Who has a COBB?

[Tcnarber]

For those who have made the jump, what are your thoughts? How easy to set up? What gains have you noticed? Any increase/decrease in MPG?

Did COBB say when the next stages would be available?

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[OVRKILL]

There are a few review threads up on this subforum already, but I can offer some thoughts. I have about 1100 miles on mine so far.

Very easy setup, just put the car on a float charger, plug in and press the button, then wait 30 minutes.

Overall mileage increased by 4mpg with 50/50 city/hwy.

The car runs 0.4 closer to stoich on average but the stock cooling system can handle it, of course I have the performance pack w/ larger radiator. I haven't checked EGT readings yet.

Throttle mapping is more aggressive so it's a bit twitchy at low speeds. Flat-foot shifting near redline on the high boost map is definitely an experience.

 

[DanFish]

What do you mean it's running .4 closer to stoich?

 

[neodark]

What do you mean it's running .4 closer to stoich?

Stoichiometry http://en.wikipedia.org/wiki/Stoichiometry he's talking about AFR. That said, I don't know if the larger radiator will be that beneficial... From all the research posts here, this car would benefit more from a larger FMIC.

 

[wireless]

I have only had mine for ~150-200 miles or so.

Setup was easy. Shifts are a bit firmer in Sport (auto) and they're OEM-esque in "D."

Took forever to download the stock tune. Plug it in, start it, and walk away for 10 minutes or so. I got a tour of Cobb's shop while it was flashing and it still didn't finish. Lol

The active map switching is awesome. I find myself using it, but I sit on Economy. It's nice, and when I switch back to the high perf map I'm going to be happy.

Throttle map is different. It depends on the map. Very nice.

 

[OVRKILL]

What do you mean it's running .4 closer to stoich?

The air/fuel ratio hovered around 13.6 prior to the tune, now it's around 14 or higher. The computer's target AFR is now 14.7, which is about as lean as you can go for gas. The car is injecting less fuel for a particular amount of air, resulting in a leaner, more complete, and hotter combustion event.

Stoichiometry http://en.wikipedia.org/wiki/Stoichiometry he's talking about AFR. That said, I don't know if the larger radiator will be that beneficial... From all the research posts here, this car would benefit more from a larger FMIC.

I'm most concerned about head and exhaust temps when the car is running a bit lean. Lowering the charge temp will certainly help with heat management but flowing too much air without a tune to match could cause things to get a bit melt-y.

 

[mizer67]

The air/fuel ratio hovered around 13.6 prior to the tune, now it's around 14 or higher. The ECM's target AFR is now 14.7, which is about as lean as you can go for gas. The car is injecting less fuel for a particular amount of air, resulting in a leaner, more complete, and hotter combustion event.



I'm most concerned about head and exhaust temps when the car is running a bit lean. Lowering the charge temp will certainly help with heat management but flowing too much air without a tune to match could cause things to get a bit melt-y.

What's the factory ECM's target AFR vs. the Cobb at 14.7?

 

[OVRKILL]

I honestly don't remember, but if anyone's interested, I have a good datalog post-tune. Let me know if you're interested in specific readings.

https://drive.google.com/file/d/0B20yOMX7IroKR05HZjZhWl9LcEU/view?usp=sharing

 

[neodark]

I'm most concerned about head and exhaust temps when the car is running a bit lean. Lowering the charge temp will certainly help with heat management but flowing too much air without a tune to match could cause things to get a bit melt-y.

Interesting... Where are you getting those temps, the built-in gauges? what are they called in the display?

 

[OVRKILL]

The head temp is visible under 'gauges' from the main menu, but I also have my accessport set up to monitor various things. Haven't poked around to find EGTs yet.

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