Not to start an agrument, but that isn't completely true ith respect to OBD-II being not highly modifiable. Might be true on the BMW OBD-II ECUs, but on my Lightning I've got complete spark and fuel control (and everything else like MAF transfer function, retard, and literally large numbers of parameters, some I have no clue about) in 100 RPM increments, using a hand held tuner and PC. Modify, change, download to tuner, then to truck. It is OBDII too, no check engine lights, and smooth sailing.Here's the misconception, the gains to be had with an OBDII car is simply what's avalible with a distributor bluprint and carb rejetting. The very function of OBDII is to be tamper resistant, only gutting the box and installing a MOTEC allows adjustment of mixture and spark.
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A lot of how tunable the car is will be related to the aftermarket size - lots of Lightnings being modified, so lots of options available. There are lots of OBD-II tuners with fantastic control for lots of other popular "performance" cars, but none in IT that I know of. As you say, I bet there isn't this sort of control for say, a 1989 Porsche 944 (OBD wasn't even around). Or a 2000 BMW 328i.
You'd definitely benefit from a Megasquirt, Wolf, Motec, Electromotive, etc. ECU it sounds like. As will a lot of other modern IT racers working with their newer cars.
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