doing it with ecus is not practical really. The controller for the nos solenoids needs to be specific.
Also, re custom maps, its like this...
there are no details as to where in the code the maps are.. they can be different even from revisions of code on the same model, and, almost always differ from model to model. The code is protected by mutiple diverse checksum routines to ensure code integrity. Not to stop you accessing it, but to enable the ecu to monitor for possible errors.
Even if you access the code (certainly possible) then you need to , not only find the maps, but to also decide what exactly the map is for as there is no set format. Once this is done, the changes need to be applied preferably on a dynomometer, the checksums recalculated, and then reloaded and tested. This is extremely time consuming and expensive. The software and hardware alone is about 4500 euro just for this, then the time and the dyno setup.. not really economically viable.
Nick.. If you had the rpm map, are you of the impression that this would offer more flexibility than the ramp time system ?
It would seem to me also, that linking to rpm is both logical and accurate. I belive the reason why commercial units do not offer this is one of cost and the aftermarket fitment of gear pos sensors only.
This would also allow several safeguards.. ie.. missed change cutoff, over rev cut off etc. The one I would like to have is nos based launch / traction.. certainly on my 172 is is easy to get a controlled start with minimum wheel spin, using nos would be a bit hit n miss or mean minimal delivery to assist traction. If one could link the nos delivery system to the abs wheel sensors, it would be possible to have a traction system based on nos alone?. FTGC could be used with the built in rev limiter if accurate enough too.
By using a simple data aquisition system from the abs sensors, it would even be possible to manually set the delivery to control the first sign of wheel spin in gear.. it would also seem possible to allow the system to operate in closed loop in learning mode.. ie.. you do a run and the system senses too harsh a delivery, it then tweaks the nos map for a fraction below this setting. this would basically allow a mapped to rpm to traction delivery system that is optimised.
The map would only need to be 1 layer.. not even 2d, as the nos deleivery would be based on WOT. in the lower launch gear, providing you can control traction without nos, then the system would also work.
it would appear that this would offer the max power delivery at all times and at all power points leading to a fully optimised system.
If one was to link that to pressure and temp monitoring, then the system could be fully self regulating.