Fossicker
I have a 04 TD5 auto and was wondering if there is a way to lower the ratio in top gear by about 500 rpm to improve fuel economy for highway driving. Cheers
Master
Are you trying to lower the gears, and raise the RPM or are you trying to lower the RPM?
You could get 1.003 gears put in the high range of the transfer case to lower the RPM on the highway...
or you could get 1.410 gears in the high range to raise the RPM.
See: Ashcroft Transmissions
Fossicker
Trying to lower the rpm in top gear. Currently top gear sit at about 2500rpm at 110kph. I want to get that down to around 2000rpm at the same speed..
Based on what logic?Originally Posted by Captcav
What RPM range do you think its most efficient at?
Fossicker
About 2000 - 2200 its at its most effecient, which is eqivulent to 90-100 kph.
RoverLord
thats more of an areodynamics thing than an engine revs thing.
Dave
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Considering the TD5 engine in stock form makes most of its torque at 2400 rpm dropping below that by 400 rpm will result in worse efficiency than stock.
As Blknight has commented, the vehicle is more efficient at the speeds you listed above due to aerodynamics....
I had 4.11 gears put in, and for a short while was running wheels too small a diameter for that gear set (was doing about 2900rpm at 110km/h)...
Fuel use was only 0.2L/100km worse...
Swaggie
When I changed from 29" tyres to 33" tyres the fuel economy improved on the highway but it became worst around town. Running at the standard gearing makes the economy a lot more consistent also than with altered gearing.
This is for a TD5
Cheers
Slunnie
~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
ChatterBox
It is based on these arguements I , cash gods willing , would like to see about a six speed gearbox. Probably not economically viable but an interesting idea.
Fossicker
I'm not sure this argument has much merit, as a car that produces all its torque at 8500rpm cannot claim that driving it at that level would result in ideal fuel economy. The best fuel economy figures that can be produced with a TD5 are at speeds of 100kph, which in standard tune is 2200rpm. The problem with this is it's 10kph below our national speed limit and would put me 50km behind on my 5hr journey to our holiday destination.
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