BMW Forums : BimmerForums banner

1 - 3 of 3 Posts

·
Registered
Joined
·
7 Posts
Discussion Starter #1
I am averaging 36 MPG, by Brim to Brim checks and wish to increase the average by around 8%. Apart from utilising all the usual economy tricks, I have heard of two methods of gaining economy as a by-product of increasing power, i.e. A. By re-mapping, (by firm Emap), and, B. By some sort of tuning box,(by firm DPT), or by any other firms, I believe the cost is around £300.
Has anyone experienced any of these products, and, can they advise any details of cost, effectiveness, problems, any actual economy gains in mpg or %age improvements. This is obviously becoming more pertinent with ever increasing diesel cost.
Cheers.
 

·
Registered
Joined
·
14 Posts
There are a vast number of companies on the internet selling tuning boxes and so called "plug and play" systems. These vary in price and the advantage is they can be fitted reasonably quickly and removed without permanently altering the software programming of the ECU itself. These also vary in quality and I would beware of certain units on the market sold on ebay etc which are very cheap but of dubious quality.

Your other option would be to go for an ECU remap. I recommend that if going down this route, you take your car to a specialist engine tuning company, who will put your car onto a rolling road and hook up the re-programming computer on whilst it is being driven 'live' at various speeds and loads etc. This will allow a fully tailored, custom ECU remap unique to your car and would offers the best efficiency.

It is an individual choice, but be wary of getting a cheap ECU remap done on your doorstep for a £150 odd by a guy turning up with a laptop under his arm and a lead to plug into your OBD port.

Faulty programming / corrupted software loaded into your ECU could cause a lot of damage.

Depending on the age of your car and any possible BMW warranty you may have, ECU remaps could show up on main BMW dealer diagnostic testers and potentially cause problems in the event of a warranty claim.

Remapping / plug in tuning boxes are regarded as modifications and you would also be obliged to tell your insurance company as well.

Having said all that, there are noticeable improvements to be had in terms of greater torque, improved overall MPG and power increases to be had.

This is a very broad field and you need to research it carefully, weigh up all the options and decide whether it is an investment worth between £200 - £500 of your own cash.

If intending to keep your car over a medium / long term period, I would go for it.

If you are going to be changing the car in the next year, it is not worth it.

If going for ECU remap, companies such as Evolve Automotive (see link below)

http://www.evo-s.co.uk/shop/index.php?cPath=6_3164_3280

come highly recommended and have state of the art rolling road / diagnostic testing facilities.

If it were up to me and I was going to be keeping the car for a long time, I would go to somewhere like Evolve Automotive, with proper rolling road / diagnostic equipment and get a custom remap done by them.

As a matter of interest, what sort of journeys and type of driving do you do?

If you are doing a lot of short journeys in the town i.e. short, stop - start, then this overall MPG figure is about right.

If driving on motorways all the time, 36mpg is slightly lower than expected.

Possible causes for a lower MPG could be a dirty fuel filter or possibly the DPF (diesel particulate filter) becoming clogged and then initiating a regeneration cycle, using more fuel to raise the exhaust temperature higher to burn off excess soot?

I always find overall MPG goes up and the car responds well to a a full oil / engine service so it could be something simple like that will fix this for you.

Hope this is of some assistance.
 

·
Registered
Joined
·
640 Posts
Or you could try one of the forum sponsors on this forum like myself (APTuning), TheEnd, Emaps or motecmike.
We are all well versed in BMW tuning and come recommended by lots of satisfied members. :thumbsup
 
1 - 3 of 3 Posts
Top