Originally Posted by intenseblu
%20-25 long term fuel trim and %20-25 short term fuel trim ... it can only apply these adjustments to bring the idle and part throttle conditions to a 14.7 stoich burn. the final numbers are still applied to wide open throttle conditions but do not adjust based on wide open throttle air fuel ratio as the narrowband sensor is only accurate at 14.7...
and yes it would be possible to reprogram the ECU but at too high a cost and each build would have to be tuned as variances in what turbo was used or intercooler would affect tune required .... so unless a company makes a kit and has ECU's mass reprogrammed to be distributed with the kits then the cost would be very high. hell its going to be high no matter what you do for these cars ... so yes its all possible, how fat is your wallet ? how bad do you want it ?
LISTEN TO HIM GUYS... No Truer statement can be made about this issue ! Also, because the programming code is tightly held by MB and they only provide "basic maintenance tuning maps" to their aftermarket technicians. Also, because the OEM ECU software updates / changes often require two way communication with "big brothers's computers" it is very difficult to manilpulate the codes... I'm not saying it can't be done, because I know a programmer (Bosch ECU Tech) here in LA that can do it, but he charges $400 per hour and estimates that such a project would require multiple hours and multiple dyno runs with AFR logging... (appx. $2,500 worth of work) and he will not guarantee satisfactory results...
That is why I have scrapped my OEM ECU on the race car for the SRT6 engine swap and went with a MOTEC M600 system... It might be a little pricey ($4,500) without tuning, but it has the capability of handling any future modification I might put into the engine (eg. swapping the SC for TC, etc.)