Alex S

Hello Everyone, It has been over a year since I have been on this forum as I decided to buy a 2007 Chrysler 300C. No regrets... Just finally able to save up enough money to buy a cobalt too.
This is where I am at, I will be finding a nice N/A SS cobalt and adding the LSJ supercharger to it and I have a few questions I was unable to find.

I am not looking to only crank out mid to low 200s with this car... with that being said what in these motors actually needs upgraded to hand around 300-350. From what ive seen it is capable to get this number with this supercharger... however you need a small pulley and engine internals beefed up to handle the extra boost its pushing.

As for the transmission, I would get a beefier clutch and i wont be launching it very often or at all, especially with the transmission stock. If however i did want to launch the car, What components in these transmissions would need upgraded ?

Lastly, what ever cobalt i find will more than likely have around 100-150k miles and will have some maintenance to be done. Disregarding the fact that i would want to boost it, what might be getting to the point of replacing to produce longevity.

Thanks in advanced everybody !!!

jdbaugh1

iTrader: (1)

Your goal of low to mid 200's is realistic on stock internals and pump gas. If you actually want 300-350 you would be best of going with a Harrop HTV1320 supercharger. You would be pushing an M62 over it's limits to hit 300hp even with E85. Basically if you want over 300 hp you need to choose between turbo or a 1320.

Drivetrain is fine except you will eventually need a clutch.

There are other people in here that are very knowledgeable about what internals you should replace at what power levels for the 2.4 that will hopefully chime in. But as far as beefing it up for more power you shouldn't need more than rods and pistons. You will need valve springs if you want to rev higher which we typically do with supercharged Ecotecs.

chevygirl2006

First off, what year 2.4 are you getting? If 2006 you don't have to touch the internals for your stated goal. If 07 find out when it was assemblied because mid way through 07 they threw in the weak internals that's in the 08 2.4.

The above statement saying 300 is pushing the m62 to its limits its very untrue. They are capable of much more. Low 300s is doable with small pulley, full bolt ons, ported head, cams and e85. But in my option that's a lot of wasted money to achieve those numbers. You won't get near 350 without nitrous.

Realistically if you want 300+ to the wheels you need to get a tvs 1320

jdbaugh1

iTrader: (1)

How is 300hp+ not pushing the limits of an M62? Pushing the limits ≠ impossible. This is the second time you have said I am greatly mistaken like the last time you said it was safe to push over 250 hp on stock 2.2 motor. Running on the ragged edge waiting to blow up is not what most people are looking for. Remember he mentioned longevity?

chevygirl2006

I told you in the last post I didn't know you were a 2.2 and thought you were an lsj. That's why I questioned why you were changing internals. And no 300+ isn't pushing it on the m62. Hondas run the same blower and are averaging mid 300s with it. They get over 300 easy because their head flows a lot better than ours and their compression is higher. Some people have been close to 400

chevygirl2006

And I agreed with you on the stock 2.2 being weak and 250whp is a decent safe stopping point.

jdbaugh1

iTrader: (1)

Now that is just being pedantic. An m62 strapped to a standard Ecotec was implied in my post. Being on a Cobalt forum I didn't think I had to explicitly state that.

chevygirl2006

He can still get much more than 300 on that blower if he wanted to spend a lot of money like zzp did. You implied that 300 is pushing limits on the m62 but it's not. It's capable of of more even on a cobalt. But I agree with your other points. He needs to just get a tvs or turbo for those goals. Cheaper at the end and more room for play