Mail In Tune / Long Tubes Question
I think I said that a few posts back... You are going to have to KNOW what codes, sensors, and systems do what in order to properly mod your programmimg. I seriously recommend knowing all this even if you farm the tuning out to a shop or mail order.
If you know what that particular sensor or system does, then you will know exactly what to expect when you mod that parameter or bypass it altogether in your programming. In our Fbody cars the second inline O2 sensor simply lets the ecm know if the cats are operating within parameters. They do not do anything else. They don't precede changes to your fueling, timing, or anything. So precluding thier imput only prevents the ecm from turning on the SES.. nothing more. The SES light is still operational and will let you know of other dtc issues should they arise.
It is also possible to change the parameters that the ecm uses to detect issues. I.E. reducing the sensitivity of your knock sensors so that they don't pick up the coldstart rattle of forged pistons and mistake that for detonation and send a dtc for it.
I don't recommend messing with your knock sensors unless you know exactly what you are doing with your mechanical timing events. Our LS engines are designed to run right on the edge of detonation and the knock sensors are the last safety net. Reason I'm saying this is a lot of guys don't dig having thier timing ecm retarded and losing power because thier other mods are setting of the knock sensors. But the alternative is a shelled out engine.
If you know what that particular sensor or system does, then you will know exactly what to expect when you mod that parameter or bypass it altogether in your programming. In our Fbody cars the second inline O2 sensor simply lets the ecm know if the cats are operating within parameters. They do not do anything else. They don't precede changes to your fueling, timing, or anything. So precluding thier imput only prevents the ecm from turning on the SES.. nothing more. The SES light is still operational and will let you know of other dtc issues should they arise.
It is also possible to change the parameters that the ecm uses to detect issues. I.E. reducing the sensitivity of your knock sensors so that they don't pick up the coldstart rattle of forged pistons and mistake that for detonation and send a dtc for it.
I don't recommend messing with your knock sensors unless you know exactly what you are doing with your mechanical timing events. Our LS engines are designed to run right on the edge of detonation and the knock sensors are the last safety net. Reason I'm saying this is a lot of guys don't dig having thier timing ecm retarded and losing power because thier other mods are setting of the knock sensors. But the alternative is a shelled out engine.
