exactly what im trying to say. **** if my lsj could handle 300++ i woulda swapped a while back!

 

Yeah. But, with all of those mods combined it would cost just around the same price as a turbo swap. GM performance made 300HP with all of the GM performance bolt ons....and those would be very costly (This included the 10:1 forged aluminum pistons).

 

Just one important question, Where do you expect to get this magical twinscrew swap that works on the Cobalt?

 

now that is something new to me

 

According to GM, with a piston swap, cam swap, valve springs, dual pass plate and tuning the rest of our stock rotating assembly and ignition system can take way over 300HP.

 

you could get those mods I listed above for $1000 est. Turbo swap would be more than that.

 

It's called theory. I was using turbos and twin screws as examples because they have the similarity of compressing within themselves.

True, but the power wouldn't be made as safely. This is why there are threads popping up about people blowing cylinder #4....because they are running HP levels in the high 200s without modding the bottom end or making a more efficient setup.

 

twinscrew swap in the works (taking forever)

https://www.cobaltss.net/forums/show...ight=twinscrew

 

yeah deff. id expect anyone close to or over 300hp to have, if not all, these mods.

 

Yeah. Keep in mind also that all cooling modifications you have done thus far will work well with a turbo setup so it's not a waste of money.

Edit: Don't get me wrong...I love the supercharger setup and I like roots blowers. But, for the guys wanting to safely make large amounts of horsepower something must be changed. Whether it be a larger, more high flowing roots, a twinscrew, a turbo, or headwork, something must be done. We can't just keep going with a smaller pulley and a little cooling mod on top.

 

Thing is...can the bottom end take that in the ecotec? same with the valvetrain

 

I agree the power could be made safer but the #4 cylinder issues is a fuel delievery problem, not a piston problem. No one knows for sure but I have not heard yet of an LSJ thats popped because pf too much boost or HP. Most to all have been fuel related in one way or another from what I have read.

 

it is my understanding that the bottom end is all forged... and also i have found that forged components live at high rpm's, therefore i feel as though you would have no problem with the bottom end if all is tuned properly...

 

i would say gm stage 2, headers, exhaust, and an intake would get you to 270

 

Well....I'm not trying to correct you...and you're right it is a fuel delivery problem, but the problem occurs when alot of fuel is in demand. This happens because the roots blower setup, with it's heat it produces especially at higher boost levels, demands alot of fuel. It's not that the bottom end can't take the boost, it's that it can't take the detonation caused by either too much heat or when compensated for by making the mixture rich the fuel system cannot keep up and one of the cylinders goes lean and detonates.


The whole bottom end is forged except for the pistons which are hypereutectic. This is the weak point; this is why earlier in the thread I said if we swapped in forged aluminum pistons our bottom end is good for well over 300hp.

 

wow you guys are really hammering this thread, thanks by the way theres alot of useful informationg being brought to attention of all the people on this forum looking in to getting the most out of there S/C.

so it's looking like 300hp is starting to put way to much stress on the engine/drivetrain and is not very practical for the ecotec powertrain...??

do we have any confermation of anyone hitting 300hp other then GM?

and this #4 cylinder failing is this happening alot? or just mostly from bad tuneing?

thanks guys very helpful!

 

And you're one of those confused individuals that thinks I don't know about this.
I know exactly how long it's taking. I'm #2 on the list to receive them IF/when they make it happen. Why do you think I posted my original question of where everybody thought they would get them from.
I'll believe it's "in the works" when I get a progress update. They don't answer emails and when I call unfortunately I don't speak fax. Check that thread, or any thread for that matter, for the last time TAG posted anything in reference to this. Then tell me it's "in the works".

 

I don't think we should put a number on how much the ecotec can handle....that's guesswork. What we do know is that you cannot make 300HP and have a safe environment for the stock pistons with our roots S/C. Hypereutectic pistons themselves can actually take that much power but not when it's combined with extreme heat and detonation. I know because I've had a V8 with Hypereutectics running 330WHP without a problem.

As far as the #4 cylinder....don't think about that too much. Instead focus on the fact that the reason it is happening is because at a certain point and certain amount of boost pressure our M62 roots blower is creating an environment that demands huge amounts of fuel that our fuel system cannot deliver reliably. This in turn leads to detonation and according to some detonation at the #4 cylinder because of it's position in the fuel rail.

 

BURN!!!

 

[QUOTE=burty12;1030798]wow you guys are really hammering this thread, thanks by the way theres alot of useful informationg being brought to attention of all the people on this forum looking in to getting the most out of there S/C.

so it's looking like 300hp is starting to put way to much stress on the engine/drivetrain and is not very practical for the ecotec powertrain...??

do we have any confermation of anyone hitting 300hp other then GM?
QUOTE]

basically yeah

and well there are some guys claiming 300hp but who knows. there was that 1 kid who ate an srt4 close to 300hp, 298 to be exact but yeah he blew the motor anyways. stock pistons!

 

with my 2.7 pulley cobra H/E 60lb injectors, the 75 shot and my tune i should have been over 300 whp i would think.

 

So what can be done or what do you need to do with the fule system to upgrade for this kind of HP?

 

Maybe they don't like you, #2 on the list WOW I think I might leave the forum cuz I know nothing about the twinscrew, never talked to Mel or his brother or Mike or Mase or Rys, never been to tag, never saw the S/C, was never asked to be a tester for it. Please..... i'm glad that #2 means something to you and the noobs like this guy

----> good post, well thought out

 

With forged internals that is, and running meth all the time would really be a pain for every day driver.

 

Funny you say that. I have just learned on Ecotecforums that apparently we could change our fuel pump or add an inline fuel pump to increase pressure and then use properly sized injectors