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View Poll Results: What gauge do you use most
Fuel System Loop Status 0 0%
Manifold Absolute Pressure/Boost 1 3.33%
Instant Fuel Economy 23 76.67%
Throttle Position Sensor 10 33.33%
Temperatures 15 50.00%
Average Fuel Economy 22 73.33%
Intake Air Pressure 0 0%
Engine Loading 12 40.00%
Fuel Pressure 1 3.33%
Ignition Timing 2 6.67%
Multiple Choice Poll. Voters: 30. You may not vote on this poll

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Old 09-30-2011, 05:28 PM   #31 (permalink)
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Originally Posted by CigaR007 View Post
For some reason LOD never goes over 84-85 on my car.
I'm still not convinced on what LOD is or how it helps.

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Old 09-30-2011, 05:45 PM   #32 (permalink)
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So I just need to eyeball the engine loading then?

Also, if I hit 99 LOD with the accelerator half depressed, what happens when I continue to press the pedal?
It means you've removed the throttle as the biggest restriction in the system. The intake, air filter, valves and/or something else are holding it back.

It also means you need to back off the throttle. Most fuel-injected cars enrich the mix at full throttle, putting in extra fuel that doesn't burn. That extra fuel is wasted.
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Old 09-30-2011, 05:48 PM   #33 (permalink)
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Quote:
Originally Posted by Arragonis View Post
I'm still not convinced on what LOD is or how it helps.
LOD can be equated to (or calculated from) manifold vacuum. It points you to where on the bsfc chart you are, so you can run the engine at its most efficient point.
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Old 10-01-2011, 02:01 PM   #34 (permalink)
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Originally Posted by MPGranger View Post
Also, if I hit 99 LOD with the accelerator half depressed, what happens when I continue to press the pedal?
It burns more fuel, but won't help much.

On my diesel car, acceleration isn't faster beyond 98-99 LOD.
Climbing, 99 LOD is the end.
Pushing further doesn't increase speed any more.

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