Are You Ready to Tune?
This website is dedicated to helping you learn how to tune your own gen 2 LT1 car computer (PCM), using the popular and inexpensive TunerCat software as the model. But other software and computers are similar and you can apply the same logic with them.
Start with the basics, like removing the skip-shift for your six-speed, or accommodating larger wheels or different rear gear ratios you've installed.
Then we'll progress to altering the timing and fuel curves, to get better throttle response, torque, and even MPG! Click Free Tips to see what I have so far! Much of it can be applied to other engine/PCM types, including TPI and LS1.
No Interest in DIY, or Only One-Time Changes?
If you don't have the time, money or desire to do this on your own, but would still like some changes made to your PCM, I also offer a very inexpensive tuning service for 1985–2005 GM OBDI/OBDII TBI/TPI/LT4/LT1/L99/LS1 including 24X/Torqhead (and many Vortec/truck) PCMs—same coverage as the Get Tuned! page and order form.
This includes the Camaro IROC/Z28/SS, Firebird Formula and Trans Am, Corvette, Chevy Caprice & Impala SS, Cadillac Fleetwood, and Buick Roadmaster (including the 4.3L L99 engines), plus many trucks and V6 F-Bodies. GM only. Typical turnaround is about 3-7 business days (weekends rarely counted).
Postal mail — Basic or Power
Mail me a flash PCM (or for chip years I mail you a programmed chip—no PCM shipping). Pricing matches the rest of the site:
- Basic (gear/tire, disables, simple fixes — no power/spark/fuel/auto work): chip $115 · OBDI $100 · OBDII LT1 $100 · LS1 $100
- Power (timing, fueling, MPG options, auto shift firmness / part-throttle points / TCC): chip $215 · OBDI $200 · OBDII LT1 $200 · LS1 $225
US postal prices include free US return shipping (USPS Ground Advantage or UPS Ground on my end—usually 1–3 business days in the US). You pay to ship the PCM one way. One free postal retune if you cover shipping both ways (same setup). Details: Postal mail · Basic · Power.
Boosted, 24X/Torqhead, and many heavily modified setups should use Email or Cable Loan—not a single Postal Power tune.
Email Power Tune
If you already have a cable and software (and a chip burner for chip years), I can work from your stock/current image with no PCM downtime: OBDI $200 · OBDII LT1 $200 · LS1 $250. Up to three free log-based retunes (same setup); extra packs of three $50. See Email method.
Cable loan Power Tune
Rent my kit for a week of flash/datalog fine-tuning without buying gear. Prices are tune + refundable core (same as Service):
- ’85–’93 TBI/TPI/LT1 chip years: $290 + $185 core
- ’94–’95 LT1/L99: $275 + $70 core
- ’96–’97 LT1/L99: $275 + $250 core (LT-Flash kit)
- ’97–’05 LS1/Vortec: $300 + $550 core (CATS OBDII kit)
Fine-tuning window: 7 business days (Mon-Fri, no legal holidays) from the first tune. Full rules: Cable loan.