stt Posted November 21, 2004 Share Posted November 21, 2004 Originally posted by Gordon F I'd be very interested to know where that figure came from. Maybe I should start saving now Mine went pete tong on 84,000k and i was told that its about average for ceramic turbos to give up after that sort of mileage,I just guessing from what a few people have said that im just unlucky to of had them go pop when they did Link to comment Share on other sites More sharing options...
Aerotop Dave Posted November 21, 2004 Share Posted November 21, 2004 Ah well, I'm decatting in the Spring and let's see how far we get. Eyefi was running it decatted anyway so the turbos have just had a rest for a few 1000k's really Although I so rarely use the second turbo it's not exactly a typical 'life of turbos' experiment, hehe Link to comment Share on other sites More sharing options...
Jake Posted November 21, 2004 Share Posted November 21, 2004 Originally posted by stt Mine went pete tong on 84,000k and i was told that its about average for ceramic turbos to give up Told by whom? 84,000 kilometers is only about 52,000 miles. That's way to early for the turbos to fail. Link to comment Share on other sites More sharing options...
Adam Kindness Posted November 21, 2004 Share Posted November 21, 2004 i blew the exhaust wheel off No1, and damaged a few pistons running 1.2bar (with boost spikes) car had done 37k miles at the point but i think all this talk of what boost can a std j-spec turbo setup take..... i'd rather have enough fueling to run the boost safely before worrying about a turbo 18psi.... 1.2bar max Link to comment Share on other sites More sharing options...
Steve W2 Posted November 22, 2004 Share Posted November 22, 2004 Originally posted by stt Mine went pete tong on 84,000k and i was told that its about average for ceramic turbos to give up after that sort of mileage,I just guessing from what a few people have said that im just unlucky to of had them go pop when they did I would be more inclined to listen to people with specific and extensive Supra related experience. Otherwise you will get misinformed. It doesn't sound like the guy you were talking to knows about these cars specifically;) Just IMHO. Link to comment Share on other sites More sharing options...
Guest emicen Posted November 22, 2004 Share Posted November 22, 2004 Originally posted by emicen To actually say this is worthless speculation is not valid, however, from an engineers point of view, I'd take this kind of data - age, spec of turbos, mileage, boost-life and stick it in a huge excel sheet and look for a trend. Why do I say huge, because I'd be interested in at least 100 pieces of data at the very minimum before I started speculating on trends or making assumptions about boost limits for safe use etc. What might be more interesting for potential owners or the peace of mind of current owners would be, when they went how much did they take with them?! Seals or impellor failure leading to total rebuild? Take the system and identify the variables: Age (divide in to categories of 3 years = 4 categories) Boost Pressure (divide in to 3 categories, standard, +few psi, + lots of PSI) Turbine Material (2 categories, metal or ceramic) So you're looking at about 24 different combinations of configuration. When running tests I always run 4 sets of data to check for erroneous figures or trends that dont fit with the others. 24 x 4 = near enough 100 sets. With that much data, I'd be happy to predict trends that may be likely to cause failure. The more data the better. Link to comment Share on other sites More sharing options...
Steve W2 Posted November 23, 2004 Share Posted November 23, 2004 Originally posted by emicen Take the system and identify the variables: Age (divide in to categories of 3 years = 4 categories) Boost Pressure (divide in to 3 categories, standard, +few psi, + lots of PSI) Turbine Material (2 categories, metal or ceramic) So you're looking at about 24 different combinations of configuration. When running tests I always run 4 sets of data to check for erroneous figures or trends that dont fit with the others. 24 x 4 = near enough 100 sets. With that much data, I'd be happy to predict trends that may be likely to cause failure. The more data the better. Is it just me or does the above not make much sense? You would only be testing 4 examples of each different variation. So you would have 4 examples of 1993 ceramic tubos running standard pressures, no? If so how will this eliminate erroneous figures? You are only testing 4 like-for-like examples, this won't give you a true representation of whats happening. All you will have is very limited data (4 sets) on 24 different categories. And where does mileage come in to you calculations? Or are you assuming that they are all age related? If you are using assumptions as large as this then the tests would be far too inaccurate to bother anyway. Not trying to have a go at you mate, I just don't think I agree (?)with what you are saying:) Link to comment Share on other sites More sharing options...
Steve W2 Posted November 23, 2004 Share Posted November 23, 2004 I think the overriding point to all of this is 'when they go, they go'. They are like any other mechanical component of the car and will last a slong if treated properly. The conditions under which they have been used, the amount of use, and the condition of other key components like the intercooler will have a significant effect on their life. You should expect however, that when running higher than stock boost levels that your turbo's will give up earlier than normal due to addditional stesses involved. You will just have to factor the different points in when purchasing a car and go from there. Link to comment Share on other sites More sharing options...
Aerotop Dave Posted November 23, 2004 Share Posted November 23, 2004 The other factor of course is how much you actually use them, not the mileage as such. My journeys are mainly tootles between 30 and 50, so my second turbo only occasionally gets used. It would be very easy for me to rack up loads of miles without using the turbos - I was low on fuel the other day and managed to do my entire journey into work and back again without going above 2000rpm I've no idea how you would be able to catalogue this sort of thing. Someone might say 'Mine blew at 80,000 miles after hard use', but it's subjective. One person's hard use is another person's gentle trundle. 'tootles' and 'trundle' - we should use these words more on the forum Link to comment Share on other sites More sharing options...
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