EcoModder Forum Pulse and glide test results: VW Up!

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 07-23-2014, 05:01 PM #1 (permalink) EcoModding Lurker   Join Date: Jul 2014 Location: Denmark Posts: 4 VW Up! - '14 VW Up! 90 day: 50.14 mpg (US) Thanks: 1 Thanked 1 Time in 1 Post Pulse and glide test results: VW Up! Hello fellow ecodrivers I tested P&G, in my stock VW Up! (1,0 liters gasoline, 60 BHP), versus driving with constant speed. The average speed of all runs was 50 km/h (30 MPH). Since my car is stock, the glides was performed with engine idling. The pulses was from 24 MPH -> 36 MPH. The test course was 2,2 miles of smooth tarmac, without elevation and lights, no traffic interfering and a few 30MPH bumps. Engine warm, calm and dry weather and temperatur around 20 *C. I havent bought a Scanguage yet, so the test was performed with the factory installed trip computer, which is shows a fuel consumption approx 5% lower than reality. This is the measurement from my 4 runs: 1 out: Constant speed: 2,70 l/100km (87,1 MPG (us)) 2 back: Pulse and glide: 2,80 l/100km (84,0 MPG (us)) 3 out: Pulse and glide: 2,80 l/100km 4 back: Constant speed: 2,70 l/100km Afterwards I wanted to calculate potential fuel saving, if I was able to turn the engine off. By observing pulse and glide times and consumption, during the tests, I calculated theoretical P&G fuel consumptions with engine idling and engine off during the glides. Calculated fuel consumption with P&G with engine idling: 2,89 l/100km Calculated fuel consumption with P&G with engine off: 2,11 l/100km The result: P&G in the test showed an increased fuel consumption 3-4% compared to driving with constant speed. If I was able to turn off the engine of during P&G, I would certainly get lower fuel consumption. From my guesstimations it would result in a 20-30 % decrease in fuel consumption compared to constant speed. Last edited by Retardosaurus; 07-23-2014 at 05:42 PM..
 The Following User Says Thank You to Retardosaurus For This Useful Post: MetroMPG (07-25-2014)
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 07-23-2014, 08:29 PM #2 (permalink) Master EcoModder     Join Date: May 2009 Location: Australia Posts: 1,470 UFI - '12 Fiat 500 Twinair Team Turbocharged! 90 day: 40.3 mpg (US) Jeep - '05 Jeep Wrangler Renegade 90 day: 18.09 mpg (US) R32 - '89 Nissan Skyline STiG - '16 Renault Trafic 140dCi Energy 90 day: 31.31 mpg (US) Prius - '05 Toyota Prius Team Toyota 90 day: 50.25 mpg (US) Premodded - '49 Ford Freighter 90 day: 13.48 mpg (US) F-117 - '10 Proton Arena GLSi PickupsMitsubishi 90 day: 37.82 mpg (US) Ralica - '85 Toyota Celica ST 90 day: 25.23 mpg (US) Thanks: 316 Thanked 433 Times in 307 Posts Thanks for the results. Bare in mind that instrumentation's accuracy (factory or SG), will vary depending on how the car is driven. On my Fiat the factory display is about 2% optimistic for most drivers, but for us Eco types it's actually about 2% pessimistic. Same goes for SG, it's only accurate once you calibrate it to your driving style, change style and the calibration goes out. It can make you think you're saving fuel with a new technique until you fill up and realise it was just a way of fooling the instruments. I've found that engine on P&G just doesn't work on the Fiat's little 2cyl engine (too light and poor aero), can't really do EOC because it's a turbo. It's the car that can't be hypermilled. __________________
 07-25-2014, 09:35 PM #3 (permalink) Batman Junior     Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 21,575 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 52.8 mpg (US) Winter beater Metro - '00 Chevrolet Metro 90 day: 61.98 mpg (US) Fancy Metro - '14 Mitsubishi Mirage top spec 90 day: 58.72 mpg (US) Even Fancier Metro - '14 Mitsubishi Mirage top spec 90 day: 66.29 mpg (US) Thanks: 3,355 Thanked 6,152 Times in 3,187 Posts What is it about your Up that prevents you from stopping the engine? __________________ Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress... Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget
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Quote:
 Originally Posted by MetroMPG What is it about your Up that prevents you from stopping the engine?
I dont wanna mod my new car with a kill switch, since its brand new and its everyday car. And I dont like turning the ignition off and risking locking the steering wheel.

 07-30-2014, 10:49 AM #5 (permalink) Batman Junior     Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 21,575 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 52.8 mpg (US) Winter beater Metro - '00 Chevrolet Metro 90 day: 61.98 mpg (US) Fancy Metro - '14 Mitsubishi Mirage top spec 90 day: 58.72 mpg (US) Even Fancier Metro - '14 Mitsubishi Mirage top spec 90 day: 66.29 mpg (US) Thanks: 3,355 Thanked 6,152 Times in 3,187 Posts Fair enough. __________________ Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress... Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget
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Quote:
 Originally Posted by Retardosaurus I dont wanna mod my new car with a kill switch, since its brand new and its everyday car. And I dont like turning the ignition off and risking locking the steering wheel.
Kind of a shame because in my Fiat with EPAS, the EPAS continues to work in EOC. In fact it does the opposite of what most cars would do and goes into parking mode which makes the steering extemely light. I don't really EOC out of sympathy for the turbo though.

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