I want to convert to obd I for 2 reasons.

1. I want to tune the car and my local dynotuner can only do obd I LT1 cars.

2. Apparently my o2 simms went bad so I'm throwing a code and now I have the common egr code since I'm running headers with no cats. I've heard obd I computer aren't as sensitive to the egr parameters are obd II computers.

So it all sounds good, and I'm planning on picking up an obd I conversion, so I can swap back to obd II without a hassle if needed. However, are there any negatives to going to obd I? I know there are more sensors on obd II cars, but are they negligible or would it be worth just finding someone that can dynotune an obd II computer?

Finally, is it even worth getting a dynotune? The dyno tune is $350. Is it worth dynotuning a bolt on LT1 or should I just go for a mail order tune from madz28?

 

If it's merely to get a tune, go somewhere else. If all you have is headers and a cat-back, its up to you if you want to pay $350 for a few extra horses.

 

zero neg effects besides maybe stall wall. but that can be programmed away

 

Mine has been converted to OBD1 for several years now...I haven't found a downside yet, so I have no regrets

 

Converting to OBDI does have its advantages, but for the two reason you have listed, I don't think it is necessary. I had a sim go bad on me, I just bought a new one. As for the tuning issue, there are plenty of tuners who have no problems tuning an OBDII style LT1 PCM. For just bolt-ons, a dyno tune is not worth the money. But if you are looking for a mail order tune to add some extra power and get rid of those rear 02 codes, then a tune with Madz28 is not a bad route to go.

 

Only bad thing I can think of is if you live in an emissions conscious area you will immediately fail and will have to find a way to pass under the table. Regardless if your setup is emissions friendly or not you will not pass.