Dean_W
Member
Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline
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We know that people change parts to release more power.
But, can you change parts to make it more economic? I don't mean what you could do on a manufacturing scale, but what you could do in your garage.
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myke
Member
Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
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Thinner tyres, more tyre pressure.
smaller mirrors
blanked grille
look at the polo bluemotion (or is it bluefin ? )
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myke
Member
Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
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http://www.autoexpress.co.uk/carreviews/firstdrives/206519/volkswagen_polo.html
70mpg
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DaveB
Member
Registered: 29th Dec 00
Location: Huddersfield
User status: Offline
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strip it out; less weight= more economy
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Matt L
Member
Registered: 17th Apr 06
User status: Offline
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[unserious answer] ecotec valve, big ass induction kit, that vortex thing that supposedly spins the air as it goes into the engine (find all the usful mods on t'ebay) [/unserious answer]
serious answer just drive as smoothly as possible, make sure the car is well serviced, use as little electrical power + air con etc.
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myke
Member
Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
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reduce drag.
please don't do this though 
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Dean_W
Member
Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline
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quote:
Originally posted by myke
reduce drag.
please don't do this though
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deano87
Member
Registered: 21st Oct 06
Location: Bedfordshire Drives: Ford Fiesta
User status: Offline
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Make sure everything is as it should.
Well serviced, correct tyre pressure, not too hard not too soft, no roof rack or bars, wind deflectors probably help. You can get petrol saver tyres too.
The main thing is don't drive it hard etc. i.e. with the 12v, it will sit at 80mph, but not that nicely. It will sit at 70mph again. But it's still revving the nuts off it. I sit at 60mph most of the time. Good fuel economy, and I don't get stressed out going to work, because I'm not racing to get there with cars slowing me down in the fast lane etc.
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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we do a LOT of these:
http://www.econotune.com/
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Dean_W
Member
Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline
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 Didnt' even know an economic re-map existed Dave
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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We map economy points into most road cars we map, only at low throttle sites in 4th/5th gear at whatever Rpm 30, 50 AND 70-80MPH (or whatever suits the customers driving) so long runs onb motorways, dual carriage ways and round town mean a decent saving in fuel over standard. But if you drive it hard everywhere then you wont see any gain in MPG.
I mapped an economy point into my ecu on the way back from PVS @ whatever RPM 75 mph was in 5th (3850 I think). on the way there I got 29 mpg and I got about 45 mpg on the way back after altering a few of the fuelling sites
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Dean_W
Member
Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline
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Thats a clever thing to do. Hows that accomplished then? Worked into a certain rev band or something?
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myke
Member
Registered: 7th Feb 01
Location: High Wycombe, Buckinghamshire
User status: Offline
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looks pretty interesting, but how old is the site:
quote:
If we take an average motorist these days doing 25,000 miles per annum in their Turbo Diesel. If we take it that a litre of diesel is costing around 89p and the car is kept for two years we can predict savings as follows.
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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this pic is a typical fuel map:
the numbers relate to the injector pulse duration (how long the injector is open each time it fires)
on the bottom is the engine RPM and on the vertical line is the engine load (throttle position in this case)
by working out your throttle position and RPM's at a paticular speed using the dyno you can identify the typical load sites that would be used under varying driving speeds, can even simulate slight inclines (hills) in the road. Usually throttle position under cruising speeds is between 6% and 20% so you can accurately map in some economy at any given throttle or RPM amount. the top 5 lines of data are rarley mapped for anything except power.
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