Pontiac Trans Am Procharger & Intercoller Install - Blown Away Part II

Part II: Finishing Off The Procharger Install on Project LS1 And performing Exclusive Intercoller Testing

Step By Step

In order to make room for the intercoolers, the air ducts on the Trans Am's front bumper need to be cut as shown. This was painful for your author to watch as the mint '99 Navy Metallic T/A had barely a scratch on the entire car, however it was necessary for cramming as much densely packed air as possible into all 346 ci. One benefit of this location is that it actually uses the air ducts (which were previously non-functional) for moving fresh air across the tops of the horizontally mounted intercoolers.

Once the intercoolers are test-fit, holes need to be drilled in the lower radiator core support member to match those on the intercooler bracket...

Now that East Coast Supercharging has equipped Project LS1 with the Procharger P-1SC-1, an ATI balancer from Thunder Racing, and all of the relocated stock equipment, it was time to wrap things up. The standard 3.5-inch twin high-flow intercoolers were included in the kit as was a Diablo Sport tuner; however, Procharger had just finished developing a 4.5-inch intercooler upgrade that we were dying to get our grubby little hands on. We tested the kit as-is, then installed the new intercoolers and a custom tune from East Coast Supercharging into our Trans Am to see how much more power was to be had.

However, a simple track and dyno test wouldn't be sufficient this go around. The only thing we like at GMHTP more than $10 hookers and huffing Krylon is heavy tech (Editor's Note: the views expressed by Scott Parker do necessarily reflect those of the GM High-Tech Performance staff), and Procharger was happy to accommodate us (with the tech that is). President Dan Jones of ATI Procharger shipped us not only a bunch of testing equipment, but one of his engineers, too. With the help of Product Development Engineer Ryan Bosch and his testing equipment, we could compare the intake air temperature and pressure drop from the 3.5 and 4.5-inch intercoolers.

Before testing, there were still a few loose ends that needed to be tied up. The intercoolers needed to be bolted up with the plumbing connecting it to the blower and the airbox. In order to match the enormous increase in airflow, the stock 26-pound injectors would need to be upgraded to the 38-pound units supplied in the kit along with a new in-line fuel pump. The spark plugs would need to be taken two steps colder, so ECS supplied us with a set of NGK TR6s.Follow along for the remainder of our LS1 Procharger install and testing at the East Coast Supercharging facilities in Cream Ridge, New Jersey. As mentioned in Part I, this will be Project LS1's swan song, and we had every intention of taking one last trip down the 1320 without performing a coup de grace on the stock 10-bolt. So for the final drag test we returned to our home away from home Englishtown Raceway Park for a few hits on the Mickey Thompson drag radials.

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