I had no problem with stock turbo with boost over 40psi with stock head-block everything.

I am thinking to put a GT3582R... Is it really important to change head studs?
I am planning to run it 32psi with meth injection..
Everything will be stock.. Stock ex manifold too..

 

I would get some L19's and call it a day

 

I was at 25-30psi with no issues on stock head bolts. The only reason I studded it is because I pulled the engine apart and I’d hate to keep buying bolts if I had to open it back up again.

 

I run 31psi on my IX with stock head studs. 40psi seems really high for stock studs regardless if you have a perfect tune with no knock.

 

Considering that 35r at 20psi would throw more air than the 16g open wastegate I would def get headstuds.. i would rather spend 300 bucks on arp than watch my head go to the moon lol.. but im not sure if stock studs would hold im just too poor to take risks like that! Goodluck

 

20psi on that size turbo will make torque late enough and keep heat down enough that i'm sure head bolts would be fine. i know someone doing it right now (for the past 2-3yrs or so). cylinder pressure is cylinder pressure no matter how it's stuffed in there.

 

For a turbocharged engine generating somewhere in the neighborhood of 2500 psi cylinder pressure from combustion, does anyone think it really matters to the head fasteners if the boost gauge reads 20 psi or 40 psi?

What stresses the head fasteners is torque (pressure), and to a lesser extent in street applications, horsepower (heat).

 

what does the fq400 make in terms of boost? what is the part number for the studs? if the part number match and depending on how much boost it pushes should gve us the answer.

 

What does this have to do with anything?

 

well let me spell put my thought process.

the fq400 makes about 400hp. I don't know how much boost it runs.

If the fq400 uses the same head studs as the gsr then you shouldn't have to worry about the studs failing on you. how would you know if the studs are the same in both cars? The part numbers will be the same.

thats what it has to do with this thread. am i way off base?

P.S. If you do anything that involves the stock studs then upgrade em.

 

clarification for any noobies reading this:
OEM uses head bolts, not studs.

 

Thanks good to know! Either way he wanted to know if he should change his bolt-studs, stud-bolts. You know what I mean.

 

I am leaving my head bolts in until I need to take the head of for ANY reason, then studs will be going in.... because you cant reuse the oem bolts, and the studs are relatively inexpensive for the peace of mind and abuse they take.

 

Especially since 25psi can mean very different amounts of airflow depending on the size of the turbo.


I put studs in my car when I switched to E85, took me an hour and cost $150 with a valvecover gasket and the studs. Cheap insurance for lifting the head and very possibly hurting something in the motor when that happens.

 

You're @ 40psi and beyond on an oem turbo? Is that even possible?