View Single Post
      03-28-2011, 01:16 PM   #153
crummer's Avatar

Drives: 2011 E92 M3
Join Date: Feb 2011
Location: Cbus, OH

iTrader: (1)

Originally Posted by spdu4ea View Post
Response: It does assume a normal distribution... However, a normal distribution seems to hold when I add additional tuners to the existing graph:

or if I use them to calculate a new standard deviation:

Day four, page seven, we have these two "gems" of information. Building on the original data the OP has now included several other tuners. (Hats off to tuners / members who may have contributed) Analysis from these other sources and the documentation from the OP begins to paint a telling picture of how abnormal the OE@Gintani dyno graph is.

Hats off to the OP for all of the work, I am not sure how many hours you have in this analysis, but your efforts to date have elevated the stature of the community.

Originally Posted by View Post
To Mike & Mike's dyno expert: Can you please show all dynos comparing "tractive effort" (measured, not calculated values) for all. (Tractive effort is what a dyno actually records/measures to the wheels. Other variables can be calclated) This is just nonsesse colating data from different dyno brands that read/interpret data in different ways. Tractive effort is measured to the wheel. Please show that for real transparency.

What you have successfully done is let all consumers know that "all dynos" can be manipulated with a little effort (this does not say much for those who practice in this). Why not dissect DynoJet or Mustang next??? Same issues will always exist.
Sorry, but I can't help but feel you are a half step behind the analysis here. Assuming the OP is not manipulating data behind the scenes or eliminating random oddities of data he is capturing, the analysis is showing that across 5 or so vendors, the deviation is within naturally occuring limits. If anything, through multiple data sets the OP is determining what acceptable limits are (tractive effort or not) and educating the consumer on how verify their dyno runs are not manipulated.

Originally Posted by View Post
BTW: Powerchip does not own, ever owned a dyno nor operated one. Other posts exist where Powerchip refute dyno testing, and do not believe dynoing is a real measure of their products performance. Please feel free to search.
Not relevant, don't care. Hopefully they consult dynomometer experts when they do decide to measure their software. Could be a smart business move as their primary business model is to make performance software not operate a dynomometer.

Originally Posted by View Post
I remember a "dyno shootout" which I gladly wanted to participate in. This was cancelled due to other tuners backing out. I am down for this to go ahead on an independant dyno anytime. Any one want to jump in the ring for real?

That would be a fun time and allot of work , but for now I think the community would settle for a 3rd party assesment of your software to verify your own dyno results.

Last edited by crummer; 03-28-2011 at 01:39 PM.