2006 Cobalt SS makes 270 WHP!
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Former Vendor
Joined: 12-13-05
Posts: 97
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From: Westerville OH
2006 Cobalt SS makes 270 WHP!
We finally got our hands on Rob’s new Cobalt SS for the first time last night, and let’s just say that we all had a little FUN. 
After several hours of testing with different supercharger pulleys, fuel injector sizes and air/fuel adjustments, we were able to achieve 270 WHP on 92-octane pump gas, with 18” wheels and a complete exhaust system.
Current mods include:
- INTENSE modular supercharger hub with 2.80” pulley - $129.99 (part numbers LSJ-IMH-090 and LSJ-IMP-280)
- Lucas 42.5 pound/hour fuel injectors - $159.99 (part number LSJ-FIS-425-4)
- Casper’s fuel injector connectors - $29.99 (part number LSJ-CIC-012-4)
- MAF Translator - $179.99 (part number LJS-FTS-MAFT)
- Autolite 3922 spark plugs - $7.96 (part number LSJ-ASP-3922 x 4)
- Catalytic converter removed – N/A (not sure how important this is, since the stock converter seems to flow pretty well)
Total parts cost = $507.92
Hoosier Performance (central Indiana) or INTENSE-Racing (central Ohio) will install the above package in about two hours (excluding the catalytic converter removal) for an additional $150.00.
Here’s the dyno chart for our final tune:
Boost ranged from 14 to 17 psi, increasing linearly with engine speed all the way to the 6,500 RPM rev limiter. Quite a bit more horsepower should be available as soon as we get a good exhaust system installed.
Wide band air/fuel ratio for the final tune ranged from 11.3:1 to 12.7:1. The air/fuel curve is OK and safe, but certainly no where near as nice and powerful as we’ll be able to make it once we get access to the PCM code.
Peak horsepower was 270 WHP at 6,500 RPM. Peak torque was 237 WTQ in the 4,800 RPM range. Using the industry standard of 15% drivetrain loss for a FWD manual tranny, this works out to 317 horsepower and 279 foot-pounds of torque at the crankshaft. Very impressive for 2.0 liters of engine!
Side effects of the above combination include the following:
1. You’ll need a special tool to remove your stock supercharger pulley, and install the new modular hub.
2. You’ll want to invest in some sort of scan gauge to monitor KR and have a better understanding of everything when you run this much boost.
3. The fuel injector connectors (eight wires) and MAF Translator (6 wires) must be soldered in at this time. It will be a while longer before we’re able to source all the nice plug and play connectors required for these cars, but we’re working on these now.
4. Although the very cool stock hydraulic belt tensioner does a fine job of taking up the extra belt slack, the more correct way to do this would be with a smaller belt. We’re trying to source this now, and plan to have it available at some point in the future.
The most exciting thing for us is that there’s still TONS more potential in this little powerplant. Some of the next things we plan to address include the exhaust system, induction system, a machined supercharger snout to allow a smaller supercharger pulley, PCM tuning and a few other fun things.
After several hours of testing with different supercharger pulleys, fuel injector sizes and air/fuel adjustments, we were able to achieve 270 WHP on 92-octane pump gas, with 18” wheels and a complete exhaust system.
Current mods include:
- INTENSE modular supercharger hub with 2.80” pulley - $129.99 (part numbers LSJ-IMH-090 and LSJ-IMP-280)
- Lucas 42.5 pound/hour fuel injectors - $159.99 (part number LSJ-FIS-425-4)
- Casper’s fuel injector connectors - $29.99 (part number LSJ-CIC-012-4)
- MAF Translator - $179.99 (part number LJS-FTS-MAFT)
- Autolite 3922 spark plugs - $7.96 (part number LSJ-ASP-3922 x 4)
- Catalytic converter removed – N/A (not sure how important this is, since the stock converter seems to flow pretty well)
Total parts cost = $507.92
Hoosier Performance (central Indiana) or INTENSE-Racing (central Ohio) will install the above package in about two hours (excluding the catalytic converter removal) for an additional $150.00.
Here’s the dyno chart for our final tune:
Boost ranged from 14 to 17 psi, increasing linearly with engine speed all the way to the 6,500 RPM rev limiter. Quite a bit more horsepower should be available as soon as we get a good exhaust system installed.
Wide band air/fuel ratio for the final tune ranged from 11.3:1 to 12.7:1. The air/fuel curve is OK and safe, but certainly no where near as nice and powerful as we’ll be able to make it once we get access to the PCM code.
Peak horsepower was 270 WHP at 6,500 RPM. Peak torque was 237 WTQ in the 4,800 RPM range. Using the industry standard of 15% drivetrain loss for a FWD manual tranny, this works out to 317 horsepower and 279 foot-pounds of torque at the crankshaft. Very impressive for 2.0 liters of engine!
Side effects of the above combination include the following:
1. You’ll need a special tool to remove your stock supercharger pulley, and install the new modular hub.
2. You’ll want to invest in some sort of scan gauge to monitor KR and have a better understanding of everything when you run this much boost.
3. The fuel injector connectors (eight wires) and MAF Translator (6 wires) must be soldered in at this time. It will be a while longer before we’re able to source all the nice plug and play connectors required for these cars, but we’re working on these now.
4. Although the very cool stock hydraulic belt tensioner does a fine job of taking up the extra belt slack, the more correct way to do this would be with a smaller belt. We’re trying to source this now, and plan to have it available at some point in the future.
The most exciting thing for us is that there’s still TONS more potential in this little powerplant. Some of the next things we plan to address include the exhaust system, induction system, a machined supercharger snout to allow a smaller supercharger pulley, PCM tuning and a few other fun things.
Senior Member
Joined: 12-07-05
Posts: 964
Likes: 0
From: Indianapolis
All i can say now is that the car is a BEAST!!!! Anything less than 60mph results in wheelspin! 
5th gear on the road at 75mph, floor it, w/o downshifting, it will set you back in the seat!
Look for more BIG news coming soon!
Thanks to INTENSE, and my racing buddies for thier help so far. Not like it took much work though
5th gear on the road at 75mph, floor it, w/o downshifting, it will set you back in the seat!Look for more BIG news coming soon!
Thanks to INTENSE, and my racing buddies for thier help so far. Not like it took much work though
Former Vendor
Joined: 12-12-05
Posts: 281
Likes: 0
From: Westerville, OH
It was a great time working with this car. The best part of the night was canabalizing my car for 4 of its injectors to try in Rob's Cobalt. Nothing like swapping injectors in the dark and 12 degrees out 
Great numbers Rob! I can only image what the drive home was like.
Great numbers Rob! I can only image what the drive home was like.
360 L337 User
Joined: 08-11-05
Posts: 7,454
Likes: 0
From: Philadelphia, Pa
Is there anyone that can do this closer to me. man Would that be sweet. As Soon as this is plug and play I guess I'll do it myself.
After stage reflash when it can be reversed easily. I'll be on it. I only want 300whp then I may stop.
How long would it take to install?
After stage reflash when it can be reversed easily. I'll be on it. I only want 300whp then I may stop.
How long would it take to install?