hi all, sorry if this has already been covered. But I couldn't find a post about it, On the rs monitor what boost pressure are people getting (standard map)
Mine is a 265 and goes up to 1250-1300 if I remember correctly. Renault said they upped the pressure by 0,1 for the 265 so a 250 should read around 1150-1200?
no I wouldn't say it does, ive only had it a couple of months, just noticed the boost on the monitor doesn't go full, and when it feels like its on boost the bar doesn't show any boost until u floor it! not too sure how accurate the monitor is?
Should be up on boost! Colder air is denser air so more O2 present. Map will adapt by adding more fuel, delaying ignition and turning up the boost! I often got over boost on previously modded turbocharged cars from other Marques.
Does it not depend on what fueling strategy the ecu uses? If it has a boost target then the turbo will back off a little as it doesn't need to work as hard due to the higher air density?
Yes but it will need to increase fuel trim a bit to compensate for the extra O2. As you say, in terms of boost it depends on how they are mapped. I'm guessing these are torque mapped rather than boost mapped. So the ECU will be looking to achieve a set torque from the engine at certain rpm points taking into account throttle position as a basic request. Torque will come from airflow or airmass (not sure how it's read on this engine, probably mass). If for a given throttle position, engine RPM, engine temp, air intake temp, ignition feedback via knock sensor, O2 in exhaust is all read and the target torque (via air mass) isn't achieved then it will increase boost until it does. The limit will be governed by what's mapped into the ECU and read by both MAP sensor and MAF. So it's reasonable to see variation on boost depending on things like intake air temp. Fuel grade will also have an affect as better fuel (higher octane) will allow the ignition timing to be retarded which will result in higher peek combustion pressure and more torque.
