Jumping in late here as we have been absent from the forum for a bit. The tuner and fuel are going to be your most important factors, a good tuner and tune coupled with good fuel will do you well. Running a custom UM Flex Fuel tune, and pump E85. We have been pushing 450WTQ, and 500ISHWHP on our stock motor GTI for about 12K miles now. This includes at least 12 trips to the drag strip with getting close to 100 passes, a full day at Thunderhill road course where the GTI put down a lap 1 sec faster than out shop F80 BMW M3 and did on tires that cost $45 each, it also did a full day at a 1/2 mile event which is prob the hardest on the motor, full load all the way up to the top of 5th or 160MPH. We also have lent the car to 3 customers, and let multiple employees take it home. No one was easy on it. This car has never once let us down, and we plan to take it back to the strip next week. Running a big turbo at high power levels is totally doable for extended periods of time, just use good fuel, and a good tuner!
Thank you Sir! great explanation on what the car has been through, Kind of the answers i was looking for. Not because it is holding at those power levels but ir shows e how the car has been treated especially the lent to customers part. (When all know they ragged on that boy. This thread isnt related to this topic ,but i had a few questions on fueling, mpi from PR is the fueling im going with and their fuel lines. But my biggest issue is lpfp. Vendor told me to go walbro 525 for my "500whp 400torq* goal.but a walbro 450 is more then enough pressure.though i hear thr issue is pushing the 450(for full e85) is the stock controlling module. Id rather not buy a external fuel pump controller so dont know what to do in the sense why go walbro 525 when this car will never see close to the max pressure(or if i get 525 i wont need external fuel controller) Cant i just run a relay on the 450 to have have it running 100percent at required voltage all the time ? Btw thanks in adavanced.