Best Mods for $300 to increase HP and Gas Mileage

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09-29-2008, 01:37 PM

#41

shoeys08dkcandygt

4th Gear Member

Join Date: Jul 2007

Location: TN

Posts: 1,895

Quote:

Originally Posted by Vapour Trails

I have 3 tunes from Bama, 87 performance, 91 torque & 93 race.

In terms of fuel economy, 87 > 91 > 93. The 93 Race absolutely sucks the fuel down.

Bottom line is more power, more fuel consumption.

AMEN to that.

09-29-2008, 02:26 PM

#42

Norm Peterson

6th Gear Member

Join Date: Feb 2007

Location: state of confusion

Posts: 7,635

Quote:

Originally Posted by Derf00

That and you can't increase HP output (power) without inputting more energy (gas). Basic laws of physics.

Not entirely true, since the OE tune is not really optimized for either one (OE's also have to consider something called "durability"). Under some conditions, leaning out the fuel delivery a little and advancing the ignition timing a little can give you more of both. You typically pay for this in the need to run higher octane fuel and/or accept a little less cushion against things like spark knock and possibly catalytic converter life with respect to increased exhaust gas temperature.

Norm