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Old 03-26-2011, 10:11 AM   #1
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Default SP & GM motor timing question

Hi,

The SP motors come with adjustable timing 0 - 10 deg with the middle setting being 5 deg so does that mean my GM with fixed timing has 5 deg ? if not how much timing does it have ? I don't understand how different manufacturers timing work on their motors, is there a standard amount of timing they all have ?

Thanks.
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Old 03-26-2011, 10:29 AM   #2
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I do not know how the GM is measured, but I do know how the SP v3 is measured.

First, the endbell marking is WRONG. "Middle" is zero, "0" is -10deg, "+10" is +10deg.

Now, "zero" timing in this case is actually 30degrees mechanical timing, but this is a standard across all the motors as far as I know.

One way of finding zero would be to pull out the sensor cable while the motor is running on a zero-timing profile. If the motor runs slower in sensorless mode, the sensor timing is advanced.

For the SP, I would personally run it in the middle of the slot for timing-advance profiles, and at +10 for zero-timing profiles.
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Old 03-26-2011, 10:37 AM   #3
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Thankyou.
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Old 03-26-2011, 10:37 AM   #4
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Quote:
Originally Posted by digitrc View Post
For the SP, I would personally run it in the middle of the slot for timing-advance profiles, and at +10 for zero-timing profiles.
The norm is to use +10 on the SP V3 motors, as they really come to life at +10. And that is for both boosted and zero-timing.
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Old 03-26-2011, 11:41 AM   #5
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Quote:
Originally Posted by digitrc View Post
I do not know how the GM is measured, but I do know how the SP v3 is measured.

First, the endbell marking is WRONG. "Middle" is zero, "0" is -10deg, "+10" is +10deg.

Now, "zero" timing in this case is actually 30degrees mechanical timing, but this is a standard across all the motors as far as I know.

One way of finding zero would be to pull out the sensor cable while the motor is running on a zero-timing profile. If the motor runs slower in sensorless mode, the sensor timing is advanced.

For the SP, I would personally run it in the middle of the slot for timing-advance profiles, and at +10 for zero-timing profiles.

I have run the SP 4,5 with GM 75 speedo in my Top Rebel , and had a massive improvement , by turning the mecanical timing all the way down on the SP and then give it 3-5 degress more in the speedo. Someway the engines run more smooth with less mecanical timing
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