STILLEN Exhaust & Gen 3 Intake Dynos - 18hp Each!

Denny McLain

Getting the Air/Fuel correct is the most important aspect of tuning. Typically you do not see a tremendous amount of gain over a production tune. As a rule of thumb 5 up to 15hp with 15hp being on the high side, however I've seen gains over 30 on occasions. Usually very little is gained in timing adjustment, but we'll see as every car and every brand is different.

The SAE text books tell you 12.7 for max power. In my experience this is not correct and depends upon the particular type of car and even will vary slightly among individual cars. Most tuners today tune for around 13.0 to 1. Pro Stock cars run optimally in the mid 14 to 1 range.

Dynos don't lie and neither do wideband 02 sensors if functioning correctly. We'll see later what these cars like as again.......it's a clean sheet of paper.

Will post later today what a 100% stock 370Z makes with 150 miles on it along with stock Air/Fuel ratio's.