Sweet spot @1600rpm - Civinfo
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post #1 of 7 (permalink) Old 20th December 2018, 20:40 Thread Starter
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Sweet spot @1600rpm

Just back from a few days away. 300+ miles out then 300+ miles back. Outward trip was during the early hours on a cold day pushing her in order to try and miss the morning traffic. Two dash cams plugged in along with phone, also with A/C on. Diverted off M6 at Stoke for a scenic trip to Stafford and back onto M6 for M6 toll, M42 and M5. Over some big hills in Devon she returned 61.86 MPG. (Tanked at beginning of return trip)
On the return (9p a litre cheaper diesel in Devon than home) I decided no rush so let's see what I can get. So settled down in sixth with 1600rpm giving 58 mph. Pootle pootle. Occasionally pushed up to overtake, plus heavy stop start traffic near Birmingham and some 70 running on toll when bladder started singing please release me. Computer got into low 80's with 82.6 showing when filled up at home. Manual calc gave me

I'm certain I could of got 80+ for real without delays or faster running. I'm now convinced that 1600 in sixth is the best for high mpg.


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post #2 of 7 (permalink) Old 21st December 2018, 06:44
 
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For high mpg yes, but for clutch and strain for engine - isnt. Also DPF gets more ash.
You will save on fuel, but when burning the DPF will start, more fuel will take.

Like numbers on dash or longer engine life and clutch?

Its up to you.
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post #3 of 7 (permalink) Old 21st December 2018, 10:11
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What app you using? Could do with a manual calculation to see how I fair against the computer in the motor

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post #4 of 7 (permalink) Old 21st December 2018, 10:33
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Quote:
Originally Posted by zdziseq View Post
For high mpg yes, but for clutch and strain for engine - isnt. Also DPF gets more ash.
You will save on fuel, but when burning the DPF will start, more fuel will take.

Like numbers on dash or longer engine life and clutch?

Its up to you.
If you're loading (labouring) up the engine, your throttle input will be more which will be more stressful and reduced mpg, no good for the clutch and flywheel.

Increased mpg will need less throttle input, less loading on the engine and the lowest revs possible which will be kinder on the clutch and flywheel.

You can still have excellent mpg and not negatively impact on the clutch and flywheel.
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post #5 of 7 (permalink) Old 21st December 2018, 11:00 Thread Starter
I Hate tailgaters!
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What app you using? Could do with a manual calculation to see how I fair against the computer in the motor

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It's a app called Road Trip. Used it for years. Which phone do you have, I have a iPhone and I'm not sure if it's available on android. There is a free version to try with restrictions. This is old reds after over five years.


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post #6 of 7 (permalink) Old 21st December 2018, 11:13 Thread Starter
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No labouring took place. She felt quite happy at 1600 rpm in sixth. Any hills and cruise control was pushed up to increase revs until back on flat. I know how DPF's work and on other trips I've purposely dropped a gear and cruised with 2000+ rpm for over 20 minutes to force a regen. But on this trip knowing she'd done one herself I decided to experiment. And again it wasn't continuous for 300 miles, in heavy traffic and Birmingham and on the toll road (my bladder controlling the revs) the cruise control was off and revs nearer 2000 unless stood in traffic.
Out of interest what rpm does everyone think to be absolutely minimum for mpg & flywheel health.


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post #7 of 7 (permalink) Old 21st December 2018, 12:02
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rpm/dmf

Quote:
Originally Posted by hondacivicnut View Post
If you're loading (labouring) up the engine, your throttle input will be more which will be more stressful and reduced mpg, no good for the clutch and flywheel.

Increased mpg will need less throttle input, less loading on the engine and the lowest revs possible which will be kinder on the clutch and flywheel.

You can still have excellent mpg and not negatively impact on the clutch and flywheel.
Quote:
Originally Posted by Red Dwarf View Post
No labouring took place. She felt quite happy at 1600 rpm in sixth. Any hills and cruise control was pushed up to increase revs until back on flat. I know how DPF's work and on other trips I've purposely dropped a gear and cruised with 2000+ rpm for over 20 minutes to force a regen. But on this trip knowing she'd done one herself I decided to experiment. And again it wasn't continuous for 300 miles, in heavy traffic and Birmingham and on the toll road (my bladder controlling the revs) the cruise control was off and revs nearer 2000 unless stood in traffic.
Out of interest what rpm does everyone think to be absolutely minimum for mpg & flywheel health.




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Think the answer to [email protected]&flywheel health is as above. meaning engine loading.

True to say though (high loading/high throttle at higher rpm figures (say above1800rpm?) will be less significant on any possible negative impact on the flwheel.
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