[BiturboS4] Turbos & Warm-up

[Philip Pace]

Excellent. Thanks.

Oh, when you say, 'warm up' are you talking about the oil temp or the engine
temp? I'm really easy on the engine until it's warmed up (couple minutes), and
I don't built positive boost until the oil is warmed up (10-15 minutes). Is
that about right? Thanks again
philpace

--- "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.
>
> Dave
>
> Date: Tue, 27 Aug 2002 07:45:37 -0700 (PDT)
> From: Philip Pace <pjpace at yahoo.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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