Food for thought, just install a turbo from a R33 RB25DET onto your RB20DET - run 1bar of boost and enjoy the car till you can afford that GT-R of yours.
The more you research, the more you ask questions everyone will give you the same answer or so.. the RB20DET is shit.
RB20DETs are gay, I had one.. SR20DETs non-VCT makes more torque, hectic a SR20DET VCT makes even more torque.
I've owned a RB20DET so I can bag them out, they're shit.
hrms...
no sure what problems... I track my car often enough, it has a completely stock motor and yet to see it explode.. and it makes a lazy 340kW at the rears.
How it drives? I drive it like I stole it, out of corners smashing the limiter.
of course timing would jump up to that much as you move away from the idle RPM.
If you Google search a stock RB25DET timing map you'll know what I mean.
However with the cas fully retarded I would check if the crank timing marks are aligned with the intake and exhaust pulley.
heaps of power for such low boost? first time round I only managed about 310kW with 20 psi. Needed to push it to 24psi to make what I make now and stretch head studs LOL
install a massive dose pipe, hektics.
serious note, they're gutless, make crap all torque and don't waste your money modding it.
Motor out, donate to a marina as a boat anchor and NEO in.
I recommend a GTX2863 on E85
A RB20 makes very low torque compared to a SR20 due to firstly the capacity and secondly the stroke.
If you say you don't want a lag monster I suggest either a GTX2867 or GTX2863 both of which are avilable in T3 flanges.
Have a look at sonic performance, but be prepared to pay more than the motor 4 times for the turbo.