Updates
Replaced upstream lambda sensor and its not had a hissy fit since, runs great again no more rough cold starts.
In other news ive been chasing what i thought was a boost leak for the last few weeks.
Just before Trax i noted that it did not feel as lively as just after mapping, it still went well enough and would still light the tyres up on boost in 2nd gear easily though. No warning lights or nothing.
Stuck torque on the obd for a quick and dirty check of what boost pressure the map sensor was reading - boost was quite low, spiking for a split second to around 1.3bar then straight down to 1.1bar. Almost wastegate pressure, when mapped it was set up for around 1.5/1.6bar.
Hooked up clip and done some logging to confirm torque was not telling lies.
Next step was to pressure up the boost circuit to check for leaks. Had it to around 2bar pressure and leak tested the inlet. No leaks, so comp tested it as above and all good.
I had a feeling this was n75 related or actuator. I run a 250 green dot actuator which are fairly strong but never say never i guess.
I had a new gen ren n75 in stock as bought it just incase before mapping. Fitted it and took it for a test run, straight up to 1.5bar and back to a handful on boost.
Torque steer is ridiculous once again, if you hit a bit of camber or a bump on boost you really need to hang onto the steering wheel. Its down to crap spring/shock combination which will be sorted soon. Ive narrowed it down to the fact it squats so much on the back, it makes the front lift 25-50mm which must chuck the toe out massively.
Good suspension and a bit more positive castor and a good geo setup should fix this.
Ps has pleasure of showing up a lad in a m135i when testing. I was making a little bit of progress and passed him, his neck nearly snapped, then from a 4th gear roll i pulled away pretty easy
so much fun on the roads.
Thanks for reading!!
