does anyone now how much boost the new 2008 turbo cobalt's block hold and what would be a safe amount of boost to run?

 

to soon to know but i hope a lot more that our belove lsj

 

how much boost does yours hold?

 

dont really think you can compare SC boost to Turbo Boost way two different areas there

 

The boost in the SS/TC varies based on driving conditions and amount of load.
So far the max P.S.I. is 21

The ecu is tapped into that so it will never boost obove that.
No manual boost controllers here boys.

Of course. A **** load of tuning, plus a stand alone ecu, and a big turbo to make it worth your time of doing all that work. And you can prob boost up to 24. But there's no reason why to boost that high since you should run a bigger turbo

 

I think he is more so asking how much boost can be run before something breaks.

 

yea im asking if anyone knows how much boost the block can hold before something breaks?

 

The question should not just be how much boost will the engine take before it blows up, but how are the limits for modifications to the motor before it blows. Boost doesn't mean anything; it is simply a measure of the pressure entering the combustion chamber. There is alot to consider to really answer this question. The basic internals are probably the same as the LSJ but without knowing for sure what pistons and compression ratio it is hard to say what the max psi the motor will handle before you get the combustion chamber too hot and start causing detonation and knock.

 

internals aren't the same, piston design has to change for direct injection

 

The block has no issues. The first thing that will go bye bye is the rods. The rod beams will begin to fold at about 400 HP. The head gasket will go bye bye at about 450. Beyond that you start to get into needing the full length mains to head studs configuration and orings on the fire deck.

The only difference between the GM race block used for the 1450 HP drag motors is the water jackets are half filled with hard block and the full stud clamping system. They are currently putting 60 LBS of boost in those on methanol.

The basic difference between an LSJ and an LNF short block is the LNF has different pistons and someone help me here oil squirters for piston cooling. I cannot remember if the LSJ has that or not. Its been a few years since I looked inside of those. Other than that the SB is the same.

ecotec upgrade data.
http://tunersource.gmblogs.com/Racer...mplete-web.pdf

see page 86 for the HP breakpoints and required part upgrades.

 

what most people still don't get is that the lnf in the cobalt won't hit a certain boost # like the lsj will. the car is programmed to hit a certain torque #, and will limit/increase boost as needed to hit that #. untill tuning comes out, you will not get over the stock power #'s. so i wouldn't worry about that for a while.

 

correct. people have tried to jack with the waste gate rod only to find the software backs it back down if torque above the target number is achieved making it futile.

 

LSJ also has piston oil squirters.