Turbo woes..
Turbine needs to be cleaned to see if it actually got over heated. My turbine had bluing due to heat and did not fail. The turbine is likely broken from hitting the housing, not heat.
Did it fail on the 1st autox run of the day? I suspect it may have been damaged prior to starting the day. I cannot imagine a few autox runs generating enough heat to do that kind of damage.
Thread Starter
Joined: Mar 2006
Posts: 13,632
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From: Fresno, CA
If so, that's one expensive ****ing air filter LOL
Better at a local event than a road course 3+ hours away
Thread Starter
Joined: Mar 2006
Posts: 13,632
Likes: 824
From: Fresno, CA
I just bought an 8.5 turbo. If it's in decent shape, I'll toss it onto the car real quick so I can drive it on weekends.
If not, I'll save the turbine housing and build another HTA71 later.
I will now have not one... not two.. but three VIII CHRAs cluttering up my garage
If not, I'll save the turbine housing and build another HTA71 later.
I will now have not one... not two.. but three VIII CHRAs cluttering up my garage
B
Thread Starter
Joined: Mar 2006
Posts: 13,632
Likes: 824
From: Fresno, CA
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Joined: Mar 2013
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From: in a garage
It's probably due to your stock BOV which opens and leaks at a pressure lower than your WG pressure (26 or 27 PSI).
That means that you get up to that boost pressure, the BOV leaks and limits the boost, your WG won't open, the leaking BOV makes the turbo overspeed, then because the WG won't open, it runs extra hot due to flowing all the exhaust instead of just some of it.
Real easy?
Leaking factory BOV....Bad
Modified factory BOV..........easy and free and no leaks.
That means that you get up to that boost pressure, the BOV leaks and limits the boost, your WG won't open, the leaking BOV makes the turbo overspeed, then because the WG won't open, it runs extra hot due to flowing all the exhaust instead of just some of it.
Real easy?
Leaking factory BOV....Bad
Modified factory BOV..........easy and free and no leaks.
Last edited by RightSaid fred; Aug 23, 2017 at 11:48 PM.
Thread Starter
Joined: Mar 2006
Posts: 13,632
Likes: 824
From: Fresno, CA
It's probably due to your stock BOV which opens and leaks at a pressure lower than your WG pressure (26 or 27 PSI).
That means that you get up to that boost pressure, the BOV leaks and limits the boost, your WG won't open, the leaking BOV makes the turbo overspeed, then because the WG won't open, it runs extra hot due to flowing all the exhaust instead of just some of it.
Real easy?
Leaking factory BOV....Bad
Modified factory BOV..........easy and free and no leaks.
That means that you get up to that boost pressure, the BOV leaks and limits the boost, your WG won't open, the leaking BOV makes the turbo overspeed, then because the WG won't open, it runs extra hot due to flowing all the exhaust instead of just some of it.
Real easy?
Leaking factory BOV....Bad
Modified factory BOV..........easy and free and no leaks.
You haven't mentioned your BOV?
The easiest way to kill a turbo is to have the spring on the BOV too tight so it doesn't vent properly.
Given enough time and going from full throttle to no throttle enough times, it'll surge and kill the bearings, ending up like your photo.
High EGTs will kill the engine before the turbo.
The easiest way to kill a turbo is to have the spring on the BOV too tight so it doesn't vent properly.
Given enough time and going from full throttle to no throttle enough times, it'll surge and kill the bearings, ending up like your photo.
High EGTs will kill the engine before the turbo.
Dang man, sorry to hear about the bad luck. My 8.5 turbo in 55*weather I was able to make around 385hp ish. It was a lot of fun, in the summer heat my HTA71 wasn't even making that. Personally I think i would like the bb green for a little more top end.