2005/2006 Stock Mustang GT Tune
08-10-2010, 04:37 PM
#1
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2005/2006 Stock Mustang GT Tune
Here we'll be taking a peek inside the Ford Mustang GT calibration.
As parts of the tune are broken down for presentation, I will add them in the 5 reserved slots below. Topics of interest are WOT ignition timing, WOT cam timing, WOT air/fuel ratios, ignition timing retard/advance (based on knock sensor feedback as well as air,coolant & oil temperatures. And finally, we'll tie everything together to see how at WOT the engine produces the power that it does.
The stock calibration is for 87 octane.
As parts of the tune are broken down for presentation, I will add them in the 5 reserved slots below. Topics of interest are WOT ignition timing, WOT cam timing, WOT air/fuel ratios, ignition timing retard/advance (based on knock sensor feedback as well as air,coolant & oil temperatures. And finally, we'll tie everything together to see how at WOT the engine produces the power that it does.
The stock calibration is for 87 octane.
Last edited by hammeron; 08-12-2010 at 02:44 PM.
08-10-2010, 04:38 PM
#2
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WOT Ignition Timing
Base timing for the 4.6L 3v engine, is 10* Before Top Dead Center.
Here is the WOT ignition timing curve. Maximum timing advance (17.5*), happens at 4750 rpms.
Explanation of timing
Timing refers to when the spark plug fires in relation to the piston's position. Base timing of 10* means that the spark plug fires when the piston is 10* Before Top Dead Center.
Advanced means the spark is happening earlier than base timing.
Retarded means spark is happening later than base timing.
What is the graph telling us?
WOT below 1000 rpms results in spark happening at exactly Top Dead Center. Only after rpms reach 1000 will spark begin to occur before Top Dead Center. The zero line of the chart (in the Y axis) is equal to base timing, which is equal to 10* BTDC.
So there are a couple of ways to define your max timing. One way is to reference to Top Dead Center, in which case total timing would be 27.5*. The other way is to reference to base timing, in which case our timing advance would be 17.5*.
Base timing for the 4.6L 3v engine, is 10* Before Top Dead Center.
Here is the WOT ignition timing curve. Maximum timing advance (17.5*), happens at 4750 rpms.
Explanation of timing
Timing refers to when the spark plug fires in relation to the piston's position. Base timing of 10* means that the spark plug fires when the piston is 10* Before Top Dead Center.
Advanced means the spark is happening earlier than base timing.
Retarded means spark is happening later than base timing.
What is the graph telling us?
WOT below 1000 rpms results in spark happening at exactly Top Dead Center. Only after rpms reach 1000 will spark begin to occur before Top Dead Center. The zero line of the chart (in the Y axis) is equal to base timing, which is equal to 10* BTDC.
So there are a couple of ways to define your max timing. One way is to reference to Top Dead Center, in which case total timing would be 27.5*. The other way is to reference to base timing, in which case our timing advance would be 17.5*.
Last edited by hammeron; 08-12-2010 at 02:23 PM.
08-10-2010, 04:39 PM
#3
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Join Date: May 2006
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Posts: 11,881
WOT Cam timing
Here is the WOT cam timing curve. If you are under 3000 rpms when you go WOT, the cams will start out
at 0 degrees (this means full advance, which is the default position for the cams). At 3000 rpms the PCM will begin to retard the cams, reaching a maximum of 9* retard by 5750 rpms.
Here is the WOT cam timing curve. If you are under 3000 rpms when you go WOT, the cams will start out
at 0 degrees (this means full advance, which is the default position for the cams). At 3000 rpms the PCM will begin to retard the cams, reaching a maximum of 9* retard by 5750 rpms.
Last edited by hammeron; 08-12-2010 at 09:34 AM.
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