hydra

Hey all,
I'm in the process of gathering parts for my CA18DET, and I wanted to compare notes with those of you "in the know" about a few things. I've already purchased a GT2860R dash 5 turbo (almost the same as the RS) with a 0.64 A/R ceramic coated exhaust housing, and already have a nice Mustang/Taurus Electric Fan lying around. My goals are to make a genuine 320-340bhp @ no more than 20psi while maintaining the best throttle-response and lowest boost threshold possible. Since I have a 4.36:1 rear end, I'd also like to extend my powerband as much as possible, shifting at 7500-8000rpm. Here are the mods I have planned:

- 3" turbo-back exhaust with divorced wastegate elbow

- Custom water/air intercooler setup in place of the battery. The idea is to reducing intake piping volume as much as possible for better throttle response.

- N62/N60/E60/P60 MAF depending on price and local availability. Any suggestions input or feedback?

- I'd like to keep the stock exhaust manifold, and maybe ceramic coat it. Again, the idea is to maximize response. How much power would I be giving up compared to an "ebay special" manifold? More than a handful of bhp?

- Walbro 225lph in-tank, is it true that these things regularly bump up fuel pressure from 36psi to 43psi on our engines or can I not count on that when sizing my injectors?

- Speaking of injectors, a friend with a turbo CRX has a set of 444cc R32 GT-R injectors he's willing to swap with my stock 370s. Trouble is that I know these are too small unless I bump up the fuel pressure with an adjustable FPR, in which case I'd be better off buying a bigger set of injectors in the first place.
Possible choice include 460cc RX7 injectors (still too small), 550cc RX7 injectors, and 560cc Mitsubishi Evo injectors (my first choice because I can source them locally)
What, if anything, is needed to make these physically fit?

I'd also like to upgrade the intake cam, using either a CA18DET exhaust cam or a Tomei 256 Poncam intake with the stock DET exhaust. The difference may be only 8 degrees between the two, with the same max lift, but how much fatter/more aggressive is the Tomei grind than the stock 248 degree lobes?

- Custom short-runner intake manifold with secondary butterfly delete. From what I understand this will really make a difference between 6000-8000rpm without much of a penalty in midrange torque

- A nice water-injection setup to top it all off and squeeze that last 20bhp out of the engine

- Finally, a suitable ROM tune. Would I be better off with a mail-in tune or should I tune it myself?

I'd love to hear your comments/input on my proposed build. How reasonable is it to push 20psi and 8000rpm on a stock-block CA18DET? This of course assumes the engine is in good shape to begin with, and that the tuning is spot on...