remapping a 3.0L deisel??

kv6mick

I have a 3L bmw X5, its a deisel which returns a reasonable mpg if driven reservedly, has any one remapped a car, if so what were the benefits to it, better economy??:D

peterkay369

All cars bar my first have been mapped, albeit not for economy. As far as im aware, most diesels do return better mpg once mapped

kv6mick

yeah thats what i heard

motorguy

kv6mick wrote: »

I have a 3L bmw X5, its a deisel which returns a reasonable mpg if driven reservedly, has any one remapped a car, if so what were the benefits to it, better economy??:D

You "might" get fractionally better economy, but they're generally remapped for better performance.

I'd my X5 3.0d remapped. Took it from 230BHP to around 280BHP from memory. Made a big difference to it.

Mr.Generous

the tiny improvement in economy is wiped out because of the urge to use the ooomph when you brush the gas pedal. bsr tuning all the way.
http://www.bsr-tuning.co.uk/products/tuning-kits/bmw/x5-series-e70/

arcon5

More like the savings wiped out by the cost of the procedure

[Deleted User]

Would the improved mpg offset the increased insurance cost of having to declare the vehicle as modified?

Mr.Generous

depends how you look at it, you are getting the performance of a much bigger car for a £500 tune up, you pay more to insure the more powerful model either way. Say you are looking at a BMW or Volvo diesel, quite a number of them are the same engine sold in different states of tune, you buy a low tune model for £1500 less and tune it to better than the more powerful one. Have a look at the BSR website and their guarantee as well as the tuning results. Google just about any sports diesel and add bsr after the model to find reviews. If you dont like fast cars you'll consider it a waste of money, how would a BMW 123d drive with 239bhp? well its acceleration times are between 11 - 17% better tuned, the throttle response will be dynamite etc. A Saab TTiD 130 bhp tunes to 213bhp and gives a 39% faster acceleration time from 100 to 150 kmh. just a couple of examples. Marmite.

gilbert_and_sullivan

Useful for shaking off those following too close, that handy sooty smoke screen laid down by many remapped Diesels deters all but the most determined tailgaters apparently.

Its all very well increasing torque by a third, but will the clutch DMF and gearbox cope with it.
Will the engine itself cope with increased loadings, probably yes but the sensible owner would service the car better to give it the best chances, how many do that.
Will the DPF cope with the extra soot, the only way to get extra power is by burning more fuel if you want to use the extra power available.
Will the car pass the smoke test at MOT time if no DPF fitted.

There will always be downsides to remapping too, its not just releasing those hidden horses and away you go blasting away from the lights in a cloud of soot, do that at night with a remapped non DPF Diesels and watch the fog in the headlights behind.

motorguy

gilbert_and_sullivan wrote: »

Useful for shaking off those following too close, that handy sooty smoke screen laid down by many remapped Diesels deters all but the most determined tailgaters apparently.

A remap wont incur sooty smoke. Any that are doing that are usually old fashioned diesels with the pump turned up OR cars running with turbos or injectors on their way out.

gilbert_and_sullivan wrote: »

Its all very well increasing torque by a third, but will the clutch DMF and gearbox cope with it.

Firstly, all X5 diesels are auto, so no clutch or DMF to worry about.

Secondly, for other cars generally yes. You're not using all that torque, all of the time. Maybe at absolute end of life, you're taking a bit of time off the clutch, but thats something you have to balance out.

Thirdly, in the case of the diesel x5, i'd a couple of 535ds remapped to around 340/350BHP and around 500lb/ft of torque and the gearboxes dealt with it no problem.

gilbert_and_sullivan wrote: »

Will the engine itself cope with increased loadings, probably yes but the sensible owner would service the car better to give it the best chances, how many do that.

Have you any direct evidence of a link between remapping and a need to service more regularly?

gilbert_and_sullivan wrote: »

Will the DPF cope with the extra soot, the only way to
get extra power is by burning more fuel if you want to use the extra power available.

Remapping doesnt make a car more "sooty"

gilbert_and_sullivan wrote: »

Will the car pass the smoke test at MOT time if no DPF fitted.

Remapping does not remove the DPF.

gilbert_and_sullivan wrote: »

There will always be downsides to remapping too, its not just releasing those hidden horses and away you go blasting away from the lights in a cloud of soot, do that at night with a remapped non DPF Diesels and watch the fog in the headlights behind.

I strongly disagree with this - diesels blowing out smoke is not caused by remapping.

Our most recent diesel remap was my sons '09 120D M Sport which was up from 177BHP to around 220BHP. No increased smoke at all.

I've never had any increased in anything i've remapped including various Golfs, Passats, Peugeots, BMW 530d, BMW 535ds, BMW X5, etc.

motorguy

Mr.Generous wrote: »

A Saab TTiD 130 bhp tunes to 213bhp and gives a 39% faster acceleration time from 100 to 150 kmh. just a couple of examples. Marmite.

Was the TTiD not 180BHP, not 130?

Surely the 130 was the standard diesel? It would seem a waste of twin turbos and produce only 130BHP?