Prius (Gen 3) :: Highway Speed Brake Regeneration Only Works For Speeds Below 50 Mph?
Mar 28, 2014
So i was observing my battery charge indicator, it was 50% charged, and i was going 70 mph and begin to slow down to 20 mph to exit ramp, and at my best of my ability (dont have scan gauge to see if brakes are activating) I tried to use only brake regeneration (using < 1/4 way of the brake pedel) anyways when it was slowing down from 70 mph to 50 mph the battery didn't budge, but as soon as i when from 45 mph to 20 mph battery begin to charge and gained 2 battery bar, and its been consistent though out several tests i did. So my question is does the brake regeneration only works for speeds below 50 mph, and/or is the amount charged to a battery at 70 mph to 50 mph limited until speeds drops below 50 mph.
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2004 Grand Cherokee. I was pulling a heavy trailer 1000 miles, and while coming down a mountain pass 50 miles from the end of the trip the check engine light came on. All other gauges (oil pressure, temperature, etc.) had not changed while climbing or descending and I was in low gear while descending to save the brakes. I drove the rest of the way to the destination without incident. I tried turning the Jeep off and restarting it several times to see if the check engine light would turn off and it stayed on. The next morning the light was off when I restarted it and has not come on again since. I hooked it up to a scan tool and received 2 codes: P0152 and P0132. 2 days later I noticed that it was revving high while idling and in Park. It would rev between 1500 and 2200 RPM while in Park, and at 900 RPM while in Drive. Also, while travelling at freeway speeds it seems like it's trying to downshift for no apparent reason. I hold the throttle still and have even tried cruise control and it intermittently increases engine speed, without changing ground speed. I assumed that I got the transmission too hot while climbing/descending and that the error codes listed above (related to O2 sensors) were associated with that, but now I'm wondering if something more has happened.
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I've got a 2000 Suburban 1500 4WD with the Auto 4WD. I'm running into a vibration at highway speeds along with a clicking sound at idle speed which speeds up and slows down with speed. I've discovered the u-joint on the front drive shaft where it connects with the transfer case is worn and has play in it. Could this cause the vibration?
Also, The front drive train spins any time the vehicle is motion, which is to say the front drive shaft spins as the truck goes down the road, correct?
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I recently switched from stock rotors to a pair of SP slotted rotors. The pads are stock. I thoroughly followed the bedding process and had no problems until now. For the past 2 weeks I noticed brake shudder when stopping from highway speeds. My first reaction was that it was a warped rotor. Since it was a fairly new pair.
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Did use cruise control to maximize battery changing when coasting to a red light or slowing down for a speed zone? Just keep in mind your vehicle will slow down fairly rapidly with no brake lights- so I tend to to do this during those glorious moments when there are no cars behind mine. When you see an approaching red light (with cruise control on) just hold the cruise control switch down and the vehicle will automatically power the generators to max. In this way you will not lose any potential battery charge to the actual brake pads. Be advised also the generators will stop and the cruise will cancel automatically at 22mph which is usually slow enough to avoid engaging the brake pads until you are pretty much stopped. Just thought I would share a neat trick with fellow hypermillers. **Also note this may be a less effective charging method than long drawn out braking but is most effective for rapid slowdown situations like unanticipated red lights, speed zones or expressway off ramps ect. and requires some skill to do safely.
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2010 gen III bought Aug 2009.
Would it be possible to disable HV battery charging or regeneration (with torque pro regen coop)? This way I could use battery and ICE power when going up a long mountainous area, and end up with 30% charge at the top instead of 60%. Then on the way down I could use regen to build back up the battery.
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Bought a 2005 Prius with a perfect history and that recently had its 60k check up at the Toyota dealer. Don't know exactly when the sound changed since I'm not the primary driver, but now it sounds like a jet airplane when it reaches highway speeds and it's hard to hear what we're saying to each other, much less what people are saying over the Bluetooth (although the built in Bluetooth noise cancellation feature is fantastic and the person on the other end of the phone doesn't hear the noisy engine). What could be causing the car to sound like we're taking off at the airport (at any speeds above 40 mph, it seems)? Our passengers comment on the near constant background noise level.
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Having trouble with a shimmy at 65-75mph .....
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My air conditioner is giving me problems. For some reason, when I drive around town taking short trips, my AC refuses to cool the car down. I've also noticed the "outside temperature" gauge displayed in the cluster shows the temperature about 20 degrees hotter than it actually is.
I noticed today while driving on the highway, once I hit 45mph or so, the cool air really started to come through. I've looked at it with a non-Toyota tech after driving around for about an hour, and when we're sitting and idling the low pressure pipe doesn't seem to get cool. After my ride today, I popped the hood when I stopped to check, and it was cool to touch, but not cold as I've felt on other cars.
We also checked the pressure within the system, and it's right on the money (so he says). What could be causing this? I know my AC has never really been as fast as other cars given I keep it in eco mode, but it literally blows warm air until I start going an an accelerated speed.
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It feels like its catching, or its off and then comes back on ?? No codes, none.
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I commute 100 miles a day at higher highway speeds (around 75-85mph, its the flow of traffic around here) for almost my entire commute. I test drove a Prius C the other day and after about 20 miles with cruise set on 80mph, the computer showed 33mpg was the average. So I was hoping for some real world input from currently Prius C owners that commute at higher highway speeds.
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Car suddenly started a high pitched whistling noise/metal on metal sound at highway speeds. It is intermittent, no noticeable pattern w/acceleration or braking. Similar sound at lower volume when the shock/spring is depressed (pushing down on that corner of the car). Louder at low speeds.
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I bought 2012 Prius ii around 6 weeks ago. From day one I started noticing vibrations in the steering wheel most noticeable at highway speeds. I can describe this as high frequency vibrations that become very very annoying especially if you drive to work for an hour every day. This car has OEM Bridgestone Ecopia EP 20 tires. I took the car to the dealership twice already, they balanced the tires twice and road force tested it twice. They replaced front tires for me because based on the test results one tire was at 16 lb the other one at 19 lbs.
The new tires are at 8 and 10. They keep on telling me that this is by design and is a characteristic of the vehicle. However the Prius I test drove when I was buying it did not have this problem, otherwise I would never buy it. This vibration happens in any mode and I can even feel it at lower speed now though it is not as noticeable. I had a few people including Prius owners drive my car and everyone feels the vibration. With so many Prius models sold I highly doubt that everyone just accepts it as a feature.
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The temperature has dropped down into the 30s here and in my 2011 Gen 3 Prius, when I am driving at highway speeds (55mph-75mph), and go over any sort of light bump or rough road (gently rough, nothing significant just normal "imperfect" highway bumps), there is a rattling sound coming from the front of the dashboard where it meets the windshield that can only be described as the same sound that your hand makes when it's rubbing a balloon! Not your normal plastic random rattle, but like "rubbing a balloon with your hand quickly" sound.
I don't mind that other plastic random rattles from time to time (I am not OCD about the imperfections of how much plastic is in the car), but this is obnoxious and I feel like I'm literally driving a clown car. Is there some sort of lubricant or adhesive that is between where the dashboard and windshield meet that has possibly dried out, that the dealership could quickly fix or apply? I'll still under full warranty at 22k miles.
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I have a 2001 w/94k. New tires and alignment (3k). Recently I have been hearing a humming noise which can start to be heard around 45mph which gets increasingly loud up to 65mph, and then seems to quiet down if I go above 70mph. From the driver's seat it sounds like it's coming from the driver's side rear of the car and from the passenger seat it sounds like it's coming from the passenger side rear of the car. So it definitely sounds like it's coming from the rear of the car. Bringing my car in to get looked at it is difficult with my work schedule, so I thought I would try here first. Around the city there is no noticeable sound and there has been no loss in MPG that I can tell (44-47).
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I just got my new 2013 Persona Prius on Saturday. I haven't put too many miles on it (under 200) but I'm noticed that a feel a stuttering or hesitation when I reach highway speeds. Typically about 65 -70mph. I can't think of a better way to describe this but it feels like the when driving a manual transmission, when you need to shift to the high gear? That kind of stuttering feeling. I'm sure that it's not the same problem but it feels like that. Once I go faster, the feeling stops. Or slower. But going between 65 to 70, it's the same feeling.
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I've noticed that at speeds of 60+ (especially 65+), the Prius control doesn't seem "tight." I wouldn't go as far as saying it has a "shimmy" but it's harder to keep straight on the highway. I absolutely adore my Prius but this bothers me. I had the alignment checked and it's perfect. I know all small cars tend to be less grounded than, say, an SUV, but I'm still curious if this is normal before I take it into the dealer.
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Purchased one owner Prius from Honda dealer May 2014 with 92000 miles.Now 2 months later 94000. Both service departments of Honda and a Toyota dealer said my car handles normally for a Prius.The car dips from left to right while driving at slow and highway speeds. It feels like a boat moving through water. The suspension was said to be good.Driving it feels unstable, like a Montero Sport or a stage coach. I wanted to do a lot of driving this summer, but this feels so uncomfortable.
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I'm talking basically about the equivalent of your standard pulse and glide in the regular Prius. But the PiP would allow you to do it up to 62 mph. However, you would manually have to toggle the HV/EV button to do it. It would be tiresome.
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What are the most and least optimal times to use cruise control at highway speeds?
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When I am driving, especially at high speeds on the highway, the Navigation System on my Prius runs pretty slow. As the GPS icon is traveling, the movement is very choppy. It is not a smooth transition. Is there any way that I can fix this?
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