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Old 03-28-2010, 01:56 PM   #1 (permalink)
My Goal: 35 MPG All Day
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LOD- Most of us know what it is...

I idle in Neutral @ 5-7
Idle in Drive @ 7-8
Accelerate from zero @ around 35
Just driving @ about 18-25


What are some ways I can shrink my LOD besides driving with a lighter foot?


What are others numbers (if you watch that gauge)

Last edited by RandomFact314; 03-29-2010 at 03:34 AM..
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Old 03-28-2010, 09:58 PM   #2 (permalink)
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RandomFact314 -

- Disable/disconnect your alternator
- Convert from power to manual steering,
but only if you don't already have electric steering.
- Remove your AC

My Idle LOD is around 18.

Here is what I think LO(a)D actually is :

OBD II Supported Parameters
Absolute Load Value – indicates a percentage of peak available torque. The normalized value of air mass per intake stroke displayed as a percent.
OBD-II PIDs - Wikipedia, the free encyclopedia


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Old 03-29-2010, 12:53 AM   #3 (permalink)
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Aha! Lift Over Drag! Anything else?
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Old 03-29-2010, 08:32 AM   #4 (permalink)
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Interesting, my idle LOD is more like 30 (though that might be while cold). I accelerate at roughly 80 when P&Ging.

Any mod that reduces the power output necessary from the engine is going to reduce LOD which is really just load.
Current project: A better alternator delete
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Old 03-29-2010, 09:34 AM   #5 (permalink)
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I like to call it effective compression, which is the actual amount of atmospheric pressure in the cylinder at BDC on the compression stroke (although it may be slightly higher due to the inertia of the incoming air at slightly after BDC).

It is directly related to manifold vacuum, with full load enrichment applying an additional effect.

Your best BSFC, as a general rule (certainly with exceptions) is about 1500-2000 RPM with the minimal manifold vacuum, without enrichment.

To the OP, reducing the inefficiency of light load operation is the key component of P&G.

An example is a dyno test of the 4 cylinder (GM 2.5 liter) where the 20 HP load applied used 1 unit of fuel. Increasing the load to 50 HP required 1.5 units of fuel.

20 HP per unit situation A
33 HP per unit situation B

The ideal use of situation B in a P&G scenario would theoretically increase fuel consumption by a factor of 33/20 percentage if that load operation tactic was employed (B).

I would accelerate at higher loads than 35, more like 80, and possible shifting earlier if that was possible, with a manual transmission.

If it is an automatic then you want the highest load that does not keep the transmission in lower gears.


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