A friend of mine was telling me that any of the bolt on mods I have on my S2k (CAI, Header, etc) are useless because the computer is OBD2 and will simply adjust the car to counter act the modifications and keep it's stock setting. Is there any truth to this, and if so are there any aftermarket computers out there to get around this?

 

There are certain things that the OBDII ECU will do to compensate for air / fuel changes, but I disagree with the generic statement. The S2000 is hard to improve much, just because it is already pretty tweaked. The benefits of replacing the ECU are more than just this. There are aftermarket ECUs that will bypass the OBDII sensors and have optimized fuel and timing maps(Mugen, Spoon, etc.), and there is a fully customizeable ECU made by AEM.

 

putting on a VAFC and adjusting A/F at closed loop is overcome by computer since it is trying to maintain a specific ratio.

other mods help keep the engine in an optimum range, and the computer does not have to correct a condition.

for instance, with my SC at full boost on track the other day, my IAT was up in the 140's and 150's, which makes the computer adjust the timing. with an aftercooler, temps would be MUCH lower and the computer would not have to adjust to keep things in a safe range.

keith

 

I installed a AEM computer and got 13 hp at the wheels..