ECT Snow vs ECT PWR data logs show NO difference in power
10-08-06, 05:53 PM
#1
Dyno testing should be done in ECT Snow
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.
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.
Last edited by Gernby; 10-10-06 at 01:56 PM.
Thanks for the post!
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10-08-06, 07:11 PM
#8
Lexus Connoisseur
Great research. 
10-08-06, 10:28 PM
#10
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10-08-06, 11:19 PM
#12
Tech Info Resource
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Nice work. Keep working that project, I think the fruits of your labors will be well worth the effort. Thanks!
10-09-06, 09:29 AM
#13
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.
10-10-06, 01:18 PM
#15
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.