70 mph EV only mode.

[aminorjourney]

Wow.

Chris Ewart, one of the fantastically talented reverse-engineers of the plugin prius scene, has just released this video:

YouTube - Prius 70 MPH Electric Mode: Ewert Energy Demo

YouTube - Prius 70 MPH Electric Mode: Ewert Energy Demo

He's figured out how to get 70 mph all electric performance out of the Prius and has also figured out how to get past the limitations of the OEM motor controls.

I suspect he's done something similar to the mod done by Toyota in their OEM prius plug ins....

Whatever and however he's done it. Congratulations Chris. I can't wait to see it in a conversion soon. (apparently the conversion high speed option will be offered by Plug-In Home soon)

[Mesuge]

Exciting news, so that was the upcomming big press release they and friends talked about! Well, we knew that >52mph is technically possible to get out of Toyota's HSD, but is it safe for the MG1&MG2 over the longhaul? For more info/links on Ewert Energy (formerly engaged in CalCars PriusPlus) projects check my posts at page #28 of your "Bristol PHEV" thread..

[bwilson4web]

Excellent work! It looks like they were drawing about 100A at around 200V, about 20 kW or about 27 hp. There were some interesting spikes but short of doing a frame-by-frame analysis, this was just a raw impression.

Bob Wilson

[Flying White Dutchman]

this is great but to me not new.

i see that when in this enhanced EV mode a virtual SOC of 74% or for the prius a 100%(real74%) full battery and between the `( )` the real SOC.

so to me this is the same hymotion and norm with the BMS± is doing

fake the SOC so the prius thinks it needs to get some more energy out of the battery pack because its getting to full and wants to protect the battery.

i can drive 100kmph without using the ice because of this with the BMSplus and have been doing this for several months now.

[Mesuge]

Bob, correct. But this is for steady cruising only, another question is acceleration up to that max. speed point, and there comes the limit of ~50kW MG2 motor and the battery/bms system involved. Obviously, the more agressive aero&weight mods performed to stock Prius the better accel. & cruising economy combined in the end..

But the best kick from this kit is the above 52mph smooth switching between all those PHEV/EV modes..

[alevinemi]

Is this a good idea?

I thought a safety was put in because if you were past 60MPH or so and let up on the gas, engaging regenerative breaking, it would spin too fast for the motors.

-->Adam

[EZW1]

Furthermore, and someone chime in here to correct me, but I believe the HSD is lubricated from an oil pump driven off the ICE. If the ICE is still, there is no lubrication of the HSD and driving at 75MPH in such a mode would create undue stress/wear.

[efusco]

I'd sure like to know what the inverter temps were and MG1 rpm with that sustained 100-130 amp draw at those speeds.

While I share the excitement that this can be achieved, I don't think it's a good idea.

[TheForce]

With the Hymotion battery if you draw anything over 30A the stock battery will start to lose its SOC. When that happens the Hymotion battery starts to lower the fake SOC. If the stock battery SOC gets to low the fake SOC gets to low and the car starts to go back to lower than 70MPG in blended mode.

If I were to do what Chris did with my Hymotion battery I think I would damage both batteries pretty quick. They must be using a different method or replacing the stock battery with a custom one so they can draw 100+A like that without problems. Does anyone know what they are doing exactly?

[Flying White Dutchman]

is the hymotion using a dc/dc converter or higher voltage addpack to charge the oempack and provide extra energy to the prius ev system.

looking that the voltage also went up when using the enhanced ev mode in that video i think its a bigger and better chemistry battery pack with a dc/dc converter and bigger wire´s then there is no problem the hymotion pack is not that big in kwh.