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New Cams, not happy with dyno

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  #11  
Old 03-13-2019, 09:16 AM
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Originally Posted by Sierra977
That issue addresses one of the fallacies that many people have about dynos. That there is consistency between dynos.

Nothing could be further from the truth.

In truth there is little consistency between different dynos. Or even the same dyno with different operators. Or the same dyno with different setup settings.

A dyno operator can get a dyno to produce a torque number within a wide range of values.

The only real value I have for dynos is to comparison test different engine setups using the SAME dyno with the SAME operator and the SAME setup settings and hopefully the SAME atmospherics. And being hopeful the operator is actually trying to be consistent. A dyno is useful for comparison testing and that is all.

A resourceful dyno operator gives his customers the results they want to see and produce more return business for himself.

Comparing charts from different dynos is an exercise based on a false premise.
I strongly disagree. From a guy that has owned his own and operated a dyno for over 10 years.
 
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  #12  
Old 03-13-2019, 10:37 AM
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Originally Posted by Sierra977
That issue addresses one of the fallacies that many people have about dynos. That there is consistency between dynos.

Nothing could be further from the truth.

In truth there is little consistency between different dynos. Or even the same dyno with different operators. Or the same dyno with different setup settings.

A dyno operator can get a dyno to produce a torque number within a wide range of values.

The only real value I have for dynos is to comparison test different engine setups using the SAME dyno with the SAME operator and the SAME setup settings and hopefully the SAME atmospherics. And being hopeful the operator is actually trying to be consistent. A dyno is useful for comparison testing and that is all.

A resourceful dyno operator gives his customers the results they want to see and produce more return business for himself.

Comparing charts from different dynos is an exercise based on a false premise.
It's sad to say but there is lots of truth in what your saying. The problem comes from those who set out to fool the public with false dyno reports as you can trick the dyno. Those of us in the industry know who the ones are that play the games with there charts and once you learn to see the tricks you can spot them in there charts. Then when they get caught at it, they come up will all kinds of excuses as to why.

All it does is hurt the industry as a whole and hurt those who really are doing good work and provide honest dyno charts!
 
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  #13  
Old 03-13-2019, 11:25 AM
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Those numbers look about right for the build.
 
  #14  
Old 03-13-2019, 11:27 AM
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With the scaling on the second graph, there’s no telling what the actual AFR is doing.
 
  #15  
Old 03-13-2019, 11:48 AM
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IMO if you want to see the improvement from the 570-2 over the stock Rushmore cams, you need to start the runs 1,000 RPM sooner.
 
  #16  
Old 03-13-2019, 12:23 PM
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Originally Posted by rigidthumper
IMO if you want to see the improvement from the 570-2 over the stock Rushmore cams, you need to start the runs 1,000 RPM sooner.
I agree 100%.

Why did he start the tune at 2,800 RPM's?
 

Last edited by Yo_Boss; 03-13-2019 at 12:24 PM.
  #17  
Old 03-15-2019, 12:17 PM
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Originally Posted by Yo_Boss
I agree 100%.

Why did he start the tune at 2,800 RPM's?
I was recommended the 570-2 as a good tq cam from jamie for basically the same type of setup. Idk what my numbers are as i didnt dyno it but i felt a difference. Idk if it was a huge difference but i felt it
 
  #18  
Old 03-18-2019, 07:58 PM
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Originally Posted by Sierra977
That issue addresses one of the fallacies that many people have about dynos. That there is consistency between dynos.

Nothing could be further from the truth.

In truth there is little consistency between different dynos. Or even the same dyno with different operators. Or the same dyno with different setup settings.

A dyno operator can get a dyno to produce a torque number within a wide range of values.

The only real value I have for dynos is to comparison test different engine setups using the SAME dyno with the SAME operator and the SAME setup settings and hopefully the SAME atmospherics. And being hopeful the operator is actually trying to be consistent. A dyno is useful for comparison testing and that is all.

A resourceful dyno operator gives his customers the results they want to see and produce more return business for himself.

Comparing charts from different dynos is an exercise based on a false premise.
I'm sorry you missed the sarcasm in that one statement you pulled out of my entire post, but it's there if you look for it...
 
  #19  
Old 03-23-2019, 08:03 AM
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Originally Posted by SA66
I went to my local HD dealer, same dealer that did it 4 years ago. I think I will have it re-tuned by either Roeder, Fox or Mozaic, all in the same area in Ohio
There's your answer.
 
  #20  
Old 03-23-2019, 11:43 AM
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Originally Posted by harleytuner
There's your answer.
good advice from someone who is worth listening to right here!
 
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