Im qurious... Lets say that someone does a major engine-upgrade - Increased Airflow-in, Ported Heads, New Cams and so on, or maybe Turbo/Supercharges a 355 2,7 Motronic - Is it possible to remap/reprogram the ECU(both sides of course) after own specs in a 1995 355? Does the programmer need some specific codes to get acces to the boxes? Kimmo/Sweden.
There's some very informative threads on this very issue in the technical section. It can be done, but it's an ugly process. Make a set of maps, burn EPROMS, install, dyno, remove EPROMS, develop new maps to address issues found during dyno, repeat. Unless you buy an already designed chip, it'd be more cost effective to go to a Haltech or Motec - at least you can tune in real time and you get more functionality such as traction control if you want it. The already designed chip must also have been designed for the same mods you intend to do. In another thread, someone said that the stock engine can be made to release a massive amount of extra power by replacing the EPROMS. There's no dyno sheets to show this, but Peter (aircon) in Australia has a 355 Challenge with a Motec that was extensively dyno tuned by the previous owner. He gets no more power than a stock ECU, and that IS on a dyno sheet. Simple fact is, unless you go crazy with cams to let the engine run to 10K, there isn't much power to be had unless you go forced induction. A 10K motor would also have, how do I say this politely.... engine wear issues? To quote the other thread, the "Big Bang Theory" is mentioned Forced induction on the other hand gets the added power without the stresses of increased RPM. Plenty of threads on this, and they almost all use Motec. Remember, it really is a small engine. To get 380 out of it stock is very impressive, especially with no variable cam technology. The same power to displacement ratio would see a 350 Chevy put out 620 hp. I doubt it would be good in traffic, nor would it pass emissions At the same ratio, a Viper would be 870 hp!!!
We do mapping for allot of different makes including Ferrari. A custom tuning for a 355 is very labor intensive, but it is possible to do.
But how much can the stock 2,7 motronic ECU be changed/remapped? Is it possible to redo the maps almost completely? Im thinking for those who Turbocharge these engines... Although a aftermarket system like Motec, Autronic, Haltec always is the best, but how are these systems compatible with the stock immobilizer for example? Is it possible to install a aftermarket fuel/ignition system, and still have the car for street, including all the electronics(electrical shocks for example) that play together with stock ECU??? Kimmo/Sweden.
I am pretty sure that the 2.7M system is not going to cut it for turbo applicaitons. It has too amny limits. This is a case for a piggy back ECU. Forced induction requires a huge range of operating variables and 2.7M isn't going to have the capacity for it alone. Look at it this way. The car is a 3.5 liter with a minimum operation of low rpm cruising (figure so much fuel and spark). At the other end you could ave the equivalent of a 7 liter engine at 1 bar boost with all its spark and fuel demands. So, how's 2.7 going to manage that range including fuel boost? Take a look at a Norwood turbo car. It is a major effort.
