Why it's good to put your car on a chassis dyno.

[FoxFour]

So yesterday I go to a local Mustang club event that was holding a dyno day. What that is , is that a bunch of people get together and run their cars on a chassis dyno for the day and have a good time. So, with the little mods that I have on the car I was figuring that I was looking at around 270 hp to the rear wheels. Get on the dyno and found out from the three runs that I made that I was putting out around when the car was stock plus, my torque reading was lower than stock. So I go home and diagnose the problems. Well, one of them is replacing my stock coil packs, according to my chart you can see that there is a little misfire or something after about 5000 rpm's. Second, according to my DTC scanner was that my InterMediate Runner Control (IMRC) system was not opening, which is essentially two plates, one on each side of the bottom of the intakes and has butterfly valves that control the direction of airflow to each individual runner. After 3250 rpm the butterflies open and redirect airflow to the shorter runners which increase upper rpm power. So I essentially have a car that is currently castrated in the upper rpm band and never really knew it until now. So thankfully I can go ahead and rectify the problems. In a sense, it was a good day and a bad day: A bad day because I couldn't get the power that I wanted; a good day because now I can fix it.