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Originally Posted by khail19
Why are only WRXs covered? I'm fairly sure my RS has the same ABS setup as the turbos, but it's not on the list. Weak.
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The reasoning is that the WRX 5MT has a slight change in the ABS programming to compensate for *the spare tire*. Apparently there were concerns about the ABS's reaction with the spare on, so they made some slight tweeks to the software in the ABS control chip.
When they tested the car, the stock ABS programming exhibited that 1 second delay on bumps/loose surfaces. When they tossed an STi ABS control unit, or any control unit that had the same Bosch firmware with out that WRX specific tweak, the delay issue went away. Essentially, the "fix" for the WRX is that it's getting the same firmware all the other cars already have.
I can only assume the 2.5RS and the 4EAT WRXs didn't have that tweek in the firmware, and therefore don't need this "fix".
I don't think this new ABS ECU is really going to suddenly turn the ABS from shit to gold, but it might help a little.