[urq] Hot Start/Thermal wrap

[Andrew B]

Saw it in the bentley or ISTM.  Looked like two pipes, one coming from
the WG, the other from the turbo, but they didn't meet until just
before the cat.  It could have been from a 5000 or something.  The one
I have is about 3" diameter, thick steel, with a very heavy piece at
the front.  The O2 sensor was in the thick piece, just after the turbo
IIRC.



Good news.  Car cranked after about 3-5 minutes of sitting this
afternoon.  This was after a 25 minute drive, mixed stop and go and
highway.  I didn't baby it, but I didn't kill it either.  Didn't crank
immediately after I pulled in, perhaps it would have if I held it
longer.  Temp outside is about 96!

I only wrapped until about 12" from the turbo, I included the
wastegate pipe and about 3" after it.  My battery has 875 CA at 32
degrees.  700 at 0.

Thank you for advice and suggestions.  I will wrap the top of the tube
if I can get to it.  It's not easy wrapping it while lying on your
back underneath the car.  Maybe I can get at it if I remove the
airbox?  I really don't want to have to take off the IM again.

-Andrew

On 6/9/05, Brandon Rogers <brogers at terrix.com> wrote:
> I'm curious about this downpipe, too.
> 
> Brandon
> 
> ----- Original Message -----
> From: "Andrew B" <andrew.sb at gmail.com>
> To: "spot.ontheroad" <spot.ontheroad at virgin.net>; <urq at audifans.com>
> Sent: Wednesday, June 08, 2005 4:06 PM
> Subject: Re: [urq] Hot Start/Thermal wrap
> 
> 
> Sounds good.  I have an upgraded downpipe, btw, I'm not sure who made
> it, but it's single tube instead of the (?) twin tube stock pipe.  I
> should be able to wrap enough of it to significantly cool the area
> near the starter.  I can't get all the way up to the turbo, but we'll
> see if I can work something out this evening.  It'll be pretty hot in
> that area regardless of whether the downpipe is wrapped (turbo,
> exhaust manifold).
> 
> I do have two heat shields on the starter right now.  One is wrapped
> tightly, the other is a little more loose.  They are aluminum with a
> fiberglass backing.  Maybe I'll pick up some ducting or something to
> try and rig another shield off the downpipe.
> 
> If this doesn't fix it I'll start working on the starter.  Thanks for
> the input, all.
> 
> -Andrew
> 
> On 6/8/05, spot.ontheroad <spot.ontheroad at virgin.net> wrote:
> > Andrew
> >
> > I have done the following to my car and never have hot start problems:
> >
> > Wrapped the starter in heat reflective wrap similar to standard.
> > Fitted an aluminium heat shield around the starter.
> > Removed my downpipe completely and wrapped it top to bottom with thermal
> > bandage.
> > Removed the auxillary radiator and raplced my rad with one from a coupe
> > quattro but had it rebuilt with a 5-row core (standard is 2-row)
> >
> > The thermal bandage takes heat away from the engine bay area, the removal
> > of
> > the auxillary rad allows more ari in to the turbo/inlet manifold area and
> > helps keep things cooler. I have no problems with over heating or getting
> > hot. The temp gauge is always mid-way between cold and normal. I would not
> > have removed it without increasing the efficiency of the main rad though.
> > To
> > do this you will need the hoses and thermostat housing from the coupe or
> > coupe quattro set up.
> > Also make sure the injector cooling fan cuts in when it is supposed to.
> > This
> > happens very rarely nowadays.
> >
> > It is worth removing the downpipe fully and doing the job properly. I
> > tried
> > to remove it from underneath, After lots of cut knuckles and bad language
> > I
> > removed everything in that side of the engine and did it properly. With
> > all
> > that out it is worth making a new heatshield for your LHS engine mount if
> > the old one is tatty. I made one from SS.
> > Hope this helps.
> >
> > All the best
> >
> > Keith
> >
> > '87 WR
> >
> > ----- Original Message -----
> > From: "Andrew B" <andrew.sb at gmail.com>
> > To: <urq at audifans.com>
> > Sent: Wednesday, June 08, 2005 3:47 AM
> > Subject: [urq] Hot Start/Thermal wrap
> >
> >
> > Just removed my downpipe...well, as much as I can with everything
> > still in the car.  I'm having fairly regular hot start problems.  When
> > it's hot outside, and I drive hard or in stop and go, the car won't
> > turn over.  With a jump, it starts fine.  Thanks to somebody's
> > suggestion, I'm assuming that it's the starter absorbing heat...so I
> > figured I would wrap the exhaust with one of those thermal wraps to
> > help keep temperatures down, and maybe vent the hood, but that's way
> > off in the future.
> >
> > Anyways, I can't quite get the DP all the way out of the car.  Being
> > that it was night, I was alone, and I don't really know what I'm
> > doing, I left it halfway out.  Should I wrap it as far as I can?
> > It'll cover the portion nearest the starter, but not all the way up to
> > the turbo.  Should I continue to try and remove the pipe so that I can
> > wrap the whole thing?  Will it matter?  Will it work?
> >
> > Thanks in advance,
> > -Andrew
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