how much HP can the stock internals be pushed to??

 

since no one has even s/c or turbo'd a 2.4L your guess is as good as mine. GM might know

 

i think we will be fine at 250whp

 

The GM build book shows the 2.2L going up to about 286HP prior to part failure. The 2.4L VVT engine has some slight differences designed to make it slightly stronger then the 2.2L.

From the GM media docs;
http://media.gm.com/us/powertrain/en...06_PWT_LE5.pdf

• C70 material forged steel connecting rods
• the block's bulkheads (where the main bearing caps attach) were enlarged for added strength
• Approximately 2.5 pounds (1 kg) of mass was added to these and other critical areas of the cylinder block structure.
• water-jacket is deeper into the block for added cooling
• block-mounted oil cooler is included
• cylinder head casting is by a semi-permanent mold process to achieve higher strength

However the engine has a higher CR then the 2.2L so that is an obstacle that also has to be overcome. I'm not sure how much more power you could make then a 2.2L but I'd guess it could possibly handle near the same 286HP prior to having some of the same issues. Check out the build book and some of the other resources online, they show the HP that various issues started happening at and what they did to overcome them.

 

i think tranny issues will come before engine issues imo

 

I belive hahn is testing a turbo kit for the 2.4 sol, and is at or more then 300 hp

 

the 2.2L is reliable to 250 (as in the gm build book), i would think that if anything, the 2.4L has better than the 2.2L internals, if that helps.

i have to call gm tomorrow anyways about my other project, i will ask them.

 

well thats cool for the engine but i know the auto tranny wont hold that

 

i was refering to the original question asked.

 

i know i was just throwing in some extra info so no one gets the wrong idea

 

The compression on the 2.4 is kinda high to with stand 300hp reliably, imo

 

Well he's currently still doing testing and has said that he will not relase the kit until he's happy with performance and reliability, and with his reputation, i'll truts that. But yes its a little high, but when i went to Vector Motorsports for my na tune, they said that with a good tune the motor will be able to run 8-9 psi safe. Hopefully some lower compression pistons come out to the market. Also a thicker headgasket will lower it a little bit. Although now thinking back the 300hp was at the 10-12 psi range and were seeing i believe 260 at 7-8.

 

260 at 7-8 is fine with me

 

Lol, me too. I got the money for a turbo kit too I have a feeling I will run into a tranny problem though.

 

yeah i can afford the kit but being that the auto tranny wont like that much power without being upgraded so ill just have to tune the kit to be at exactly 250whp

 

Well I got the 5sp but I bet if I do go the turbo route, I might as well be ready for a new clutch or something.

 

yeah the stock tranny wont hold in either situation but the 5 speed is easier to mod i think, im not sure if i will have to replace more than my tq convertor to hold the extra power or not