I know that this is supposed to represent an uncorrected dj number, my question is as follows:

Would it be logical to say, for comparison sake, that an actual log on a dj with occupant weight of 0lbs will yield a number within +/- 3% of the actual dyno number, and it could be used to compare an accurate road log w/ occupant weight?

I am trying to find what would be the most accurate way for me to compare where I was @ a dyno day to where I am right now with the addition of a few mods and switching to V7.

Thank you for any input.

 

Nope. Logs taken from on a dyno dont work.

Best way to compare to real dyno is to do road pulls right before or right after the dyno pulls, making sure boost, timing and AFR are all the same.

 

Ok, thanks for the quick answer.

 

Good info!

 

This is a really nice article on how to use it correctly, i would still go to a dyno though, maybe for people that don't have a dyno near them would be more than awesome to have.

 

Is anyone using the CF on their VD and should they? I'm at over 5000' and a local forum says that it's common to use a 1.2 CF for this elevation, but to post uncorrected as well as corrected on their site. Is there a rule here too?

 

First of all, a CF of 1.2 is too much. I have no idea why high elevation people over correct.

To correct for 5000' elevation, use a baro of 24.9.

 

Thanks Jay, but when I put that in it increases the hp/tq past 1.2 CF hp/tq numbers. How did you get 24.9? Is this suppose to be our barometric pressure. If so, I think we are around 30, which brings the numbers down.

 

Okay. But just leave the CF at default, then use the baro to correct for elevation. (When I was talking about 1.2CF being too much, thats for a real dyno. A real dyno is at 1.0 CF default, so when you do a 1.20CF, thats a 20% increase, which is too much. On VD, the "default" CF is 1.09, so using 1.2CF is a 10% increase. Anyways, read below to properly correct for elevation in VD.)

Sea level is 29.9 baro. 5000' elevation is 24.9. The "30" that your local weather tells you is a "corrected" baro reading for weather. Regardless, on VD, to correct for elevation, use the following chart and put the baro for your elevation into the baro box on the VD run.

http://www.sablesys.com/baro-altitude.html

 

Awesome!!! Thanks

 

What's the bare minimum I should be logging when using Virtual Dyno?

 

RPM and TPS.

 

Great thread! Thanks for sharing!

 

i'm running a 2011 manual lancer. any way to customize virtual dyno for 2nd gear pulls?

gear ratio:
2nd: 1.913
3rd: 1.333
4th: 0.972
final: 4.235

 

If the 2011 lancer is already in there, just change the 3rd gear ratio to your 2nd gear ratio. Then when you select 3rd gear in the gear dropdown, you'll know it's actually calibrated for 2nd gear.