on what fuel?

 

I'm not sure how this guys question was so hard for you guys to comprehend. .

The most boost on stock block i have heard of is 34.8 by TTP Engineering.

I am not sure how much cylender pressure the stock internals can hold in the end, but it would be nice if everyone would stock ***** footing around and actually answer the question.

Given A GOOD TUNE, what is the max boost that the stock internals can handle before letting go? I don't give a **** about "well does the car have the right gas?" "Does the car do this, or that?" WHO CARES he just wants to know a simple question that is very logical to ask.

 

now that we are mentioning boost levels...what boost do u guys recommend i should run when i get my car (evo 9) tuned (probably ecutek or dynoflash) on 93 octane with TBE, upper and lower ic piping, mbc, and drop in filter? im guessing 22?

 

I'm sure you can hold 35psi on the stock block (with no det) for a few passes since there will be very little cylinder wall expansion (closed deck), just gotta worry about lifting. That said I'd say more than a few passes bye bye rings! The stock piston/ rings jsut aren't designed for high boost applications. But at those pressures it'll take just one random det event to blow out the rings...

 

"How much boost can the stock block handle" is not a very good question for several reasons, the most obvious being that running lots of boost with a small turbo creates a different set of problems than running the same with a large turbo.

Assuming one is speaking of a small turbo (e.g. 16G variant), applying lots of boost (e.g. 30+ psi) is only possible in the midrange, which essentially means that a substantial amount of torque will be generated. Torque refers to the amount of static force being applied with each piston stroke, which places a great deal of stress on those fragile connecting rod bolts, bearings, etc. Likewise, as torque is increased, the motor will have very little tolerance for detonation.

With a large turbo, torque isn't as much a problem as is heat produced from generating considerable amounts of hp. This heat must be dissipated by cast pistons, which weren't exactly intended for generating upwards of double the factory power rating.

There is no magic cutoff point where boost and power is concerned whereby the factory engine will suddenly let go. There are several potentially aggravating and mitigating factors that apply, such as accuracy of tuning, driver habits, etc., and so forth.

 

I think you got your answer about the boost thing....

Ted, I did want to say one thing about the motor though. I am pretty sure the reason the hard parts fail is due to high revs, knock or a ton of power at high revs. The G forces sustained at 9k on the rods is a HELL of alot more than at 7k.

And about the boost. I have hit well over 35psi a few times with mine. I normally run it close to 30psi. Stock engine/head with a GT35r.

 

lol LOL