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Old 08-08-2007, 09:07 PM   #1 (permalink)
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Dyno # Uncorrected vs SAE

What is the difference between SAE & Uncorrected numbers on a Dyno?? What do both numbers mean? What if any is the difference with STD vs. the previous figures?

Thanks!
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Old 08-08-2007, 09:18 PM   #2 (permalink)
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Re: Dyno # Uncorrected vs SAE

Uncorrected or actual numbers are the power numbers as measured at the atmospheric conditions of the time of the test. (more power on a cool day, leess on a hot humid day)

Corrected numbers are the "as tested" actual numbers with an accepted correction factor applied to normalise the results to those that would be measured at a known standard temperature and pressure.

As an example, here is my cars dyno showing SAE corrected numbers - the actual measured numbers on that hot humid day were less - but the number was multiplied by a correction factor of 1.04 to show the power that the engine would have produced had the conditions been the same as those of the "SAE Standard" temperature and pressure.

This allows for tests on different days at different altitudes and temperatures to be somewhat accurately compared.

I would expect the same engine to produce significantly more power on a cool crisp 59* winter day - so for that dyno, the correction factor would be more like 0.8 or less.

STD is simply another "standard" that will have a normalized correction factor applied.

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Last edited by RC45; 08-08-2007 at 09:22 PM.
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Old 08-12-2007, 08:42 AM   #3 (permalink)
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Re: Dyno # Uncorrected vs SAE

I have WinPep 7 on my laptop which is the software that is used for a DynoJet.
I have taken the same dyno sheet and have converted from sae to uncorrected to standard for your viewing pleasure.
This is a base run of a 2006 Z06 with just over 500 miles on it.

Conditions were:
84.77 degrees
24.99 in-hg
70% humidity.

Correction factor is zero of course uncorrected.
1.03 CF in SAE
1.05 CF in STD.
Attached Thumbnails
Dyno # Uncorrected vs SAE-craig-sae.jpg   Dyno # Uncorrected vs SAE-craig-uncorrected.jpg   Dyno # Uncorrected vs SAE-craig-standard.jpg  
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Old 08-23-2007, 08:36 PM   #4 (permalink)
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Re: Dyno # Uncorrected vs SAE

So lets say your SAE numbers are higher than your uncorrected(actual) numbers, could you still rightfully say the SAE numbers are legitimate power of the car?
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Old 08-23-2007, 09:10 PM   #5 (permalink)
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Re: Dyno # Uncorrected vs SAE

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Originally Posted by jz06man View Post
What is the difference between SAE & Uncorrected numbers on a Dyno?? What do both numbers mean? What if any is the difference with STD vs. the previous figures?

Thanks!
How to get 505rwhp with bolt ons

See post #34

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Old 08-24-2007, 12:40 AM   #6 (permalink)
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Re: Dyno # Uncorrected vs SAE

Quote:
Originally Posted by DitchTehFish View Post
So lets say your SAE numbers are higher than your uncorrected(actual) numbers, could you still rightfully say the SAE numbers are legitimate power of the car?
Yes - because they are the normalised numbers.
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Old 08-24-2007, 02:08 PM   #7 (permalink)
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Re: Dyno # Uncorrected vs SAE

Quote:
Originally Posted by DitchTehFish View Post
So lets say your SAE numbers are higher than your uncorrected(actual) numbers, could you still rightfully say the SAE numbers are legitimate power of the car?
You could say "this is the power it car makes under these environmental conditions".

To make valid comparisons of successive performance tests (like when you're tuning the car) or tests on different cars (like at a Dyno event), where the environment can be different from one run to the next (as stated, engines make more power in cold/dry than they do in hot/wet), you need to normalize the measurements to they're all mathematically adjusted to the same baseline condition. "Corrected" = "Normalized".
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Old 08-24-2007, 03:52 PM   #8 (permalink)
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Re: Dyno # Uncorrected vs SAE

Quote:
So lets say your SAE numbers are higher than your uncorrected(actual) numbers, could you still rightfully say the SAE numbers are legitimate power of the car?
Not really, although that is the goal, the problem is the dynos weather station is not that accurate and can be fooled, intentionally or otherwise.

The purpose of SAE correction as others have stated is to "normalize" the environmental conditions. The older SAE J607 standard assumes the engine is being run where the environmental conditions are 60F, 0% humidity with a barometric pressure of 29.92 in-Hg. Whereas the newer SAE J1349 standard is 77F with 0% humidity and a barometric pressure of 29.234 in-Hg.

That means if you were to place your car in an environmentally controlled room having those conditions, the SAE corrected H.P. is what it should make. Therefore, you can take two cars for example; anywhere in the world at any time and compare their SAE corrected numbers as though they were being tested in that same room at the same time under the same conditions. "Same conditions" meaning using the same SAE standards: either the J607 or J1349. You can't compare apples to oranges.

Again, it's a great idea in theory but in actual practice, it is not that accurate a lot of the time for a variety of reasons.

I should add that the LS7 for example was tested using the SAE J1349 standard. So, if the current weather conditions are better or worse than that the engines performance will be either > or < than 505 H.P..

Given that, is the engine a 480 H.P. engine or a 530 H.P. engine? Again, it depends on the actual conditions. The 505 H.P. was achieved under those specific conditions and since all LS7 engines are virtually identical, they all test the same, under the same identical conditions.
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Old 08-24-2007, 10:52 PM   #9 (permalink)
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Re: Dyno # Uncorrected vs SAE

No Doubt:
You are blowing me away this week with the knowledge you have on this and a couple of other subjects.
Thank you....................
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Old 08-25-2007, 07:14 AM   #10 (permalink)
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Re: Dyno # Uncorrected vs SAE

OK, here is my tilt to this corrected vs uncorrected session!

In March, I did ten runs at a local dyno with FRCTom trying to tune my car with worn out overstressed injectors. OAT ~ 65*

The red line is the safest we did that day.

The blue line is last weekend.

No changes to the car, just 110* temp and more humidity than usual for AZ.

You can't tell me there is any correction factor that will predict this kind of change!!

http://www.z06vette.com/gallery/index.php?n=501

I did it because I wanted to see real numbers of what I'm putting down in triple digit weather conditiions out here!!

I almost like the hot weather more, because the RII's stick like glue and you can be really aggressive with the GO pedal!!
I almost need to use the 6 point belts to go on a beer run, but that's just me!!

My .02
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Old 08-25-2007, 07:20 AM   #11 (permalink)
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Re: Dyno # Uncorrected vs SAE

Did you ever get injectors for that pig you ole drunk?????????????
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Old 08-25-2007, 07:30 AM   #12 (permalink)
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Re: Dyno # Uncorrected vs SAE

Quote:
Originally Posted by FRC Tom View Post
Did you ever get injectors for that pig you ole drunk?????????????
Nope!!
I never drive it. Why you have a set of 42's laying around i can buy??

Ken

PS sorry for the temp hi-jack!!
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Old 08-25-2007, 08:08 AM   #13 (permalink)
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Re: Dyno # Uncorrected vs SAE

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Nope!!
I never drive it. Why you have a set of 42's laying around i can buy??

Ken

PS sorry for the temp hi-jack!!
If you ain't drivin it then why bother, just start working on winter fest 2, we will get er done then.
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Old 08-27-2007, 03:15 PM   #14 (permalink)
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Re: Dyno # Uncorrected vs SAE

Quote:
Originally Posted by Kens06 View Post
OK, here is my tilt to this corrected vs uncorrected session!

In March, I did ten runs at a local dyno with FRCTom trying to tune my car with worn out overstressed injectors. OAT ~ 65*

The red line is the safest we did that day.

The blue line is last weekend.

No changes to the car, just 110* temp and more humidity than usual for AZ.

You can't tell me there is any correction factor that will predict this kind of change!!

http://www.z06vette.com/gallery/index.php?n=501

I did it because I wanted to see real numbers of what I'm putting down in triple digit weather conditiions out here!!

I almost like the hot weather more, because the RII's stick like glue and you can be really aggressive with the GO pedal!!
I almost need to use the 6 point belts to go on a beer run, but that's just me!!

My .02
Ken
Just looked at the sheet Ken.
I am wondering why it has gone pig rich, triple dig temps will not cause that big of a change in the afr. I had trouble getting enough fuel and now you have too much.
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Last edited by FRC Tom; 08-27-2007 at 03:43 PM.
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Old 08-27-2007, 04:14 PM   #15 (permalink)
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Re: Dyno # Uncorrected vs SAE

Quote:
Originally Posted by FRC Tom View Post
Just looked at the sheet Ken.
I am wondering why it has gone pig rich, triple dig temps will not cause that big of a change in the afr. I had trouble getting enough fuel and now you have too much.

I don't know Tom.
Maybe they had the sniffer in the wrong pipe.
They always try to stick it in the outside pipe and those go thru the muffler on PRT's. You have to use the inside pipes which are straight thru!!
Plus this is Casey's old car so it's probably haunted by the MTI gremlin!!

Ken
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