[craz33]

Can someone explain to me what the CF smoothing number means on a dyno chart? I see some dynos with smoothing of 3 and 5 but I have no idea what that translates into. Thanks.

 

[westpak]

the higher the number the more it smooths out the curve taking out spikes or irregularities in the curve, if the curve is really smooth with a low smoothing then it is a nice tune without issues. Although the curve looks nicer with higher smoothing it may mask issues

 

[craz33]

Thank you for explaining this for me. I've been trying to get a better understanding of what I'm reading on dyno charts.

 

[i8acobra]

The correction factor corrects to sea level at a set temperature and humidity. SAE correction tends to be more accurate than Standard (STD) correction. The uncorrected number tells you how much you car is actually making in your location at the time of the run. Smoothing smooths out spikes in the dyno chart. It has nothing to do with the function of the dyno, only how your chart is displayed and printed. A high smoothing factor is good for showing your buddies, a low SF is best for tuning. It's easier to see inaudible detonation with a low smoothing factor.

 

[rtiid22]

QUOTE (i8acobra @ Jan 18 2008, 02:09 AM) index.php?act=findpost&pid=476985

The correction factor corrects to sea level at a set temperature and humidity. SAE correction tends to be more accurate than Standard (STD) correction. The uncorrected number tells you how much you car is actually making in your location at the time of the run. Smoothing smooths out spikes in the dyno chart. It has nothing to do with the function of the dyno, only how your chart is displayed and printed. A high smoothing factor is good for showing your buddies, a low SF is best for tuning. It's easier to see inaudible detonation with a low smoothing factor.

Okay, so.. I just redynoed my car today after to see hp/tq differences between stock and with an exhaust and at first it seems as if I lost 2-4 hp and about the same amount of torque but then after altering idk what it now shows that I've gained about 5hp and 4 tq to the wheels..

I compared my previous dyno chart to the one I got today from a the same dynojet and the only differences are humidity, temp and STD... the std on my stock chart was 1.02 and temp and humidity were lower then it was today. Today's chart was higher temps/humidity and a 1.03 STD.. Now, would that BS my numbers?

 

[i8acobra]

QUOTE (Rtiid22 @ Aug 15 2008, 01:01 PM) index.php?act=findpost&pid=550994

Okay, so.. I just redynoed my car today after to see hp/tq differences between stock and with an exhaust and at first it seems as if I lost 2-4 hp and about the same amount of torque but then after altering idk what it now shows that I've gained about 5hp and 4 tq to the wheels..

I compared my previous dyno chart to the one I got today from a the same dynojet and the only differences are humidity, temp and STD... the std on my stock chart was 1.02 and temp and humidity were lower then it was today. Today's chart was higher temps/humidity and a 1.03 STD.. Now, would that BS my numbers?

If you're comparing a STD graph to an STD graph, your numbers are accurate. The problems come when you try to compare an SAE chart to a STD chart.