Dyno of my G37s after FI Catback & HFC
04-28-2008 | 11:47 PM
#33
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No its flywheel. Yes dynapacks measure at the hubs, but regardles of if its measuring at the hubs or wheels or even the freaking driveshaft for all it matters, if the TCF is 1 then its FLYWHEEL HP. Just ask any tuner who knows what the hell they are doing with a dynapack.
04-28-2008 | 11:52 PM
#34
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Heres the post straight from the horses mouth:
http://www.my350z.com/forum/showpost...6&postcount=17
No TCF = FLYWHEEL HP
and from dynapacks own site:
http://www.dynapackusa.com/vehicle.htm
and we can clearly see in the photo that is says flywheel with a TCF of 1.0 not axle.
http://www.my350z.com/forum/showpost...6&postcount=17
The graph says flywheel no matter whether you apply a transmission correction or not. Dynapack's idea of a transmission correction is a straight percentage. This is applied through the transmission correction factor, or "TCF". Note the box at the bottom of the printout. It says "TCF 1.00". This indicates that no correction was applied. If the TCF was 1.15, then a 15% correction factor would be applied.
At Church Automotive Testing we do not use a TCF other than 1.0 unless specifically requested by a customer (even then we don't like to because it can be used to mislead people).
At Church Automotive Testing we do not use a TCF other than 1.0 unless specifically requested by a customer (even then we don't like to because it can be used to mislead people).
and from dynapacks own site:
http://www.dynapackusa.com/vehicle.htm
TC Factor - allows user to enter a driveline loss factor (Transmission Correction) to add a percentage of power to the flywheel power graphs. A factor of 1.0 adds no correction factor, a factor of 1.15 would add a 15% correction factor to the flywheel numbers. Axle (rear wheel) numbers are not effected by the TC Factor box.
Last edited by Infinus; 04-28-2008 at 11:56 PM.
04-29-2008 | 12:32 AM
#36
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I'm just saying based of what the dyno manufacturer says that graph is flywheel. Weather conditions such as temp, Relative Humidity, elevation, Air Density etc all play a factor too, now granted I'm not sure how much. Any tuners on here use the dynapack and wanna clarify?
04-29-2008 | 10:03 PM
#37
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From: Los Angeles
hmmmm church's is right off carson...so i'm guessing they are at sea level....
oops...i guess they moved checking from their website...wow....when did they do that?
well...at the most imposrtant thing is that he has a baseline to work off of...
oops...i guess they moved checking from their website...wow....when did they do that?
well...at the most imposrtant thing is that he has a baseline to work off of...
04-29-2008 | 11:57 PM
#38
What is the rule for % loss from flywheel HP to WHP? Just curious as to what he would tell the "average" person on his total HP setup...Lord knows that 90% of the people I talk to have NO IDEA what I mean by wheel horsepower and the importance of that number over flywheel...
15-18 percent for a manual
20-23 percent for an automatic
Now the dynapak measures rear wheel horsepower. Yes, on the sheet it says flywheel. There is a function/setting on the dyno as to where it can read flywheel power. So lets say hypothetically Church's dyno was set to read flywheel power that day. Do the conversion. He saw an average gain of over 16 HP@ the wheels. Now in addition to that, dynapak's generally dyno lower due to the fact that there is no tire slippage. Reason being, there are no wheels on the car and it is more of an accurate number because it measures power at the hubs...
Tony
Last edited by FastIntentions; 04-30-2008 at 12:00 AM.
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