback Tune Summary Table

hoobawhat? · 05-25-2020, 04:50 PM

Quote:

Originally Posted by pigwet

*TABLE*

Help complete the table!
https://docs.google.com/spreadsheets...it?usp=sharing

*SUMMARY*

Tunes that only access MAP/TMAP sensors (BMS Stage 1, BMS JB4 set to MAP 1)
--the simplest approach
--without access to RPM, it can only supply a constant increase in added boost for all RPM, in this case +4psi
--the car will get cranky at some added boost level (greater than +4psi or so = +40-50 whp) and the HP gains are limited by this

Another group that accesses MAP/TMAP/CAMSHAFT (Vivid, Turner, Tuning Tech, Active Autowerkes)
--access to RPM through CAMSHAFT gives ability to adjust boost with RPM

Another group that accesses MAP/TMAP/CAMSHAFT/MAF (DTE/ESS/ & maybe Velos)
--access to RPM through CAMSHAFT gives ability to adjust boost with RPM
--the MAF gives them the ability to avoid some potential codes a higher boost levels
--the MAF also reportedly gives the ability to improve shifting smoothness

One tune that accesses MAP/TMAP/Fuel Mass/Wastegate and CANbus (BMS JB4)
--this gives access to all of the above and much more
--enables ability to do fancy things like switch maps from steering wheel and open exhaust valves
--enables data logging capabilities
--enables much higher power tunes/mods including methanol and larger turbos
--includes a code reader & clearer
--the 1st map is very simple additive +4psi map and does not require connecting to CANbus (called STAGE 1)
--the 2nd and 3rd maps are still additive maps but +psi varies with RPM, requiring connecting to CANbus (called STAGE 2)
--the 4th map is for diagnostics
--the higher maps are riskier absolute (not additive) maps meant for higher octane fuels, larger turbos, etc. (called STAGE 3)
--the higher maps may require connection to wastegate and fuel mass sensors

And finally the DINAN
--rather than plugging into individual sensors, it plugs directly into the MDE/ECU which is below and in front of the intercooler
--only 14 or so wires are intercepted, so not all wires going into ECU are addressed as stated in their videos
--not clear how this approach differs from BMS, but it is more difficult to install and only a qualified installer/dealer can do it
--comes w/o firmware loaded, adding time to installation

From what I gather, the BMS JB4 offers everything the DINAN may someday offer for the F80/F82 - but currently the JB4 offers significantly more tuning and data logging options than any other tune.

Wow, thanks for taking the time to post this! Very helpful indeed.