I've suggested many times over the last few months that ECT - Snow mode should be used for dyno testing, but I don't think anyone ever tried it. Instead, everytime someone posts a dyno plot showing anything below 4500 RPMS, they poop all over it. Well, quit! In ECT - Snow / paddle mode, you can go full throttle at 3K RPMs in 4th gear without a down shift.

Check out the graphs below showing the datalogs comparing PWR mode and Snow mode. Both were done in full auto shift mode. It is obvious that the difference is transmission behavior (and DBW response). BTW, the very slight difference in accelleration rates is due to the slight incline of the road. I was going up hill during the snow mode test, and back down the same hill while doing the PWR mode test. I didn't think about it until after I got back home...

BTW, I'm not going to answer any questions about how I captured this data. I am working on a project that I'm not ready to talk about.

This is a 1/8 mile plot of RPM in both modes. Note that ECT - Snow causes an earlier shift point.

 

This graph shows AFRs for both.

 

This shows throttle position (butterfly, not the pedal). My pedal was pushed all the way to the floor for both runs. I found it interesting that the throttle seems to fluctuate based on RPM...

 

Finally, MPH.

 

I don't think it is supposed to have more power.... just starts off in 2nd gear to you are less likely to have the traction issues in snow.

 

I datalogged gear selection too. Snow mode doesn't start off in 2nd gear.

 

Hmm interesting. Thanks for the post!

 

Great research.

 

What did you use to be able to log?

James

 

I dont think he wants to divulge this info just yet..

 

I'd like to see some results with "regular ECT mode" too...or is it just pretty much "in between the two"?

Cool graphs by the way

 

Nice work. Keep working that project, I think the fruits of your labors will be well worth the effort. Thanks!

 

Gernby, if the throttle modulation occured on acceleration it may be related to the traction control, but knowing how complicated our cars are it's probably tied into the FAR, transmission, and traction.

 

Huh? I didn't disable TRAC or VSC during this test, and VDIM kicked in on both runs when I hit the gas and got a split second of sheel spin. Both runs were done on really grippy, new, dry concrete.

 

Yep, just to clarify, I was referring to your observation that the throttle plate was modulating with the pedal pushed to the floor, so just putting forth what may have caused it,...VDIM.