46 MPH is the new threshold for STEALTH

Sort of a side issue to the point of the thread, but since you mentioned it ....

Some time ago a few of us reported discrepancies between each other's LOD readings at various speeds and RPM. Between that discussion and some elsewhere (including this one, beginning at post #14), some of us have come to believe that Toyota changed the way it reports LOD somewhere between the earlier NHW20 models (2004 & 2005, at least) and the later models (by 2007 at the latest). It seems reasonable to assume that they chose the later calculation method for the 2010. If so, it makes LOD comparisons between 2004 and 2010 unreliable.

 

On a 2004-2009 model there is an easy way to discover this via service menus on the GPS data screen.

Is there a service menu on the 2010 as well? Does the trick to pop up the service menu on a 2004-2009 work on a 2010? As anyone tried it yet?

 

I now understand the terminology and awaiting the opportunity to put into practice. Thanks folks!

More of a technical / operational question. Of course the ICE on/off is computer controlled.
In general, how quickly does the ICE shut down, as in these examples (assuming normal drive mode, discounting A/C use):

A. Driving 40MPH and you let up on the accelerator for about 5 seconds as the driver just ahead is a bit slower, to drop speed to 38.

B. Typical city stop and go driving - does the ICE turn off immediately when applying the brakes for the quick stop&go for a stop sign? Or when stopped? Or a bit of a delay in the case of re-accelerate after the quick stop.

C. Driving about 30MPH, need to slow for a 25MPH curve. Car coasts around the curve for 10 seconds then accelerate up to 30 again.

Is the entire programming for the timing of ICE shut down factory set?
Does the system "learn" an individual driving habits as some other vehicles (for elec transmission) advertise?
No doubt a Prius engineering formula for fuel savings - keep the ICE running for X time -vs- shutdown and power up in X time.

Just wondering how many times in general the ICE fires up and cuts off in typical driving situations.

 

I found the indicated speed to be 1 mph high compared to a Garmin nuvi GPS but the trip meter average is accurate.

Bob Wilson

 

Anybody noticed any increase in regen over Gen II? Either by feel or increased current on the gauges?

 

That extra 3 mph of stealth matters not to me, but I'm sure many a person behind a G3 will appreciate it

 

I am soooo glad that someone cleared up my own misconceptions. for some reason when I kept reading that ev only worked up to 25 mph, I thought that meant stealth too. hopefully I'm not the only one to make that mistake.

 

I'm 90% sure it is gone. Now some of the warmup still has me scratching my head. For example, on a 57F morning, the one minute display showed two, ~25 MPG bars, a 100 MPG bar, and a 25 MPG bar. Then there was ramp up to steady 65-75 MPG bars that took about 10 minutes. Without adequate instrumentation, I'm really not sure what is going on but I am very confident that final S4 "stop until engine stop" nonsense is gone.

Bob Wilson

 

Hi Bob,
Thank you for your response.
My 2010 Prius will be delivered on June 5th. I'll try to find the offset on the Japanese model.

Ken@Japan

 

There is still a significant warmup phase although it is very different then the Gen II. We just need someone to document it.

The good news is that I am very sure that it is not as severe as the Gen II,

 

The above post has the potential to create some misconceptions for newer folks and how efficient Prius driving is done.
Stealth, EV, glide and coast are not the same. Not at all. Each one of these is a very distinct and different forms of ICE-off movement of the Prius that are attainable by simple and small gas pedal manipulation.
Stealth is electric operation below 42 MPH (yellow arrows from battery)
EV is electric operation below 34 MPH induced with the use of an "EV" switch that some have installed on a 2cd gen. Prius.
Glide is movement with no arrows (most efficient method) and easily attainable below 42 MPH with simple gas pedal manipulation.
Above 42 mph this same technique will most likely result in Warp Stealth, where you'll have yellow arrow from battery only. Also, Basically electric operation although the engine in recipricating with little fuel burn.
Simply taking your foot off the gas pedal results in Regen ("coasting" is not an applicable word in the Prius.) Regen is where the ICE shuts down and the rotation of the wheels in used to regenerate a charge to the battery. Neat, but it drags the car's speed down, so you would only use it when stopping, slowing, or speed midigation is necessary.
Understanding these terms and putting it to efficient, common sense use is truely taking advantage of what a hybrid like the Prius is all about.
Confusing these terms will cause someone to think they are doing something they are not. And cost them MPG

So, it appears stealth and true glide ability have been raised to 46 mph in the Gen 3.

 

So a EBH might help like the Gen II. The warm-up profile graph said you still have about the first 5 minutes of just engine warm-up before Exhaust Heat Recovery really kicks in, only without the thermos injection. I think I'll still be enjoying my hobby.

Wayne

 

Warp Stealth - Over 47 MPH (42 for Iconic model), release the accelerator and feather it so the arrow flows from HV battery to wheels.

A question about 2010 Warp Stealth....

What RPM does the ICE remain at? The Iconic model stays below 1,000 RPM, around 960 RPM.

 

sweet 4mph gain is welcome, now 2010 owners can adequately keep up with traffic a bit easier when "stealthed "

 

I haven't measured this with a separate GPS unit, but I've been wondering at the reported "Set" speed on the cruise control. When I set the cruise control (and Radar is on, using the Adaptive Cruise Control), the reported "Set" number is 1mph higher than the indicated speed on the speedometer.

 

I have owned Gen I,II and now III. "Warp Stealth" seems to significantly more difficult to obtain on Gen III. I had it wired on Gen II, but the same stretches of highway that I could warp on in my 2004 are not NEARLY as easy to eliminate the "red arrows" on the gas engine side. However, the dang thing is so quite, I'm having trouble telling whether the engine is really turning/using fuel or not. Any opinions from the tech guru side on this issue? Is the 2010 harder to get into warp stealth or is the information feed different making me THINK it's harder??