boost question

[-Justin-]

it's a nissan question sort of but their are a lot of pros here and the concept of the turbo is universal

Have found a chip that only runs 5psi of boost on a rb20de block. Have a factory RB20DET turbo, I know these don't run 5psi factory so my question is how do i get the boost down and to run safely at 5psi. By adding a 3 inch exhuast i will be increasing my boost as well?
cheers

[gasman]

you would need a softer wastegate spring to drop boost.

[iOnic]

External wastegate with 5psi (or thereabouts) spring or change length of internal wastegate actuator arm (trial and error - easiest to just weld in a threaded section so you can wind it in/out)

[-Justin-]

definitly need it to be adjustable so cutting the spring isnt an option.What kind of shop would do that i live in dunedin, any guestamations on how much itll be?is their like no indepent boost system i can install or something?

[iOnic]

Not sure about Dunedin. Anyone with basic fab skills can do it. It does involve cutting and welding the actuator arm, so I'd recommend getting a second hand actuator off Trademe or something and modifying that so you still have a spare original.

[bbq1988]

just jam a RB20DET ECU & Injectors onto the factory loom and run it at 8psi

[Lith]

just jam a RB20DET ECU & Injectors onto the factory loom and run it at 8psi

^ +1

Don't use a "chip", unless you are tuning it to suit your car. Given its "for 5psi" you clearly aren't.... so stay away.

[Akane]

Have a pull spring working against the factory actuator is your best bet, lengthening the arm will just make it boost later but still boost to 8psi when the exhaust energy produced is greater than the exhuast energy required for 5psi.

[-Justin-]

just jam a RB20DET ECU & Injectors onto the factory loom and run it at 8psi

^ +1

Don't use a "chip", unless you are tuning it to suit your car. Given its "for 5psi" you clearly aren't.... so stay away.

i am tuning it to suit my car im tuning it for a 600x300 fmic and 3 inch from turbo back. Was talking to a guy who tunes chips and they can take up to 1 bar so i myte just tune it for that insteada mukn round tryn 2 bring boost down