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[ 7 posts ] |
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GregF
Driver
Joined: Nov 21, 2009 Posts: 216 Location: Redmond, Wa.
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We are getting ready to make a bunch of Pre-Season dyno runs and I have some questions... 1. When tested at an event is it just one pull and off or several runs? 2. What correction factor is used? ( there are 6 or 7 choices on a Dynojet 248) 3. Last year we used just temp and atmosphere correction, and we had numbers that seem close to the 144hp limit.
Today I went to the dyno with a car with a fresh engine and learned the following:
Uncorrected HP 141.2, atmo/temp correction 138.1hp, SAE correction 134.0hp.
Tell me which one we are all tuning to.... Greg F
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Mon Dec 06, 2010 7:42 pm |
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#69
Rookie Driver
Joined: Sep 13, 2010 Posts: 31
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I think it is SAE but have been away to long
KT
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Mon Dec 06, 2010 9:32 pm |
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Director
Moderator
Joined: Nov 05, 2009 Posts: 1634 Location: Isle of Palms, SC
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Yes, SAE.
3 pulls, using the highest recorded value for HP and TQ.
_________________Dave Derecola National Director 944 Cup cup944@aol.com
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Mon Dec 06, 2010 11:02 pm |
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tim pruitt
Driver
Joined: Nov 22, 2009 Posts: 184 Location: Lawrenceville, GA
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What smoothing factor?
_________________Tim Pruitt88' 924S Wide Body
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Tue Dec 07, 2010 3:32 pm |
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GregF
Driver
Joined: Nov 21, 2009 Posts: 216 Location: Redmond, Wa.
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Jeez, using SAE I have a lot of work to do.... Greg
( btw, I have been using 5 as the smoothing factor to get readable results.)
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Tue Dec 07, 2010 6:43 pm |
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johntorg
Driver
Joined: Nov 06, 2009 Posts: 126
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Here are the GTS rules with a smoothing factor of 4. It would be nice to use the same Dynos, Correction and factor, since some of us run in both series.
". Competitors must use a Dynojet brand of dyno for certification, and all compliance runs at events will be made on a Dynojet Model 248, 224, or 424 in SAE mode with a smoothing factor of 4 so it is highly recommended to use one of those dynos with those settings for certification to avoid any errors in classification. To allow a small safety margin for dyno variance, a forgiveness of 4WHP will be given to cars with WHP greater than WTQ and a -4 factor will be applied to the formula for cars using the averaging method for WTQ greater than WHP"
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Tue Dec 07, 2010 10:23 pm |
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Director
Moderator
Joined: Nov 05, 2009 Posts: 1634 Location: Isle of Palms, SC
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SF of 4 is fine.
_________________Dave Derecola National Director 944 Cup cup944@aol.com
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Tue Dec 07, 2010 10:44 pm |
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