csa Posted July 3, 2008 Share Posted July 3, 2008 I've just removed my GT4088 to replace it with a T67 I had it off some weeks ago, and it had the "correct black color" from exhaust gasses. However, take a look at this: http://img61.imageshack.us/img61/6558/dsc00109du9.jpg as you can see the wheel is light brown, and so it the inside of the manifold. aditionnally to the brown color, it had some moist on it, seemd to be water. very little but it was there. I've pulled a sparkplug out to check it, but it looked fine: http://img61.imageshack.us/img61/1897/dsc00108mn8.jpg But there's more to the mistery: Yesterday when I drove the car, the boost varied from 1.2 bar(what it should be) and all the way up to 1.6 bar, sometimes only 1.4 bar. Also it seemd to come awfully late on full boost (5k rpm+) Air/fuel all looked nomal though whats wrong here!? Quote Link to comment Share on other sites More sharing options...
b_have Posted July 3, 2008 Share Posted July 3, 2008 The turbine wheel is finished. Quote Link to comment Share on other sites More sharing options...
Wez Posted July 3, 2008 Share Posted July 3, 2008 Looks like another 4088 thats fallen to heat issues Truck turbo anyone. Quote Link to comment Share on other sites More sharing options...
JamieP Posted July 3, 2008 Share Posted July 3, 2008 Looks like rust or the start of it? may be due to to the vent to atmo breather system, have you been using it much? Quote Link to comment Share on other sites More sharing options...
csa Posted July 3, 2008 Author Share Posted July 3, 2008 yes yes I know the turbo itself is finished, thats why I'm replacing it, but it surely can't be whats causing the color og the strange boost behavior? Quote Link to comment Share on other sites More sharing options...
csa Posted July 3, 2008 Author Share Posted July 3, 2008 Looks like rust or the start of it? may be due to to the vent to atmo breather system, have you been using it much? it's been sitting in the garage from june 8th till end of june, then i've driven small 1 hour splashes, but then I drove it for 3 full hours yesterday Quote Link to comment Share on other sites More sharing options...
SimonB Posted July 3, 2008 Share Posted July 3, 2008 Do you mean the boost behaviour is strange using that 4088? If so I'm not suprised considering the chunks missing from the exhaust wheel! Or do you mean with the T67? Has it been remapped since changing? Quote Link to comment Share on other sites More sharing options...
csa Posted July 3, 2008 Author Share Posted July 3, 2008 with the gt4088. it's been running fine with the wheel in that condition for more than a month, when it boost 1.4 bar it stays there, likewise with 1.6. it's not jumping up and down once on-boost Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 3, 2008 Share Posted July 3, 2008 Turbo mice again, looks like i have this to look forward to, the odd thing about these failures is that according to Garrett the exhaust turbine is the same material as all the others. Quote Link to comment Share on other sites More sharing options...
gaz1 Posted July 4, 2008 Share Posted July 4, 2008 what manifold are you using? Quote Link to comment Share on other sites More sharing options...
AlanM Posted July 4, 2008 Share Posted July 4, 2008 Is this not a form of cavitation, the erosion of the trailing edge? Quote Link to comment Share on other sites More sharing options...
SteveR Posted July 4, 2008 Share Posted July 4, 2008 I'm keeping the boost on mine turned down, it can only be a matter of time 'till my GT40 goes pop? Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 4, 2008 Share Posted July 4, 2008 You know when a turbo wheels gets like that it's completely unbalanced, so when it spins up it'll oscillate and oval out the turbo seal, letting oil out into the exhaust. Your oil temps will go up, the level will drop due to it being burnt, and it'll get contaminated as well. So driving with a fubar turbo like that isn't a good idea for the longevity of the engine itself... -Ian Quote Link to comment Share on other sites More sharing options...
csa Posted July 4, 2008 Author Share Posted July 4, 2008 what manifold are you using? a greddy Quote Link to comment Share on other sites More sharing options...
csa Posted July 4, 2008 Author Share Posted July 4, 2008 You know when a turbo wheels gets like that it's completely unbalanced, so when it spins up it'll oscillate and oval out the turbo seal, letting oil out into the exhaust. Your oil temps will go up, the level will drop due to it being burnt, and it'll get contaminated as well. So driving with a fubar turbo like that isn't a good idea for the longevity of the engine itself... -Ian wouldn't that visible smokewise from the exhaust? ...still no suggestions to the brown color? Quote Link to comment Share on other sites More sharing options...
bignum Posted July 4, 2008 Share Posted July 4, 2008 What if an exhaust wheel was white? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 4, 2008 Share Posted July 4, 2008 I would say that brown is a pretty good post combustion colour, if it was white then i would expect the turbine erosion. Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 4, 2008 Share Posted July 4, 2008 wouldn't that visible smokewise from the exhaust? Yes You'd know if it was happening ...still no suggestions to the brown color? Burnt oil? -Ian Quote Link to comment Share on other sites More sharing options...
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