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

OBD1 to OBD2 conversion

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Old 11-22-2007, 12:55 PM
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Default OBD1 to OBD2 conversion
whats all needed to do this? new computer and sensors? would i need to re-do the entire engine sensor wiring too?

I don't have crap for GOOD OBD1 tuners in my area, all have gotten into the LS1 tuning w/ the OBD2 stuff, I'd like to be able to use them to tune the car.

Any help is appriciated.

-Ben
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Old 11-22-2007, 01:00 PM
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OBD1 PCM and 93-95 knocksensor
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Old 11-22-2007, 01:05 PM
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Originally Posted by ckyconan2003
OBD1 PCM and 93-95 knocksensor

i'm converting FROM an OBD1 setup TO an OBD2


so just an tuned OBD2 computer and an OBD2 knock sensor is all i need? thats what i'm hearing.
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Old 11-22-2007, 07:06 PM
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you are correct.
OBDII pcm tuned for your conversion, a knock sensor.
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Old 11-30-2007, 07:23 PM
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Originally Posted by 96lt1m6
you are correct.
OBDII pcm tuned for your conversion, a knock sensor.
so just the knock sensor and a obd2 pcm?
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Old 11-30-2007, 07:33 PM
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thats what he said I'll let you know how it goes if i decide to give it a try.
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Old 11-30-2007, 07:37 PM
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yes.you do plan on getting a tune aren't you?
you need to have the CPS,rear O2's deleted from the OBDII pcm
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Old 11-30-2007, 08:59 PM
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Ain't there a crank sensor on the OBDII?
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Old 11-30-2007, 10:39 PM
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CPS? Actually this good info, I have the same prob. My buddy has HP tuners and we werent able to do anything with it because mine is a 95 also. So the wiring harness or nothing else needs replaced?
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Old 11-30-2007, 11:05 PM
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Originally Posted by Paul Bell
Ain't there a crank sensor on the OBDII?
yes,it needs to be deleted from pcm
its mainly for emission


Originally Posted by Transamthunder85
CPS? Actually this good info, I have the same prob. My buddy has HP tuners and we werent able to do anything with it because mine is a 95 also. So the wiring harness or nothing else needs replaced?
Crank Position Sensor
nope,no harness mods. you cannot use HP on these cars
Last edited by 96lt1m6; 11-30-2007 at 11:16 PM. Reason: my computer shut off (lightning out)
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Old 11-30-2007, 11:09 PM
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Hp Tuners WILL NOT work with an LT1 pcm. A swap to OBDII won't help you really at all.
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Old 12-01-2007, 12:43 AM
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BTW no one has mentioned the other wire you need to run from the Passenger kick panel to the ALDL
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Old 12-01-2007, 07:44 AM
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is there a scanner for obd1 that doesnt need a cigarette lighter? i was trying to scan and we had some fancy scanner that needed a cig lighter.
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Old 12-01-2007, 02:43 PM
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Originally Posted by bricez28
is there a scanner for obd1 that doesnt need a cigarette lighter? i was trying to scan and we had some fancy scanner that needed a cig lighter.
I use freescan on my laptop for my 94. I will be switching to Datamaster though. It still needs a cig. lighter if your laptop battery isn't very good.
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Old 03-19-2010, 12:01 PM
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Sounds like fun.
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Old 03-20-2010, 06:21 AM
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As far as I know you can only tune an OBDII LT1 PCM with TunerCat OBDII...which was sold to JET. So unless you can find someone with TunerCat OBDII the other option is to buy JET's software.

I talk with a lot of LT1 guys and finding a tuner who wants to touch an LT1 car is not easy these days.
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Old 03-20-2010, 06:41 AM
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Jet DST and LT1 Edit are your only two options for tuning OBD-II LT1's right now...
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Old 03-20-2010, 06:42 AM
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Originally Posted by 1bdbrd
I use freescan on my laptop for my 94. I will be switching to Datamaster though. It still needs a cig. lighter if your laptop battery isn't very good.
You need to check out Tunerpro RT V5 Beta. It works with LT1's now and has built in data logging. Much better than free scan, fully customizable. You can actually make it show more data than datamaster. No way am I paying for datamaster now that I have this.
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Old 03-20-2010, 09:28 AM
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wow...thread dug up from '07... at least people are using the search bar nowadays!
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Old 07-18-2010, 05:00 PM
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Yup we sure are. I have a 95 and it has an obd2 , which is better for tuning? I hear obd1 and others say obd2?
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