5sfe Pistons, when we add a turbo... Options

[Neil_Y]

when 5sfe add a turbo, Do we need to change the pistion for the turbo running?

becase factory is for NA engine turbo need more accumulator groove,right?
and 1 question, if the compr. larger or smaller,what thats mean?
and i saw the aftermarket pistion from ebay.
Pistons from ebay.

This post has been edited by Neil_Y: Apr 28, 2009 - 4:49 PM

[_Jim_]

I think Smaay just rounded down to provide some basic ball park number. You cant pinpoint a specific horsepower number to each piston or a certain psi. It all depends on what turbo you use, how well you tune the car, and the current condition of the motor. Its silly to argue about minor details with stuff like this.

Neil_Y, no you dont need to upgrade the pistons or anything internal on the engine, however its a good idea to see what kind of shape your motor is in. If you have a lot of miles on it, or if its currently burning oil or has any other issues, it might be a good idea to rebuild it or swap for another engine thats in better shape.

Yes agreed that you cannot pinpoint a specific HP number, I haven't done this. I gave a more REALISTIC ball park number. Pressure is pressure, so 15 pounds of pressure is the same for ALL turbos.....so 15 pounds of pressure from turbo A is just as safe as 15pounds of pressure from turbo B, EVEN if turbo B flows twice the amount of air as turbo A. The pressure is still equal. Which is why I say 15psi will not hurt a stock 5sfe motor, its been proven SEVERAL times.

Everyone knows that bigger turbos flow more air at the same psi then smaller turbos, this is why I said the 5sfe is good for SUB 300whp (350hp) and SAFE at 15psi. The original poster can use any turbo he chooses and be safe using these values as a guide as long as long as neither value is exceeded. If he buys a MASSIVVEEEEEE turbo and runs 300whp at 11psi he is fine.....If the original poster runs a smaller turbo and makes 240whp at 15psi, he is fine. Both instances have different HP to PSI ratio, but BOTH are equally safe because both setups are within the "safe" limits of SUB 300whp and up to 15psi.

Yes, all motors are different. and everyone wanting to turbo charger there motor should do there own due diligence. All motors should have a leak down, and compression check done before committing to a turbo setup. These test will allow a look at what condition the motor is in, and should be done first. If all tests come back with good results, then these safe values are just that....safe. As for tuning, that's a given.....if you don't know what you are doing you can blow a motor at ANY HP level or ANY PSI level.