Tuning an Unknown ECU

Reply Subscribe

Thread Tools

Search this Thread

Oct 30, 2011 | 09:34 PM

72Cutlass

Thread Starter

Teching In

Joined: Jun 2006

Posts: 37

Likes: 0

From: Birmingham, AL

Tuning an Unknown ECU

I'm currently in the process of swapping in a LTX into my 1972 Cutlass. The motor came out of another car which was also a swap. I have the ECU and a swap harness, the computer is an OBDI. I have no idea if the ECU was reprogrammed ( I am assuming it is as to eliminate the VATS and Emissions related codes). The motor was running pig rich before I got it, I figure it was the tuning because upon further inspection of the motor it turns out to be an L99. I figure the previous owner had no idea the L99 existed, thought it was an LT1 and had it programmed as one. Even though I told it was an LT1 I'm not upset, I couldn't beat the price. I got the motor, swap harness, and a recently rebuilt 4l60E for free. All I had to do was take the day to pull it out

My question is what would be the best way to get this ECU programmed correctly? I am not afraid of tuning it myself (recent graduate of Mechanical Engineering so computers are my friends

) What programs would you suggest? Is TunerCat still one of the best for OBDI? I have used the search function but all the threads I find are who to use, not any suggestions on what parameters would need to be changed for a situation like mine?

Thanks for all your help!

Oct 30, 2011 | 09:45 PM

NewOrleansLT1

11 Second Club

Joined: Jan 2010

Posts: 1,707

Likes: 13

From: New Orleans, LA

A GM dealership can flash the L99 tune on to it. BUT I would not put that L99 into that car. Go LT1!

Oct 31, 2011 | 10:17 AM