997 Turbo / GT2 2006–2012 Turbo discussion on the 997 model Porsche 911 Twin Turbo.
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997TT won't run on DYNOPACK..

Old Jan 2, 2009 | 02:31 PM
  #16  
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I must be dense and I apologize but I am still not clear on the Dynapack dyno functioning.
How does it record whp when there are no factors of wheel / tire weight and surface rolling resistence?
How does the issue of drivetrain loss factor into play or if it does at all?
It seem to me that it would yield a higher hp figure?
How does this all compare to a Dynojet dyno which has not been mentioned?

Thank you

Ranger
 
Old Jan 2, 2009 | 03:04 PM
  #17  
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Originally Posted by GT3Ranger
I must be dense and I apologize but I am still not clear on the Dynapack dyno functioning.
How does it record whp when there are no factors of wheel / tire weight and surface rolling resistence?

IT connects directly to the wheel hub and uses hydraulics to create resistance in lieu of a weighted drum.

How does the issue of drivetrain loss factor into play or if it does at all?

It's the same as any other dyno. However, drum weight inconsistencies, tire pressures, strap tension, and all the other normal roller dyno variables don't come into play.

It seem to me that it would yield a higher hp figure?

No, they're generally lower but very very consistent. They also offer the ability to hold a certain rpm so that you can due real time fuel mapping.

How does this all compare to a Dynojet dyno which has not been mentioned?

See my above responses

Thank you

Ranger
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