Go Back   EcoModder Forum > EcoModding > Hypermiling / EcoDriver's Ed
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-30-2012, 05:04 PM   #1 (permalink)
Master EcoModder
 
Join Date: Nov 2010
Location: Atlanta
Posts: 403

Sweetie - '11 Hyundai Sonata GLS
90 day: 39.35 mpg (US)

My Miles - '03 Combo GLS/KLX/Ninja
90 day: 40.49 mpg (US)

Sipper' - '04 Kawasaki Ninja 250
90 day: 74.98 mpg (US)
Thanks: 1
Thanked 37 Times in 28 Posts
Acceleration load

I have seen it posted many times that the 70-80% range is most often used, but I have a question. My UG classic only showed load, while the EM model shows load, and absolute load and they are very different.

So, do I accelerate with 80% load, or 80% absolute load?

__________________
This ain't a war, anymore than a war between men and maggots. Or, dragons and wolves. Or, men riding dragons, throwing wolves at maggots!
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-30-2012, 05:18 PM   #2 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,121

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,438
Thanked 2,489 Times in 1,501 Posts
80% load. Its not possible to accelerate at 80% abolute load at low rpms since you don't have anywhere near 80% of the maximum power available.
__________________
Current project: A better alternator delete
  Reply With Quote
Old 04-30-2012, 05:58 PM   #3 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,018 Times in 1,302 Posts
About 1-2 inches of manifold vacuum should be close to your 80% load, regardless of the engines RPM as long as it is above about 1000. As I understand it 80% load should be possible at any RPM from just above idle speed to redline.

regards
Mech
  Reply With Quote
Old 04-30-2012, 08:18 PM   #4 (permalink)
Master EcoModder
 
Join Date: Nov 2010
Location: Atlanta
Posts: 403

Sweetie - '11 Hyundai Sonata GLS
90 day: 39.35 mpg (US)

My Miles - '03 Combo GLS/KLX/Ninja
90 day: 40.49 mpg (US)

Sipper' - '04 Kawasaki Ninja 250
90 day: 74.98 mpg (US)
Thanks: 1
Thanked 37 Times in 28 Posts
Quote:
Originally Posted by Daox View Post
80% load. Its not possible to accelerate at 80% abolute load at low rpms since you don't have anywhere near 80% of the maximum power available.
With the (load) at 80, the absolute load is at 55 or so.

Will play more with it and see, but 80% absolute load is MUCH more acceleration!
__________________
This ain't a war, anymore than a war between men and maggots. Or, dragons and wolves. Or, men riding dragons, throwing wolves at maggots!
  Reply With Quote
Old 04-30-2012, 11:38 PM   #5 (permalink)
Master EcoModder
 
mwebb's Avatar
 
Join Date: Jul 2009
Location: New York
Posts: 510

no nickname , it's just a car - '04 volkswagen golf tdi
Thanks: 2
Thanked 101 Times in 74 Posts
Ford Paul Baltusis

there is a very good explanation from a Ford engineer regarding the use of absolute load

in IATN it may be available elsewhere on the net

the bottom line is
do not use absolute load for testing as the upper limit will always be 100%
even if the system is under performing by a huge amount

many / all systems (un boosted) can never get to 100% load even under optimum conditions , it is normal to see peak load values between 90 and 95% under WOT in 2nd at 4k rpm
a system with restriction to flow will report much less , it is how we determine
(when combined with fuel trim values)
when systems have restriction to flow or fuel delivery problems or under reporting MAF sensors



Load in green peaks at 80% , real time fuel trim in red is heavy ADD over 15% at WOT
new MAF sensor is UNder reporting

NEW means
Never
Ever
Worked
  Reply With Quote
The Following User Says Thank You to mwebb For This Useful Post:
user removed (05-01-2012)
Old 05-01-2012, 09:41 AM   #6 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,018 Times in 1,302 Posts
80% load means the engine is producing 80% of the potential 100% which is maximum load in an engine in perfect operating condition. If atmospheric pressure is 30 inches of mercury, then the calculated 80% load would be 30X80% or 24 inches. A vacuum gauge would read 6 inches of manifold vacuum.
I think in reality it is closer to 2-3 inches depending on the engine and the RPM at which you are applying the load.
Take any engine, put it on a dyno and pick any RPM. Increase the load until you have 2-3 inches of manifold vacuum measured and you would be near 80% load, regardless of the RPM. 100% would be the maximum power that engine could produce and that specific RPM reading.
You also have to choose whether you are measuring horsepower or torque which would be at different RPM for the maximum the engine is capable of producing. Peak torque is efficient, while peak horsepower is not generally nearly as efficient.

regards
Mech
  Reply With Quote
Old 05-04-2012, 09:22 AM   #7 (permalink)
Master EcoModder
 
Join Date: Feb 2009
Location: France - Paris
Posts: 762

la_voiture_de_courses - '03 Renault Megane Estate
OldContinents
90 day: 44.34 mpg (US)

xiao lan - '01 Audi A2
90 day: 38.88 mpg (US)

Brit iron - '92 Mini Mini
90 day: 45.5 mpg (US)

Prius - '09 Toyota PRIUS Lounge
90 day: 47.37 mpg (US)

Beemer - '06 BMW F800 ST
90 day: 53.06 mpg (US)
Thanks: 188
Thanked 33 Times in 30 Posts
No straight relation with the throttle position then ?

(i was thinking of marking my throttle with a dot at 75% opening, maybe not a good idea then)

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com