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G35 dyno - why is it losing so much power at the wheels?

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  #31  
Old 02-10-2009, 05:42 AM
Ajax_Baltimore's Avatar
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Originally Posted by Trbulnt
There is no backforce on a turbo...If you have backforce on a turbo you have very bad things happening. Now to achieve even more efficiency factor in a nice ported intake, some cnc'd and ported heads, a very free flowing exhaust. etc etc.....or just do the smart thing for yourself and take it to a proven shop to have it all spec'd and installed properly.

oh yeah HKS SSQV FTMFW or Turbonetics Godzilla since it is called godzilla afterall!!

I just called to Confirm and Yes Baby Jesus is still Sad about this thread.
The backforce I was talking about was the backforce needed to generate the frontforce aka Newton's 3rd law not turbo chatter or whatever it's called when you have the wastegate/blow off valve not working properly

new thread.
 

Last edited by Ajax_Baltimore; 02-10-2009 at 05:54 AM.
  #32  
Old 02-10-2009, 07:46 AM
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Originally Posted by Ajax_Baltimore
Hmm...not sure if what you're saying here is applicable...power is going to be determined by the pressure in the combustion chamber - this opposing force is what generates the boost pressure agreed...but furthermore, a large diameter of the "straw" or small diameter isn't really going to make a difference...what matters is the pressure inside the straw...the diameter just changes the velocity of air, but the volume of air that passes through will remain the same at the same boost pressure (Bernouli's principle - a small straw will just have faster moving air than the big straw at the same pressure)


Perhaps that was a poor example I used to illustrate that point. But the topic was well covered by yourself and others
 

Last edited by Mustang5L5; 02-10-2009 at 07:57 AM.
  #33  
Old 02-12-2009, 01:08 AM
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Whatever is on paper subtract 30-50 hp off that, considering the weight of the car and that will be a rough estimate of the WHP.
 
  #34  
Old 02-12-2009, 07:53 AM
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Not necessarily.

As the car's power increases, power loss through drivetrain loss increases as well. It's usually a percentage. 15% for a manual and 17-20% for an automatic.
 
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