by sparco » Thu Dec 11, 2014 3:14 am
Questions like these are hard to answer and bring a lot of bullsh*t to the table...
its pretty much all hear say and guesses.
not all GT17xxV are created equal for one...
It depends on a lot of factors, what version and construction, age, how its mapped, etc...
its not high boost that kills it, rather high egt, high emp, choke, surge, overspeed, spikes and bad maintenance...
on my brothers passat 1.9PD130 (awx) we've been running 1.65bar boost for moths now and still no adverse effects noticeable.
that is a gt1749va btw, the gt1749vb has a bigger shaft and will manage with a bit more abuse.
my small td025 on my 1.6hdi has been spiking +1.5bar for many years and runs 1.4bar stable, tho everyone said not to go over 1.25bar or it would explode...
unless you are willing to do just that, stick to what you think is safe.
I've blown up a gt1544v before, running just over 1.65bar, testing the limits...
Darkvador, you are right, boost in itself will not produce power, the increase in mass airflow will ;)