guys i have owned and operated two dynos for 17 yrs. it kills me when guys say their car lost 10 hp later days later. it could be just 10 minutes later if the car was off the dyno and reinstalled, things can and will be different.
never ever are two different dyno runs going to exactly match up on different days. it can be close but more often than not the numbers can be different.
nothing is ever the 'exact' same. the straps holding the car down affect the ouput. you will never get the straps to pull the same tension, air pressure, oxygen/air qaulity content,exact position of tires on the drum, tire tempatures, oil temps,fuel specific gravity from one fill up to the next, humidity, the dyno drums bearing temps, the glazing on a flywheel to allow the clutch to bite, barometric pressure, **** the moons gravatational pull!
to compare apples to apples you use a dyno to evaluate something (s) on the same day within a short window of time so you can qauntify data back to back and 'try to' eliminate all variables.
it is just a tool, not an absolute. it helps you get a direction to head towards. its like reading your cars blood pressure to make sure its within an accetable window of operation.
you check AFR's and power curves and make sure they are as close and can be
top fuel cars dont tune on a dyno----its the et and mph that tell the tale, because to many things can change and affect each run. and guess what, top fuel guys are UBER consistant and **** changes, because even for million dollar race cars, no two runs are ever the same. engines are a lot like living creatures that constantly change and perform differently based on ever changing variables in the world around them
never ever are two different dyno runs going to exactly match up on different days. it can be close but more often than not the numbers can be different.
nothing is ever the 'exact' same. the straps holding the car down affect the ouput. you will never get the straps to pull the same tension, air pressure, oxygen/air qaulity content,exact position of tires on the drum, tire tempatures, oil temps,fuel specific gravity from one fill up to the next, humidity, the dyno drums bearing temps, the glazing on a flywheel to allow the clutch to bite, barometric pressure, **** the moons gravatational pull!
to compare apples to apples you use a dyno to evaluate something (s) on the same day within a short window of time so you can qauntify data back to back and 'try to' eliminate all variables.
it is just a tool, not an absolute. it helps you get a direction to head towards. its like reading your cars blood pressure to make sure its within an accetable window of operation.
you check AFR's and power curves and make sure they are as close and can be
top fuel cars dont tune on a dyno----its the et and mph that tell the tale, because to many things can change and affect each run. and guess what, top fuel guys are UBER consistant and **** changes, because even for million dollar race cars, no two runs are ever the same. engines are a lot like living creatures that constantly change and perform differently based on ever changing variables in the world around them
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