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Logan Motorsports' Three Valve Performance Swap Kit - Do The Math
Add Three-Valve Performance to 1996-2004 ’Stangs with Logan Motorsports’ Swap Kit
On The Dyno
Tuning the transplanted Three-Valve Mustang to run smoothly and perform well in Javier Rivas' 1999 Mustang GT was the last piece of our swap project. Logan Motorsports uses SCT tuning software for its plug-and-play calibrations for this engine exchange, and when creating the tunes, DeWayne Logan's primary area of focus is in the spark tables and calibrating the engine's timing through the limited parameters of the Two-Valve's PCM.
"A significant difference in the two computer systems is the number of spark tables," Keith says. "The Three-Valve engine with VCT has as many as 60 degrees of total timing variation. However, the Two-Valve has no variation or ability to control VCT.
The Two-Valve's PCM does not have knock control like the Three-Valve's does. Without this feature, DeWayne had to spend a lot of time on the dyno (using Logan's '98 development ‘Stang) trying to find optimal timing for stock Three-Valve engines.
"The combination of the CMRC delete plates, our high-flow air intake, a better combustion chamber, and larger intake-valve area with the Three-Valve heads also allowed us to be more aggressive on air and fuel in the tune," Keith says. "DeWayne has spent countless hours with cars on the dyno and the street developing a tune that incorporates driveability and performance."
In our case, the result is a 1999 Mustang GT that makes more than 300 horsepower at the rear wheels and a whopping 346 lb-ft of torque to go with it. That's almost 50 percent more power than the Pony's stock Two-Valve, and according to Javier, the 'Stang now accelerates quicker, the engine is much smoother, and it gets better fuel economy than the Two-Valve.
With the drop in price for low- mileage Three-Valve engines, we think supplanting one in a 1996-2004 Mustang GT is a great cost-friendly alternative to rebuilding or replacing the Two-Valve engine. And, per Javier's feedback, it's a lot of fun to drive, too.