I know that this turbo will fit into an 2.0L but the major question is how much modification if any is going to be required in order to fit this? Anyone have any idea about how practical this may be to go for a twin charge with this particular turbo or possible a larger one? I am looking for any details that you may have about it, such as which upgrades would be best prior to it...

Also, to make it easier for application specific answers, I have an 07 2.0L with Stage 2 / Fujita intake. I have Stage 3, PCM, Surge Tank, and Stage II axles on the way from crate engine depot. I want to get this turbo done after I upgrade my fuel system, ignition system, exhaust system, and clutch/flywheel. This should all be done by the end of May, early June depending upon shop time. So... I need to start working this issue right away so that I make sure I make quality purchases before then to setup this turbo properly!

 

It's not the case that the turbo will fit your engine but remember, the turbocharger has to connect to a manifold that is connected to the exhaust side of your head. You need to find a manifold that has a T3 style flange AND a manifold that has a extension on the manifold for you to use a external wastegate because T3/T4 turbochargers aren't internally gated.

Honestly, I know people will say twin charging is so so cool or whatever but...there is no need to have 2 compressors to achieve the power you're looking for and please don't listen to the BS of "turbo lag" because there are MANY of things that concur with you having a turbocharged setup that is very responsive, efficient and supplies a ton of air per PSI of air pressure.

I suggest reading more on turbocharging systems before you go any further though.

Also, look into the GT Series turbochargers. The T3/T4s are an old style Garrett turbocharger...the GT Series turbochargers are much better designed. I'd suggest you going for a GT30 turbo, that should be PLENTY for your application and I believe they offer it in a ball bearing (single or dual ball bearing) design if you want optimum response from the turbocharger.

 

One option I have considered is going All Turbo with a much larger turbo so that I could bypass some of the issues relating to a twin turbo setup in the cobalt especially. But I see some issues with range of power because of it.

Also, I just realized that HAHN is working on a twin charged setup for the SS/SC so that could potentially solve the issues right there if they were able to create something that could work in conjunction with the current setup of the supercharger.

The options... I remember the days when you could just slap some stickers on your car with a really massive and hideous exhaust and you'd have yourself a street legal race car! Life was easy back then... haha

 

I'd have to agree with NJHK; twin-charging sounds cool and all, but I would either go with a twin-screw or turbo swap.
LOL at Hahn! Sorry, but you may be waiting a looong time. They have been working on that twin-charged setup for almost 2 years. In fact the 2 companys that I remember saying they were working on a twin-charge kit for sale (Hahn and CA), have no updates on their projects in a long time.

 

WHy are you getting a stage 3 PCM if you are you going turbo? That PCM is locked and you cant tune it with HP tuner, also you will need to take your S2 pulley off and run like a 3.8". Just stick with what you have now or you will be very sorry!

 

^ Yes, that would be a very very good advise. A GT30 would be a good turbo but make sure whatever turbo you get does have ball bearing. This gets rids of turbo lag and the turbo will spin much faster. Good luck. Will be looking forward to seeing more.

 

I have an Alpine manifold and outlet pipe set up for that Garrett. If you're interested, PM me.

 

Honestly, I think even if it's not ball bearing, that size is perfect and response would still be fine.

 

I think the real issue here that needs to be said is what your goal is? Are you just looking to do something new? Or are you looking for a street legal DD, track car, etc. What are your HP goals?

I agree that a twincharge setup is "cool" and innovative, but is not realistic. Your best bet would again be to go with a bigger S/C or convert to 100% turbo system. There are a wide variety of turbos available today that have very little "turbo lag" and large gains with the proper setup. There is a lot of reading you should do to see which turbo would best suit your needs.

However, I am not 100% sure how HPTuners operates, but from what I remember one of the limitations on the cobalt's computer was map sensor? I think it was something to the effect that it could only read limited amounts of pressure (aka boost) and after that point the computer wouldn't read anymore. Not sure exactly what the issue was. Either way, with either direction you go in, you will need a lot of control over the computer to get the car to do what you want it to do.

 

Good post.

It has a 2.5 BAR MAP sensor that it can reference to (1 Bar = 14.7 PSI), so it can reference up to about 22 PSI of air pressure. HP Tuners is still a good tool for tuning even with a turbo setup.

 

In that case, you should make some serious number with HPTuners and a garrett style turbo. 22PSI on something like a 50 trim would put out something fierce. The next issue here would be what the stock internals can hold and worrying about breaking suspension/drivetrain parts! Stock axles on an ss s/c have been known to break on a hard launch on even a stock car!

Not to mention MUCH larger injectors, perhaps fuel pump and FPR, intercooling issues (can the stock I/C handle that much boost???), etc.

 

Excellent information guys! It really helps me to redirect my focus somewhat.

Since my car is more of a daily driver than anything else, I really have more of an interest in aesthetics than anything. BUT I hate having a car that looks fast that really isn't, so I need the power to back it up. I want about 350-400 HP with show quality looks. To me it's more about pushing the limits of your vehicle and seeing what you can create.

Unfortunately I'm a jet mechanic so sometimes I need a little guidance to go from the mindset of jet power back to the reality of cobalt power.

 

True about the internals; but even just switching to a turbo we would be able to make more HP (with a different powerband of course) than with the supercharger and more safely because turbochargers have a higher adiabatic efficiency. This makes cooling easier and therefore lowers the risk of preignition and detonation due to high temps at higher boost.

Also, FYI we have a returnless fuel system so we couldn't use an FPR unless we converted.
Thanks NJHK!

 

You're welcome

If you have any other questions, feel free to ask here or PM me.

To further clarify, 22 PSI of boost pressure.

 

Keep in mind there are limitless possibilities....as long as your wallet can keep up. I mean you've seen the cobalt race cars that have been built. They just get SUPER expensive. I'd suggest first making a budget, pricing out some parts for whatever setup you decide to go with and make a plan. It doesn't sound like you're doing the typical "buy and mod" route...this seems to be a full blown project for you. Best of luck.

 

I like the way you think

 

haha, thanks! i've been through enough disaster projects of my own to learn a thing or two. i've also seen a lot of your posts around here...EXTREMELY knowledgeable. when my cobalt becomes a project car, I'll be sure to direct my questions your way.

 

You got it