Are 650s too big to run on a 1g at about 15 psi? I know that 15 is about the limit for stock ones, but I have these 650's and kind of want to put them on just for a little protection. Can my SAFCI tune them down enough to be driveable? Oh, and also I have horrible boost creep up to about 18psi and I only have it set at about 11 right now, would an atmosphere dump o2 housing help that much? Thanks.

Mods:
SAFC I
K&N w/ hacked can
3in DP and Catback
Boost & EGT Guages
MBC (not installed now)
255lb pump w/ rewire
dsmchips.com stage2 chip

Originally posted by sd240
Are 650s too big to run on a 1g at about 15 psi?

Nope.

Originally posted by sd240
Can my SAFCI tune them down enough to be driveable?

Yep.

Originally posted by sd240
Oh, and also I have horrible boost creep up to about 18psi and I only have it set at about 11 right now, would an atmosphere dump o2 housing help that much?

Yep.


If you port the wastegate hole, turbine housing, and o2 housing you will get rid of the boost creep.

I Installed a external dump O2 housing, ported my wastegate passage and made a larger flapper, totally cured my boost creep

You really don't even need the external dump. Just port everything properly and you will be fine.

Thank you that's just what I needed to know. I have ported my 02 housing a little bit, but it didn't help a whole lot, just lowered 1 maybe 2 psi. I'm guessing porting the flapper area would help a lot?

Port the flapper hole right to the edge of the flapper without going larger than the diameter of the flapper itself. Also port the inlet of the turbine housing right above the wastegate hole so the air has a smooth entrance to the wastegate.