Dyno question
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
Dyno question
Dynojet dyno.
If the weather was hot and raining on and off (high humidity) , and the operator used STD instead of SAE , would the numbers differ much?
I read that STD are "conditions at the moment" and SAE is "corrected to optimum temp / pressure / humidity "
Also, what would a Mustang dyno reading 385 rwhp @ 5800 , 387 tq @ 3800 - 4900 RPM convert to on a Dynojet dyno? Operator said 12 % so I'm guessing 430/430 rw?
If the weather was hot and raining on and off (high humidity) , and the operator used STD instead of SAE , would the numbers differ much?
I read that STD are "conditions at the moment" and SAE is "corrected to optimum temp / pressure / humidity "
Also, what would a Mustang dyno reading 385 rwhp @ 5800 , 387 tq @ 3800 - 4900 RPM convert to on a Dynojet dyno? Operator said 12 % so I'm guessing 430/430 rw?
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
Both STD and SAE are correction factors. Both are set standards as per Society of Automotive Engineers.
STD correction factor is 60*F air temperature and 29.92 pressure.
SAE correction factor is 77*F air temperature and 29.23 pressure.
If the numbers were the raw power or what the car actually made power wise on that day it would be listed as "Uncorrected ".
If your STD numbers were converted to SAE it would be less power.... 4.5% less as that's the difference between the 2. If your STD numbers were converted to raw Uncorrected numbers, it would be way less power....
Mustang Dyno owners like to claim big power loss compared to Dyno jets but in reality it's been about 10hp at the most.... at least on the few of 450-500rwhp cars I have been able to dyno on both.
Will
STD correction factor is 60*F air temperature and 29.92 pressure.
SAE correction factor is 77*F air temperature and 29.23 pressure.
If the numbers were the raw power or what the car actually made power wise on that day it would be listed as "Uncorrected ".
If your STD numbers were converted to SAE it would be less power.... 4.5% less as that's the difference between the 2. If your STD numbers were converted to raw Uncorrected numbers, it would be way less power....
Mustang Dyno owners like to claim big power loss compared to Dyno jets but in reality it's been about 10hp at the most.... at least on the few of 450-500rwhp cars I have been able to dyno on both.
Will
Last edited by rklessdriver; Jun 26, 2017 at 10:34 PM.
