Oldgixxer knows his stuff. I was trying to lead you more toward a stage II which RCC will tell you can run with the studs, adj sprox, and head spacer. RCC says, and Boosted Cycle will confirm, that 300rwhp with those mods is doable. What Oldgixxer is saying is that you will quickly also tire of that. Meaning pistons, HD shafts, etc. Keep in mind, these HP parts for a busa are expensive per se in that you dont have conglomerates like summit and everybody trying to compete. But, they are made by ARP and the big names in forged/shot-peened/micro-fluxed/heat treated/tefloncoated/forgedwithheartsofgreatwhitesharks/etc. But it is only a 4 cylinder. You just need quality low compression pistons to prevent detonation and bending something. And from all I read, the stock crank is the way to go even for 400hp or more. Just get it checked. No need to deck the block, acid dip, 50 bolt mains/cross-drilled, etc that we do with car motors to turn the revs. It is seemingly already designed to do that. You dont have to have the heads swirled/polished/30wayvalvejob/machineshoptakes2weeks@$2k but it looks like guys put in HD valve springs so we arent getting taken to the cleaners from the machine shop like a BBC. From what I gather, Oldgixxer's recipe isnt that expensive. Get your tranny undercut for less than $500 and an HP output shaft, done. No $1000 torque converter and manual valve body/forged casing TH400.
To be honest, he has me scheming to buy a gen 1 motor from a salvage roller and build a little at a time. It is the turbo that will cost you. It is in fact the ultra plenum that will be your massive investment. Intercooled, water-injected, detonation proof, secondary injectors, boost controller interface, runboostuntilyourthrottlebodiescanthandlemorefuel. That thing costs. A lot. A lot more than anything else you will pay for. If you buy any other plenum, like me, I am stuck with my stage 1 which is now not enough for me. If you upgrade to a stage II with secondary injectors and a controller but not the ultra, a little more affordable. Still, the ultra. The precious that Golem wants. This is the key to running boost without detonation.
The reason I am telling you to ride your bike to its hardest now is that I completely underestimated what it would take 1 rear wheel to put power to the ground in a controllable fashion. I was used to the 12 bolt rear with 4.56, ladder bar recipe. No my friend. This is a new ball game. Think about the things outside of the turbo that will allow you to put 400rwhp to the ground and you and the bike not into the stands at the track. 230ish hp made me completely renovate my wheelbase and shock (which I took the cheap route and now have to go back and get the $1k tuned specifically for me and my bike and takes 4 weeks to make). You will see guys here with stage 1 kits with stock wheelbase. Fine, that is their bike and they can do what they want. But you will have to leave the line at the tree like a stop light whilst the kid in the other lane with the grudge zx14 puts at least a full second on your machine you spent huge $ on. Save your money up, research. Build a motor while you ride your bike now. Or go with a stage 2.
Understand too that 400rwhp is not what it appears. It isnt 400rwhp in 1st or even 2nd gear. You cant do that. Boost controllers allow you to put that level of power in when your wheel can handle it.
