Max Low End Torque Tune......

[Mark_in_Tulsa]

Ok I have seen some of you guys get your tunes for Max Low End or Economy or full out race performance tune.

Those 3 tunes are the ones I have seen the most on this board.

With picking any of those 3 will you see a MPG increase?

Will there be an increase in performance in the Econo tune?

 

But my main question is what do they tune differently between a max low end torque vs all out performance. I would think since these are 5000+ lbs trucks that max low end torque would be a requirement for all out performance, since it takes a lot to get these 5000+ shaped bricks to get going.

 

I'm a carpet installer so I always have 2000+ in my bed. So I would want my main increase to be in low end grunt. But by doing so does that sacrifice my high end HP?

[Mark_in_Tulsa]

*cough*

[vhato]

*cough*

 

<{POST_SNAPBACK}>

 

 

 

 

Your gonna get all kinds of replies.

 

In my experience, PCM Tuners and Handheld Programmers tune the engines to run with an air/fuel mixture of 12.9:1 instead of the factory 14.7:1. This means more fuel is used to get you the extra power.

 

If you want better fuel economy you need to be around 16-17:1 Air/Fuel Ratio which sacrifices performance alot, but can really bring up the mileage. I have heard of 3 "REAL" Miles more per galllon. However, possible Catalytic Converter damage is very likely.

 

The GM PCM has a "hidden, turned off" feature called Lean Cruise. This allows the computer to bascially increase Fuel Economy when maintaining a constant speed like on the Interstate, but may damage the Catalytic Converters. It allows you to have a high performance tune and a gas mileage tune at the same time. It is not legal to use, so many tuners won't touch it.

 

So, for the most part, a performance tune should get the same or worse gas mileage, even though many people will argue they are getting 3 MPG better and 30 more horsepower.