| There is many 1. O2 feedback with wideband sensors instead of narrow band
2. Boost control
3. Variable traction control
4. 2 Step
5. EGT feedback to adjust timing and fuel
6. Barometer to adjust fuel
7. Higher resolution sensors and more map points
8. Adjustable knock control
9. Fuel pressure feedback (ie if your fuel is dyning or dies) you can have it turn off high boost, set a lower rev limit or etc.
10. Logging most aftermarket ecus can log just about anything you want, some may want to not use the butt probe.
11. Switching from to MAP if you need to get rid of the MAF.
12. adjustable fuel temp feedback
13. adjustable coolant temp feedback
14. wideband sensor feedback in full
15. Nitrous control with all sorts of feedback
16. in general more failsafe conditions
17. Telemetry
18. GPS and sorts of other fancy stuff for track guys
19. Logging logging logging . I think that is the more basic reasons for aftermarket. The question do people really need it? Most aftermarket ECUs only do a basic amount of fault tolerance, fault response than that of a OEM one. But times are changing. You are looking at 2-3K for a good ecu setup. Which may not really be a good idea when a $100 would produce pretty much the same power levels. But an aftermarket ecu can not be just about additional power it is about additional functionality and most of that can be done by external boxes, like a racelogic traction control, boost controller and etc but none of those will trigger the ecu to respond if something is not behaving properly.
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