dci remap?

[sr-performance]

Hiya mate,
A remap on any car will put a bit more pressure on it.. It's how the mapping is done that makes most of the difference, we map it so there is no sudden boost of power, just nice and smooth making it a lot nicer to drive...

[davelowe]

I think what he is trying to say is, don't rev it upto the limiter and then drop the clutch!

Remapping is more complex than a top BHP / torque figure. You need to see graphs over the entire rev range. Usually things are improved over the entire range, with variations at particular speeds, - depending on what car(s) they based the new map on, and how thoroughly the rolling road tests were performed.

[wanda]

so for example if I am cruising at 70mph revs at 2300, is it to say the power and torque available at that speed would be higher?

[sr-performance]

Yes power and torque will be increased as your engine settings are optimised...

[davelowe]

Yes power and torque will be increased as your engine settings are optimised...

I think you should explain your technical report more fully. That may help your sales. Some data would be useful too - by how much would that particular engine benefit at the specified RPM? I don't doubt that it would, but you might get a massive torque increase between say 1800 and 2000 RPM, then nothing much better than the original between 2000 and 2100, then yet more difference at a different band.

Optimised is a big claim to make. Renault optimise their original map - for all corners of the globe and senarios. Just because you bump up the figures for a UK car and fuel spec doesn't mean the same thing. A 5% reduction in engine life is typical for that kind of mod, and that doesn't count as optimisation in my book.

More detail please!

[sr-performance]

Every diesel engine that is remapped will produce up to 40% more torque, and you prob know that most of the torque is in the lower rpm range and tails off when reaching max rpm. But will outperform the std torque everywhere in the rev range. and how often will you be sat at 2100 rpm? at this point you will be getting approx 25% more torque.
All cars have to do is basically pass emissions and run on the fuel quality in any country, and manufacturers also take into account poor servicing by owners..and a poorly maintained and serviced engine will reduce engine life a lot more than a remap ever will...We always advice an extra oil/filter change between servicing as manufacturers use longer service intervals on modern engines...

[direstraits]

How do you deal with encreased heat? Change the waterpump, engine block, intercooler and radiator? C'mon...

[sr-performance]

The std water pump/radiator etc is more than capable of the extra bhp/torque as it only gets approx 1degree hotter. All diesel engines are basically detuned from factory for each environment they will be in so can cope with no probs whatsoever with a remap..

[direstraits]

If you look at it this way, things might get little clearer (bear in mind that I simplify this a lot): car with a 100KW engine produces approx. 300KW of heat that cannot be used. It goes out of the system through the exhaust. If you gain another 10KW for the engine, the exhaust and other heat related components will have to cope with extra 30KW of heat energy. It is much simplified, but that's the basic principle of heat engines and their thermal efficiency. What I want to say is that even from the most efficent diesel engine you'll get only 30% efficiency. The rest is heat. More power more heat. Power corrupts, heat damages the engine.

[sr-performance]

No prob mate.. I understand perfectly what your saying..
We have never had a prob with any remapped vehicle due to extra "heat". The only time I would think a prob would occur is down to people not changing/checking antifreeze regular, it's usually lack of maintenance when issues arise..

[wanda]

So assuming I drive normally and dont go around racing all the time would I still need an extra oil change between services? I do like the 18k gap between them.

But then again the new laguna 1.5dci which has 110bhp has the same engine as mine a 1.5dci 106bhp is it to say they have also been remapped but on a less savage way.

[R55VYS]

you should be changing oil every 9k according to renault but speaking to other people and the experiences ive had, the tiny turbo on the meg cant handle the oil thickning up after 5k and puts excessive strain on the turbo. so you should be changing the oil atleast every 6k at least.

And a turbo diesel wont be affected like a petrol will by increased intake temps after remaping, ie no need to put larger FMI's on a diesel as the temps wont reach the hights a petrol will.

[sr-performance]

Hi mate,
When a manufacturer has different power outputs on same engine, it's usually turbo/injectors/software, they don't just alter map..

[direstraits]

So assuming I drive normally and dont go around racing all the time would I still need an extra oil change between services? I do like the 18k gap between them.

But then again the new laguna 1.5dci which has 110bhp has the same engine as mine a 1.5dci 106bhp is it to say they have also been remapped but on a less savage way.

The new 1.5 dCi engine in Laguna and Megane III is basically the same as the older one with 105HP, only with different pressure on commonrail, DPF, and torque on lower revs. You will have a problem with oil (oil cannot cope with extra fuel remnants in cylinders, i.e. soot, and higher temperatures) after a remap. Turbo and piston rings will suffer both from heat and from soot, and that's why the oil will sooner get dirtier, and that's the reason for oil change. Problems might also occur with high pressure nozzles which will be subjected to higher temperatures. Due to higher temperatures in the system, water pump and radiators will have to work overtime, and their lifespan will be lowered. Renault engines of 1.5L block with diffewrent power come with different turbos, different common-rail settings, and different intercoolers and engine heads. And, yes, they have a different map. But they are usually tested for more than 250.000Km. I wonder if any of those tuners test their remapped engines as extensively as Renault.

[wanda]

you should be changing oil every 9k according to renault but speaking to other people and the experiences ive had, the tiny turbo on the meg cant handle the oil thickning up after 5k and puts excessive strain on the turbo. so you should be changing the oil atleast every 6k at least.

And a turbo diesel wont be affected like a petrol will by increased intake temps after remaping, ie no need to put larger FMI's on a diesel as the temps wont reach the hights a petrol will.

My wife has a clio with the same engine as in mine in the megane cc. The only difference between the engines is that hers has a particle filter and mine doesnt. She has to service hers every 12k miles but mine is 18k with no oil changes in between as stated by Renault mechanics. Why is the same engine so different?