Turbo for rb20?

[Michael1992]

Hey There,

I currently have a RB20DET with a • 55mm inducer compressor wheel
• "E" compressor cover 3.0" inlet/2.0" outlet
• 57mm exducer T31, 76 trim turbine wheel
- T3.63 A/R
• 360° journal bearing system


I'm currently making 355whp at 20psi.

I want to change the turbo to a smaller one because of the lag, what size and mm should i switch to? I still want to make above 300whp

[Skym]

Turbo size calculator -

http://www.turbofast.com.au/TFmatch.html

[Supraclean]

Switch to a garrett BB unit of the same size. Gt2871r

[ToroGTS]

Holset hx35 is a good choice. Lag isn't entirely terrible and it will boost more than your engine is probably willing to take. You can easily maintain the same power level.

[nick-nismo]

^wrong. Listen to supraclean

[Dragon Humper]

Have you tried a good tune? And by good I mean tuned for the larger turbo. You should be at 32 to 36 deg. of ign. advance just before you hit about 7 #s of blow. Makes a huge difference.



Jon.

[Michael1992]

i think i'm going to switch the rear housing to a .48 and hopefully that will take the lag away. It should

[garetth]

Holset hx35 is a good choice. Lag isn't entirely terrible and it will boost more than your engine is probably willing to take. You can easily maintain the same power level.

Have you even tried this set up before? It will be extremely laggy.

[burton160]

I have a gt2871r and love it! The response is amazing! Supraclean is right.

[Skym]

What turbo works on SR20DET works on RB20DET (both 2 litre engines). But I think exhaust housing A/R is where the difference is to get the response on both engines.

i think i'm going to switch the rear housing to a .48 and hopefully that will take the lag away. It should

Sometimes it's the intercooler size, camtiming, exhaust size + shape to just name a few. Without knowing the setup around the turbo, hard to say what's causing the lag.