Why map a diesel ?

[nath]

What are the advantages of mapping a diesel ( gt tdi 140 ) for example . I don't drive fast and wonder why you would map a diesel ?  I don't do many miles either .  Just wondering really . Would it not make fuel consumption worse ? Would it not make more sense to by a petrol Gti ?  Thanks     Is there a Map that would suit my driving without putting extra wear n tear o the car ?

[Andy]

Mapping a diesel makes the car drive better and gets rid of that terrible flat spot they have..A good tuner will be able to make a map for your car to suit you..If your not doing a lot of miles ignore all that and get a Gti

[rich83]

Resistance is futile.  BUY A PETROL!!!!

[Andy]

 

[xjay1337]

Driving a standard diesel to a mapped one is a huge difference.
As standard TDIs have a very flat delivery, they peak and then sort of fade away very quickly. With a remap you will double your powerband width, from around 1800-2800 in a normal car to about 2000-4200 in a mapped one.
You also gain fuel economy because of the way the boost and fuelling is done, making it more efficient at part throttle openings, meaning you can expect around 6-8mpg increase on a steady cruise.
If you don't drive many miles you should not have really bought a diesel to be honest! That being said driving a GTI even around town the difference is huge, the worst I got from my 1.9 TDI was 450 a tank, the worst I've had from my GTI is 260 (so far...) so really the TDI is more economical.

But hey! 

[rich83]

You don't gain fuel economy. Anyone telling you that has a four foot wooden nose.

[xjay1337]

Yes you do Rich.
I know that first hand.  
(I have a 4 foot wooden something though  )

[SkyJawa]

Because often diesels gain even more bhp and torque than petrols quite often while adding even better mpg when driving normally.

[Trekmeister]

You don't gain fuel economy. Anyone telling you that has a four foot wooden nose.

I gained better economy by about 5mpg for certain, i never got 60mpg ever and its a lot smoother

[rich83]

I've had both remapped diesel and petrol car.... Never had increase MPG with either of them. Could be down to lead foot disease.

[Trekmeister]

I've had both remapped diesel and petrol car.... Never had increase MPG with either of them. Could be down to lead foot disease.

Definitely,  if I put my foot down I average 40mpg which is still good tbh. To get really good mpg I have to drive like a nun

[xjay1337]

I've had both remapped diesel and petrol car.... Never had increase MPG with either of them. Could be down to lead foot disease.

Driving style : Knob head haha.
If you drive quicker then completely agree it's worse than before but on cruise control on motorway...? Better :)

[Andy]

Mine  is better also but never achieved it thou as I like the sound of the milltek

[GrayMK5GTI]

I haven't mapped my CR 170 TDI (yet  )

But have lots of mates with mapped diesels. Think Jay has the reasons pretty much wrapped up further up in the thread, if you want a bit more poke and a more flexible engine then a remap is for you.

Some people also have remap to support other modifications like DPF removal or EGR removal.

[slider955i]

i have had many petrol cars and a couple of diesels , nothing better than mapping a good petrol turbo but my god the torque from a diesel is fantastic , got my gt sport 170 done and its amazing , 208bhp and 338 ft lb torque