AutoXer

iTrader: (1)

Does anyone have a file of raw numbers from a dyno? Kinda like:

RPM Torque
2000 80
2100 82
2200 84
(more)
7000 134

I think the "Road Dyno" gives a .csv file output.

I'm gonna do a little research on ideal shift points.

P.S. Please don't highjack this thread with a discussion of shiftpoints.

zyounker

iTrader: (1)

Mine. My mods are RMR intake and Greddy Type-S.


Drivetrain correction is set to 0.

xtnct

iTrader: (33)

Yeah, the Road Dyno has a CSV output file that gives that info. But, I think in order do do what you want, you'd need to run the road dyno in each gear and collect the data and then compare power at a given RPM from gear to gear. For example (just an example, the numbers or rpm's are not real),

Gear 1, 6000rpm = 100hp
Gear 1, 6500rpm = 110hp
Gear 2, 4500rpm = 115hp
Gear 2, 5000rpm = 120hp

You'd, want to actually shift sooner to drop to 4500 rpm to get 115hp as opposed to ringing it out to 5600rpm to just get 110hp.

I don't think that output will be the same for all gears, ie (again, example only), although it should be the same if proper gear calibration is done, right?:
Gear 1, 5000rpm = 120hp
Gear 2, 5000rpm = 120hp
Gear 3, 5000rpm = 120hp

But I don't know, never checked. Correct me if I'm wrong.... And on top of that you have the boost and torque factors too.

AutoXer

iTrader: (1)

The pulls should be very similar. The road dyno has to know what gear you are in, in order to derive TQ at the crank. You will have variations due to drag and a small amount due to boost variations.

Torque at the wheels is what dictates acceleration. Higher Torque at wheels = more accelration. If you scale the Torque at the crank through the gear ratios(the final ratio included), you will get Torque at the wheels. Plot all five gears on the same graph and you can get a better idea of where to shift to get you the most Torque at the wheels.

Our Torque does fall off at the higher RPMs. So, you could be making more TQ @ the wheels by shifting earlier.

AutoXer

iTrader: (1)

Check these out fellas. One is a graph of Torque at the wheel in each gear. The other is just a file with a few interesting equations partly involving converting an OBDII log into a torque curve. The OBDII dosen't seam to have a high enough sample rate to get a smooth graph.

Anyway.... see what you think.

AutoXer

iTrader: (1)

<shakes head> Always forgettin' to attach the files... here they are...

zyounker

iTrader: (1)

What did you not like my road dyno data?

AutoXer

iTrader: (1)

I like the road dyno data. I'm just curious as to how they cleaned up their "raw" data. Plot the raw data and see how jagged the line is. I get the same jagged line with my obdII data, I'm just not sure how to smooth it out.

Did you see my equation for determining TQ at the crank?