Weak? I can go to town on my car with an RB20 and it never needs to be put in front of the authorities short of being pulled over and requested to do so. Yet put something with a non RB20 engine number in my car and all of a sudden the whole car gets called into question I have seen friends go through it and when servicing at rallies the guy who helps out is a CAMS and Snr Vic Roads guy so have a good understanding of what the expectation is...even if you can short change his expectations a little.
Re the RB24, i want to run my TD06-25G and on an RB20 will be a cop yet in Japan they seem to be very popular setups on RB24s and at the end of the day i am hoping for a reliable 300rwkws. Also, all the RB20 valve gear etc works with the RB25DE R32c head so still leaves me with plenty of options with regards to running the 26 bottom end, RB30 bottom end, my current exhaust manifold, plazmaman inlet manifold etc. A change to an RB25DET doesnt mean i can use all those parts
So, lol, not saying its for everybody...but i can justify it for my circumstances....and i do believe that i would be wiser to simply use 82mm pistons and a bump in compression to around 9.0:1 and stick with RB20 crank, std head etc. BUT, i want to see if the 25G can for shits and giggle and plenty of boost pull a wanker figure on the dyno