

Run some engine cleaner through your fuel tank, throttle body and intake manifold (brake booster hose is a good entry for that).It's important to be sure that your vehicle and engine are mechanically sound before you begin tuning. However, it does not have definition file for OBDII cars ('96-'02), so you will only be able to tune '93-'95s. There is no VIN or individual PCM restriction with TunerCat, so you can tune multiple cars and/or PCMs without having to pay any additional fees. But without a laptop, you'll have no way to log your car while it is out on the road (necessary for real-life engine load and thus accurate spark timing & knock feedback). Of course, you'll also need a computer to run the program! A laptop is ideal, but not necessary if you can put a desktop & monitor close to your car's parking spot. 96-97 LT1/97-05 LS1: ECMPro Scan + enhanced GM diagnostics - for data-logging OBDII vehicles, will work only with the Jet DST or CATS OBDII Tuner kits.90-95 TPI/LT1: VEMaster for '94-'95 LT1s / VEMaster for '90-'93 TPIs/LT1s - for easy automatic tuning of VE tables.85-88 TBI: WinALDL - for older non-DataMaster-supported ECMs, not very user-friendly.

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92-95 LT1: FreeScan, as it is, like its name implies, free! It will save the log in the common CSV format, which can be imported into spreadsheet software or viewed with a simple text editor.
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These can be bought from OBD Diagnostics, Inc. Second, you'll need the appropriate cable connector to go from your car to a computer.
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Your other (free) option is to use EEHack for flashing and data-logging, and TunerPro RT plus the appropriate XDF (EE or DA2/3) for your PCM to do the tune editing. You'll also need an additional PCM file: $EE for the '94-'95 LT1/L99 $DA3 for the '93 LT1 F-Body or $DA2 for the '92-'93 Y-Body (Corvette), which will cost you an additional $19.95 from TunerCat. It is a great program, also known as Computer Automotive Tuning Systems (C.A.T.S.), which allows the above things to be done, all for only $69.95. TunerCat is your first step, the program I recommend to read your current PCM image, change its contents, and then reupload it to your PCM. There are three basic items necessary to tuning your own LT1 (or other GM) PCM:
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After payment, the 20+ page printable PDF of these free online tips will be emailed to you.
