I stand corrected on that then. So he has been having problems since the engine revved up and it overboosted while hitting the patch of water.
If you google it he has posted on various other forums, didn't have any coolant in it and it was over heating.
Just some info on the boost control by the Megane 3 RS ECU as people here are claiming it could be the faulty actuator: A broken actuator, or even fitting a Forge actuator with the strongest spring and high preloads (the ECU can barely open/operate it that way) will not lead to increased boost pressures at the intake manifold of the 3RS. The 3RS ECU has a much more advanced way of regulating boost pressures at the intake manifold compared to the Mk.2 RS. The 3RS controls boost pressure in the intake manifold additionally using the throttle flap position (yes, I have extensively monitored this using data logging with an RSTuner from Fastchip). Even if it can not, or barely control boost pressures through the actuator (i.e. an actuator malfunction), it just closes down the throttle flap by as much as 90%. With the Mk.2 RS you can happily add a little extra boost than what your ECU mapping provides by fitting a stronger spring in the Forge actuator, if you have that fitted. With the 3RS it is practically impossible. You can create overboost in the intake piping with the 3RS (the measuring point at the turbo outlet measures this) when you forcefully modify the actuator. I've had it intentionally spike up to 2+bar, but the intake manifold pressure kept at the right boost pressure according to my mapping (in my case 1.45bar, stage 1 mapping). And as Jamie said as well, it will happily go into limp mode extremely quick in case of _real_ overboost situations.
Just a thought. I wonder if my actuator was changed over for a damaged one before I got the car without me knowing?
So what has actually happened? you flooded your engine? or the actuator failed? or the car previously had an accident? or all 3?
Correct me if I'm wrong Sparta but you havnt been very forthcoming with all the info about what happened. I spoke to Boardy who you spoke to on the phone. As far as I know you hit a couple inches of water at motorway speeds, the car coughed and spkuttered but you continued to drive it for a month until it properly let go. That is what I have been basing my posts on about this
No mention of the water on this thread. http://www.rsmegane.com/showthread....p0234-(check-injection-anti-pollution-system) My old 225 turbo used to whistle. Took it off to fit the 250 one and the whistle went. Checked the old turbo and it had loads of play and leaking a bit of oil.
I felt the car aquaplaned on the motorway.couldnt have been that much water as it was on the m40. I got the check injection system engine with the code p0234. Mechanic said just to watch it after clearing the error. Car had a slight miss which turns out to be on cyclinder 2. a month later the whilst coming of a round about onto a dual carriageway car started knocking. Not it sure what else to say as I've typed that various times.
After the front end damage did all the under trays get put back or were they left off? Did the mechanic not give you any input over the fact that the was misfire?
All undertrays were put back on. The old mechanic didn't really give an input, he just cleared the error.
Take a look in the ebay ads section found a car similar to this 250 is this car for sale Sparta? No metion of engine though?
