So some time last year I got my car dyno’d at a dyno day when it just had the ecs h-pipe on it.
It was fairly warm that day (84.16F, 29.58 in-HG, 25% humidity) and I had about an hour of smooth sailing on the highway to get there. I arrived an hour or two early, and put a bag of ice on the manifold until it was my turn.
It put down 329.02 hp and 285.42 lbs/ft of torque that day.
http://www.youtube.com/watch?v=-WqSrA-chZU
(Graph at the end of the video)
There was another dyno day this year so I decided to get a few pulls done out of curiosity. Since then I’ve gotten the JHM tune and full exhaust, intake spacers, and some lw parts (although the latter bunch wouldn’t really manifest on the dyno).
Conditions were similar (87.49F, 29.80 in-HG, 22% humidity), the car was cleaner, but it was about 2 hours of stop and go highway driving all the way there. I got there around 45 minutes before the car went on the rollers, but didn’t have any ice this time so I just left the hood open with a can of cold coke on the manifold.
First run was done in 4th, and the second in 3rd. Both put down around 358hp/307tq. We were supposed to get only 2 runs, but they allowed me to keep the car on the rollers and let it cool down for another 10 minutes or so after misting some water on the manifold. Next pull was in 3rd and it put down 365.67hp/311.71tq.
Funny (but not surprising) how 10 minutes of sitting around with a fan directed at the manifold with a bit of water misted on could make a notable difference. Probably would have been much worse without the intake spacers. Even after the 2 hour drive in traffic the manifold was still cool enough to touch and keep your hand there comfortably.
http://www.youtube.com/watch?v=PJeiUmCak0Q
Thought it was also neat to compare the difference in the exhaust note in both videos (same camera sitting on the same plastic bucket in the same location behind the car).
Here are the two plots laid with each other
I think I’ve solidly done more passes than dyno’s.
