Actual vs. Corrected HP?
Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 7,155
Likes: 154
From: The Arid Sunny Desert
Actual vs. Corrected HP?
My car recently dynoed at 398 Corrected RWHP. Does that mean that it has that many ponies or is that figure adjusted for perfect conditions while my car really dynoed at far less? According to The Vette Doctors it gained upward of 10 ponies with the dyno tune. I'll know for sure the figures when I pick her up tomorrow. I felt the car was down on power based on some runs that I had at E-town but I cannot be certain if it was the car or me. My 60' times were unspectacular at between 2.01-2.41. It was the Et's in the 13's & the trap speeds of between 106-110 that had me concerned. My last time out she ran consistent 12's in the 112-116 MPH range. We'll see what happens. 
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Originally Posted by Pewtavert
My car recently dynoed at 398 Corrected RWHP. Does that mean that it has that many ponies or is that figure adjusted for perfect conditions while my car really dynoed at far less? According to The Vette Doctors it gained upward of 10 ponies with the dyno tune. I'll know for sure the figures when I pick her up tomorrow. I felt the car was down on power based on some runs that I had at E-town but I cannot be certain if it was the car or me. My 60' times were unspectacular at between 2.01-2.41. It was the Et's in the 13's & the trap speeds of between 106-110 that had me concerned. My last time out she ran consistent 12's in the 112-116 MPH range. We'll see what happens.
Drifting
Joined: Jan 2002
Posts: 1,498
Likes: 3
From: Sacramento CA
drag racing times are all subject to conditions when you are running. Here are a few: How much VHT is on the track, weather, tires, engine temps, wind direction, ect ect.
It is hard to compare different drag events.
It is hard to compare different drag events.
☠☣☢ Semper Ebrius ☢☣☠
Joined: Jun 2001
Posts: 83,301
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From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
SAE Corrected HP and times show you what your car would have/do in 77 degree weather, with 0% humidity, and at 29.235 Hg barometer.
SAE corrected values are used to correctly compare vehicles that have been tested in different conditions.
SAE corrected values are used to correctly compare vehicles that have been tested in different conditions.
Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 7,155
Likes: 154
From: The Arid Sunny Desert
Originally Posted by Scissors
SAE Corrected HP and times show you what your car would have/do in 77 degree weather, with 0% humidity, and at 29.235 Hg barometer.
SAE corrected values are used to correctly compare vehicles that have been tested in different conditions.
SAE corrected values are used to correctly compare vehicles that have been tested in different conditions.
Melting Slicks
Joined: Oct 2002
Posts: 2,855
Likes: 0
Which sounds good in theory-however no 2 dyno's are exactly the same and many vary significantly in corrected numbers and afr's--I won't go into one of my long bitching sessions on FL dyno's but I have seen a dynojet take 2 points off my numbers with DA's ranging from 1840ft to 2115ft and another occasion took 3 points when the DA was 660ft (best da I've seen in FL) standard aviation (for many years) on NA aircraft is 3.5% lose in power for every 1000ft of DA--so take your uncorrected numbers, check the weather for the time of the dyno and use the heat index, dewpointe, hg's, and elevation of the shop, compute your DA (DA x .035) and take that percentage against you uncorrected numbers and they seem to be consistent across the country for similar setups and motor configs.
Thread Starter
Le Mans Master
Joined: Jun 2004
Posts: 7,155
Likes: 154
From: The Arid Sunny Desert
Originally Posted by NEPTUNEBILL
Which sounds good in theory-however no 2 dyno's are exactly the same and many vary significantly in corrected numbers and afr's--I won't go into one of my long bitching sessions on FL dyno's but I have seen a dynojet take 2 points off my numbers with DA's ranging from 1840ft to 2115ft and another occasion took 3 points when the DA was 660ft (best da I've seen in FL) standard aviation (for many years) on NA aircraft is 3.5% lose in power for every 1000ft of DA--so take your uncorrected numbers, check the weather for the time of the dyno and use the heat index, dewpointe, hg's, and elevation of the shop, compute your DA (DA x .035) and take that percentage against you uncorrected numbers and they seem to be consistent across the country for similar setups and motor configs.
Just when I thought I had it. Now I'm really lost!
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Safety Car
Joined: Apr 2004
Posts: 3,932
Likes: 8
From: Hayward California
I am using a dyno to establish a baseline/reference. If other runs are on the same dyno, then the corrected numbers adjust for variances in heat and humidity. That's as controlled as you can get it..
Numbers on different dyno's are just for looks..
Numbers on different dyno's are just for looks..
