There is no doubt that an RB20 is breathless compared to the bigger displacement RBs when under 3,000rpm and off boost. BUT do not underestimate the grunt and speed you can get out of a std RB20. There isnt an RB25 going to the track with SAU-VIC that can catch my 260rwkws RB20 at the track. That includes a 320rwkws R34 GTT. Similar power SR20s are also slower, so...dont write off the internally std RB20 as laggy and no good for performance.
For a punchy street car, yes they are compromised. But for outright performance they can match up to GT3 Porkas with no real problem at speed.
So for all those people saying no good from 200rwkws. Well have a look at the below graphs
STD RB20 with a TD06 turbo and ECU upgrade
Compared to a std turbo RB26 with Poncams, and same dyno and same tuner
As you would expect the Rb26 spanks the RB20 down low, but it has a usable rev range over at usable road speeds. You can see the RB20 punches well above its weight being comparable to a well sorted (breathing mods) std turbo RB26 !!!!!!!!!!!!!!!
And here is the results from a program where it compares different dyno plots, and as you can see my RB20 isnt struggling against a pair of similar powered RB25s from R34s with Hi FLows and Poncams.
Keep in mind behind every engine is a gearbox, diff and tyres, so it means DICK at what rpm you make power, its all about at what road speeds you are making good power over !