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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #1  
Old 01-02-2013, 03:14 PM
klilflipp klilflipp is offline
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2002 Chevy ss clone
Dark Green Metallic 4.2L I6 4X4
Join Date: Jan 2013
Location: waterford,mi
Posts: 2
hp n mileage

What can i do to my 4.2 to gain hp and mileage
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  #2  
Old 01-03-2013, 10:00 AM
limequat limequat is offline
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1987 Non-GMT360 Other
n/a 4.2L I6 2WD
Join Date: Apr 2008
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Quote:
Originally Posted by klilflipp View Post
What can i do to my 4.2 to gain hp and mileage
A tune is the best/easiest.
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  #3  
Old 11-11-2013, 02:04 PM
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brentbarker89 brentbarker89 is offline
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2005 Chevy TrailBlazer LS
Summit White 4.2L I6 2WD
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What does a tune consist of?
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Old 11-11-2013, 03:02 PM
limequat limequat is offline
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1987 Non-GMT360 Other
n/a 4.2L I6 2WD
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Location: Detroit
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Originally Posted by brentbarker89 View Post
What does a tune consist of?
Depends on the Tuner.

I'll enable power enrichment, increase spark timing, reduce torque management, and firm shifts. That's the big stuff, much more depending on what you're after.

http://www.lime-swap.com/tune
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Old 01-08-2014, 10:35 AM
jes91678 jes91678 is offline
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2003 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
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Location: michigan
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Originally Posted by limequat View Post
Depends on the Tuner.

I'll enable power enrichment, increase spark timing, reduce torque management, and firm shifts. That's the big stuff, much more depending on what you're after.

http://www.lime-swap.com/tune
Im near northville, could I bring my TB there and Get it done on the spot or What?
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  #6  
Old 01-08-2014, 12:50 PM
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glfredrick glfredrick is offline
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2003 Chevy TrailBlazer LS
Black 4.2L I6 4X4
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First, realize that there is not much that can be done to improve things a lot. The TB package is already "hot-rodded" from the factory, with high capacity fuel injection, decent air flow, larger than most exhaust, variable cam timing, double-overhead cams, etc. Biggest gains come in three areas:

1. Driver
2. Removing as much stuff that causes weight or external drag (including lowering the vehice) if possible.
3. A PCM tune (I like PCM of NC -- a vendor here on the board)
4. Full synthetic (like Amsoil, not some re-cracked dino oil that still gets thick at cool temps) oil in everything.
5. Tire pressures at the top end of the scale (and also tread pattern designed for highway roll-out)

Do all that stuff and you might find that you gain 2-3 mpg or so.
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