rb20 turbo actuator troubles

[Nismo_R31]

hey guys i got 2 x rb20 turbo chargers an both got two diff sizes actuators? which one is correct one?! i added an attachment

[BHDave]

Big one on the left is the same as mine.

92 model R32 GTS-t.

If they both fit then it shouldn't matter. Just depends which one has the heavier spring and will hold boost better

cheers

Dave

[Nismo_R31]

oh ok. well i cant over boost my turbo or nuthing i think its actuator due too i put the small one in an it wouldnt boost over 5psi!

[Cool Hand Luke]

Actually i dotn think the physical size has much do to with what boost it will run at. The rb25 turbo i put on opens at 9 where as the 20 turbo which had a smaller actuator opens at 12.. It just depends on the spring tension

[Nismo_R31]

then wats stopping much boost controler from controllin the boost! i disconnect all the wires an it should over boost shouldnt it!? but i get onli 10psi

[J.B.E]

If your running an electronic boost controller, it will control your boost only if theres power goin to it, otherwise your boost should run at standard pressure. For it to over boost you would hav to disconnect the hose goin into the actuator which will stop the actuator from workin at all, causing overboost. But dont do that as overboosting will cause damage.

You can use either actuator coz it does'nt really matter, the only difference could be (as mentioned) 1 might have a a softer tention spring in it than the other causing it to run a lower minimim boost setting but if you hav a boost controller you can bleed off the air and put the boost bak up.

The 1 on the right looks like the 1's on the R31's which i think hav a softer tention spring (not sure) and the 1 on the left looks like the 1's of the later model RB's. hope that helps

[Nismo_R31]

I GOT BOOST CONTROLLER PROFECT B ONE! I ACTUALLT TRIED TAKING HOSE OF ACTUATOR TO TRY OVER BOOST IT AND I GOT NUFIN SAME OLD BOOST RADINGS OF 8-9PSI.