Is There a New Dyno Standard?

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Jul 22, 2003

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Buffalo, NY

Jul 15, 2005

#1

• Jul 15, 2005

• #1

Is there a new dyno standard out there, or at least one that's gaining popularity? I had my car dyno'ed on a Dynojet about a year ago and the dyno report showed SAE rear wheel horsepower. I'm now seeing STD rear wheel horsepower on a number of dyno reports and of course they're spitting out higher numbers. Even the shop that dyno'ed my car has switched to STD.

What do you guys think?

 

diddylx50

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#2

• Jul 15, 2005

• #2

Im not sure on the answer to your question. Everytime that I get my car dynoed I make sure its SAE so its accurate with the rest of my pulls.

Andrew

 

EMW150

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#3

• Jul 15, 2005

• #3

Most are going by standard anymore. The shop I go to used SAE consistantly and then switched because most others are using standard. It's only about a 3 percent difference.

 

Foxfan88

My Grandpa has great wood.

Sep 13, 2004

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#4

• Jul 15, 2005

• #4

whats A

whats SAE ad STD

 

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#5

• Jul 15, 2005

• #5

EMW150 said:

The shop I go to used SAE consistantly and then switched because most others are using standard. It's only about a 3 percent difference.

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Yep, that's what the shop I go to started doing too. At least it's 3% more using the standard.

I'm replacing my Flowmaster Force II (3 Chambers) with some MAC ProDumps. I'm hoping for 15 RWHP. We'll see.

 

EMW150

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#6

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Foxfan88 said:

whats SAE ad STD

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It's the correction factors used. When you dyno a car in poor conditions, the factors are applied to show what it would make under a certain condition to make all uniform. So if you dyno in poor conditions, it should show the same results as if it was dyno'd in perfect conditions and the other way around. Different organizations use different conditions to base their factors on. Get it?

 

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Jul 15, 2005

#7

• Jul 15, 2005

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90* outside air temperature and higher are not ideal conditions for dynoing cars, right?

 

srothfuss

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Oct 17, 2004

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Jul 15, 2005

#8

• Jul 15, 2005

• #8

I think I read in a magazine that SAE (the society of automotive engineers) have introduced a new method for measuring / calculating horsepower figures. But that was all I read and I couldn't tell you if it's being implemented in the industry now.

 

S

Speeds8erM-1

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#9

• Jul 17, 2005

• #9

SAE is the way to go unless people are dyno queening it lol.

 

Tomato

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Jul 17, 2005

#10

• Jul 17, 2005

• #10

yeah, std is retarded. It is WAY high, and assumes sea level conditions that are unrealistic...

If they use std, it's cause they wanna provide bigger numbers... typically 5% more.

SAE is the way to go.

 

89MustangGX

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Jul 3, 2001

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#11

• Jul 17, 2005

• #11

Why correct at all?

Do you correct your quarter mile times and claim that's what you ran too?

 

Grn92LX

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#12

• Jul 17, 2005

• #12

89MustangGX said:

Why correct at all?

Do you correct your quarter mile times and claim that's what you ran too?

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VERY VERY well said!

When I dyno my car its to check the tune and to see what it makes. I don't care what it could make in better conditions (I live on sea level so you don't get much better anyway) I care what it makes under the given conditions it was in during the dyno pull. STD is what i use, but I, unlike many sadly, don't use dyno's as a bragging right!

 

S

Speeds8erM-1

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#13

• Jul 17, 2005

• #13

You cant compare changes from one thing to another on different days if you dont use a correction factor. You also cant compare a similiar combo to people in another state to see where you stand. Most of the time people that want actual or STD numbers are really disappointed with their numbers and just want the highest ones.

Some people correct their track times but bleh, no point in it. You can keep track of DA and stuff to see how the car changes in different weather and stuff though.

 

Tomato

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#14

• Jul 17, 2005

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Yeah, no kidding. You HAVE to correct, otherwise, you don't know if the 2 degrees more timing made the extra 4 rwhp, or because the baro was higher....

 

SoldMySS4a5.0

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Jul 18, 2005

#15

• Jul 18, 2005

• #15

Grn92LX said:

VERY VERY well said!

When I dyno my car its to check the tune and to see what it makes. I don't care what it could make in better conditions (I live on sea level so you don't get much better anyway) I care what it makes under the given conditions it was in during the dyno pull. STD is what i use, but I, unlike many sadly, don't use dyno's as a bragging right!

Click to expand...

Amen to both

 

The Fox

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Jul 18, 2005

#16

• Jul 18, 2005

• #16

either way, as long as you're seeing where you're making power I'm sure everything is ok. I would use it more to tell shift points than anything else. And I would prolly only use a mustang dyno to get even MORE accurate results. But any dyno will tell your powerband.

 

S

Speeds8erM-1

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#17

• Jul 18, 2005

• #17

The new Dynojets have Eddy Current Chassis Loading just like a Mustang Dyno. I dont trust Mustang dynos. I have seen people play with the loading ALOT until they pulled off some dyno queen numbers which would be high for that car on a Dynojet, let alone a Mustang dyno.

 

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Jul 18, 2005

#18

• Jul 18, 2005

• #18

I agree with the dynoqueen comments. While big time dyno numbers look cool, the real measurement of the car is done at the track...with a good driver of course. Well, I'm hoping that I can get my car dyno'ed with the corrected numbers (SAE) so that I can see what difference pulling my 3 chamber Force II's and going to ProDumps did for me. I'm hoping for at least 10-15 RWHP. I know though if they do the STD pull that I'll have about 15-20 extra RWHP added and I know that number isn't realistic.

Would it be easy for the dyno puller to change the results from STD back to SAE for my pull? It's all just settings in the computer right?

 

S

Speeds8erM-1

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#19

• Jul 18, 2005

• #19

They can print you SAE, STD and Actual.

 

just4bob50

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#20

• Jul 18, 2005

• #20

I had my car tuned on a mustang dyno, and it was 92 deg. in the shop and really humid. The tuner was very cool and showed me step buy step how he loads the dyno and with what info he used load it with. He said that on a dynojet it is very easy to change the loading factors or braking from run to run.