Custom Tuning (OBD2)

This listing is for tuning only.  If you are looking for a programmed computer, please use the Performance Computer listing.  Tuning is available for 3100 and 3400 engines only!  HPTuners has removed the newer engines from our license and we are unable to offer any tuning services for those ap…

HPTuners MPVI 2

The newest version of HPTuners hardware was recently released, with improved features and updated software.  These units do not include credits, which are required to tune a car.  You can scan without credits, so we offer these bare, and with 2 credits at a discounted rate.  Additional credits ca…

3400 Swap Chip

Based on a stock 2000+ 3400 swap into a 5 speed Fiero, with the 1227730 ECM.   All manual transmission setups should be a plug and play deal, while the automatic may need some tweaks to fine tune.  We have done a couple auto trans setups but mostly manual trans.  2000+ injectors and 55 PSI fuel …

3500 Swap Chip

Based on a stock 2004-2006 3500 LX9 with the 1227730 ECM, using a 3400 fuel rail, 2000+ fuel pressure regulator at 55psi, and 28# injectors.   All manual transmission setups should be a plug and play deal, while the automatic may need some tweaks to fine tune. Custom tuning is available for mod…

1997+ 3100 Performance Computer

Our performance computers are based on dyno testing and street testing, giving the best possible tune for those than take care of their vehicle.  Improved spark and fueling based on application/octane, and improved shift points and line pressure adjustments for the 4T45 and 4T65 equipped engines. …

1999+ 3400 Performance Computer

Our performance computers are based on dyno testing and street testing, giving the best possible tune for those than take care of their vehicle.  Improved spark and fueling based on application/octane, and improved shift points and line pressure adjustments for the 4T45 and 4T65 equipped engines. …

180* Thermostat for FWD 60V6

Lower temperature thermostats are designed to open sooner, and allow the engine to stay cooler in racing and hot climate applications.  Fan settings in computer controlled vehicles will need to be adjusted for the new thermostat.  This stat fits the 2.8/3.1/3.4 DOHC/3100/3400/3500 Aluminum Head en…

HPTuner Credits

Credits are used to flash vehicles with HPTuners hardware.  With the MPVI 2 released, HPTuners has made the credits universal, rather than per car manufacturer.