So my 1996 USDM H22 Prelude is..well, OBD II. I've read some shitty things aobut OBD II, and I'm wondering if I have any major things to look out for, and also whether I should continue to modify.. i've heard the ECU for OBDII preludes resets like everything? Someeething along those lines, can't remember specifically..

but would anyone care to elaborate? And if you guys are search nazis.. I don't have the power to sort through 45,000 unrelated threads.

Thanks!

 

OBDII Ecu's don't respond as well to mods, but that doesn't mean they're completely useless. Main thing is that you can't control ignition timing, and that the fuel maps are constantly adapting to your driving style. Still, there are ways to get control of your OBDII Ecu (VAFC) and still make good power.

if you're interested, you can do an ECU swap to a OBDI ECU, like the p28/p73 which are from integras and civics with vtec. This is usually done so that you can use hondata, which is a fine piggyback system.

 

yeah obd2 will "detune your car" after it learns of your modifications to intake/exhaust
it will eventually retard timing and put your car back to stock figures after about 7 days of normal driving
so just reset ur ECU every 7-10 days and it will forget what it learned.