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do a search this has been covered many times. not many mods need to be done as they both obviously use the T3 flange, main differences are the snorkel/elbow whatever u want to call it which comes off the comp. housing (few options there) and the actuator, RB20 actuator will hold more boost stock (without a controller). pretty straight forward but try and get all the lines etc just incase something doesnt line up.

I put an RB25 turbo on my RB20 about 2 weeks ago. Haven't got an ecu/tune yet so only running 12psi but it goes MUCH harder than the RB20 turbo.. just takes an extra 800-1000rpm to come on boost :) Oh and it will also hold the boost till redline, had it at 14psi but it was pinging over 6000rpm so dropped it back to 12psi (to give me a bit of leeway on cold nights) until I get a tune.

I put an RB25 turbo on my RB20 about 2 weeks ago. Haven't got an ecu/tune yet so only running 12psi but it goes MUCH harder than the RB20 turbo.. just takes an extra 800-1000rpm to come on boost :) Oh and it will also hold the boost till redline, had it at 14psi but it was pinging over 6000rpm so dropped it back to 12psi (to give me a bit of leeway on cold nights) until I get a tune.

So its even more laggy??

Mine comes on boost at 3,000rpm, so ur saying it wouldnt come on till 4,000rpm now?

My Rb20 turbo used to start spooling a little over 2000rpm with full boost by probably 3000rpm, now it starts spooling around 3000rpm with full boost by about 4000rpm. My standard injectors and fuel pump are going fine, got an 044 to go in probably this weekend though. Then save for an ecu :thumbsup:

Edited by bubba

completely depends on ur tune as to how the turbo will react, u really need to get it tuned. im in the same boat, put mine on and have been too lazy to get it remapped, so lag is pretty brutal and im only running 8psi, but it still goes hard considering. main thing ull notice is up high where the RB25 turbo keeps on truckin where the rb20 fades off.

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