[BiturboS4] Turbo failure modes
SHEROWSKY at NETVA.COM
Thu Oct 10 17:07:06 EDT 2002
I don't know that idling your car to warm it up is necessarily bad for it.
It isn't suggested because of increased emissions and wasted gas. For my
everyday day cars (allroad and RAV4), I really have to let them idle to warm
up. I live 4 miles from work and driving cold from start doesn't let the
coolant reach operating temperature let alone the oil. Also I immediately
turn onto a 55 mph highway after leaving my house. I think in that
situation, running up to speed on a cold engine would be worse than idling
it for a few minutes before driving away.
----- Original Message -----
From: "Philip Pace" <pjpace at yahoo.com>
To: <biturbos4 at audifans.com>
Sent: Thursday, October 10, 2002 1:21 PM
Subject: Re: [BiturboS4] Turbo failure modes
No. Your car idling without moving isn't good for it. I think driving
for the first 5-10 minutes is the best way to go (though I do let me car
up' until it drops to the typical idle RPM, and then I start driving...
carefully). Plus, it takes really really long to warm up the car when it's
idling. Driving does it quicker.
--- daniel chisholm <dbc112 at yahoo.com> wrote:
> Would it make sense to let the engine idle and heat up? The turbo will
> move and oil will circulate faster when you first drive..
> Philip Pace
> wrote:Awwwww man... per your last paragraph, I didn't know about them
> fast as the RPMs go north. My problem is that I try to build _no_ boost
> I hit 175 (the second tick). I set my own max RPM at around 3500.
> Your explanation is excellent, Dave. Thanks for the input and I'll
> at my girlfriend and see what she has to say about it NOW.
> --- "Edwards, Dave" <Dave_Edwards at iOra.com> wrote:
> > Phil,
> > I'm no expert, but I do talk to experts whenever I get the
> > have told me so far that the warm-up is more important than the
> > I think you're right that turbo failure is most likely to actually
> > when the turbo is hot, especially when it's spinning fast. But
> > likely to occur when its cold, because the oil is not lubricating
> > As long as the turbine is not spinning much that's OK. However
> > turbine fast whilst the oil is not lubricating properly is bad
> > AFAIK there are the following main failure modes:
> > 1) Turbine 'seizes' up. Mainly due to lack of oil, probably from
> > Reason is use of semi-synth or mineral oil, and/or not cooling
> > properly.
> > 2) Turbine bearing wear. Mainly due to improper lubrication.
> > above, but also due to not warming up properly.
> > 3) Turbine blade stretch. Due to overspin. Reason chipping to far
> > boost (for given air flow).
> > The main point is that turbos often fail for a combination of
> > just one. If you want your turbos to live long then you need to
> > the causes.
> > Regarding the 2500, yes I did not make myself clear. What I meant
> > keep the boost AND the engine revs low. Yes I do have a boost
> > don't need it during warm-up: As you know, trying to drive the car
> > example no more than 0.5 bar boost is not easy as once the turbos
> > producing such a boost, it's too easy to go higher. No, much
> > be gentle on the gas and you know that there's probably no boost
> > without even looking at the gauge.
> > However my main point about the 2500 rpm is that if you gently
> > the car but don't change gear, you can get the revs well above
> > registering much if any boost. As a result you might think that
> > easy on the turbos, but you're not: The rate at which the turbos
> > related to engine revs. They are still forcing air into the
> > however most of it is being recirculated by the DVs. Yes they are
> > stress because of the recirculation (lower pressure differential),
> > nevertheless spinning the turbines fast whilst the oil is cold is
> > advisable.
> > As I said, I'm no expert and am ready to be corrected if I'm
> > Cheers,
> > Dave
> > --__--__--
> > Message: 15
> > From: Philip Pace <pjpace at yahoo.com>
> > I agree, but was told recently that the warm up doesn't matter
> > ow many turbo failures happen during the winter months in cold
> > Warming = up the oil takes forever under those circumstances. If
> > stress on the turbos when they're cold, wouldn't you think that
> > fail when it's cold out? All I could say was that cold causes them
> > but heat ultimately destroys them. She didn't buy that. Can you
> > this?
> > Also, you say that you keep the RPMs below 2500? That's when
> > to get the most boost! Do you have a boost gage? I was surprised
> > and = how boost is on the car. Maybe you already know. I've been
> > in a lower gear longer and overall boost is a lot lower during
> > My 2¢
> > -Phil
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