Tool26

I guess what im really trying to do is get full boost (~1bar) low enough and then rev high enough to have at least a 5,000rpm streetable power band(rb20's with this seem to go from nothing to everything in no time, not being ver ystreetable). And i was looking at the few actual dyno sheets posted in the rb25 upgrade thread and it seems they can come onto full boost ~3000-3500rpm but then die out by 6500-7500 at the latest. So i was hoping to keep the relatively quick spooling but then stretch the power band to 8000-8500 (even more if safe). So i thought trade a little displacement for a couple thousand rpms(rb24). However if i can just squeeze the extra couple thousand rpms out of the rb25 then I would gladly do that. Can it be done? can i get somewhere between 8000-9000rpms safely? What would i need to do in order to achieve this reliably? Clearly i wouldnt be taking it to 9k all day every day but when the urge strikes me id like to be able to without worrying. Solid lifters? Cams/cam gears? Lower compression? forged pistons? Also it looks like the hks gt-rs can make 270rwkw @ 15psi, with full boost coming on around 3200 with pretty normal supporting mods. Would this turbo be able to make this power efficiently all the way up to 8-8.5k or more? Thanks in advance for any info as i am pretty ignorant when it comes to this sort of stuff.

Im planning a build in the very near future for a s13 240sx here in the US. I have been reading a ton about the rb series motors and know i want to use one. I like the higher revs of the rb20 but dont like like the lack of torque and amount of lag I'd be looking at to use the turbo I'd need for ~300kw at the crank. And i thought about the rb2x build with the rb20 block, but its pretty expensive. So since i can get an rb25 for very close to the same price as the rb20 (here in the states) I was thinking about putting an rb20 crank in the rb25, with solid lifters, and maybe 8.5:1 CR?, in order to find a good middle ground between high revving (from the shorter stroke) and decent low end torque and displacement (from the larger bore) for spooling purposes, not to mention better flowing head. I know a rb24 was made similar to this from the factory in cefiros but with a rb30 head and carb'd so im hoping this would be simple. Is this an alright plan? I figure i could get a straight up trade with someone for the rb20 gear since a lot of rb20 owners want the rb25 stuff, so it would be cheap for the two of us. Plus i like the car staying a true 240sx lol. What id like to know from some more knowledgeable people is what kind of rpms could this be able to handle safely? Im hoping ~8-8.5k is this wishfull thinking? Would the larger bore compromise the integrity of the block at high rpms? And what would be the most responsive turbo to make 300kw at the crank which i guess would be ~250-270rwkw at a conservative 12-14 psi. I want the longest power band i can get.