2010 Prius 2ZR-FXE engine efficiency map

[walter Lee]

Originally Posted by ken1784

Hello all,
One of Japanese Prius enthusiasts posted following charts on our community.
He agreed to post them here on PriusChat.

edit: the charts source: Toyota's article titled "Development of New 1.8-Liter Engine for Hybrid Vehicles" which was published at JSAE academic conference in May 2009.

The new 1.8L 2ZR-FXE engine is much more efficient than the previous 1.5L 1NZ-FXE engine.

Both engines trace most efficient area depending on power demand, and the 1.8L engine runs very efficient 220g/kWh area in the most useful medium rpm range.

Please note that the 1.8L engine's rpm number, for the 40kW output, is lower (3650rpm & within 230g/kWh area) than 1.5L's (4000rpm & out of 230g/kWh area).
I believe the vehicle cruising speed by 40kW is approx 95mph, and we can see the turning point at 3650rpm to get more torque than efficiency for higher speed.
It looks Toyota is trying to compete European diesels on 90mph cruising German autobahn.

Enjoy,
Ken@Japan

At 4000 RPM a Prius must be moving along
the highway like a crazed demon from hell.

[spwolf]

this is europe.

my 88hp nissan moved at 100mph with no problems for 600 miles the other day :-)

[FrankTiger]

Originally Posted by Tom183

Anybody know the power curve for a cold 1.8L engine?

Hi Tom

Actually it does make a lot of sense. I'm capturing OBDII data and this is the plot you asked for. It seems that there is a different path (in light-blue) for revving when the coolant temperature is below 70ºC (158ºF)

Big hugs from Frank



[Click here for zoom]

[Currawong]

Originally Posted by walter Lee

At 4000 RPM a Prius must be moving along
the highway like a crazed demon from hell.

That's what got me interested in the car in the first place: I saw a 2010 model accelerating at a speed I didn't think a hybrid could do. I wouldn't call my 2011 a highway demon, but I have caught myself going at speeds way above what I intended without realising.

I found I can enact some fun by putting the car both in power and the gear selector in B (to keep the ICE running) then it's possible make very quick progress when there is little traffic in the way. I wish I'd owned this car back in Australia.