So how much boost can the stock engine handle. I know 400whp is ...

The motor can handle around 400 to 450 hp ish from stories I've heard. That could come from 18 PSI from a big turbo or 25 PSI from a smaller one ...

I wouldn't go 400whp..that block will not last very long especially some hard driving. Dchee RIP Chris Schoen-Kiewert of EFI Logics - 7.23.2012

... power you have to get forged pistons and rods. Can a stock engine handle like 15 psi? If it can how well can it handle it. If you run 8 or 12

The rule of thumb is 10 hp per 1 psi of boost. You will need at least 10 lbs and a good inlet system to get you the 130 extra.

A turbo of that size can EASILY make massive boost and hold it all the way to redline. Most people accept 400whp is about the limit of the stock ...

You know that gasoline engine rated for XXX HP does not run at XXX HP always. If you boost the engine to XXX HP and do street driving only, it ...

There are many stock engine ST's running around with 400whp for many thousands of miles. There are ST's that have also blown up within the first ...

The pistons and cylinders are not designed for boost so 9 or 10 psi maximum. I broke a ring land on a piston with just a touch more boost.

Perfect turbo for our cars. A few thoughts. It's early so stick with me if I'm not making any sense. At 400whp I'd say it's more a ...

All of which were reported with either bad tunes, improper supporting mods or just waaaay to high of boost. On pump gas 10-11psi seems to be the ...

Sure 5-6psi is a good starting point. Safe is relative to your comfort level. 7psi will probly clear 500rwhp and 10psi about 600rwhp.

400whp is more 20G and up territory. Also goes without saying you need a lot of supporting mods to get there.

stock internals will hold that extra boost oh well any opinions? please post back thanks! ... just stay below 400whp and you'll be ok. I see more ...

sorry to change it up but th sr55 pushes out 500 hp at only around 15psi? thats insane, where can i learn more about it? Bubis 04' Aspen White ...

Who knows, it depends on factors such as turbo size, and tuning. Boost is not the limiting factor of your engine, actual power being made and ...

I'd be afraid to push 400 whp on the stock block. NoRS. Save Share ... So initially the engine was 315 or so and still more than ...

No more than 400RWHP depending on the condition of the engine. I have 371 with 7 psi of boost. Feel fairly comfortable.. Reply ...

Reliable is the issue. I've got a built 400+ STI, downtuned to 22 psi, 45,000 miles on the built motor, no issues. Lasting fun factor.

So the engine will make more or less hp at any given "boost" level depending on the turbo etc. A Huge factor is your octane level available in ...

2.2: These need rods and pistons to make any sort of good power. Around 250 torque the stock rods will go. Stock internals aren't good for much, ...