[urq] Reality Check (Dyno results) Follow up (long)

[Buchholz, Steven]

... it looks to me like your engine is in pretty reasonable shape from what
you describe ... with the exception of the boost level.  Your reduced boost
could very well cause the power loss you indicate.  Your description of the
turbo's sound makes me think this is where you should be looking ... it is
hard to describe sounds to others, but I would call the sound of a properly
functioning turbo more of a hissing sound than a whine.  It may also be that
your wastegate is adjusted conservatively ... I'll bet your wastegate cap
has the adjustable perch ... so you should be able to crank it down fairly
easily with an Allen wrench.  

Steve B
San José, Kaleefohnia (USA)
> 
> Perhaps the previous owner got scared and ordered to Œcut¹ 
> the power by
> decreasing the pressure of the WG spring. Fact is, the current boost
> pressure is only 0.45 bar (absolute) and should be 0.8 bar if 
> I¹m correct.
> 
> Last but not least: could the turbo loose 25% of power by 
> age? I know it
> doesn¹t smoke or has excessive play, the propellor blades are 
> still in one
> piece (checked). All it does is wistle quit heavily, maybe 
> the air filter is
> blocked? I¹m not using the original paper filter but the 
> PiperCross OEM.
> Could I accidentely reversed this filter and now blocking air? If it¹s
> dirty, could this Œdirt¹ cut 25% of BHP?