Damaged Exhaust wheel, What Cause This?
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From: Sutherlin OR
Damaged Exhaust wheel, What Cause This? Damaged Exhaust wheel, What Cause This?
This is off my STS T60-1 turbo. I bought this kit used with about 1100 miles on the brand new turbo from Jason at TSP. He also sent me the tune. I've only put another 1500 miles on it since then. I pulled my turbo to change the housing to a .69 A/R exhaust housing to try to get a little more boost down low with the small 4.8 motor in my truck. But it turns out the .69A/r I got is apparently for an O trim and not a P trim wheel, so it wouldn't work. When I pulled the housing, I found this. I know the pic is a little fuzzy, but you can still see the damage. The turbo is still working ok and builds boost. I'm only running it at 7 lbs and according to my wide band I got the other day it is running really rich at WOT 9.8-1 AF, so it shouldn't have burned it off from running lean. Any ideas??
This is off my STS T60-1 turbo. I bought this kit used with about 1100 miles on the brand new turbo from Jason at TSP. He also sent me the tune. I've only put another 1500 miles on it since then. I pulled my turbo to change the housing to a .69 A/R exhaust housing to try to get a little more boost down low with the small 4.8 motor in my truck. But it turns out the .69A/r I got is apparently for an O trim and not a P trim wheel, so it wouldn't work. When I pulled the housing, I found this. I know the pic is a little fuzzy, but you can still see the damage. The turbo is still working ok and builds boost. I'm only running it at 7 lbs and according to my wide band I got the other day it is running really rich at WOT 9.8-1 AF, so it shouldn't have burned it off from running lean. Any ideas??
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From: Sutherlin OR
My plugs all look fine, they where new TR6's when I put the turbo on. Must have been that way when I got it, guess I'm have to give Jason a call.
Edit: yes I still have factory, unmodified cats. The truck only has 30,000 miles on it.
Edit: yes I still have factory, unmodified cats. The truck only has 30,000 miles on it.
Originally Posted by kbracing96
My plugs all look fine, they where new TR6's when I put the turbo on. Must have been that way when I got it, guess I'm have to give Jason a call.
Edit: yes I still have factory, unmodified cats. The truck only has 30,000 miles on it.
Edit: yes I still have factory, unmodified cats. The truck only has 30,000 miles on it.
With a ultra rich 9.8 A/F you may have caused the cats to go bad and break up.
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From: Sutherlin OR
On another note, what do you guys think about since I have to get a new wheel anyway, to go a head and get the O trim wheel and run the smaller wheel with the .69 A/R housing? Would it be too small for a stock 4.8? Right now I don't build full boost from a standing start till 4000 if I don't brake stall it.
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From: Sutherlin OR
Originally Posted by Avengeance
I have a funny feeling your cats are burning up and steadily sending tiny pieces into the turbo. This has actually been brought up as a STS concern a couple times.
With a ultra rich 9.8 A/F you may have caused the cats to go bad and break up.
With a ultra rich 9.8 A/F you may have caused the cats to go bad and break up.
Originally Posted by kbracing96
I wouldn't think being to rich would do that to the cats, maybe if it was too lean and had excessive high exhaust temp, I could see that.
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From: Sutherlin OR
Originally Posted by Avengeance
Cats are designed to reburn unused fuel thats coming out of the motor.. it "catches" unburnt fuel and tries to reburn it to keep emissions clean. When theres too much fuel coming out of the motor you can saturate the cat and cause it to go bad by overheating it, then it becomes brittle and start to break apart.
I know Jason said he ran this thing pretty hard, 15+ psi on a 4.8 with a stock fuel system and a ton of meth. I've got a good fuel system, intercooler and am only running 7 psi and 18* of timing under boost.
