I've been looking at some mail-order tuning options and I am begining to think that an OBDI conversion may be the best route (after I get all the inspection crap out of the way ) PCMforless claims a 5 to 7 horsepower advantage over OBDII tunes, can anybody verify this? What are the downsides to doing the swap? Are there any?

 

I just did this to my car. You can either modify the OBD1 pcm by soldering a resistor in it, or you can put it in, and change to the 94-95 knock sensor in the right side of the block. The only negatives I have heard for the manuals is that you have a reduced amount of information to diagnose problems with the engine. Then you can buy a cable and pay the $75 for an email tune and upload that, or download datamaster and tunercat, see if you like them, and if you do, buy them and have fun tuning it yourself. I think it's fun, but then I am a computer geek as well. A cheap laptop would also be needed if you don't have a friend with one you can borrow.

 

How does the OBDI differ from the OBDII?

 

So the knock sensor(s) are different?

 

From a technical standpoint seems like a step backwards. Maybe cheaper for tuning programs. I dont think cheaper is always better though.

Good luck

 

I don't know about the cost of Tuning Programs.. you would think that they would be similar since they are a LTX..you just play with the extra Tables.

 

This has been posted many, many times. You don't have to change knock sensors or solder anything in. Just shut off code 43. The knock sensor will still function normally.

 

Sweet... I'll go for it!

 

I replaced my knock sensor, and my tune is a custom one from one of my dad's friends, but in the end i picked about .2 from my program.

 

Please forgive my stupidity, but what you're saying is that you can just change PCM's and then get the software and edit out the code? Seems simple enough I suppose...? And a helluva lot cheaper than LT1EDIT for OBD2...

 

That's all there is to it.

 

Tunercat and a cable is about $150 total, at most really, for OBDI cars. There was even a GP going on for the OBDI tunercat software here somewhere. You could probablly pickup the whole set for about 100 bucks with good shopping.

They sold their OBDII files to JET, who now markets them as JET Dynamic Spectrum Tuner, for about $500. Which is also about the same cost as LT1 edit + cable.

-Josh