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I'm getting my car dynoed next week. The dyno is a Dynojet. I'm going to dyno it bone stock, then with the K&N air filter and the Predator tune. I wanted to do 4 separate runs to see the difference between each (for general knowledge). I was gonna do stock, next with the K&N air filter and stock tune, then the Predator tune and stock filter, and lastly with both. But the extra cost to do the extra runs might not be worth the money. I will dyno again after the headers and exhaust upgrade.

Anyway, what is the difference between a Dynojet and Mustang dyno? I know the Mustang dyno calculates for real world power losses associated with driving and friction etc. But how much of a power difference is there between the two. Meaning if the Dynojet says x hp/tq, how much would that be on a Mustang? Is there any calculator or equation to figure this out?
 

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Your numbers are not gonna jump all that much with a k&n filter and predator tune.

The mustang is typically lower, but I don't know the science behind it. Sounds like you're wasting a lot of money just to have the pretty graph with some numbers on it....why? Numbers will fluctuate from run to run, and if you do it on different days and the weather is different, your #'s will also change a bit. If anything do it stock and do it when all your mods are done.
 

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Your numbers are not gonna jump all that much with a k&n filter and predator tune.

The mustang is typically lower, but I don't know the science behind it. Sounds like you're wasting a lot of money just to have the pretty graph with some numbers on it....why? Numbers will fluctuate from run to run, and if you do it on different days and the weather is different, your #'s will also change a bit. If anything do it stock and do it when all your mods are done.
I was mainly doing it to see where I stand. The shop charges $100 for 3 runs including the warm-up. So I'll do the warm up, a stock run, and a run with the tune and filter. I won't be adding any other mods for a few months. That is what sucks about dynos...that different days result in different numbers.
 
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