RPMs at 75 MPh

Batavier · 08-27-2004, 07:54 AM

Like the topic said, I was wondering how many RPMs the engine 'makes' when driving at that speed. I know it will probably vary a bit due to the eCVT in the car, but since it's a speed I often use (= maximum speed on the highway over here) I was just curious.

Maybe one (or more) of you peeps know.

**efusco** · 08-27-2004, 08:13 AM

I'll check Wayne Brown's simulator when I recharge my PDA...damn batteries are dead. Unless someone beats me to it.

bruceha_2000 · 08-27-2004, 08:17 AM

Quote:

Originally posted by efusco
I'll check Wayne Brown's simulator when I recharge my PDA...damn batteries are dead. Unless someone beats me to it.

I think you'll probably recharge them before anyone else ;-)

jamarimutt · 08-27-2004, 12:27 PM

Based on what I've read, it should be maximum rpms- a whopping 5,000 :mrgreen:

htmlspinnr · 08-27-2004, 01:24 PM

That depends. At full acceleration, max RPMs can happen after 45-50 mph. The Classic Prius didn't hit max RPM until 62mph.

Cruise RPM however can be less, and depending on whether you buy into the "undocumented" heretical mode, where MG2 acts at the generator and MG1 acts as the drive motor (reversed roles) to force an overdrive situation, it could be much less. Scanner data tends to prove it's possible.

Frank Hudon · 08-28-2004, 12:06 AM

flat ground steady state 130kmh should yeild about 2500RPM. It will vary with load and hills etc. but that would be a best guess. The PSD makes rpm very much a guessing game. To watch the rpm on cruise and what looks like flat ground and your asking why are the rpm's climbing and on the same road other direction and the rpm are dropping that tells you your eyes are lying to you on the "flatness of the ground". following at truck at a reasonable distance will change the rpm also, it's just not what most would consider an important reading anymore.

**efusco** · 08-28-2004, 12:15 AM

I played around with the THS II simulator tonight (finally got around to charging the battery!).

There's no one answer. At a minimum the RPM must be 262 RPM, even if coasting due to the 10k RPM limit of MG1.

You can run the RPMs up to 5000 on the simulator program and MG1 is just going 7059 RPM while MG2 is going 4208 RPM.

Thus, I conclude that there's no one correct answer. Frank's guess may be really close, but it's darn hard to tell. I think Eisenson got his tach installed and may be able to give us a range of RPMs when at steady state on flat terrain for the ICE.

Frank Hudon · 08-28-2004, 12:47 AM

Batavier have a look at this url and just select the ths and ths11 button and then hit the sliders and you'll see what all is happening. It'll make the psd easier to understand also.
http://homepage.mac.com/inachan/prius/planet_e.html

Batavier · 08-28-2004, 03:49 PM

Ah, thanks all!

I was just asking because sometimes the engine seems to 'race' when I drive a steady 124 km/h on the speedo. But not always it seems, it's hard to determine because it's hard to hear the engine.

Which is a good thing of course.

Nice link there, Frank! Ta for that.

08-27-2004, 07:54 AM	#1
Batavier Senior Member Join Date: Mar 2004 Location: The Netherlands Posts: 431 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	RPMs at 75 MPh Like the topic said, I was wondering how many RPMs the engine 'makes' when driving at that speed. I know it will probably vary a bit due to the eCVT in the car, but since it's a speed I often use (= maximum speed on the highway over here) I was just curious. Maybe one (or more) of you peeps know.

08-28-2004, 12:06 AM	#6
Frank Hudon Senior Member Join Date: Jan 2004 Posts: 4,144 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	flat ground steady state 130kmh should yeild about 2500RPM. It will vary with load and hills etc. but that would be a best guess. The PSD makes rpm very much a guessing game. To watch the rpm on cruise and what looks like flat ground and your asking why are the rpm's climbing and on the same road other direction and the rpm are dropping that tells you your eyes are lying to you on the "flatness of the ground". following at truck at a reasonable distance will change the rpm also, it's just not what most would consider an important reading anymore. __________________ You can quote me on this, People who drive vehicles that idle at a traffic light, are idiots. mine 2k3 avg. 5.36 for 46,915Km Best tank 4.4L per 100K 64.2 Imperial 53.4 U.S. gallon, MiniScanner, SilverStars, block heater, winter lips, in as of Oct 15, out on April 25. In again on Sept. 21st. her's 2k4 "B" avg. 6.01 for 42,317 Km Best tank 4.02L per 100K, CAN-view with OBD11 module and flashloader, SilverStars, 06 Chrome grill bar, Michelin HydroEdge, upper and lower grill blocker,upper out as of April 7, lower out on April 28. In again on Sept 21st.

08-28-2004, 12:15 AM	#7
efusco Troll Slayer Join Date: Nov 2003 Location: Nixa, MO Posts: 14,252 My Car: 2004 Prius Package: #9 Nominated 1 Time in 1 Post TOTM Awards: 0 Friends: 24	I played around with the THS II simulator tonight (finally got around to charging the battery!). There's no one answer. At a minimum the RPM must be 262 RPM, even if coasting due to the 10k RPM limit of MG1. You can run the RPMs up to 5000 on the simulator program and MG1 is just going 7059 RPM while MG2 is going 4208 RPM. Thus, I conclude that there's no one correct answer. Frank's guess may be really close, but it's darn hard to tell. I think Eisenson got his tach installed and may be able to give us a range of RPMs when at steady state on flat terrain for the ICE. __________________ Evan E. Fusco, MD Seaside 04BC9/OEM EVb/NAV & auto-BT/XM Radio, CAN-View, Shark Fin, BT Stiff. Plate, Skid Plate & Strut Support

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08-27-2004, 08:13 AM	#2
efusco Troll Slayer Join Date: Nov 2003 Location: Nixa, MO Posts: 14,252 My Car: 2004 Prius Package: #9 Nominated 1 Time in 1 Post TOTM Awards: 0 Friends: 24	I'll check Wayne Brown's simulator when I recharge my PDA...damn batteries are dead. Unless someone beats me to it.

08-27-2004, 12:27 PM	#4
jamarimutt Join Date: May 2004 Posts: 972 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Based on what I've read, it should be maximum rpms- a whopping 5,000 :mrgreen:

08-27-2004, 01:24 PM	#5
htmlspinnr Senior Member Join Date: Dec 2003 Location: Surprise, AZ (Phoenix) Posts: 1,305 My Car: 2004 Prius Package: Pioneer #3 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 1	That depends. At full acceleration, max RPMs can happen after 45-50 mph. The Classic Prius didn't hit max RPM until 62mph. Cruise RPM however can be less, and depending on whether you buy into the "undocumented" heretical mode, where MG2 acts at the generator and MG1 acts as the drive motor (reversed roles) to force an overdrive situation, it could be much less. Scanner data tends to prove it's possible.

08-28-2004, 12:47 AM	#8
Frank Hudon Senior Member Join Date: Jan 2004 Posts: 4,144 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Batavier have a look at this url and just select the ths and ths11 button and then hit the sliders and you'll see what all is happening. It'll make the psd easier to understand also. http://homepage.mac.com/inachan/prius/planet_e.html

08-28-2004, 03:49 PM	#9
Batavier Senior Member Join Date: Mar 2004 Location: The Netherlands Posts: 431 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Ah, thanks all! I was just asking because sometimes the engine seems to 'race' when I drive a steady 124 km/h on the speedo. But not always it seems, it's hard to determine because it's hard to hear the engine. Which is a good thing of course. Nice link there, Frank! Ta for that.