Has anyone come out with a turbo Kit for this vehicle yet?

How about the 2.2? Sister has the smaller version engine which has just as much potential!

Hahn Racecraft just introduced one for the Cobalt 2.4. You might give them a call and ask if the HHR is on the map. Same engine, but there could be some minor differences in clearance issues, etc.

Cool deal man. Thanks for the info. I have been in talks with them anyways since I just got a turbo kit for my Solstice. I think I may call my rep over there and see what we might have coming out for our cars!

No turbo kit for either motor as of yet like they said but if you really wanted to get ballsy, you could do your own custom experiment. You'd of course have to go standalone and I don't know how comfortable you are with boosting a new car.

Very comfortable. I boosted my xB and Solstice within 10 grand in miles in each. Warranties are worthless now-a-days for the most part anyways. Not really wanting to mess with building up one myself anymore. Getting to old. Just wanna go out and bolt on one that has already had the R&D done on it.

like was said above, Hahn Racecraft has released a stage 2 kit for the 2.4 Cobalts. However, pipe fitment and intercooler placement is the only real thing you would have to modify. HPTuners has a tuning program out that will hack the 2.4 computer. Its not cheap but if you don't want to go standalone then this is the way to go. Try www.HPTuners.com and look for the info for the 2.4 cobalt. Same engine, same computer.

Let me just step in and say a few things about this subject. The HP Tuners kit runs $500 for the software, and you need a laptop. Although the software is available, there is no "tune" per se for the HHR (specifically) - each individual user will have to "play around" with the hundreds of various settings to acheive this. It can be a good thing, but if you are not well versed in:

Adaptive Idle RPM
Stall Savers
PID Delays
Injector Control
Fuel Cutoff
Enrichment Rate
Piston Protection
Transient Fuel
Knock Sensor Levels
Minimum Spark Advance

You have a good chance of making several incompatible settings, the results of which could ruin your HHR's driveability. Here's an example of the adjustable parameters for setting dynamic airflow for wide open throttle:

Dynamic Airflow

WOT Entry Max Airflow: If yes then set predicted airmass to ideal (maximum) cylinder airmass when entering WOT (Zone #1).
MAP/TPS Airflow Filter: This filter is used to filter the MAF airmass in response to a MAP or TPS failure. It is also used to filter the MAF airmass when the engine RPM is greater than the High RPM Disable limit.
High RPM Disable: Above this RPM use filtered MAF airmass for airmass prediction calculations.
High RPM Hysteresis: Hysteresis subtracted from High RPM Disable to re-enable dynamic airmass calculation.
Initial Zone: Zone is initialized to this value when engine is started.
WOT Zone - TPS %: Throttle position greater than or equal to this value is regarded as WOT and sets zone to #1 (WOT Zone).
Idle Zone - VSS: Vehicle speed must be below this to set Idle Zone (zone #2).
Idle Zone - TPS %: Throttle position speed must be below this to set Idle Zone (zone #2).
Zone RPM Boundaries: RPM boundaries that define different zones (horizontal boundaries).
Zone RPM Hysteresis: Hystersis applied to RPM zone transitions to prevent oscillation between zones.
Zone MAP Boundaries: MAP boundaries that define different zones (vertical boundaries).
Zone MAP Hysteresis: Hystersis applied to MAP zone transitions to prevent oscillation between zones.
Maximum Limit Factor:
Deep Decel - MAP: Below this MAP activates deep decel strategy and enables steady state.
Dynamic Air Filter: Filters the current airmass value before prediction filtering. If in steady state the current airmass value is MAF based, if in unsteady state the current airmass is VE based (using an offset based on the last calculated VE Correction Factor).
EGR Test Disable Time: Time to disable dynamic airmass calculation after an EGR test.
Cranking to Run Time: Time to transition and ramp from cranking airmass to dynamic airmass calculations.

Those are a lot of interacting parameters to adjust to properly change the dynamic airflow rate at wide open throttle.

Here's another example; the fuel system and rev limiters on the HHR are both in control of the maximum allowable rpm of the engine. (*the rev limiter shuts of at one rpm, and the fuel system has a safety shutoff at another.) So if someone decides to raise their "redline" rpm just a bit, and then runs into the fuel shutoff range, it becomes a recipe for disaster.

If it sounds complicated, that's because it is. (*And we haven't even gotten into the transmission settings yet!)

As they say on their site:

"• Hundreds of editable parameters"

You had better know what you want to modify and how that affects the rest of the Engine Management system! This type of program is best left in the hands of a professional who performs these tunes daily (like TuneTime Performance, one of our vendors), rather than an HHR owner who is "guessing" to try and tune his vehicle. Instead of enhancing performance, one might end up with a vehicle that has very poor driveability and even destroying their engine.

We have been working with manufacturers for nearly a year to bring a hand-held programmer to market. One with simple "yes/no" confirmations and a fixed set of parameters for power enrichment, rev limiting, shift firmness, etc. These programmers offer a range of safety to owners, since the parameters have lab-proven compatibility, and eliminate oddball choices. Developing these units takes time, but it's really the way to go for the do-it-yourselfer.

The HP Tuner method can net some great results, but only if performed by a knowledgeable technician who is well-versed in the parameters and their functions.

Yes if i went threw there set-up I would be taking it to a tuner shop to use the program to get it all up right.

i would just wait until next year there will be a kit for the sky and it's the same motor

before then they'll have the 2.4 turbo for the cobalts check out cobaltss.net they have a 2.4 putting around 334hp on a stock motor theres alot of info just waiting but i dont like turbos or sups or noz.........sorry not my cup of tea

Well if u are going for fastest HHR on the Site then u are gonna have to be forced production of some sorts.

before then they'll have the 2.4 turbo for the cobalts check out cobaltss.net they have a 2.4 putting around 334hp on a stock motor theres alot of info just waiting but i dont like turbos or sups or noz.........sorry not my cup of tea

FYI: Hahn does not recommend that you should be doing such on stock internals.

FYI: Hahn does not recommend that you should be doing such on stock internals.
:confused:
I thought it was an Ecotec 'claim to fame' that it could handle sooooo much more that stock output? Don't get me wrong, I know their not putting forged internals in these things, but I thought that was the purpose of that Bonniville racer (that rolled)... to show the masses what this little Ecotec could do!?!?!? Just curiuos why Hahn would be saying such a thing... unless it's a little "C.Y.A." (disclaimer) on their behalf.

ok fastes NA on site is that better?

:confused:
I thought it was an Ecotec 'claim to fame' that it could handle sooooo much more that stock output? Don't get me wrong, I know their not putting forged internals in these things, but I thought that was the purpose of that Bonniville racer (that rolled)... to show the masses what this little Ecotec could do!?!?!? Just curiuos why Hahn would be saying such a thing... unless it's a little "C.Y.A." (disclaimer) on their behalf.


Chevy claims the bottom end of the ecotecs to be good for 250 hp or torque I forget. But there are some guys making decent power with a stock bottom end upwards of 250 and into 300. However they may just be darn lucky or have serious supporting mods. Chevy's statement as well as Hahn's could be CYA statements but should be heeded the same.

:confused:
I thought it was an Ecotec 'claim to fame' that it could handle sooooo much more that stock output? Don't get me wrong, I know their not putting forged internals in these things, but I thought that was the purpose of that Bonniville racer (that rolled)... to show the masses what this little Ecotec could do!?!?!? Just curiuos why Hahn would be saying such a thing... unless it's a little "C.Y.A." (disclaimer) on their behalf.

They say this cause...well...imagine if you were them.

You have a 4 cylinder, 2.4 motor that was not meant for boost or the levels you're pushing it but you say "yes, it can handle 350 HP on stock internals". 6 months later, you have people calling you and complaining "my motor blew up!".

It's smart on their behalf. Yeah, they are pushing it now but for how long can it handle it is the real question.

As soon as you put too much boost to the stocker, the plastic intake manifold will split anyway. Ask the Cobalt guys - they have already been there.

FYI: Hahn does not recommend that you should be doing such on stock internals.

He sure is having fun with the 2.4 in his Solstice! He has his Stage 4 kit on it and almost at 400 horses to the ground on all factory internals. I am waiting for him to perfect that kit to order for my Solstice. Might just have to get with him and get him working on a HHR kit!

As soon as you put too much boost to the stocker, the plastic intake manifold will split anyway. Ask the Cobalt guys - they have already been there.

Where did you hear this?

I've held the plastic manifold in my hand and it's not some flimsey item. It's pretty solid, so claiming that it will crack seems very silly to me, especially cause I know plenty of j-body guys who are running boost on their stock intake manifolds and nothing has happend.

Also remember that GM claims that your plastic manifold can FLOW good up to 300 HP...i'd say you'd need a good amount of boost to reach this mark.

i would just wait until next year there will be a kit for the sky and it's the same motor

If that is correct, then the Solstice kit would work since both the Solstice ans Sky are based off the Same exact 2.4 motor. And the Solstice already has a turbo out for it.