Dumb question concerning dynos.....
Thread Starter
Drifting
Joined: Jan 2005
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From: Spring Hill, Florida Life is all about new beginnings;...TRY ONE!
St. Jude Donor '07-'08
Dumb question concerning dynos.....
OK, I have never had my car on a dyno, Heck I've never even SEEN a dyno; but one thing I've always wondered is this:
How can an acurate hp reading be given when there is no air blowing in through the intake? does that not increase hp? or is that taken into account through the programming?
Told you it was dumb! :o
How can an acurate hp reading be given when there is no air blowing in through the intake? does that not increase hp? or is that taken into account through the programming?
Told you it was dumb! :o
Melting Slicks
Joined: Jan 2003
Posts: 2,026
Likes: 178
From: Jacksonville, NC
Originally Posted by RatedX
OK, I have never had my car on a dyno, Heck I've never even SEEN a dyno; but one thing I've always wondered is this:
How can an acurate hp reading be given when there is no air blowing in through the intake? does that not increase hp? or is that taken into account through the programming?
Told you it was dumb! :o
How can an acurate hp reading be given when there is no air blowing in through the intake? does that not increase hp? or is that taken into account through the programming?
Told you it was dumb! :o
Jim K.
Thread Starter
Drifting
Joined: Jan 2005
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From: Spring Hill, Florida Life is all about new beginnings;...TRY ONE!
St. Jude Donor '07-'08
So then, apparently it's just a rough gauge of true hp and not the absolute standard that some folks make it out to be.
Thanks!
Thanks!
Safety Car
Joined: Jun 2004
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From: Body by Zaino! Near St Louis!
No two Dyno test will read the same. Even back to back runs will give a slightly different results - let alone when you try to compare readings at one shop to another day at another shop. Dynos do try to correct for temperature, relative humidity and air pressure, but they are not perfect.
The most important use of a dyno run is to establish your base values (usually the average of two or three runs), make your changes and note the results. You can then compare to see the change .
Good luck and have fun
Burning Brakes
Joined: Apr 2004
Posts: 866
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From: Bakersfield, Blown 402 Z06 Ca
You said that there is know air flowing to the mass air sensor. What they do is put big fans in front of the car to give you the air as if your driving down the street. One thing though, you can dyno at one shop and then dyno at another shop and have two different readings. That has to do with the person that is doing the dyno. My car dyno'd at 339.19 rwhp and 347.46 rwtq.
Team Owner
Joined: Jul 2004
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From: .... NJ
Cruise-In VII Veteran
St. Jude Donor '05 thru '19
There are also different types of chassis dynos and they should be calibrated for accuracy. So the same car can put down diferent HP numbers on diferent dynos on the same day. Some people use a large fan in front of the car to help keep it cool so simulate if it was moving on the road.
Thread Starter
Drifting
Joined: Jan 2005
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From: Spring Hill, Florida Life is all about new beginnings;...TRY ONE!
St. Jude Donor '07-'08
[QUOTE=gairno]You said that there is know air flowing to the mass air sensor. What they do is put big fans in front of the car to give you the air as if your driving down the street.
AHHH!... Well like I said I've never even seen a dyno.......Thanks everyone
AHHH!... Well like I said I've never even seen a dyno.......Thanks everyone
Race Director
Joined: Feb 2003
Posts: 11,133
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From: ~The DARKSIDE Group~
Originally Posted by RatedX
So then, apparently it's just a rough gauge of true hp and not the absolute standard that some folks make it out to be.
Thanks!
Thanks!
Yep, and there are other variances such as temperature, air pressure and humidity.
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Verdad Gallardo
Tech Contributor
Joined: Oct 1999
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From: Charlotte, NC (formerly Endicott, NY)
The DynoJet is accurate to within +/- 1%. That means with a 300 horsepower reading you could really have 297 or 303. That is why there is some variation between back to back runs. The only way to establish a baseline is to make several runs and average their readings then make your changes and make the same number of runs again and average their result.
Bill
Bill
