great white
Well-Known Member
Looking for turbine doc or someone similar to chime in here:
So, the ATT is apparently the choice of upgrade/replacement.
I've read a bit here and there about the stock GM-X turbo's and vague references to what's the problem with them.
The most "popular" issue seems to be around 10-15 PSI they become a restriction in the exhaust flow.
Why is this?
Wastegate design?
Turbine design?
housing design?
Sizing?
Inquiring minds want to know....
Is it a result of the "quick spool" characteristics of the IHI design?
Personally, it'll be a long time before I go over stock HP or turbo pressures. Probably never enough to warrant a replacement for the sake of replacement, but I may dial it up a couple PSI from time to time.
I spend most of my time in "off idle" situations, so low end "snap" is more of a concern for me than winding the P out of it....
Here's another question:
I've seen it written here the -8 turbo is "better" than the -4, etc. What makes it "better"?
So, the ATT is apparently the choice of upgrade/replacement.
I've read a bit here and there about the stock GM-X turbo's and vague references to what's the problem with them.
The most "popular" issue seems to be around 10-15 PSI they become a restriction in the exhaust flow.
Why is this?
Wastegate design?
Turbine design?
housing design?
Sizing?
Inquiring minds want to know....
Is it a result of the "quick spool" characteristics of the IHI design?
Personally, it'll be a long time before I go over stock HP or turbo pressures. Probably never enough to warrant a replacement for the sake of replacement, but I may dial it up a couple PSI from time to time.
I spend most of my time in "off idle" situations, so low end "snap" is more of a concern for me than winding the P out of it....
Here's another question:
I've seen it written here the -8 turbo is "better" than the -4, etc. What makes it "better"?
Last edited: