Quote:
Originally Posted by obeeone
Hello Thejeremyman9,
I have been following a lot of your posts as you have taken a very methodical approach to recording your data during upgrades etc. and as an engineer I love data, most days anyway.
I just started upgrading my car a few weeks ago and wish I had done more data logging while completely stock, but didn't think about just buying the MHD logging feature without buying the flasher module until I had already installed my VRSF DP, CP and 6.5 hd intercooler.
Anyway, I started logging and playing with virtual dyno to start recording things prior to flashing and I am seeing a wide variance between almost identical runs and was curious if you found the same using virtual dyno? Attached are runs only 3 minutes apart, but widely different results. Any ideas? Thanks
Also the associated data logs for reference:
http://https://datazap.me/u/obeeone420/dp-cp-65hd-intercooler?log=1&data=3-16
https://datazap.me/u/obeeone420/dp-c...og=0&data=3-16 |
First, you need to go into settings and enable more parameters to be logged. You dont even have vehicle speed, MAP, or timing corrections that i saw. You might need to actually install MHD to get some of these, i can't recall.
In terms of the results, it looks like these are not clean runs. You have several jumps in RPM, especially in the 2nd log. Either you were hitting bumps in the road, you were getting wheelspin, or your clutch was slipping if you are 6MT. You need a very smooth road with no bumps or wheel spin to have virtual dyno read correctly. Your RPM need to be a smooth curve.
Aside from that, the other thing i would note that is timing plays a huge role in power, as i described in my posts above. Inconsistent timing between two pulls done back to back will cause a big difference, and i think my post above illustrates that.