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Originally Posted by nitrorocket
Boy, where to start!
Features over what F.A.S.T. does:
-Full 4L80, 4L60 transmission control
-Simultanious Closed/open loop control
-Auto tuning ability
-Torque managment ability
-Speedometer reading input
-Boost and nitrous control without having to upgrade
-Has much more advanced engine malfunction readings like individual cylinder misfires, knock retard conrols to eliminate engine damage from bad fuel, etc.
- Multiple fan on off control and fan after run features.
I cannot think of the rest but there are a ton more controls then you have with a F.A.S.T system. Bigstuff 3 has a lot of nice features though.
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That would depend on the stock ECU I guess. MY GTO computer didn't have many of those features; no nitrous or boost control, no trans control (had a separate computer for that), and no fan controls for off/on other than how fast it spins.... you could not change when it came on.
This was an LS2 and I know the LS1 does have fan controls. Never seen a factory ecu have a boost controller or nitrous setting though. The auto tuning comes from the individual tuning system you use to tune with (additional $500-$700 you need to spend so you can tune the stock computer).
One other consideration I had was full throttle closed loop operation with a boosted engine. The factory will not do that and FAST and Big Stuff 3 (as well as some others) will. Nice safety feature in my opinion as it can add fuel under WOT if needed to get to your target A/F (assuming your fuel mapping is within 25% of where it's supposed to be).
By the way, the FAST and BigStuff 3 have nitrous controllers; the BS3 also has an optional boost controller and trans controller.
Jody