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21/10/2014 at 6:48pm
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hi, sorry for the delay in reply. In answer I have owned many cars, vans over the years and have had a few of them remapped. Not one showed any improvement in MPG. You just need to think about it really. some of the cheaper black boxes just allow more fuel into the engine by prolonging the injector fuelling. the result of this is a little more power but no improvement in MPG (how can it). the better boxes adjust the signals from the air intake, pedal position and temp and load being placed on the engine, and works out the best amount of fuel to use. The second box will give you more power and torque as it suits the engine more. But again MPG will not go up unless you are very very light of foot, and if you are whats the point in having the remap or the box.
I have my fiat 2.8 engine remapped to 370 torque and 180bhp. this being in a autotrail Dakota. whats it like. well before the Dakota would not hold 5th on the motorway, so it was always up and down the gearbox. now it will hold 5th all day. OK I hear you say higher gear, better MPG. well no not really, the autotrail is a large heavy unit and yes the engine is running much better the fact that I can keep in 5th also means that I can push on a bit more. so the MPG remains the same.
the big boys do make their cars cheaper to run, well some of them,but there are many factors to take into account. my BWM 525d touring as an 8 speed autobox, stop and start and returns around 45MPG all day long and I don't drive slow. my partner drives a 2lt diesel mini cooper with auto box and no stop and start. her car returns 42mpg. we took out a new mini 3 cylinder for a 200 mile test drive. BMW said it would do 68mpg. well all we could get was 40mpg. why was that. well the engine was working to hard and the manual gearbox was not so great. There are just so many factors to take into account and no little black box, or remap is going to improve MPG for so many reasons know matter what people say. they improve the engines ability to produce power that's all.michael
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Topic: DTUK Tuning box
