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Tuning for fuel mileage ?s.

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Old Jul 10, 2006 | 10:08 PM
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Default Tuning for fuel mileage ?s.

Looking for some general info. how to tune for fuel mileage, what to do, what to look for, ect. I thinking of putting a restrictor plate on, reducing the incoming air, which would require less fuel. Is this possible?

Thanks.
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Old Jul 10, 2006 | 11:04 PM
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... and what is it you drive?
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Old Jul 11, 2006 | 04:41 PM
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Thinking of putting a D.O.D engine in a Fox body Mustang.
Thanks.
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Old Jul 11, 2006 | 05:13 PM
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restrictor plate will increase vacuum.

Vacuum is BAD for fuel economy, as you have pumping losses.

Things that help fuel economy.

Timing, locked torque converter, and EGR are just a few.

Ryan
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Old Jul 11, 2006 | 09:06 PM
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Originally Posted by slow
restrictor plate will increase vacuum.

Vacuum is BAD for fuel economy, as you have pumping losses.

Things that help fuel economy.

Timing, locked torque converter, and EGR are just a few.

Ryan
What kind of timing, lower or higher?
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Old Jul 13, 2006 | 08:31 AM
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Lower the O2 switch points for your cruising airflow/rpm.
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Old Jul 13, 2006 | 09:55 AM
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1. Go to Home Depot.

2. Purchase 2x4x4 block of wood.

3. Return to car and place block of wood behind gas pedal.

Congratulations! You should now see a 5~50% increase in gas mileage.



Hmmm...I should do one of those 2am infomercials and sell blocks of wood for $19.95 + $5.95 shipping and handling.
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Old Jul 13, 2006 | 11:46 AM
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Originally Posted by muncie21
Lower the O2 switch points for your cruising airflow/rpm.
I read Jimmy's thread on the HPT forum about that a while back... how do you determine which airflow mode corresponds to which driving condition?
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Old Jul 13, 2006 | 11:58 AM
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I'd tweak TC lockup first
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Old Jul 13, 2006 | 01:06 PM
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Originally Posted by SMOKINV8
I read Jimmy's thread on the HPT forum about that a while back... how do you determine which airflow mode corresponds to which driving condition?
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Old Jul 13, 2006 | 01:32 PM
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Originally Posted by SMOKINV8
I read Jimmy's thread on the HPT forum about that a while back... how do you determine which airflow mode corresponds to which driving condition?
Go for a drive and log dynamic air in g/sec. Figure out what that is during steady state cruise. Once you have the g/sec range (for example: 28-44 g/sec) that you run in during cruising adjust your O2 switch point accordingly.

There are only 9 airflow modes that can be selected in the rich/lean airflow mode table. I selected 2 modes to be my lean cruising settings and dropped the switchpoints in those areas to 3xx mv.
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