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Don't most traction control systems work through the ABS system?
Here's my take, you want an open ECU/harness/sensors, It's a 5% wieght penalty.
I agree, the current ECU rule is silly. Make people spend more money just to meet the letter of the rule. It's almost exactly like the old shock rule. But, people wouldn't do it if there were real gains to be had. Opening it up makes it accessible to those w/o the huge budgets. However, there are still gains to be had that some can't take advantage of (CIS folks, carb folks, etc). I have no problem w/ letting people do it, just that it will cost them (in terms of lead).
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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. Otherwise you're stuck with a system that runs lean, and won't make any more power than stock. My system has like 10 or 12 programable points in it where you can adjust the injector pulse width. What winds up happening is they're bunched around the low to mid RPM range where the fuel curve in non-linear but when I'm running the car I'm pretty much in the linear band above 3500rpm, actually I can keep it in the 4500-6500 band pretty much all day long, it's just getting into that band when starting out where it becomes nice to have a decent working system. I drove the car once on the default setting, and it was too fat at idle dumping gas down into the oil, the vanos would kick in and it'd be way too lean and die out. Only when moving could I get through above that range and then it'd straghten out and run right. This is just to get the motor functional.