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Cummins12V98

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Posted: 11/14/19 01:47pm Link  |  Quote  |  Print  |  Notify Moderator

"In the US, all light duty vehicles are rated using the same testing procedures defined by the Society of Automotive Engineers. It is horsepower at the rear wheels with all accessories installed (A/C is likely turned off)."


No way this can be true. Every DYNO event I have been to the Stock Cummins nets about 85% of advertised HP. Sometimes a bit more.


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ScottG

Bothell Wa.

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Posted: 11/14/19 03:02pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

" Every DYNO event I have been to the Stock Cummins nets about 85% of advertised HP. Sometimes a bit more.


That's in part because the intercooler is out of the picture. They make a big difference!

* This post was edited 11/14/19 03:48pm by ScottG *


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Cummins12V98

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Posted: 11/14/19 03:56pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

Cummins12V98 wrote:

" Every DYNO event I have been to the Stock Cummins nets about 85% of advertised HP. Sometimes a bit more.


That's in part because the intercooler is out of the picture. They make a big difference!


WHY is it out of the picture?

Not much different than on the road with a big fan blowing at the front.

Groover

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Posted: 11/14/19 04:45pm Link  |  Quote  |  Print  |  Notify Moderator

I wonder how much the manufacturer can play with the numbers. I am more familiar with outboard boat motor ratings and know that they have to be within 10% of the rated power, more or less, doesn't matter which way. Today most brands are selling performance more than power and with computer controls the typical outboard makes about 109% of rated power at the prop shaft. It is common to use the same engine to make several different power outputs, frequently with nothing different but the computer programming. I have heard that one engine that is advertised as 225hp at the rated RPM (5500) actually makes about 270hp at 4000RPM. This is within the rules since that is not the rated RPM. This brand like to advertise how strong their acceleration is. It is amazing how people can find ways around the rules.

ppine

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Posted: 11/14/19 05:11pm Link  |  Quote  |  Print  |  Notify Moderator

It is logical that manufacturers would measure hp at the flywheel with everything off. That would be the way to get the highest reading.

ScottG

Bothell Wa.

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Posted: 11/14/19 05:50pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

ScottG wrote:

Cummins12V98 wrote:

" Every DYNO event I have been to the Stock Cummins nets about 85% of advertised HP. Sometimes a bit more.


That's in part because the intercooler is out of the picture. They make a big difference!


WHY is it out of the picture?

Not much different than on the road with a big fan blowing at the front.


I've only been to a few dyno events but none ever used a fan - do they sometimes? It would take a big one. Banks uses an elaborate setup of 40 HP worth of electric fans a bunch of ducting for dyno runs. Anything short of that isn't going to move enough air to make a difference IMHO.

ls1mike

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Posted: 11/14/19 06:36pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

Cummins12V98 wrote:

ScottG wrote:

Cummins12V98 wrote:

" Every DYNO event I have been to the Stock Cummins nets about 85% of advertised HP. Sometimes a bit more.


That's in part because the intercooler is out of the picture. They make a big difference!


WHY is it out of the picture?

Not much different than on the road with a big fan blowing at the front.


I've only been to a few dyno events but none ever used a fan - do they sometimes? It would take a big one. Banks uses an elaborate setup of 40 HP worth of electric fans a bunch of ducting for dyno runs. Anything short of that isn't going to move enough air to make a difference IMHO.

You are in Bothell? I have used 3 different Dynos in this area. I have always seen a fan used. I have been to about 25 dyno days. I can't imagine not using one. Come to Auburn and watch my Caprice get Dynoed after I install the cam and headers. Those fans make a difference.


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ScottG

Bothell Wa.

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Posted: 11/14/19 07:37pm Link  |  Quote  |  Print  |  Notify Moderator

ls1mike wrote:

ScottG wrote:

Cummins12V98 wrote:

ScottG wrote:

Cummins12V98 wrote:

" Every DYNO event I have been to the Stock Cummins nets about 85% of advertised HP. Sometimes a bit more.


That's in part because the intercooler is out of the picture. They make a big difference!


WHY is it out of the picture?

Not much different than on the road with a big fan blowing at the front.


I've only been to a few dyno events but none ever used a fan - do they sometimes? It would take a big one. Banks uses an elaborate setup of 40 HP worth of electric fans a bunch of ducting for dyno runs. Anything short of that isn't going to move enough air to make a difference IMHO.

You are in Bothell? I have used 3 different Dynos in this area. I have always seen a fan used. I have been to about 25 dyno days. I can't imagine not using one. Come to Auburn and watch my Caprice get Dynoed after I install the cam and headers. Those fans make a difference.


[emoticon]

ls1mike

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Posted: 11/14/19 08:25pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

ls1mike wrote:

ScottG wrote:

Cummins12V98 wrote:

ScottG wrote:

Cummins12V98 wrote:

" Every DYNO event I have been to the Stock Cummins nets about 85% of advertised HP. Sometimes a bit more.


That's in part because the intercooler is out of the picture. They make a big difference!


WHY is it out of the picture?

Not much different than on the road with a big fan blowing at the front.


I've only been to a few dyno events but none ever used a fan - do they sometimes? It would take a big one. Banks uses an elaborate setup of 40 HP worth of electric fans a bunch of ducting for dyno runs. Anything short of that isn't going to move enough air to make a difference IMHO.

You are in Bothell? I have used 3 different Dynos in this area. I have always seen a fan used. I have been to about 25 dyno days. I can't imagine not using one. Come to Auburn and watch my Caprice get Dynoed after I install the cam and headers. Those fans make a difference.


[emoticon]


I met my wife in Bothell, she grew up on Whidbey Island.

Huntindog

Phoenix AZ

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Posted: 11/15/19 02:02am Link  |  Quote  |  Print  |  Notify Moderator

Quote:


"Certified power" just means that they had a third party SAE licenced person witness them do the J1349 or J1995 test.
I would not discount this requirement with "just".

If you want real figures that you can rely on..... It is a big deal. Those that do it seem to always perform better, in spite of having lower numbers.

Whenever a company is allowed to self test anything, they always come up with better results.

In my buisiness, I have seen janitorial companies self test the emissions of their equiptment.... Wanna guess how often they fail?
OSHA allows this... What a joke.

On the retail side, we self inspect food safety aspects of the buisiness... Same thing, good scores invariably result. Of course when the health dept shows up..... The truth shows up in their report.. So now we have a independant company show up to do unanounced suprise inspections, in addtion to our self inspections. The outside company is very tough, and our health dept scores have improved dramactically as a result.

This self dyno testing works the same way... It is human nature to want a good score.... It doesn't matter what is being measured. If we are allowed to do it ourselves, our score WILL be better.


* This post was last edited 11/15/19 04:57am by Huntindog *   View edit history


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