4-tooth trigger wheel spark accuracy test survey - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-29-2014, 01:51 PM   #1
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Default 4-tooth trigger wheel spark accuracy test survey

Here's a good test for spark accuracy during engine acceleration.

Set spark angle to some fixed value in the software. Use a timing light. Idle the motor. Look at timing. Blip the throttle sharply. At the instant revs begin to rise, is usually the worst case for spark accuracy. The error usually diminishes as revs rise, so you have to do it a few times with a sharp eye to capture the worst error. Helps to paint the mark white with whiteout.

For the 4-tooth factory trigger wheel, the worst case fixed timing to set it to in the software is just before 10* BTDC, such as 15* BTDC. This is because one of the teeth is at 10* BTDC and setting it to 10* BTDC means the software can time off of a tooth that just occurred. At 15* BTDC it has to time off of the earlier tooth (70* BTDC IIRC).

Could some of you guys try this and report back?

With the AEM and factory wheel I get 5* of error. With the TSE 12+1 wheel I can barely read any. (<0.5*)
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