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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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set engine tickover speed to 900rpm on a D5Views : 441 Replies : 9Users Viewing This Thread : |
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Feb 14th, 2019, 20:41 | #1 |
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set engine tickover speed to 900rpm on a D5
Hi if I set the engine tickover speed to 900rpm on a D5 (std is 700rpm) will it use much more fuel ?
Dave |
Feb 14th, 2019, 21:43 | #2 |
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If you can find fuel flow data in the technical specs in Vida, you could then monitor fuel pressure data at the 2 different engine speeds to make a calculation or I guess you make a Diesel Purge style fuel loop in the engine bay and run half a litre of diesel through at the 2 different rpm.
Time the results then extrapolate the findings. I suppose the more obvious questions are why do you want a higher idle and how can you achieve it?
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2002 S60 SE D5 Manual 209000 miles |
Feb 14th, 2019, 22:04 | #3 |
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Hi Simon
I have fitted a top engine mount polybush and as you know they can give some bad vibration, but if I hold the revs at 900-1000rpm the vibration is nearly gone, I do like the way the car feels with the top polybush , I will be re-programing the ecu to take the rpm to 900 from 700, Dave |
Feb 14th, 2019, 22:33 | #4 |
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An interesting little project Dave.
I can't see how any increase in fuel consumption would be high enough to cause an issue in fact I bet it's pretty negligible.
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2002 S60 SE D5 Manual 209000 miles |
Feb 14th, 2019, 22:38 | #5 |
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In theory, if it's only a matter of idling mixture, I don't think it would make an important difference, maybe 1-3% more fuel burning. But I wonder if it won't also affect the way the computers measures the fuel mixture for the entire rpm range.
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Feb 14th, 2019, 22:40 | #6 |
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Hi Simon
I did think I would not notice using any more fuel, I will try doing it soon as I have cloned some ecu,s so I can have a play I will post when I have done tried it out, Dave |
Feb 14th, 2019, 22:53 | #7 | |
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Quote:
Dave |
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Feb 15th, 2019, 08:39 | #8 |
S60 D5244T4
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Is the car an Auto? I like the way both my Volvos move along at 700 RPM in idle speed in traffic. Would setting the RPM to 900 make this a wee to fast? saves on the breaking?
Just something to bear in mind. |
Feb 15th, 2019, 08:52 | #9 |
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Hi no it is not a auto,
Dave |
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