Surge Issue Question

[Idealsupra]

Hey i was wondering if there have been any surge issues "reported" by anyone...inparticularly with a t66 or similar size turbo with a small AR turbine housing such as a .58 or .70

my friend is gonna run a T66 and id like to see it with a .58 housing for quickest spool because even with that housing it will still make the power he wants on pump gas. but i have read that some of the mk4 guys has surge issues with that small of a housing and even the .70 and they recommend the .81

thanks!

 

[tubbie]

Surge occurs when either the turbo is producing too much boost and it cannot hold the boost, so the boosted air inside the intercooler pipes leak back out past the compressor, OR your boosting such little boost for such a big turbo that the turbo compressor is not compressing enough air to create boost, so you get surge. I think.... :biglaugh:

 

[itr206]

Yea I think there is more to it then that. My friend runs a 61mm with a 58 hot side on his MKIV and doesnt surge at least at 24psi