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    • Dynojet vs. Dynocom - Comparing an F80 M3 on the RK Tunes FX-5000 Dynocom to the Maximum PSI Dynojet

      A recent article about an RK Tunes BMW F87 M2 Competition had various people questioning the results or stating a Dynocom reads very high. This is the problem when comparing numbers from different dynos. It is hardly a uniform affair.


      What one should focus on is the delta meaning the difference between the baseline graph and tuned graph. People like to compare peak numbers for bragging rights and here we are.

      In the experience of BimmerBoost Dynocoms do tend to read higher than Dynojets. That is, usually. Do not think there is no variance among Dynojets. Not too long ago when people switched from Dynojet Winpep 7 to Winpep 8 software peak output on past runs also changed.

      Dyno numbers and output are not static. You can see in the video Jordan of RK Tunes tells you originally this car did read higher on his dyno but for whatever reason it is now reading similar to the Maximum PSI Dynojet.

      This car is not running a tune from RK Tunes but it is tuned with bolt ons for E85.

      The point? Don't always assume to know how a dyno reads or that it will always read the same. Experience tells us there is variance.

      Generally, expect if a car puts down a certain number on a Dynojet it will put that number down on a Dynocom but not the reverse. Again, generally. Ultimately, gather as much data as possible.

      Dynojet:


      Dynocom:




      This article was originally published in forum thread: Dynojet vs. Dynocom - Comparing an F80 M3 on the RK Tunes FX-5000 Dynocom to the Maximum PSI Dynojet started by Sticky View original post
      Comments 7 Comments
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        So this guy $#@!ed, and whined as he likes to do until you made this post? FACT: Both in SAE correction a dynocom will ready 15-20% HIGHER than a dynojet. I do not care what Jordan wants people to believe. This is a fact which has been tested many times. His numbers are inflated, and its great for him selling tunes. That video is laughable, like actually laughable. If he wants to back up his claims. Take his car to a dynojet that he is not affiliated with, and RUN THE CAR. Do not post a video of smoke, and mirrors, well you see what had happened was... the "1000WHP" RK M3 is actually an 850WHP M3, any numbers that come from RK's dyno subtract 15-20% to find real world. Case closed
      1. s13viper's Avatar
        s13viper -
        Click here to enlarge Originally Posted by Tony@VargasTurboTech Click here to enlarge
        So this guy $#@!ed, and whined as he likes to do until you made this post? FACT: Both in SAE correction a dynocom will ready 15-20% HIGHER than a dynojet. I do not care what Jordan wants people to believe. This is a fact which has been tested many times. His numbers are inflated, and its great for him selling tunes. That video is laughable, like actually laughable. If he wants to back up his claims. Take his car to a dynojet that he is not affiliated with, and RUN THE CAR. Do not post a video of smoke, and mirrors, well you see what had happened was... the "1000WHP" RK M3 is actually an 850WHP M3, any numbers that come from RK's dyno subtract 15-20% to find real world. Case closed
        That may be the case, but I still think any dyno is fine if all you are looking for is the delta and ignore the peak numbers.

        FWIW - Us aussies think ALL of the American dyno's read WAY too high. My 480whp (dynodynamics) RS3 trap's 130-132mph
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Tony@VargasTurboTech Click here to enlarge
        So this guy $#@!ed, and whined as he likes to do until you made this post?
        No. He just sent me some vids and graphs.

        Click here to enlarge Originally Posted by Tony@VargasTurboTech Click here to enlarge
        FACT: Both in SAE correction a dynocom will ready 15-20% HIGHER than a dynojet. I do not care what Jordan wants people to believe.
        All he did was show some runs and he did show some initial runs that read higher.

        Click here to enlarge Originally Posted by Tony@VargasTurboTech Click here to enlarge
        any numbers that come from RK's dyno subtract 15-20% to find real world. Case closed
        Ok so he should go buy a new dyno or something now?

        I know you don't like him but what exactly is he doing wrong here? Seems he was pretty up front.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by s13viper Click here to enlarge
        Us aussies think ALL of the American dyno's read WAY too high. My 480whp (dynodynamics)
        That is only because the Dyno Dynamics reads so low. Plus it had a billion modes that make comparisons impossible.
      1. maximumpsi's Avatar
        maximumpsi -
        Not trying to start a war, but here are some facts:

        Those dynojet runs were from my shop, from Carythelabelguy tuning my customer's car. It was from before we were doing any F series work with Jordan. The dynocom runs were Jordan baselining the same customer's car without tuning it yet.

        Regarding Jordans single turbo car:
        My F80 ran 119 mph in the 1/8 with ~82X whp. His ran 124 in the 1/8 so far. I cant post links here but the slips are in articles on this site. Both cars are full weight, non-stripped cars. His trapped 5mph more in the 1/8, so it was making more power. Not sure about nitrous, powerband, etc, but definitely more than 820whp.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by maximumpsi Click here to enlarge
        My F80 ran 119 mph in the 1/8 with ~82X whp. His ran 124 in the 1/8 so far. I cant post links here but the slips are in articles on this site. Both cars are full weight, non-stripped cars. His trapped 5mph more in the 1/8, so it was making more power. Not sure about nitrous, powerband, etc, but definitely more than 820whp.
        https://www.bimmerboost.com/content....nd-running-9-s

        5 more miles per hour in the 1/8 than your 149 1/4 trap car is no joke. He's clearly making the power and well into the 150's...
      1. Mikecoupe's Avatar
        Mikecoupe -
        That is some REAL proof instead of crying about dyno numbers,but hey Tony@Vargas has a N55 11.7/122mph 1/4 recordClick here to enlarge