Cusco 2 Way Diff Readjustment?
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All of that is absolutely true. At any time in the history of these turbos the lottery has always been that it could die at stock boost treated exactly as the factory intended, or it could die when pushed to 10, or 12, or 14, or 16 psi, after a short time, or a longer time, or it could last seemingly forever. You have the combination of all the possible statistical (probably) normal distributions of manufacturing tolerances and quality outcomes, on top of the statistical distributions of failure modes (which might be normal, but are probably biased, like Poisson distributions). You get the lucky turbo and you can beat on it for years. You get the really unlucky turbo and it will crap itself as it rolls out of the factory gate. And every possibility in between. But you can definitely still kill the lucky turbo. It's just that most people didn't try, once they knew they really shouldn't try. -
By joshuaho96 · Posted
Maybe I have Stockholm syndrome but working on an M2 isn't that hard. Getting parts cheaply and quickly is hard, but getting parts same day isn't necessarily hard if you're willing to pay way too much for it at local dealers. There's a lot going on, you need to have a build of ISTA on a laptop and the right cable, if you don't have the mindset of "do it exactly right or not at all" you will probably start seeing cascading failures. Skylines are a little more tolerant in that regard. The car doesn't potentially trash itself if you bought the wrong oil filter like a BMW would. Or trash the entire cylinder head and potentially spin a bearing because someone took the anti-drainback valve out of the plastic oil filter cap. An M2 will also do just fine on track, zero oil starvation concerns, factory brakes are great if you change the pads for a high temp compound + flush with track-ready fluid. -
The "ideal/formula" that used to be touted was death of the turbo is going to be caused by a combination of 3 things. Heat Speed of turbo (boost level you're pushing) Time Basically, you can get away with high heat and high boost for short periods. But start doing long hard pulls, or circuit driving etc, and now you've increased time as well which will shred things. From memory when Adrian was drag racing he was running 17psi, on a stock turbo, and running insane speeds. But he also had other additives helping in the setup too. Some people have success at 14psi for a while, while others due to pushing the cars hard for long periods opt down to lower temps. But also, generate a lot of heat (let's say bad tune), for a long time, and you'll be okay, until you try to spin that little guy up slightly. It's the one advantage of dumping a lot of fuel in, you'll be reducing EGT a bit and helping with the heat portion of the above 3 areas. And these days, stock turbos are that old that there's the possibility of just outright failures due to material age. I'm not shocked that even when used in factory spec that a stock turbo fails when 30 years old. It's a worn out "precision" "balanced" performance item, that's likely no longer precise, or well balanced -
By Dose Pipe Sutututu · Posted
this... hence I said what I said previously, SMSP nights you see mainly Hondas, Evos, A90s, F80x and the odd VW. The 5 or 6 times I went, I only saw 1x R32 GT-R, and other than that I was the only one in a shit box Skyline. -
Yeah, but it's not "boost" that they can take more of. Well, I guess it actually is. They are the same turbine, driving different compressors. I think the failure is more of a turbine temperature and (probably mostly) speed thing. I think the RB25s end up needing the turbine to reach higher speeds in order to drive the compressor to achieve the same boost level. So they will fail at lower boost on a 25 because they've actually reached the same failure speed that they do on a 20 at a higher boost pressure. If that makes sense?
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