LT1-LT4 Modifications 1993-97 Gen II Small Block V8

obd1 to obd2

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Old 04-15-2009, 11:15 PM
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Default obd1 to obd2

im doing a motor swap in the next few weeks and need some info/help.

heres what i have: 93 lt1( bolt ons) a4, 3:73 (rite now)
im switching to another lt1 out of a 96 vette, i have the hot cam installed and have ported heads and intake. i want to spray the car (100-125) but i want to have the car tuned before i do that. has anyone ever heard of switching out the obd1 to the obd2 to make it tunable? if not the only thing ive heard is pcm for less doing a burnt chip and i dont really trust there judgment on the correct tune for me spraying a 125 shot. anyone got any suggestions?
Old 04-15-2009, 11:57 PM
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Just leave it obd1. I actually went from obd2 to obd1 for the ease of tuning with tuner cat. What software are you wanting to tune the car with? I would stay away from LT1 edit but thats just my opinion.
Old 04-16-2009, 07:03 AM
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You might want to swap from a 1993 computer to a 94-95 version (still OBD-I). That would make it a little easier. You would have to swap engine harnesses and IAC (or change the connector). There might also be some other wiring changes that need to be addressed.
Old 04-16-2009, 07:04 AM
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Originally Posted by WH97Z
Just leave it obd1. I actually went from obd2 to obd1 for the ease of tuning with tuner cat. What software are you wanting to tune the car with? I would stay away from LT1 edit but thats just my opinion.
I think the detail you are missing is that he has an older style OBD1 which has burnable chips as opposed to the 94-5 flash OBD1, single wire O2s and no MAF.

I can see wanting to do this swap. Remember to keep the hub and balancer from the car because the Vette accessory depth is different, just use your Camaro pieces and pull the timing cover so you can remove the CPS reluctor, it affects hub depth.

The 93 and 94+ fuel rails are different as are the intakes to accomodate the different fuel rails, I am sure you can make either setup work just be aware of it going in.
Old 04-16-2009, 04:28 PM
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i actually found a guy in columbus that said he can tune the obd1, but from what you guys were saying there is two different styles of obd1. hopefully he can come through but ill keep my options open
Old 04-16-2009, 04:46 PM
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Originally Posted by shbox
You might want to swap from a 1993 computer to a 94-95 version (still OBD-I). That would make it a little easier. You would have to swap engine harnesses and IAC (or change the connector). There might also be some other wiring changes that need to be addressed.
What I did
Old 04-16-2009, 05:02 PM
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Originally Posted by cgroh89
What I did
how difficult was that to do ?
Old 04-16-2009, 08:27 PM
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I was told that the obd-1 cars even 95s(which is what I have), are untunable. Is there any shops that still do obd 1 tuning? Or is it in software that you can buy?
Old 04-16-2009, 08:29 PM
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Originally Posted by dirtynorth
I was told that the obd-1 cars even 95s(which is what I have), are untunable. Is there any shops that still do obd 1 tuning? Or is it in software that you can buy?
This is completely and utterly the most false thing I've read in awhile. OBDI cars are preferrable to tuners because of the ease of tuning them. Any competent tuner should be able to tune given the software.

You can buy the software, but I do not recommend trying it yourself without experience. Programming is not for novices.
Old 04-16-2009, 09:15 PM
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Originally Posted by RamAir95TA
This is completely and utterly the most false thing I've read in awhile. OBDI cars are preferrable to tuners because of the ease of tuning them. Any competent tuner should be able to tune given the software.

You can buy the software, but I do not recommend trying it yourself without experience. Programming is not for novices.


exactly why i wont do it.



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