This 03 Chevy truck with 6 liter engine had Whipple 6 lb boost supercharger installed.

The kit is crappy in they supply 2 more fuel injectors that are simply installed into the airbridge and has a Whipple controller. All it does it shot that fuel into the air flow and hope for the best.
Had stock GM tune.

As results show without any PCM tune the fuel trims even for part throttle was 8% too lean and by going into WOT/boost the injectors were at 93% duty cycle so not enough fuel even with the 2 extra fuel injectors.

With the base tune you see more PEtiming, higher rev limiter and auto trannie shift RPMs, less knock, part throttle fuel trims now perfect and what owner needs to do is correct the fuel needs to change the stock 28 lb/hr injectors to like 36 lbs and/or add out smart water/methanol injection system

Once that is done then a re-tweak of tune will be done but at the least with the tune the torque increased by 33 ft/lbs and the horsepower increased by 59 HP.

In checking out the Whipple controller we find the 2 added 42 lb injectors were none functional and in fact looks like the wiring for the controller was done incorrectly and never had worked correctly

Location of 2 42 lb/hr injectors installed right into the airbridge to intake is not a safe or proper way to be shooting the flow of 3 43 lb fuel injectors.

Here is the results after we solved all the Whipple Supercharger issues and swapping the stock fuel injectors to 49 lb/hr.

Injectors used are VOR-8F060-005 and the brand is DELPHI rated at 43 lb/hr at 43 PSI fuel rail pressure which makes them 49 lb/hr with GM's 58 PSI rail pressure.

Once owner has gotten dome PCM drive relearn time we will tweak the tune.
Otherwise when owner can he needs to install our 3D smart water/meth injection which will also us to tune for that and gain another 30 HP.

So for a price of a tune, larger injectors and proper use of a OBD scanner to find the Whipple issues the gains were

Before - 313 ft/lb TQ - 283 HP at flywheel to
After - 396 ft/lb TQ - 461 HP at flywheel

Which is a gain of 83 ft/lb TQ and 178 HP


In the end not bad for a very heavy 4x4 that will now surprise people who try and pull on this truck on the road.