I've seen this mod posted a couple of times in peeps sigs. Why do people do this? Just trying to learn something new.

 

Because ODB-2 is a lot more sensitive.

 

Because OBD II has more sensors such as misfire detection thru crank position sensor and secondary O2 sensors etc and OBD I doesn't, so if you have heavy mods and don't want to throw codes you put an OBD I computer in your car and volia no codes and it's probably easier for custom tuners to work with when doing a mail order or custom tune.

 

Because LT1 edit for OBD2 is freakin expensive and Tunercat (OBD1) is like $70 bucks.

 

Contact Ion Solton( Madz28.com) he will help you out... Unless you like a check engine light on all the time do the conversion .... Plus you can use datamaster for logging and you can upload your own programs with a laptop from companies like Ions... OBD11 you have to remove the computer and send it to a tuner to change the program... If you are going to stay stock and don't want to mod the car then the convresion would be a waste of time IMO...... Happy Modding

 

OBDI has Freescan (yes it's FREE) and OBDII has Autotap (~$450?). OBDI needs not O2 simms (~$20/side) if you remove your CATS. It's mainly a cost savings thing. I've heard OBDI is better for tuning some things but I'm not a tuner so I wouldn't know exactly what, I think it can handle slightly more airflow or something. If you have an automatic keep OBDII. I'm pretty sure the OBDI laptop interface cable is way cheaper too. Plus what everyone else already said.

 

you said keep obd2 if it's an auto, why?

 

If you go with a very high stall OBD1 processes slower and can become "confused" by the high slip and very fast acceleration and not shift right. My understanding though was this was not an issue with most TC used because most of us stay 2800-3500.

I run an OBD1 swap $100 for a cheapy laptop, $90 for Tunercat with the LT1 definition, $65 for a cable, $80 for Datamaster, and then a junkyard OBD1 pcm with $.20 worth of resistors and solder, all adds up to less than what JUST LT1 Edit for OBD2 costs and this is not VIN locked and includes an awesome datalogger. Just the swap and a cable would allow you to use email updates from one of the tuners that does such which is very nice otherwise with OBD2 you either spend $$$$$$$$$$$ on LT1 Edit for OBD2 so you can load or you have to mail pcm back and forth. If looking for basically a one time tune or infrequent updates with downtime being acceptable or you are willing to do the core thing Ion's OBD2 programming is VERY reasonable.

 

On this same subject, what is my OBD-2 PCM worth?

 

Its worth $70 US.