i posted a while ago and didn't get much response. i know that obd1 is better for tuning. i've heard that obd2 compensate for your mods. how true is this really? has anyone dynoed an obd2 car in stock form, and then again with intake, headers, etc?

 

obd2 is bad because of emissions not its ability to cancel out mods. You cant really mod an obd2 car unless you live in an area that doesnt care about emissions.

 

Ask this question instead:

Has anyone ever modded their OBD2 engine and observerd the resultant changes in Long Term and Short Term Fuel Trim?

These are the parameters that add more fuel to the mix because the O2 sensor was telling the ECU that things were running a hair lean because of the additional oxygen being fed into the engine via a larger intake, for example.

So no, OBD2 doesn't cancel out mods but it is more strict in its approach for fuel and spark control with respect to modding the engine.

 

thanks chris. and i was asking about only basic bolt-ons. intake, headers, exhaust, etc. so i guess the obd2 will still yield gains from these mods, but less of a gain? is that correct? whereas obd1 doesn't compensate? or it doesn't compensate as much?