check out my results on my thread on dynos I installed the TB hp up one torque down 7 but there is issues with the whole dyno process.
yes, anytime you dyno anything for comparisons, you must dyno before and after on the same dyno setup if at possible. meaning, run the stock components and then run the new perfomance mods on the same day, with the car not being moved off the dyno.
no 2 dyno runs can be replicated. there are too many variables. you cant compare one best run to another. the most scientific way is run the vehicle 3 times and take an average of those 3 runs, then make your mods, then do 3 more runs. and use that average.
there are so many variables that can skew a dyno result; some are the obvious, like air temp and humidity.
but there are things that savy dyno operators try to duplicate every time; like strap tension, on the rear of the car can change 5-10 hp, by over tight or too loose rear straps.
tire pressure--a big one too, more tire pressure reduces the rolling resistance, and helps show more power. we deflate the tires on a car and refill with nitrogen, as air pressure will change with tire temp changes and nitrogen in a tire will stay the same. your air presure is different after the third dyno run than it was at the first.
where the fans are placed, each time.
on a single rear drum dyno (most dynojets) where the tire contact patch is located, on the drum.is the car dead nuts centered or forward or back of the center of the drum. is the car completely straight on the drum?
another VERY important dyno graph to have your dyno operator pull up for you is an elapsed time run. instead of having the graph read rpm or speed, have him change the dyno to TIME. you may do a mod that doenst make more peak horsepower, BUT it will make more power thru the curve, and that will show the engine reaching its peak power sooner. think of it as 2 cars can both go 150mph and turn 6000 rpms doing it, but the one that reaches that speed first is obviously the fastet and the one that is desired.
TIME run graphs on a dyno are VERY important.
we had a client who had a cam put in his gen3. it made great rwhp, of 570hp. but it was a dog to drive, so i overlapped his dyno run with a well tuned stock cam engine that only made 500hp. when both runs are viewed on a TIME graph, the 500hp engine made over 140hp more everywhere except at peak power. thats what you want to see, you are only at peak power for an instant, you run thru the curve for the lenght of time you are in each gear. TIME shows how effecient an engine is at making its power.
you must always compare apples to apples when doing dyno runs, as a dyno run will only show what your current setup is-on that dyno at that time, you could redyno the exact same car by taking it off the dyno putting it back on and they see a 10hp difference!
take very accurate notes, moniter tire pressure, make sure the straps are in the exact same place as before and try to record strap tension, look at your weather data results. ask your dyno tech when the last time his dyno was serviced and or what is the current calibration rate. dynos are great tools, but your butt and a drag strip can be more usefull sometimes. if anyone ever has any tuning questions, please dont hesitate to email or contact me anytime.
. It "plate" doesn't touch anywhere and is very smooth. I had no problems with the tps sensor at all. Just take your time and it's a breeze. You will be impressed with the throttle response. I am going to shoot some photos and give result after my dyno this friday on it. PM me if you need any input on the install or im sure gary will help you too.
