275 RS Monitor and engine power reading Is it accurate?

To be honest, I don´t have the car much time ago to give an answer, but I think it isn´t very accurate. Anyway, I don´t use to see that parameters, only oil and intake temperatures. Sincerely, I thought the RS monitor was more useful. For what is need the throttle position? Or brake press? Or G-forces? The only good thing for me is that you can chose the gas sense in sport mode as you prefer, and the temperature parameters. Just my opinion!

 

For boost pressure it should be accurate I would have thought as its coming from the ECU. Keep in mind boost will taper off towards higher RPM , so your max boost will be seen lower in the rev range .

Oil temperature seems to be a predetermined calculation and not direct from a sensor , there isn't any in the sump so would not rely on it to convey oil temperatures accurately (the temperature does rise very quickly compared to a proper sensor in the sump)

The power figure is going to be as accurate as the ECU can judge it to be but obviously not 100% . If its using the MAF g/s readings it will come pretty close to the actual output (gram per second /0.8)

 

D_K, in my experience, in the sump the oil temp. is at least 10ºC less than the block. So, don´t think the Renault engineers fit a sensor in the oil pan, just don´t think! I have seen worst things!

 

Yes 10 degress at least of a difference depending on location due to heating . A temperature from the sump for me is favourable as it gives an indication of oil conditions entering the oil pickup and ultimately bearing surfaces . From what I believe there is no individual or combined oil temperature sensor on this engine contributing to the RS Monitor , can anybody else confirm that ? I have started a journey from 5degree celsius conditions were the car was left cold overnight , after 3 km oil temperature reading was at 50c and climbing almost as fast as the coolant temperature once that hit 70c and began to show . For me this is not a good indicator and I continue for at least 15mins of continuous driving before beginning to use the car more spiritedly..

Yes would be nice to confirm OBD and RS Monitor are both showing the same data , I would be surprised if not . I have not seen a factory boost graph but from general experience that seems like a normal Megane RS to me . Its an interesting topic and good for clarity.

 

The Magane engine is fitted with an oil cooler, that is fitted behind the oil filter, this also acts as a oil warmer as it uses the coolant to heat the oil up, but then cools the oil once it goes above the engine coolant temp

 

Very interesting thread! About the oil temp. sender, I remember some car where the oil temp. and level was the same sender. In that case, maybe our Megs works the same way. I had been with the car just now, shame I don´t realize to count the wires of the level sensor. If it have 3, would be the temp. sender too.

 

99.9% sure its two wires

 

Well, now I´m thinking, maybe the sensor take negative through the same block? In that case, those 2 wires would be signal for level and temp. Damn electricity! Never understand it!

 

could try and unplug it, then see if it reads a temperature

 

Good point Ian, sometimes the best test is the easy one!

 

it will prove it one way or the other

 

My 250 hits 1.15bar so i think you might have a boostleak, although i'm sure things like altitude and ambient temp plays a part aswell.

Thats the number i hit with a small boostleak too (sure in my case it affects spool mostly). Gonna try and get it fixed soon.

Also my power level reads 250 everytime so i think its just some number that corresponds to whatever revs you are on, probably a load value in there somewhere too.

Someone else probably knows better tho.

Logged the boost via odb like a year ago looking for a fault, and rs monitor seemed to read that fairly accuratley. Not sure if it was reading same as MAP or intake pressure sensor tho, was one of them anyway. Update frequency was just a tad slower and obviously it did some rounding up and down.

 

Guys, I have also an 275 Trophy and my experiences are pretty identically. First, to my opinion the R-Link will never show the real engine Performance. The display is Gimmick, and it doesn´t anything else as to read the rpm and throttle load and Displays the standard power curve whats the engine is rated from Renault. Full throttle and 5500 rpm means 273 hp. If this figure should be measured, you would have installed a dyno inside the car, isn´t possible. The only physically possibility to measure the engines real power would be to have a engine combustion pressure sensor ( what has no car at all) even then you don´t know the friction the engine has. It´s some engineering knowledge involved, so lets state that the displayed power ist only from the Standard Renault diagram. I´m pretty sure that if you have some engine mods, the display will never show -let say 320 hp. >It shows always stock output.

The oil temp is right, it´s a display with an algoritm what calculates the water temp, time of operation gradients which are heating the engine, ambient temp, engine loads and rpm what heats the engine. I think the oil temp is 99% realistic. It heats very quick, thanks to the oil heat exchanger with the water cooler. Oil and water temp equals out to similar figures, normally maybe 85°C.

About the boost pressures: My car shows very similar figures, with full throttle in 3. or 4. gear it won´t reach more than 1000 mbars, some guys with 275 are telling about 1350 -1400 mbars. Strangely, sometimes it goes up im 2. gear in race mode to About 1300 mbars, but it´s different and not basically repetable. Anyway, I´ve not the feeling that the car is low on power, but I think there are big influences from ambient temp and water temp with boost, the ECU will sense the knock figures and corrects spark advances and boost. I have replaced the timing belt at Easter and replaced as well the Thermostat because my car didn´t exceed 70° water + oil temp that time (was cold outside). With the new stat, water temp raised up by About 15 °, now it will be usually 85°, but in Germany it´s currently very hot (mostly 25-28°). Inj the meantime, I suppose that the old stat might be a modified low temp stat for a modified engine and I`m thinking about to reuse it again in summer ( have to provide a new one, I`m an idiot and have scrapped it). With the current one, temp is very quick in the 90-100° region whats not good for max power.....the ECU will down-regulate the engine I think About installing an stand alone boost sensor….

 

I have an Obd reader and on Autobahn, with several tests pulling the gears, the values given by both RS Monitor and Obd, were very similar(both read the Ecu info).
but I think it's all "invented" because the values are calculated in relation to the throttle position/ rpms / temperatures, etc.
It's not a real time values,just calculations.

 

I would be interested in finding an offical Renault chart what shows the boost pressure over the rpm and torque figures at full throttle. Just for knowing whats about boost pressures what are displayed on the R-link, nobody seems to know stock ratings from Renault. It´s not helpful to see 950mbar anywhere on the rpm range and I don´t know what boost curve is according to stock condition. 100 mbars missing or not?

Not even the Renault dealers knows stock conditions, at least mine doesn´t. Maybe Renault doesn´t state boost figures to avoid complaining customers...

 

I don't have R-link, just the RS Monitor. But my car it's remaped and shows the full line in the boost pressure, so I assume that makes more than the original values. I think that full original makes 900-1200 mbars approximately.

 

I did a Stage 1 mapping for my 275 Trophy (so to 300HP and 440nm). Car goes way better now. It has been done by company called 69 Performance. What is now not working is the engine power gauge on RS monitor. HP display goes up to max 200 HP. Pressure goes up to 1400mBar as far as I have seen.
What do you think it is? I will surely go back, so they check it out. I am just wondering if someone else has this kind of an issue before.

 

Now when I am driving the car a bit more, it seems that the max power on RS Monitor went up to 240 this morning... lol, whats going on? Does it adjusting it self in any way?

 

you are absolutely right, just Standard Renault diagram.

1300 mbars, and 1350 mbars when hot.

 

Muxa, thanks to your last pic, I notice the RS monitor in England show water temp. Here in Spain, don't show that parameter.