i have a 2005 evo 8 with 125,xxx miles that i blew a head gasket on so now im doing my upgrades while im in there.
MODS- Evo is basically stock how it sits with tbe, cone intake, licp, twin disc clutch, evo 9 bov, and aluminum radiator.
Im rebuilding the head with new all gsc parts: s2 cams, valves, lifters, valve seals, seats, beehive springs and ti retainers with arp head studs.
New bolt on mods are bigger intercooler, ebc, radium fuel rail w/ pulse dampener, fic 1050 injectors, walbro 450 e85 pump, and an Arashi TD06hr-r2 turbo with kinugawa wga. plan on duel 91/e85 maps.

which bar spring should i get for the wga if my goals are around 500 hp? 1.2 bar? 1.5 bar?
also am i missing anything important in my setup?
do i need an omni 4 bar?
thanks

edit: aslo found this,

is this correct?

 

22psi

 

thanks for the reply

 

i could be wrong... but dont you typically go for a spring that is about 1/2 of what your peak boost goal is?

 

ive read that as well. just finding conflicting threads and trying to get a concrete answer, but guess ill just get the 22 psi and if i need to change the spring up or down ill buy it later

 

The important part is just make sure its less than the boost you want to run. Example , if you want to run 30psi, set wasetgate to 25psi and use the boost controller for the rest. This way the controller shuts off vac going to the wastegate and can make the turbo spool a little quicker.

 

After several years using of Arashi anti-surge TD06SL2-ER-10.5, bought and installed used stock Evo IX turbo...
Now my Evo IV accelerating like never before, it's awesome. Boost up to 1.5-1.6 bar.

Arashi turbo wasn't go pass 0.9-1.0 bar on 1st and 2nd gear, but this go 1.2-1.3 bar easy

 

would depend on the fuel u would use and whos tuning the evo