Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-31-2010, 10:23 AM   #1 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,691

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,269
Thanked 721 Times in 458 Posts
How's your idle? (Just some idle blabbing)

Just wondering about the rpms and fuel consumption of different engines while idling. Share your data, and please give info on the car and it's engine.

My Peugeot 307sw has a 1.6 liter HDi turbodiesel engine with 80kW (110hp). It idles @ 820rpm when rolling and 740rpm when stopped. When warmed up (coolant temp 80°C/176°F) the fuel consumption is 0.60 lph (0.16 gph) while rolling and 0.52 liters (0.14 US gallons) per hour at standstill.

Above data is from my uncalibrated SGII. Outdoor temperature 18°C/64°F. Electric load: LED DRL's (11W total), ventilation fan (speed 2 of 8), CD player.

I've noticed that the per hour consumption can increase by as much as 10% just by pressing the brake - could this be only from the added electrical load of the stop lights (55W total), or is the brake assist adding a load to the vacuum pump on the engine?

__________________
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell


[Old] Piwoslaw's Peugeot 307sw modding thread
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-31-2010, 11:02 AM   #2 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,257

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 286 Times in 199 Posts
2000 Honda Insight 1.0L L3. 0RPM/0gph once warm. 900-1100RPM if you interrupt the auto stop. The ScanGauge says something like 0.11gph at idle, but it is extremely poor at measuring the fuel consumption of my car. But I suppose I should go get an accurate reading of fuel consumption at idle by rolling down the road at 15mph with the engine idling and checking Honda's instantaneous FE readout.

I've seen other cars where pressing the brake raises the idle. I bet it's vacuum related, but you can test by turning on the headlights to create a 110W electrical load.

My last car was a 1996 Subaru 2.2L. 0.24-0.26gph, 800RPM.
  Reply With Quote
Old 03-31-2010, 11:09 AM   #3 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,321

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 611
Thanked 433 Times in 283 Posts
Heh, Robert.

My Civic is about 0.35 gph idling, which it does almost never.
The 3.5 V6 Odyssey is 0.5 gph, or 0.6 with AC on.
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Old 03-31-2010, 11:51 AM   #4 (permalink)
Master EcoModder
 
Join Date: Mar 2009
Location: Northeast Ohio
Posts: 269

The Wife's Hot Rod - '09 Pontiac G8 GT
Last 3: 23.22 mpg (US)

Big Outback - '13 Subaru Outback 2.5i

Little Outback - '02 Subaru Impreza Outback Sport
Thanks: 0
Thanked 16 Times in 16 Posts
My 2002 Mitsubishi Galant 3.0l v6 is .34-.36 gph in neutral, warm per SGII
The Wife's Ht Rd is .5 GPH warm per OE computer. Never checked w/SGII.
  Reply With Quote
Old 03-31-2010, 05:16 PM   #5 (permalink)
Master EcoModder
 
Join Date: Jan 2008
Location: Victoria , Australia.
Posts: 499
Thanks: 20
Thanked 46 Times in 33 Posts
Quote:
Originally Posted by Piwoslaw View Post
Just wondering about the rpms and fuel consumption of different engines while idling. Share your data, and please give info on the car and it's engine.

My Peugeot 307sw has a 1.6 liter HDi turbodiesel engine with 80kW (110hp). It idles @ 820rpm when rolling and 740rpm when stopped. When warmed up (coolant temp 80°C/176°F) the fuel consumption is 0.60 lph (0.16 gph) while rolling and 0.52 liters (0.14 US gallons) per hour at standstill.


I've noticed that the per hour consumption can increase by as much as 10% just by pressing the brake - could this be only from the added electrical load of the stop lights (55W total), or is the brake assist adding a load to the vacuum pump on the engine?
The increased consumption is most likely mostly the vacuum required to be produced not the electrical load.
You could disconnect the brake switch and see if it changes.

The Ford engine 4.0 litre six cylinder non diesel , VVT and variable intake manifold uses a between 1.5 and 2.0 litres at idle (850 rpm) in neutral for the manual variant.
Info from Ford in a release about the then "New" engine (2008 I think) and still in production.

Pete.
  Reply With Quote
Old 03-31-2010, 11:41 PM   #6 (permalink)
Banned
 
Join Date: Feb 2008
Location: maine
Posts: 758

oldscoob - '87 subaru wagon gl/dr
90 day: 47.06 mpg (US)
Thanks: 21
Thanked 18 Times in 14 Posts
darn this question.
I can't even measure fuel mileage.. unless I underestimate, and that is still ok I guess.

if my voltage regulator for the alternator allowed 250 rpm I would let the old sube go there. Very content. I have bogged it to 50rpm waiting for a kick in return...I can only guess they keep it like other cars to be sounding normal, like 500-750, and make the alternator function correctly. Else, I could really set it down..

The consumption is indeed low, I camped all night in one at 0F, (needed idle for heat).. hardly an 8th guage down for 8-10 hours.

1781cc, progressive 2 barrel, 3 main boxer.
  Reply With Quote
Old 04-01-2010, 12:32 AM   #7 (permalink)
Pokémoderator
 
cfg83's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 5,864

1999 Saturn SW2 - '99 Saturn SW2 Wagon
Team Saturn
90 day: 40.49 mpg (US)
Thanks: 439
Thanked 530 Times in 356 Posts
Piwoslaw -

At idle, ~850 RPM = ~1.05 LPH = ~0.28 GPH at standstill.

CarloSW2
__________________

What's your EPA MPG? Go Here and find out!
American Solar Energy Society
  Reply With Quote
Old 04-01-2010, 08:20 AM   #8 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,257

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 286 Times in 199 Posts
0.11gph is pretty darned close to correct. The instantaneous fuel consumption gauge crossed 100mpg while rolling through a parking lot at 10-11mph (0.10-0.11gph).
  Reply With Quote
Old 04-01-2010, 09:09 AM   #9 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,321

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 611
Thanked 433 Times in 283 Posts
I was referring to the 0 rpm 0 gph part.
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Old 04-01-2010, 12:00 PM   #10 (permalink)
EcoModding Apprentice
 
Join Date: Jul 2009
Location: Live in Tucson AZ, work and car now in Detroit
Posts: 200

Protege - '97 Mazda Protege DX
90 day: 46.42 mpg (US)
Thanks: 13
Thanked 23 Times in 18 Posts
1.5L Mazda Protege. 775rpm and 0.19gph. But I think I had my foot on the brake and clutch out in nuetral. I'll try tonight with clutch in, E-brake on and minimum electrical load.

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Honda IACV explained TomO Off-Topic Tech 16 12-21-2015 01:49 AM
High Idle after EOC Devon Hynes Hypermiling / EcoDriver's Ed 3 03-26-2010 10:35 PM
Idle Speed Adjustment '89 Metro SirKeats DIY / How-to 7 02-08-2010 02:23 PM
Consumption at idle groar Instrumentation 12 01-17-2009 07:12 AM
Altered Idle Speed After Performing EOC Tango Charlie Hypermiling / EcoDriver's Ed 20 11-19-2008 12:41 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com