Go Back   EcoModder Forum > EcoModding > Instrumentation > OpenGauge / MPGuino FE computer
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-20-2010, 05:10 PM   #1 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location: ÿ
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 269 Times in 212 Posts
runtime efficiency?

I was thinking about a sort of "efficiency" readout, though I'm not sure it makes sense.

i.e. if you input your vehicle weight/cDA/rolling resistance, then (not accounting for hills/wind) a mpguino type device could conceivably:

make a guess at how much work was done/is being done by looking at the change in speed.

compare it to the fuel that was/is used to do that work in that amount of time

print out the percentage of work that was actually done vs what the fuel could have done in a %100 efficient engine/vehicle.

But given the influence of hills/wind (and even deceleration) I'm not entirely sure how useful it is. Also it is a little misleading to factor in the cda, your engine can be at peak efficiency but still the whole package is a dog.

I do think something like this could be useful where you have no bsfc clue, or other variables (like a slipping torque converter) and are trying to optimize your acceleration curve.

I also considered a simplified scheme where it simply looks at the change in speed vs fuel used, and comes up with a number that doesn't map directly to anything but you can still look for a peak value, and focus on how to get the greatest change in speed (regardless of your cda/weight) for the least fuel when accelerating. Except for the completely synthesized units, I think this might be easiest to implement and offer the most realistic value. But without CDA, your peak will be a speed dependant moving target.

Any of this make sense? Am I missing something obvious?

__________________
WINDMILLS DO NOT WORK THAT WAY!!!

Last edited by dcb; 04-20-2010 at 05:16 PM..
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-20-2010, 05:51 PM   #2 (permalink)
EcoModding Apprentice
 
Join Date: Aug 2009
Location: terra firma
Posts: 138
Thanks: 4
Thanked 24 Times in 22 Posts
i've got a simpler "efficiency" number in mine. Multiply mpg * mph, and you sort of figure out what the ideal value is, and try to keep it as high as possible while driving. It basically tells your economy in terms of gas and time, which to me paints a more complete picture than just gas economy. (Time "is" money, after all). Finding your max FE is neat and all, but not very practical if it means you're stuck at 32mph in 5th gear.

It's not a physics equation like you're suggesting, but i'm just tossing it out there.
  Reply With Quote
Old 04-20-2010, 06:20 PM   #3 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location: ÿ
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 269 Times in 212 Posts
Lol, no thanks FE isn't neat, it is IT.

__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Discussion on tire efficiency Ernie Rogers General Efficiency Discussion 69 12-27-2014 01:17 PM
Announcing a complete solution to mapping engine efficiency kubark42 Instrumentation 80 01-14-2011 09:36 PM
Vehicle Efficiency Improvements SVOboy EcoModder Blog Discussion 24 12-07-2009 10:19 PM
Looking for outstanding efficiency numbers Ernie Rogers General Efficiency Discussion 16 05-10-2009 07:53 PM
Getting more efficiency out of a ZX2. Small list of mods and driving tips for it. koihoshi EcoModding Central 9 07-20-2008 04:26 AM



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