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09-06-2010, 03:27 AM | #1 |
Drives: yaris1.33 Join Date: Jul 2010
Location: slovakia
Posts: 425
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driving on Low RPM
is driving on rpm lower than 2000 hurting the engine or damaging something ?
I have 6 speed manual trans. thanks |
09-06-2010, 04:34 AM | #2 |
Drives: Yaris Join Date: Sep 2010
Location: Outside of it
Posts: 28
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I'd like to know as well. With my focus, I could happily move along at 1500RPM ish or lower, but my Yaris feels like it's struggling. I could also change gear at 2000RPM on the Focus, but the Yaris feels unhappy unless I hit 3000RPM.
I should try harder as I'm not going to save on petrol if I always have to rev higher :( |
09-06-2010, 07:16 AM | #3 |
Drives: yaris1.33 Join Date: Jul 2010
Location: slovakia
Posts: 425
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I was accustomed to do the same but have read somewhere that it is not good for Yaris engine
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09-06-2010, 01:21 PM | #4 |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
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No, it won't hurt a thing.
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09-07-2010, 12:19 PM | #5 |
Only Happy When it Rains
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+ a bajillion. It will take time getting use to the Yaris, especially coming from a high torque car, but the Yaris runs fine in the low rpm ranges. I shift at 2000 rpm's and try not to ever go higher, and my car runs fine.
__________________
Colin Chapman disciple |
09-06-2010, 03:19 PM | #6 |
Drives: yaris1.33 Join Date: Jul 2010
Location: slovakia
Posts: 425
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glad to hear that thanks hilton
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09-07-2010, 04:13 AM | #7 |
Drives: 2009 Yaris 1.5 M/T 5dr. Join Date: Jul 2009
Location: Philippines
Posts: 8
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What's important is it does not lug, you know the engine vibrates due to lack of power on a given gear... If it does not lug then you're fine...
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09-07-2010, 05:11 AM | #8 |
Drives: yaris1.33 Join Date: Jul 2010
Location: slovakia
Posts: 425
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no the engine is able to run at 1500 rpm very smoothly and have enough power to accelerate without shifting down so it should be ok ;)
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09-08-2010, 01:12 AM | #9 |
Drives: 07 Yaris sedan Join Date: Jun 2007
Location: Keremeos BC
Posts: 986
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4-holers don't like to lug, and what is lugging is unique to every engine. I never push my Yaris below 2 grand, and it cruises fine at 1500. RPM isn't that big a problem for fuel economy, it is throttle opening that hurts...
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09-08-2010, 03:27 AM | #10 |
Drives: Yaris Join Date: Sep 2010
Location: Outside of it
Posts: 28
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I can confirm that my Yaris coasts fine at 1500RPM (in fact isn't it when the eco thingy that cuts off the petrol to save it goes off?) and I can change speeds at 2000RPM alright. It's just that coming from a 1.6L petrol car, the Yaris lacks serious punch when doing so. But I guess I can't have both that and high MPG! :D
Mind you, I leave in town, so I don't really ever need to floor it! Can't go much faster than the car in front of me, can I? |
09-08-2010, 03:50 AM | #11 |
Drives: yaris1.33 Join Date: Jul 2010
Location: slovakia
Posts: 425
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Tlyttle : how do you know when the throttle is opening ?
PIngouin : the same situation I am living in the city and when you have car in front it is hard to floor it down :D usually I am cruising at 50-60 km/h :) |
09-08-2010, 09:51 AM | #12 |
Drives: 2007 Yaris Hatchback Join Date: Jan 2010
Location: Central Florida
Posts: 254
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Throttle is open when gas pedal is pushed. Not a mechanic here but I dont think fuel injection has a throttle. It's all electronic right?
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09-08-2010, 10:54 AM | #13 |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
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If you don't hear knocking and the car doesn't shudder, you're not "lugging" an engine.
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09-08-2010, 01:53 PM | #14 |
Drives: '09 Yaris carmine red 2d HB Join Date: Jun 2009
Location: Middletown, NY
Posts: 1,501
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A little common sense can go a long way. How low you should go on the RPMs is dependant on the gear and if you are going uphill etc.
Understanding this is part of driving. One can get a feel if you are "luging" an enging and then, shift acordingly. Lugging an engine can put more stress on the wrist pins, con rod bearings etc. It just simple, basic physics that it does. I'm not going to debate any one who says it doesn't. The only thing that is debatable is at what point you are indeed lugging the engine and that point can only be determind by the imediate driving conditions, not by some sort of chart or table etc. |
09-08-2010, 02:10 PM | #15 |
Drives: 2008 Polar White LB Auto Join Date: Oct 2008
Location: Metro Detroit
Posts: 1,238
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You'll know your lugging the vehicle just as Hilton stated, you'll have next to no power/pull, car will be shuddering and feel like it's gagging to stay alive. As long as the car is running and pullin smooth, your smooth sailin
__________________
I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important. |
09-08-2010, 02:19 PM | #16 | |
Drives: '09 Yaris carmine red 2d HB Join Date: Jun 2009
Location: Middletown, NY
Posts: 1,501
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Quote:
The issue is subjecting the wrist pins, con rod bearings etc, to extra stress. Like I said, it's simple, elementry physics. |
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09-08-2010, 06:12 PM | #17 | |
Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
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Quote:
The other thing that most people have forgotten about now is that crankshafts have torsional vibrations with resonant frequencies. A couple of generations ago, it was common for inline 6 and 8 cylinder engines, with their very long, slender crankshafts often supported only by 3 main bearings, to have "critical speeds" in the low operating speed range. There was a fundamental torsional resonant frequency that could be excited by the power pulsations of the engine at a certain, usually rather low speed. Pushing the engine hard at that speed would cause rapidly increasing vibrations that could quickly result in a broken crankshaft. Sometimes there were similar resonant torsional vibrations in driveshafts, and either could cause the violent shuddering of the car I mentioned. Engineers tried to keep the critical speeds below where most people would drive and drivers were warned not to lug the engine. Modern engines have much stiffer crankshafts, better main bearing support, often are equipped with harmonic balancers to damp crankshaft vibrations, and typically don't have critical speeds in their operating range. It's of historical interest only, but the old warnings about damage from "lugging" go on like people still slow down on the highway to see what the problem was hours after the wreck has been cleared away. |
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09-08-2010, 02:21 PM | #18 |
Drives: 2008 Polar White LB Auto Join Date: Oct 2008
Location: Metro Detroit
Posts: 1,238
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Modern ecu or not, a car on the verge of stalling due to being lugged is going to happen regardless. So if what your saying is true, then your car would be running smooth at 200 rpms while it's choking to death going down the road. I don't see that happening.
__________________
I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important. |
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