Quote:
Originally Posted by winmutt
How are you testing boost? How did you test it and listen to it?
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As far as testing boost, basically through the boost gauge and seat of pants, my boost gauge originally connected to intake manifold post intercooler and plumbing. I get 5 psi there. I then moved the gauge source to the turbo pressure line at the turbo itself, same results 5psi max. the car feels a little doggy and it it not reading the same static measures that I have been using for years to monitor overall running health of the engine, flat road, 80mph 3100 rpm, 7psi boost, 650F EGT
Currently I'm 80mph, 3100 rpm, 4psi boost and 750F EGT. From this I can tell that the boost is down and the fuel (extra due to lack of boost) is slightly increasing my EGT's.
as far as listening to it, I can hear a boost whistle as the turbine spins up, as it maxes out at 5psi I hear a wooshing noise as if air is escaping but not venting to atmosphere more like bypassing the wastegate if tha makes sense. I do not see any signs of external leaking at the turbo assembly, no signs of soot on the outer case anywhere, nor at the downpipe, when I had the cat removed, while idling and on the lift we checked for exhaust leaks and could not find any so, I'm at a loss other than possibly the wastgate spring either very weak or possibly broken allowing the wastegate to stay open.
Other suggestions?