Common rail diesel discussion thread

Holset

338

01-19-2020, 12:37 PM #81

Well shit should´ve checked spelling.. anyways how can you not consider something gold standart if you dont know it? Everything worth mentioning runs on BOSCH EMS. Also I think many people who buy your system eventualy come to some local tuner because they dont know how to tune it properly. I doubt you have time and will to remote tune each and every car you sold ECU for. So they come to that specialist he will look at it and tell them to go home. My first tought was the same. Big Grin

Here are some maps. First is Vorgluhzeit or preglow time. Second its injector calibration table, I think its much more logical this way. Third is Fahrerwunsch or Drivers wish, in your system thats fuel request. You see mostly it is only about maps being up-side down, thats no problem to fix. Second there are some acustomed maps names and abbreviations. Like predal is TPS and everyone knows it by this name, you tell them app and they think what application you talk about. So lets go one by one:

Fuel request: Thats called drivers wish and axis should be swapped for better understanding, other than that OK.
Fuel limit by MAP: Thats rauchenbegrenzung or Smokelimiter by MAP. You can have this table in MAF version if you use it, then airmass is used instead of boost. Swap axis, x would be boost from 0-1234, y would be RPM from 0 downwards to 1234.
Fuel limit charge air temp correction: This does not exist. Simple ECUs (even original MB EDC15) like this use Boost deration by IAT. Meaning its is basicaly boost limiter by measured intake temps. You lower boost not Iq (injection quantity) and thus trough smokelimit it will lower Iq itself.
Inection timing map: Thats ok, swap axis. It called SOI as in Start of injection. It should be labeled basic map since you have modifier on it.
There are generaly two ways SOI gets determined. It is either your approach or there are multiple SOI maps which are switched depending on water temperature. Thats easier to tune since you can copy it from working car. These modiefiers are hard to copy since there will be multitude of them at once and on diagnostics you only see final output.
Rail pressure map: Thats correct, swap axis.
Those other timing maps are OK, just swap axis.

Maybe I didnt looked enough but you miss Torque limiter map, or in this case Iq limiter map. This map sits above everything and governs Iq depending on Atmospehric pressure and RPM. It is mechanical engine protection. You can not do that good with just fuel request or smoke limiter. Iq itselfcould be in mg per stroke. Thats because you can more easily calculate AFR from mg of air and mg of fuel than mm3. Only Injector calibration table is in mm3 in newer ECUs. Exchange factor is mm3*0.8355=mg.

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Ex: 525tds 130kW, C250TD 160kW, E320CDI 200kW, ML400CDI 230kW, A6 R5TDI 130kW
Now: Q7 V8TDI 240kW, 320d 150kW, 335d 210kW

starynovy