JET Performance
Thread Starter
JK Enthusiast
Joined: Apr 2008
Posts: 119
Likes: 0
From: Scottsdale, AZ
JET Performance
I've installed an AirRaid CAI and my Jeep is already doing better. I'm now looking into the JET performance chips, but there's two stages. Stage 1 doesn't require 91 Octane fuel but Stage 2 does...I want the stage 1 because of the high gas prices, and both stage chips say about a 25 HP gain.
If I get the stage 1 chip, what kind of HP gain do you think I'll really get if the Stage 2 is a definite 25HP when using 91 octane? I'm looking at the stage 1 because I want to keep using 87 or 89 fuel because of the gas prices.
And feel free to add more info and comments.
If I get the stage 1 chip, what kind of HP gain do you think I'll really get if the Stage 2 is a definite 25HP when using 91 octane? I'm looking at the stage 1 because I want to keep using 87 or 89 fuel because of the gas prices.
And feel free to add more info and comments.
JK Freak
Joined: Jan 2008
Posts: 622
Likes: 1
From: Waterford, MI
I've never heard good things about JET.
For the record I used to tune computers on my Subaru WRX and learned quite a bit about it. I believe the JET "chip" just intercepts sensor signals and sends false signals to the stock PCM to get it to increase/decrease injector pulse width. It probably manipulates the throttle position sensor and MAF/MAP sensor signals. It's not a very sophisticated system.
The hypertech will actually reprogram your PCM. However on a modern fuel injected normally aspirated engine that is running standard octane there is not a lot of room for improvement. They might be able to run a little richer here, or a little leaner there. They might be able to get a degree more timing in a few areas. But you'll be lucky to pick up a couple of peak horsepower at the top of the curve, and probably nearly nothing in the meat of the curve. My guess is that the most improvement you'll get is by the remapping of the drive by wire throttle that will result in better driveability and a percieved performance increase.
Now on a turbocharged application, reprogramming can get you significant gains as the factory usually is very conservative with their boost control. That's why turbo diesel trucks, WRX's, Evos etc can pick up some decent horsepower.
For the record I used to tune computers on my Subaru WRX and learned quite a bit about it. I believe the JET "chip" just intercepts sensor signals and sends false signals to the stock PCM to get it to increase/decrease injector pulse width. It probably manipulates the throttle position sensor and MAF/MAP sensor signals. It's not a very sophisticated system.
The hypertech will actually reprogram your PCM. However on a modern fuel injected normally aspirated engine that is running standard octane there is not a lot of room for improvement. They might be able to run a little richer here, or a little leaner there. They might be able to get a degree more timing in a few areas. But you'll be lucky to pick up a couple of peak horsepower at the top of the curve, and probably nearly nothing in the meat of the curve. My guess is that the most improvement you'll get is by the remapping of the drive by wire throttle that will result in better driveability and a percieved performance increase.
Now on a turbocharged application, reprogramming can get you significant gains as the factory usually is very conservative with their boost control. That's why turbo diesel trucks, WRX's, Evos etc can pick up some decent horsepower.
JK Enthusiast
Joined: Oct 2007
Posts: 452
Likes: 0
From: White Plains, MD
Jet Chips
You'll hear many opinions on this, and I guess you could say it's controversial..... I've had the Stage 1 and love it, and now have the stage 2 and love it. It seems to give more power, but the main reason I like them is because my JK shifts more smoothly now and runs at lower rpms at higher speeds. bottom line for me...... when i took the chip out (before installing the second one) i could feel the difference.