ECU Remap

atrixblue.-MFR-.

JustinR1979 wrote: »

Car makers spend billions to make engines efficient, materials light etc for lower emissions and higher mpg.
I don't believe a chap with a laptop writing generic maps can achieve better mpg and better performance at the same time.
I've always equalled the mpg when on a run.

OK look at it this way!


You have 3 models with the same engine in the range, engine is 1.6TDI for E.G it has 90hp in one model 120 in another 160 in another, so whats the difference, its the same engine, they all pull about the same ECO figures and share the same parts, its all software in the ecu, so when you get that much of wide scope to play in the ECU with remap you can get your 90HP upto 160 with a reflash and not lose out on much in the way of eco figures.

Nodding_Donkey

JustinR1979 wrote: »

Car makers spend billions to make engines efficient, materials light etc for lower emissions and higher mpg.
I don't believe a chap with a laptop writing generic maps can achieve better mpg and better performance at the same time.
I've always equalled the mpg when on a run.

It's because the guy with the laptop doesn't have to make it meet type approval emissions levels at prescribed rpm.

JustinR1979

atrixblue.-MFR-. wrote: »

OK look at it this way!


You have 3 models with the same engine in the range, engine is 1.6TDI for E.G it has 90hp in one model 120 in another 160 in another, so whats the difference, its the same engine, they all pull about the same ECO figures and share the same parts, its all software in the ecu, so when you get that much of wide scope to play in the ECU with remap you can get your 90HP upto 160 with a reflash and not lose out on much in the way of eco figures.

Same engine block, many parts will be different, injectors, camshafts, turbo etc. The oem mapping will obviously account for all of these changes.

Nodding_Donkey wrote: »

It's because the guy with the laptop doesn't have to make it meet type approval emissions levels at prescribed rpm.

I was referring to a generic map, this isn't 100% matched to the engine as an individual.
So the guy with the laptop will increase the emissions and the economy?
How would worse emissions equate to improved mpg?

jimjames

Stoke wrote: »

The thing with remaps is when they save it'll save you money by making your car more economical, it will, but it will in certain cases. I know someone who had a Golf TDI remapped. It made the car significantly faster, accelerated massively quicker. They also claimed he gained economy. However in reality, he lost economy around town and slower driving. He gained economy while hammering it down the motorway averaging something like 68MPG while doing 75MPH which is seriously impressive.

I think remaps are a great. The fuel consumption you lose will be quickly offset by the amount of added enjoyment

Had a couple of remaps, both fantastic. Both give better MPG than before but driveability is the best change. Low end torque is way better than before and less flat spots in the rev range.

MY Golf had one which remapped the 130 PD engine to around 175. Fantastic fun to drive but with 50+ mpg.

Review here
http://vw-golf-mk4-tdi.blogspot.co.uk/2014/02/vw-golf-tdi130-remapping-review.html

Bantex_2

k3lvc wrote: »

Well worth the expense if you're going to exploit the changes - I did it for the extra overtaking poke and to make my C320CDi Merc into something special i.e 50mph to 100mph (abroad of course) in the blink of an eye

Would I do it if I didn't want the extra performance - no

Did it save me money - no (but it did give the same indicated MPG despite the extra performance)

Did it put a mahoosive on my face when I buried the pedal - :D:D:D:D:D:D:D:D:D:D:D:D:D

For your purposes if you did it I'd make sure the horses had some extra padding or were belted in

Often wondered why people who want a proper performance cars buy diesels.
Why not just go for petrol?

IamNotAllowedToUseMyName

FWIW, the Mercedes 220CDi and the 250CDi are identical engines, just with a remap.

Nobody has mentioned insurance. If you remap you should notify your insurance or else you have invalidated your insurance - which is not an economy measure.

Manufacturers don't necessarily develop a map for economy, they develop a map for the lowest score on the standard government fuel consumption tests so in principle you should be able to get a better economy for the type of driving you are aiming for.

Gloomendoom

Hintza wrote: »

Can you guys give me the pro and cons of an ECU remap. With emphasis on a 3.0 CRD Mercedes in the Jeep Commander/Grand Cherokee.

Car will be used for towing horse trailer mainly <2 tonnes mostly, but on the odd occasion might approach 3 tonnes with a flat bed.

Annual mileage will be about 8,000 - 10,000 miles sometimes sitting for 3-5 days at a time.

Power increase would be a bonus but I am looking for more MPG which I guess I'll get if the car is running a shade more efficiently.

Thoughts? Worth the expense?

I have a car with the same engine. It's been remapped for extra power (it is quick) and it costs me about an extra £100 on my insurance policy. MPG is about 1-2 mpg less than with the standard tune.

Gloomendoom

Bantex wrote: »

Often wondered why people who want a proper performance cars buy diesels.
Why not just go for petrol?

Using my car as example, the remapped 3.0 diesel is quicker than a the standard petrol 5.7 litre V8 version while still returning 35mpg. The 5.7 petrol struggles to better 20 mpg. To better the diesel performance I would need to buy the 6.1 or 6.4 litre petrol, both with sub 20 mpg consumption.

I am considering it.

jimjames

Bantex wrote: »

Often wondered why people who want a proper performance cars buy diesels.
Why not just go for petrol?

Low down torque is still far better in a diesel.

And did someone mention fuel economy? How many fast petrol cars return 50mpg average and 60+ mpg on a run?

Gloomendoom

JustinR1979 wrote: »

I was referring to a generic map, this isn't 100% matched to the engine as an individual.
So the guy with the laptop will increase the emissions and the economy?

Generic maps aren't necessarily that bad. After all, that's what manufacturers install at the factory.