when metalic head gasket and stronger studs are needed?

[BATTOSAI]

I wonder at which Psi will be neccessary to upgrade the head gaskets and the head studs. I didn´t see nobody doing it on any setup I´ve seen.

[maldo]

I had ARP head studs on my B6T, more so a precaution than neccesity. Stock Mazda/Felpro head gaskets are good to about 18psi on the B series motors.

[boostedmx]

i am running a o ringed head and block as well as arp head studs and a copper head gasket. i over built this engine for 35psi and 125 shot of nitrous. this year im running 20psi no nitrous just to take it through the heat cycles a couple times before the boost goes up and the nitrous gets thrown in. i would say 20 psi would be a good point to start upgrading to studs and metal headgaskets. stock could probably handle it but wouldnt last.

[JWMotorsports]

It also depends on what size turbo you are using. Keep in mind that a larger turbo is flowing MUCH, MUCH more air (cfm's) than a small turbo. For example. If I were using a t3 capable of flowing enough cfm's to support 300HP at full boost (26-28psi), it's recommended to run no more than 18 psi to stay safe. I'll be running a 400HP T3 turbo which will limit me to about 14psi of boost safely. This turbo dynoed 237WHP @ 12psi of boost on a STOCK 323 and would generate about 300WHP @16psi. If your going for BIG power number, well lets just say it's better to be safe than sorry!

[BATTOSAI]

I will go for 6-8 Psi, as I have a K8 with stock internals, so that Psi numbers are a bit overkill for what I need. I have a Garret TB355 water cooled bearing section, which I don´t think either it is capable of blowing that Cfm´s. I installed regular Kl injectors, that are rated at 220cc, a Cosmo Racing Fpr, a Vortech FMU ( I wish I have chosen a superfmu or equivalent), exhaust temperature gauge, a/f gauge, Boost/Vacuum gauge, Apexí S/afc, side mounted intercooler ( as the new protege), Beefed oil pump(5mm Shim), relocated oil filter ( as I have the turbo mounted under the nº1 cyl block), custom intake and exhaust piping. Do you know any ignition timing controller available? the apexí S/itc is out of stock, and have no info on other systems. Here in Spain, the pump gas is 98 Octane. do you think I will have any issue of preignition or pinging? Do I forget something to be adressed? my engine has 70.000km and have good compression marks.

[JWMotorsports]

You could always go with the MSD 6-BTM ignition which has a ****pit mountable timing retard nob which allows you to retard the timeing 1-3 degrees per pound of boost with a maximum retard of 15-20 degrees (I think it's 15). MSD also sells just the Boost Timing Master also. You might want to invest in a J&S Safe Gaurd knock controller also.