[Vwdiesel] Turbo change and N75 valve

[Jason]

N75 is a frequency valve to control boost.  It's signal comes from  the
ECM.  It does not sense anything.  One port is vacuum,  one is intake,
lastly goes to the vacuum actuator on the turbo.  If you are loosing boost
when passing your turbo vanes are likely siezing from carbon build up.
Time for an Italian tune up (or new turbo) .

Jason
On 2013-10-15 5:18 PM, "JameyBidwell" <jameybidwell at gmail.com> wrote:

> Didn't catch the exchange on a turbo swap, so I'm not sure what the reason
> for changing or removing the N75 was.  But contrary to popular belief., the
> N75 does not regulate boost; it relays a pneumatic signal to the "brain,"
> which then senses and corrects overboost by reducing injection metering (a
> very unpleasant surprise if it fails when you're trying to pass someone
> uphill on a 2-lane road in Maine.  Ugh!)  All that to say that there's a
> certain match between turbo, manifolds, N75, and brain that might bear some
> closer looking into.
>
> 'Best,
> Jamey
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