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Message: <blockquote data-quote="f8." data-source="post: 95117" data-attributes="member: 541">i think high boost in itself is not the cause of ceramic turbine failing, it is high boost and high air flow which occurs at high rpm.say at 2bar for a 2L engine, this compressor can support the air flow at 3000rpm at this boost for this engine size, if you try to hold the same 2bar on this engine at 6000rpm, in the simple case you are doubling the air flow already. to keep up with the air demand of the engine at 2bar 6krpm, the turbo will need to spin faster to keep up. this is over-revving of the turbo, and as rotational speed goes up, the centrifugal stress os the blades rise until they let go, thus the story of ceramic turbo's losing their fins.sometimes i talk to a wall in zth because no one seems to bother taking the time to even try to understand what i have taken the time to try to explain. i wonder why i even bother in the first place. as you can see from the original poster's response after this post, he hasn't got the slightest clue what i'm saying here. i might as well be speaking timbuktuan. moijkotozu zambata kon. turbo jeriwa engeok. perhaps those wanker lights will help. *shrug* help me, help you. help me, help you. help me, help you....i would say, high boost is fine as long as its in mid rpm but you taper your boost off judiciously at high rpm's. to a limit any turbo can support whatever the torque you want more easily through boost, but it can only flow enough air for a certain hp that the compressor was designed for. high torque at low rpm is not necessarily high hp, but even medium torque at very high rpm is very high hp. and this, if you demand of the turbo, will mean over-revving. even steel turbo's will fail like this sooner or later. in other words, use the turbo as a constant power item, so have as high a torque(boost) you want at low rpm and lower it at high rpm as long as you don't exceed the hp rating.on the other hand, also be careful how fast you allow high boost to build up. if the engine is not yet consuming enough air flow for that high a boost(say at a lowish rpm) then you will get compressor surge, which will kill the turbo too. in most cases, we don't operate anywhere near the danger regions so it is fine, but when you start pushing things you need to be careful.</blockquote>

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