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  #121  
Old 02-10-2012, 08:33 AM
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Re: 3.7l performance love

Quote:
Originally Posted by 05WK View Post
Did you ask about where they got the hp/tq for that liberty? Since we have the same engine those numbers appear wrong
FYI.

I'm assuming the #'s Jeep posts are from using a engine dynamometer, and the #'s Hypertech posted are using the chassis dynamometer.

Stock HP according to Jeep is 210 HP.
Hypertech shows stock tuning at 159 HP.

Which is about a 25% decrease, and is mentioned below that chassis dyno power and torque measurements are lower than engine dyno numbers by roughly 10% to 20%, or more in some cases.

So the #'s do look fairly legit. We shall see if my butt dyno can tell a difference once installed.

http://hypertech.com/PerformanceGrap...ishi_52501.pdf

--------------------------------------------------------------------

There are two (2) different dynamometers for measuring power increases, and their measurements are a bit different.

One type is an engine dynamometer which measures the power and torque of an engine on a stand outside of the vehicle. This is typically done in a facility that has a separate room just for the engine stand and dynamometer setup. The engine dyno measures exactly what the power and torque coming from the engine is at all of the RPM points. Engine Dyno numbers are what vehicle OEM’s quote for power.

The other type is a chassis dynamometer which measures power and torque at the tires during the RPM sweep. The power measured at the tires on a chassis dyno does not account for the power lost through the spinning of the drivetrain (transmission, driveshaft, differentials, axles, wheels, and tires). Because of this, chassis dyno power and torque measurements are lower than engine dyno numbers by roughly 10% to 20%, or more in some cases. The benefit is that the chassis dynamometer shows the true power that a vehicle is putting to the ground.
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  #122  
Old 02-10-2012, 10:07 AM
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Re: 3.7l performance love

Word, I gotchya
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  #123  
Old 02-10-2012, 10:55 AM
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Re: 3.7l performance love

Are there any 07+ 3.7 guys looking for ported TBs? Looking to sell some plastic TBs.
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  #124  
Old 02-10-2012, 01:32 PM
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Re: 3.7l performance love

I didn't know the 07+ were plastic.
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  #125  
Old 02-10-2012, 01:48 PM
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Re: 3.7l performance love

Yup, plastic and fly-by-wire instead of cable driven like the 05-06 aluminum tb's.
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  #126  
Old 02-10-2012, 07:29 PM
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07-10 3.7s, 3.8s, 08-10 4.7s, and vipers all use plastic TBs.
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  #127  
Old 02-10-2012, 09:11 PM
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Re: 3.7l performance love

Wow. I new about the wire but I didn't know they were plastic.


By the way....I totally did like a 4 second squeal pulling into traffic moments ago with a 3.7 liter engine and 32" mud tires. Smoke and all. Unintentionally.
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  #128  
Old 02-12-2012, 11:00 AM
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Re: 3.7l performance love

Fastman ported throttle body to be installed shortly, and the Hypertech Max Energy Programmer was just ordered.

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  #129  
Old 02-12-2012, 11:04 AM
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Re: 3.7l performance love

You're going to love that TB. I do. Idles pretty damn good.
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  #130  
Old 02-12-2012, 11:11 AM
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Re: 3.7l performance love

I know can't wait to test it out.
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  #131  
Old 02-12-2012, 11:29 AM
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Re: 3.7l performance love

Do you have a CAI?
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  #132  
Old 02-12-2012, 11:36 AM
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Re: 3.7l performance love

Yes I do. Removed the 3.7 air resonator box as well.
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