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OK, hang on a second. (Puts flamesuit on). Alright, I'm ready to ask my questions now.

A little background first. I'm currently setting up my D17 to run about 8 psi of boost to start out with. Here are the upgrades I've purchased, but haven't installed yet, and some I will buy when I get home from this business trip.

Crower springs and retainers (bought)
ARP head stud kit (bought)
new OEM head gasket (bought)
K-Pro for the D17 (will buy when I get home)
The rest of the turbo stuff (will buy when I get home)

Now, I'm only going to run between 7-8psi off the bat, but with the upgraded valve train, I would think I'd be able to up the rev limiter a little. Of course this all depends on what kind of power there is to be made above 6900, but if there is any, I would like to think my engine could take it. Does anyone have an idea of what rev limit would be safe with the reinforcements I have planned for the 8 psi build? The dyno will be the real determining factor to see if its worth going past the stock redline.

Later on, the bottom end will get the full treatment of new rods, pistons and sleeves, and I won't replace the cam until then either. Once that's done I can run around on 15 psi all day long and should have no problems with a redline of around 8K - again as long as I'm making power above 6900.

Let me know what you folks think.

 
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Andyman ill let you handle this one.. <- But hes redline is 8 something K

 
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Good to know. His setup will be about what I want to end up with. Thanks.

 
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I wouldnt trust the rod bolts for long with higher RPMs. thats where your failure point will be, and it seems they start stretching around 9psi with a stock redline. the stress goes up exponentially with the revs.
You're gonna have to just stick it on a dyno and cut the motor speed off where the power dies, which will depend on the cam. A stock cam probably wont make it much further, but for safety's sake, I wouldnt push it up too far. 7300 maybe.

 
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Thanks boilermaker, I appreciate the insight. Since this is my first turbo build, I'm trying to do it right rather just buying the Brand X $3K kit and calling it a day. After doing so more research and seeing the couple responses here, I'll probably just install the new springs, retainers, and head studs, and then just leave the rev limiter alone until I upgrade the rotating assembly and the cam.

 
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is there a benefit for putting new springs and retainers with a new cam? i thought they were used to allow for a higher redline with a new cam?

 
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Anything stage 2 and up is required to have an upgraded valve train bc the of the higher lift. The stock valvetrain was not designed to handle it so they would fail very quickly probably snap in half the springs that is.

 
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my redline is set at 7200. NA stage 2 I don't trust the rod bolts past that NA, under boost I would just keep it at the stock redline or at 7k max

 
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So if "one" were to have hondata and a stage 2 cam.

What parts other then the valve springs and retainers would "one" need to upgrade inside the head in order to successfully rev to 8500 RPM’s all day naturally asperated?

Rod bolts?

Thanks!

 
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dont forget about your fuel system. MY rsx-s injectors are almost capped out around red line at 6psi.. 8psi and youll probably be pushing those injectors to 100%+ duty. A return conversion and a higher rail pressure will be a must.

 
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^^^ Exactly on the fuel system. I've got the RSX-S injectors and will be doing the Y8 mani conversion when I get home for the better upgrade options. I figured the RSX injectors wouldn't last for anything past 7-8 psi, but I got a great deal - $60 for all 4 - so I couldn't pass them up.