No it's not! It's not the horsepower you have to worry about, it's the torque. I would say anything over 450 wtq you should start upgrading your internals.
I would certainly not recommend to anyone disregarding internals until they hit 450
wtq on the EA888.3! I think you meant torque at the crank not the wheels. I do agree with you that torque is important, but I think both HP and TQ are, otherwise we could just limit peak torque and run crazy amounts of HP on the stock bloc.
That being said, most European-based tuners this side of the pond do recommend to upgrade internals after exceeding the 500bhp mark on the MK7 and this has been the best practice adopted by the tuning community in my whereabouts. It may be partly due to the fact that at 500+bhp, unless you force a limit on the torque, you hit the whereabouts of 450TQ anyway.
Bear also in mind that tuners will adapt to the specific driving style and conditions of their customer-base, and issue their recommendations accordingly. For ex; tuning in Germany must take into account red-lining the engine for prolonged periods of time in 6th or 7th gear on the autobahn (where HP related thermal stress, and not TQ, is an issue). Tuning in the US will likely take into account a very different driving style and conditions.
Thanks for the input...both of you. I will definitely keep a look out for more on this so to protect my upcoming purchase. I agree, torque is the more likely damaging factor...but early in the revs. However, HP can be fatal as well if near redline for long on weak internals. Would likely want to search for threads on this and see if the details of when it blew so to get an idea when most failures occurred and with what level of torque and power.
Exactly. There are multiple ways and scenarios for rods, bearings and pistons to fail. TQ and/or HP will each play its role.
We have seen engine failures occur sometimes at peak torque range, but most of the times this happened at peak power range (where torque is way below 450lbft).
I do believe that turbo failures and clutch slip on the other hand occur on peak TQ.