So what made you choose CA/SR/RB/LS/JZ/ETC.

[jr_ss]

Originally Posted by Kingtal0n

you have a stock piston, stock gasket sr20 producing 480rwhp?

It will not last 200,000 miles like that. You'd be lucky to get 15,000 miles out of a stock engine at 480rwhp.
Thats over 500bhp, the rods and pistons are in jeopardy, yeah. Beyond wit's end for sure.

I missed the stock part. However, if you think a boosted LSX is going to last 200k, your beyond wits end. As stated, no modified engine is going to last anywhere near OEM life spans under much more stress, be it a V8 with 5psi or a 4cyl at 20psi.

[Kingtal0n]

Originally Posted by jr_ss

I missed the stock part. However, if you think a boosted LSX is going to last 200k, your beyond wits end. As stated, no modified engine is going to last anywhere near OEM life spans under much more stress, be it a V8 with 5psi or a 4cyl at 20psi.

Well now wait a minute. I said 5psi. Imagine you drive up north where the elevation is +5000 feet or so, that is similar to removing 3~ psi (I am not doing the math here, but its close).

Same with driving below sea level, if we could do it, it would add ~3+ psi to the atmospheric pressure. Which after adiabatic efficiency factors in, is about 5psi from a turbocharger.

So are you saying a stock LSx engine wouldn't last as long, if I could drive it a couple thousand feet below sea level? Of course not.
By the same reasoning it would last longer at higher altitudes (nonsense)
Furthermore, if the temperature drops from 80*F to -5*F (30*F at the inlet) you are also gaining 3~psi ( again, not doing the math, but the idea is the same: more molecules/area = more power) which by your reasoning would also increase wear and tear substantially.

5psi is nothing. The engine wont even know it's turbocharged. If you didn't want to spend on injectors of course you wouldn't even need to upgrade the injectors, not because 5psi is within the limits but because we have the ability to dial adjust the boost pressure and regulate the proper number to be safe(how about 4psi at 7000rpm due to headroom, 6psi at 6000 for VE, 3psi at 3000-4000 for safety around peak best torque on pump gas), and especially if you play with the fuel pressure for headroom when you want it (just for one dyno run to show X00 then I set the fuel pressure back down and drive it at 440bhp). The idea is to overcome the engine's VE shortcoming on the stock cam. You say 100% VE at 4000rpm? Okay, but not at 6000rpm. The 5psi comes in to fill the gap, giving you a full cylinder (about as full as it was without the turbo at 4000rpm). I see no additional significant "stress" that the engine is otherwise unprepared for.
And finally, look at all the 7psi supercharger kits available for practically every car in the world, from miatas and corvettes and 350z's and more. All those kits work with stock engines and do not have any substantial impact on the service life of the engines, when they are well maintained. Again I will point out how depending on your altitude, and temperature, all engines are +/- 5~psi of "boost" in the USA regardless. If I live in Colorado, and I wish to simulate Florida's atmospheric pressure, I need that 5psi just to get back to "normal".