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Offline djs

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Hot Turbo
« on: June 28, 2010, 02:23:36 PM »
I have a question for my fellow Audi brothers (and sisters...if we have any)

Last week I was experiencing some issues with the car.  I first noticed some light shuttering under load on the highway.  Later that day I was getting the stutter at idle as well and the CEL lit up.  Bad Coilpack right?  I didn't drive it after that day and swapped out the coilpack last night.  I took it for a test drive last night.  It was proably 10-15 minutes long and I'll admit I gave it the beans a bit....kept it in low gears, pulled pretty hard, kept the RPMs high to make sure I had solved the problem.  Good news is I had no stutter at all under load or at idle.  Woohoo.

However, when I got home and popped the hood I noticed how hot the Turbo was...to the point I was getting the orange glow.  I know that our turbos get hot and will glow, I just thought it took longer than 10-15 minutes of semi-hard driving to get them there.  Some things you should know...it was hot, like 93 degrees or so when I went out, and I hadn't cleared the CEL and codes yet, so perhaps the ECU was still adjusting based on the engine codes. 

I spent some time on AZ last night searching, didn't find anything specific but got to wondering if I might have a bad CAT.  The CAT however wasn't glowing, just the Turbo.

Thoughts?

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Offline ken

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Re: Hot Turbo
« Reply #1 on: June 28, 2010, 03:11:09 PM »
It really doesn't take much to get the tubo to glow a bit to where you can see it.     
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Offline jm

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Re: Hot Turbo
« Reply #2 on: June 28, 2010, 04:47:41 PM »
The heat capacity of a K03 has to be abysmal.  Couple that with EGT's over 1000F and you're turbo can probably heat up to 'glow' temperatures on a hot summer day with a solid minute of good boost.
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Offline djs

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Re: Hot Turbo
« Reply #3 on: June 28, 2010, 04:52:46 PM »
Thanks for the replies guys.  This makes me feel a little better.  I was really worried that I'd have to replace a CAT.  I may still run it by Autozone to have the codes scanned to see if there is anything going on under the surface that isn't readily noticeable.
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2005 Arctic White S4 - Bone Stock (for now)
2002 Brilliant Black A4 1.8T: APR Stage 1; 18" RS6, OEM sport suspension; S4 sways; painted lowers, S4 door blades, S4 matte mirrors, Icelink, Cleared Corners, 710n DV

Offline Castle

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Re: Hot Turbo
« Reply #4 on: June 28, 2010, 04:57:50 PM »
If it worries you too much just pull over every once in a while and douse it with ice cold water.  :)
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Offline djs

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Re: Hot Turbo
« Reply #5 on: June 29, 2010, 08:42:35 AM »
Nice Castle!  I'll wait until the 4th of July so that the cracking and popping is at least relevant.    ;D
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2007 Brilliant Black A4 Avant 2.0T; 30% tint B-pillar back
2005 Arctic White S4 - Bone Stock (for now)
2002 Brilliant Black A4 1.8T: APR Stage 1; 18" RS6, OEM sport suspension; S4 sways; painted lowers, S4 door blades, S4 matte mirrors, Icelink, Cleared Corners, 710n DV
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