Thread: Virtual Dyno

No smoothing:



Smoothing factor of 1:



Smoothing factor of 10:



Remember the car made 267.

I can provide screen shots of the vehicle speed curve which clearly shows acceleration falls off near the top of the gear as you would expect for a car with an M90 and rockers. This also suggests torque is falling off, yet this program suggests the opposite.

Here are the same graphs with third gear pulls as well:







If all you're looking for is change in performance, just calculate average acceleration.

Also which tire diameter is this thing supposed to use? Actual or theoretical? Doesn't specify and automatically selects theoretical.

Originally Posted by matt5112

Also which tire diameter is this thing supposed to use? Actual or theoretical? Doesn't specify and automatically selects theoretical.

This.

By actual, I mean effective. Since we have significant sidewalls, 225/60R16, the deformation makes the effective radius of the tire around 25.71-25.84 (GT lists first size, GTP lists second)

Also curious as to why there is no compensation for torque converter slip.

In that red curved I removed the last data point and it jumped back to the next high of ~330 HP. Still nowhere near accurate because of spikes.

The light green pull is the most believable curve however, does it consider air drag? Third gear covers ~84-125 mph. Significant increase in rolling resistance up there. If anything though, it seems to think there is more drag than what was seen by the vehicle.

Based on how sensitive this program is to bad data, I'm not sure it is worth using with our logs as they all seem to be error ridden.