[BiturboS4] Turbos & Warm-up

john sonty erhti at yahoo.com
Thu Aug 29 09:30:56 EDT 2002

4k rpms?   You're a brave man. I barely hit 2-3k rpms and try to
adjust so as not to lug the engine.

--- "Edwards, Dave" <Dave_Edwards at iOra.com> wrote:
> Phil,
> The turbos are "spooled" i.e. turning, ALL THE TIME. They only
> stop when the
> engine is off. Whilst your boost gauge is 0 or negative, the
> diverter valves
> are open, so all the air flowing out of the intercoolers is
> immediately
> sucked back into the turbo inlet.
> Positive boost occurs when you open the throttle, the diverter
> valves close,
> so that pressure can build up in the inlet manifold.
> Yes, using a boost gauge will help you be gentle on the turbos
> during
> warm-up, but only as a guide, not a rule. It is engine revs
> which really
> count, as the rotational speed of the turbos is pretty much
> related to
> engine speed for most of the range.
> I have no firm rule for warm-up, but I generally avoid revving
> above about
> 4000, and try to keep the boost below about 0.5 bar until
> warmed up. I admit
> that I sometimes use boost above 0.5 bar for short bursts
> whilst the engine
> is still 'cold', but only sparingly.
> Cheers,
> Dave
> _--__--__--
> Message: 8
> Date: Tue, 27 Aug 2002 07:45:37 -0700 (PDT)
> From: Philip Pace <pjpace at yahoo.com>
> Subject: RE: [BiturboS4] 10k service - OK
> To: Biturbo <biturbos4 at audifans.com>
> Well this is a nice time to ask, since had been wondering
> about this for a
> while. So I got a boost gauge and while I'm in the warm up
> period, I keep it
> at 0 or below. BUT, when it's at 0 (which it does a lot), that
> means that
> the turbos are spooled, just not creating boost? If so, is
> this an ok
> situation or should I stay with as little pressure as
> possible? TIA
>      -Phil P.
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