180 gains we see 85% come in with blown head gaskets and broken pistonsHere is one I did on e85 in 2019. E85 was 180 hp over stock and 80 over 93 tune. I did his brothers Expedition with the exact same mods even down to the brand and picked up over 200 wheel horsepower thanks to the extra half a point of compression the none ho has.
Now in terms of longevity those 2 levels are pretty sustainable again as long as the torque is well-managed and a whole host of variables. For example if your guys's oil is even a little tiny but under full when you launch you are going to see an oil pressure drop and that oil pressure drop is going to kill your bearings and the lower you are at oil the longer that oil pressure drop is going to last for in terms of first gear and second gear and sometimes into third gear and then it's all over [emoji38]. A good side note is pretty much all of my fast F150 guys and even Explorer St guys are running a half quart over full. Totally different discussion I'm getting sidetracked.
Either way 180-200 hp over stock on stock turbos is where you need to stop sometimes less depending on other factors. What normally starts to happen if you try to push Beyond it and you can push Beyond it because there is still turbo left but what's going to happen is you're going to start seeing head gasket failures (or worse) from excessive back pressure. In my opinion if you keeping the peak torque the same you are safer making 550 hp on stage 4s then you are making 530 on stock turbos.
That being said you aren't going increase power by 200 hp and still get 200,000 miles out of of a motor. You decreasing the longevity of your motor and increasing the chance of a catastrophic event. By how much really depends. And it also depends on how well you take care of it if you're running 6 7000 miles on an oil change and using crappy oil well you know what's going to happen.
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Factual and if you haven’t seen it because tearing them down is not your thing as 6-10 are done weekly
Highly suggest never pushing 575 hp or close to 600. 98 percent of trans are smoked once removed the converter it shows the story
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