Hi all, purchased a barn find S4, free'd all the callipers and did some repair, sealed up the leaky exhaust and wrapped the split flexi section, It was in limp mode, somebody had put the n75 and the other one next to it mixed up, fixed that, ran good, took it for a run, G66, knock sensor 2 code, pulling power, replaced the sensor, (wiring had rubbed through on block) pulls better now, but still its holding back, it boosts well initially but then it tails off, did the n249 bypass, slightly better feeling, but still the same problem, n75 seems to be ok, im thinking the wastegates at this point as the diverter valves are brand new 'go faster bitz' ones, (unsure of correct way round fitment though!) if anybody can help me with that one.
Then it throws a low voltage code, when i put the lights on and the heaters, it drops to 7 volts and wants to cut out, idling, with everything off, its giving 10-11 volts on the gauge, Would a bad alternator cause power to tail off up the rev range? Managed to get it to 130mph but it wouldnt go any faster than that at all. Engine itself seems strong and the boost is all there down low, (did a boost leak test) holds 15psi no problem, at that point the oil pan starts to bubble via the turbo seals.
Can anyone point me in the right direction on what to do next, im going to test wastegate cracking pressure next, but after that, im a bit stumped, fual filter change maybe?
Many thanks. Pilla.
Then it throws a low voltage code, when i put the lights on and the heaters, it drops to 7 volts and wants to cut out, idling, with everything off, its giving 10-11 volts on the gauge, Would a bad alternator cause power to tail off up the rev range? Managed to get it to 130mph but it wouldnt go any faster than that at all. Engine itself seems strong and the boost is all there down low, (did a boost leak test) holds 15psi no problem, at that point the oil pan starts to bubble via the turbo seals.
Can anyone point me in the right direction on what to do next, im going to test wastegate cracking pressure next, but after that, im a bit stumped, fual filter change maybe?
Many thanks. Pilla.