THE DYNO

BASELINE

The power curve after the addition of our first round of upgrades showed a smooth and responsive power delivery. 32.4 horsepower over the stock numbers were realized.

272.0 WHP @ 21.8 PSI (1.50 KPa) Boost

Test 1 – HELIX Cat-Delete Pipe

By removing the cat and installing the HELIX cat-delete pipe, horsepower was increased everywhere in the curve. Peak horsepower climbed by nearly 17 horsepower. One dead spot around 6,600 RPM showed no gains. This hiccup remained until the intercooler system was upgraded.

289.9 WHP @ 21.8 PSI (1.50 KPa) Boost

Test 2 – XS Power I/C Intercooler

We predicted that the XS Engineering intercooler should deliver a 4.5% increase in power based on the temperature drop it provided over the factory intercooler. The addition of the intercooler hit the nail on the head by delivering 303.0 horsepower. The 14.1 additional peak horsepower doesn’t tell the entire story of the performance improvement. A full 35 to 40 horsepower were realized from 6600 to 6800 rpm. The power hiccup was completely removed.

303.0 WHP @ 21.8 PSI (1.50 KPa) Boost

Test 3 – XS Hard Pipe Kit

The XS Engineering hard pipe kit delivered a peak horsepower improvement of 7.4 horsepower. Performance increases began at 3,300 RPM and continnued to redline.

310.3 WHP @ 21.8 PSI (1.50 KPa) Boost

There was nothing wrong with letting the cat out the bag on this EVO. By removing the cat horsepower was increased from the beginning until the end of the power curve. Power was gained with increases in engine rpms for the most part. Gains were as high as 17 horsepower at 6300 rpm, the horsepower peak. Overall, peak power was up 16.9 horsepower A dead spot around 6600 rpm showed no gains. Additional timing at the 6600rpm/21psi point of the map only resulted in knock. No matter what was tried with the tuning this hiccup remained until the intercooler system was upgraded. We predicted that the XS Engineering intercooler should deliver a 4.5% increase in power based on the temperature drop it provided over the factory intercooler. For our prediction to be correct, we should have seen peak horsepower increase from 288.9 to 301.9 wheel horsepower. In actuality, the addition of the intercooler hit the nail on the head by delivering 303.0 horsepower, just a single horsepower more than we predicted. The 14.1 additional peak horsepower doesn’t tell the entire story of the performance improvement. A full 35 to 40 horsepower were realized from 6600 to 6800 rpm. The hiccup was completely removed. The XS Engineering hard pipe kit delivered a peak horsepower improvement of 7.4 horsepower. Performance increases began at 3300 rpm and continued to redline.