why obd2

[Mr_Efficiency]

Every were else i go I'm told to stay away from obd2 cause of all the extra sensors and crap to deal with, anti theift etc and AFAIK they are not as tunable as obd1.

so why is everyone swaping to obd2, whats so great about it over obd1?

I always thought obd1 was better for ease of tuning and less complications.

also how would obd2 handle boost?

[korbendallas68]

OBD2 just has more after-market tools that are used for tuning. Maybe they also have more options available in the ECU for different setups?

I've been toying around with the idea for swapping OBD2 into a 94-95 GAGT (Since they un-tunable ECU's) for a while now, more or less to see what I can do with it.

[Mr_Efficiency]

I knew obd2 was better managment wise, faster and more acurate with more senors but i didnt think it was tunable really at all without a reflash and i thought only GM could do that. I've been searching around this site and see that it is a lot more tunable than i originally thought but nobody really goes into any depth as to how to tune it or what they are using and what its capabilities are.

[bszopi]

Options are DHP PowrTuner (no longer supported) and HPTuners. Do a search for those and you'll find alot more info.

[geldartb]

there used to be DHP for an option to tune, but unless you buy a unit from someone thats selling there old one then your out of luck on that.

theres also HP tuner for tuning OBD-II they have alot more vehicle support

[korbendallas68]

I also find it's difficult to find the proper OBD1 ECU's in junkyards for custom setups, but OBD2 systems are everywhere.

[geldartb]

the obd=1 based cars are getting few and far between. just in the last 3 or 4 yrs ive seen more mid 90's and up cars.

[IsaacHayes]

And like said above the 94-95 are unsupported and so we go to OBDII to tune. We can't go back to older ECMs cause usually us 94-95 have electronic trans and the older ECMs don't support them.

[Mr_Efficiency]

And like said above the 94-95 are unsupported and so we go to OBDII to tune. We can't go back to older ECMs cause usually us 94-95 have electronic trans and the older ECMs don't support them.

that makes a lot of sence, with obd 1.5 your kinda screwed for tuning cause there is nothing at all.

what benifiets do you get from a complete obd2 swap over obd1?

I was searching around and saw that with this swap you can get all the features newer cars have like keyless entry and even air bags if you'd like. Also if you swap out the door locks you get the one key that does the doors and igniton, that would be kinda nice. any other luxuries you inherit or tuning bonus's?
thanks

[sprucegagt]

I knew obd2 was better managment wise, faster and more acurate with more senors but i didnt think it was tunable really at all without a reflash and i thought only GM could do that. I've been searching around this site and see that it is a lot more tunable than i originally thought but nobody really goes into any depth as to how to tune it or what they are using and what its capabilities are.

The reason why nobody goes indepth on how to tune with OBDII is its simply much more involved than OBDI. You really can't make a few threads and have it cover all of OBDII tuning. Both DHP and HP have there own forums covering this subject and they are both still learning how all the various tables work and interact with one another. It's still an ongoing science.

[geldartb]

like spruce said tuning OBD-II is a very in depth process. your never done learning when dealing with tuning on an OBD-II car.

i spent the better part of a week tweaking shift point and converter lockup points to get them good, and now i get to start all over with tuning beacuse of the new cam and engine work but hey its all in fun.

[Mr_Efficiency]

how does obd2 take boost? its the same as obd1 right, need to program a 2bar map and all that correct?

[sprucegagt]

Depends on the car your tuning. You can't just add a 2 bar MAP and expect it to work. Instead the car your tuning must of already had a 2 or 3 bar MAP in it's stock programming. DHP tried giving the option to people to add a 2 or 3 bar MAP but it didn't work. When you reached max boost the PCM would reset it's startup barometric pressure (i.e. normal atmospheric pressure) as the boosted pressure. Thus it would screw up all your tuning. HP has mentioned on it's forums that it would not do any 2 bar conversions for the V6 market. There are simply too many BIN file variations for them to justify the time spent making software updates to make the MAP adjustments available. So right now, nobody has a viable 2 or 3 bar MAP conversion available.

[Mr_Efficiency]

ok I'll stick with obd1 then, lol i understand it a lot more and i can run a 2 bar map