Another one bite's the dust 850R again.
MikeYours looks like the engine of the U.S. Air flight that sucked in that chicken and crashed. Put an air filter on it and stick to paved roads.
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From: Eugene, Oregon
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From: Eugene, Oregon
I want to keep my a/c and I don't want to deal with the lag I like the quick spool and I'm a stroker so to jump on a 42r set up and better I would have to rebuild my motor for a higher reving to spool that baby up top.
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From: Augusta, Georgia
I like how the op is looking for an object in the intake for the destruction. First off it would not take much at that kind of rpm to destroy the compressor blade like yours. I am not talking about engine rpm I am talking about the turbo. What kind of rpm do you think its seeing at 40 + lbs of boost... It would be retarded to think if something was sucked in that you would see any reminisce of it.
Also I completely agree this turbo is made for 1/4 mile pulls. Not long 5th gear pulls. Also if you are going to drive like that please keep if off the streets. Thats just retarded. That kind of driving is beyond street racing...
Also I completely agree this turbo is made for 1/4 mile pulls. Not long 5th gear pulls. Also if you are going to drive like that please keep if off the streets. Thats just retarded. That kind of driving is beyond street racing...
Last edited by DWs95AWD; Feb 16, 2009 at 09:04 PM.
Let me put it in a nutshell.
Turbos are designed to operate within a certain RPM window. You overspeed when you go too far to the right on the map, you surge it going to far to the left.
42-44psi on a 62mm turbo makes somewhat over 720 wheel hp, and 599ft lb torque on c16 on this car.
Here is the part that you guys are not understanding, this is not a 1/4 mile car. 44psi down the 1/4 mile is fine, it will take that all day.
The owner is going on the highway, with c16, 44psi, going up to 150MPH, then he hits it full blast from there and doesn't stop until the speedo is pointing vertically down to the ground. A 996 Porshe was trailing him the last time, and the porsche was at 185 MPH, and he was pulling away 20 cars infront of the Porsche.
Some of you guys won't get it (I didn't understand how he was doing this till he sat down and explained to me what he did in detail). This is what is happening, turbo is overspeeding for too long and it hits the housing, then the little pieces off the edge get sucked in. He needs a bigger turbo for that type of use, it cannot tolerate that type of use, IMHO.
Now for you 1/4 mile guys that just hold it for 10 sec carry on, this will not happen, the turbo will hold up fine for that, I don't have any other customers with this issue.
Last time I pulled the filter off myself I saw what the turbo looked like the only thing it has injested are edges of the blades.
Not an AMS issue, not a tuning issue, simply a design and intended usage issue.
They last for a while like this, then one day it fails during a run.
Sean
Turbos are designed to operate within a certain RPM window. You overspeed when you go too far to the right on the map, you surge it going to far to the left.
42-44psi on a 62mm turbo makes somewhat over 720 wheel hp, and 599ft lb torque on c16 on this car.
Here is the part that you guys are not understanding, this is not a 1/4 mile car. 44psi down the 1/4 mile is fine, it will take that all day.
The owner is going on the highway, with c16, 44psi, going up to 150MPH, then he hits it full blast from there and doesn't stop until the speedo is pointing vertically down to the ground. A 996 Porshe was trailing him the last time, and the porsche was at 185 MPH, and he was pulling away 20 cars infront of the Porsche.
Some of you guys won't get it (I didn't understand how he was doing this till he sat down and explained to me what he did in detail). This is what is happening, turbo is overspeeding for too long and it hits the housing, then the little pieces off the edge get sucked in. He needs a bigger turbo for that type of use, it cannot tolerate that type of use, IMHO.
Now for you 1/4 mile guys that just hold it for 10 sec carry on, this will not happen, the turbo will hold up fine for that, I don't have any other customers with this issue.
Last time I pulled the filter off myself I saw what the turbo looked like the only thing it has injested are edges of the blades.
Not an AMS issue, not a tuning issue, simply a design and intended usage issue.
They last for a while like this, then one day it fails during a run.
Sean
A turbo rpm gauge is often helpful to pinpoint over spinning problems
I have seen on my comprssor wheels the edges of the fins bending in at the leading edge from this kind of over boosting and also my turbine wheels have literally had the edges spin off from spinning too fast
It seems if the customer wants to make 750 whp and run ion 5th gear for sustained periods a larger compressor wheel is needed to flow enough air and sustain a turbo rpm which is more within tolerance
I would add that I have several customers with the PT 62/62 and 62/82 who have been running 44 psi for quite some time with no problems - BUT - I don't think they run the car sustained at peak boost for long durantions in top gear
I know Sharkbite well and he is a guy who will try and run 200 mph if he can
Al
You would be surpized - the Gt42 70mm unit with the small turbine hosuing and a Shearer twin scroll spools up the same as your previous Gt37 - its actually a very pleasnt street turbo and wont fly apart
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From: Eugene, Oregon
With the blades getting rammed into the housing like that I'd say the compressor got too hot and expanded. There is only a few thousands clearance so it doesn't take a lot of growth from thermal expansion to get into trouble.
What material is the compressor wheel made from on the 850R?
What material is the compressor wheel made from on the 850R?