![]() | #76 | |
BHPian ![]() Join Date: Jun 2008 Location: Navi MUMBAI
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I go by 5000 km interval change ( or even less at times ) FOR MY INDIGO turbo LS.I manage 5000 km run in 3-1/2 months. I have used the CRB turbo too. Looking at your mileage , should i too stick for the 7500 k m company recommended interval. I almost always exceed the cf4 , so may i stick to 7500 km ? Because the oil seems to have not lost too much of its lubricity by then ( 5000k m). And i stick to 5000 km for my petrol accent too with 60000km on the odo than the company specified 10000km / 6 months Now that the oil is become so expensive , i feel i ought to. Last edited by HIGHNOON : 11th January 2010 at 21:07. | |
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![]() | #77 |
Senior - BHPian ![]() Join Date: Nov 2009 Location: Germany
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| ![]() as far as i know the modern turbos RPM ranges from 40000 rpm to 170000 rpm when in full swing, now imagine something rotating at such high speed being suddenly switched off, this would lead to huge thermal shock loads in and near the turbo housing, hence in order to minimize this tendency it is advisable to idle the engine and then gradually shut it off, gurus please correct me if i am wrong. |
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![]() | #78 |
BHPian ![]() | ![]() I did ask the salesman who explained the features to me about the idling requirement. He just brushed it aside saying that modern diesels don't need this done. However, he told me to pump the cluthc 3-4 times before ignition everyday. The micro hybrid (start stop) mechanism does not allow you to idle for long. So the only options I have is to turn off the start/stop feature and/or use the methods explained above. |
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![]() | #79 | ||
Team-BHP Support ![]() ![]() | ![]() Quote:
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I guess you can switch the micro hybrid system off? I do remember a control for this. Thus, when idling, use that switch! | ||
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![]() | #80 | |
Senior - BHPian Join Date: Jul 2008 Location: Bangalore
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Why on earth Clutch should be pumped 4-5 times apart from exercising calf muscles ? never heard about it can Gurus throw some light. | |
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![]() | #81 |
BHPian ![]() | ![]() In a rented Audi A4 in Germany, I saw that they have an oil reservoir fed by the oil pump, which lubricates the turbo. It looked a bit like a shock absorber tube. When the engine starts, the oil is forced into this tube by pressure and a piston is pushed out so the tube is filled. When you switch off, the reducing oi pressure transfers the oil back into the sump from this tube, thereby lubricating the turbo on the way out even when the engine is off. I estimate the capacity of this reservoir to be about 500ml to 700 ml. Has anyone seen something like this ? |
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![]() | #82 | |
BHPian ![]() Join Date: Feb 2005 Location: Chennai
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That's is the reason for the recommendation to idle the engine for a minute, by which time the turbo stops spinning or atleast is spinning very slowly, and does not get damaged. | |
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![]() | #83 |
BHPian ![]() | ![]() I saw a caution notice in a BEST bus today, stating that the bus has to be idled for 3 minutes before switching off the engine. It was in marathi. It also mentioned that because the turbocharger was spinning at a very high RPM, it needed to be idled so that the lubrication is not cut off suddenly. quite cool.... the bus driver was looking at me funily while I was reading the notice... then i told him that altleast he had a turbo, my car doesn't ![]() |
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![]() | #84 |
BHPian ![]() | ![]() Toyota Fortuner manual clearly states that you have to idle for about a minute after spirited driving. So no harm in doing so. It also states to depress the clutch fully before starting the engine Cheers Dilip |
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![]() | #85 |
BHPian ![]() Join Date: Jul 2009 Location: Bangalore
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| ![]() Spare me if this has been raised before or my ![]() The mahindra scorpio hybrid manual states that at the signal, after 13 secs of idling the engine shuts off and the moment we press the clutch it comes off live again. Doesn't that hurt the turbo? |
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![]() | #86 |
BHPian ![]() Join Date: Oct 2010 Location: Pune/Lasham
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| ![]() The Scorpio manual is pretty specific about idling it for a minute on each start up and shut down to spool up and cool down the turbo-charger. I have seen no such recommendation in the Yeti manual. Although at one place (buried deep within the pages) it does mention that after a hard long drive, it is recommended that it be idled for a minute before shutting down. Does it mean one can drive straight off, albeit gently - particularly off a cold start. What would hard long drive mean for the Yeti? When should one idle the engine for a minute? Also if one was to drive the last five minutes gently - at RPM around 1000 - 1200 would one still need to idle? Or could one just turn off the engine? I'd be interested to hear from the Skoda owners what do they do for their turbo-charged cars. They all appear to be similarly equipped. |
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![]() | #87 |
Senior - BHPian ![]() Join Date: Feb 2010 Location: Not fixed.
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| ![]() -The logic is when your oil temperature is high, oil pressure is low. Turning off engine in such a state means during next startup you will have oil starvation. -Also after it is switched off, it cools very rapidly. Result? Thermal shock. This is more prevalent where oil temp. is high. And that is the Tubo. So the main motive is to bring the oil temp. down. |
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![]() | #88 | |
Distinguished - BHPian ![]() ![]() Join Date: Oct 2009 Location: Bathery/BLR
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| ![]() I guess this is a very apt explanation. Quote:
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![]() | #89 |
BHPian ![]() Join Date: Jun 2011 Location: Bangalore
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| ![]() Do the new Lauras have the second generation, water-cooled turbos? It's a real pain sometimes to have to wait for a minute! |
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![]() | #90 |
BHPian ![]() Join Date: Oct 2010 Location: Pune/Lasham
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| ![]() Thanks for the detailed explanation about why there are different post-start and pre-stop idling recommendations for different vehicles. From the forgoing I assume that Scorpio had first generation turbo - only oil cooled - while the Yeti and more modern machines have later generation which is cooled by both oil + water. The Yeti manual then makes sense in my mind. |
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