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| This is a discussion on Engine RPM @ 70 MPH within the Gen III 2010 Prius Technical Discussion forums, part of the Gen III (2010+) Toyota Prius Forums category; Does anyone know how many rpm's the engine is running @ 70 mph. Sure do miss a tach. Thanks... |
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Engine RPM @ 70 MPH
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10-07-2009, 03:28 PM
| #1 |
| Junior Member Join Date: Sep 2009 Location: Central Indiana
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Friends: 0 |  Engine RPM @ 70 MPH Does anyone know how many rpm's the engine is running @ 70 mph. Sure do miss a tach. Thanks |
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10-07-2009, 03:46 PM
| #2 |
| Senior Member  Join Date: Sep 2009 Location: Vernon Hills, IL
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Friends: 2 | Re: Engine RPM @ 70 MPH Bill, It depends. With a CVT (continuously variable transmission), factors such as engine load, vehicle load and terrain will affect engine revs. With cruise set, engine revs will climb when driving up a hill and drop when driving down a hill as the transmission seeks out the correct ratio for the circumstances. |
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10-07-2009, 04:08 PM
| #3 | |
| Junior Member Join Date: Sep 2009 Location: Central Indiana
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Friends: 0 | Re: Engine RPM @ 70 MPH Quote:
 Ok just a round about figure on a flat road, sunny day, no wind, 400 lbs of total added weight. I know the cvt wants to keep the engine in the sweet spot. Just curious. -Bill | |
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10-07-2009, 04:55 PM
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| SuperMID designer  Join Date: Dec 2003 Location: Yokohama, JAPAN
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Friends: 8 | Re: Engine RPM @ 70 MPH Following is a copy of my post. ----- The Japanese sales staff manual says following data at 120km/h(74.6MPH).
Ken@Japan | |||||||||
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10-07-2009, 05:45 PM
| #5 | ||||||||||
| Junior Member Join Date: Sep 2009 Location: Central Indiana
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Friends: 0 | Re: Engine RPM @ 70 MPH Quote:
Couldn't find that nfo when I did a search. | ||||||||||
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| The Following User Says Thank You to Bill075 For This Useful Post: | kgall (10-14-2009) |
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10-07-2009, 07:57 PM
| #6 |
| Tsar of all the Rushers  Join Date: Apr 2009 Location: Greenwood MS USA
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Friends: 3 | Re: Engine RPM @ 70 MPH If you are curious how much it can vary, you can use this simulator. 114 km/h is about 70 MPH A simulation of Prius's Planetary Gear In theory, it can be anywhere from idle. (1000 RPM) to redline (5000 RPM) |
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10-09-2009, 05:32 AM
| #7 |
| Member Join Date: Jul 2009 Location: Baltimore, MD
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Friends: 0 | Re: Engine RPM @ 70 MPH I just bought a ScangaugeII (I, too, miss a tach) and I guess I can understand why a tach wasn't included in the MFD. Even at a steady/high speed, the rpms are all over the place. And, especially coming from a type-S RSX, they are *way* low. Amazing to see the slightest downhill drop the engine speed to ~ 900 rpm even at 70+. Generally (anecdotally), it seems to run about 1800-2500 at highway speeds. Gotta keep those eyes on the road... T btw the scangauge is cool  |
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10-09-2009, 07:59 AM
| #8 | |
| Senior Member Join Date: Aug 2008 Location: Reading, UK
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Friends: 0 | Re: Engine RPM @ 70 MPH Quote:
The key point is that the combination of motor and engine torque has to balance the current road demand, with just enough power being produced to keep the electronics running (base load: 300-400W). Otherwise the battery will be slightly charging or discharging. In practice this means the engine has to run a lot faster than the limitations of that simulator would suggest. For a road speed of 113km/h (about 70mph) the simulator says MG1 can be running backwards at 6,500rpm and the engine at 1,150rpm, but in fact the engine can only achieve about 10kW down there, and just to overcome wind resistance requires about 15kW. My guess was that total losses are approaching 20kW; the power curve suggests that Gen 2 would be producing about 25kW at the engine speed that Ken indicated. | |
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10-10-2009, 09:38 AM
| #9 | ||||||||||
| 03 and 10 Prius  Join Date: Nov 2005 Location: Huntsville AL with 2003 Prius
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Friends: 20 | Re: Engine RPM @ 70 MPH Quote:
 Warmer temperatures make the air thinner and reduces aerodynamic drag. You'll notice the 80 mph / 124 kph test at 62F/16C had a significant drop. Bob Wilson Last edited by bwilson4web; 10-10-2009 at 09:44 AM. | ||||||||||
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10-10-2009, 07:01 PM
| #10 | |
| Senior Member Join Date: Jul 2009 Location: Worthington, Ohio
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Friends: 0 | Re: Engine RPM @ 70 MPH Quote:
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| engine, mph, rpm |
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