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Chippernut Forums > Shift Light v2.3
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Weird PPR glitch

posted Mar 04, 2016 23:28:36 by krty6
Hi all, having a strange issue with setting my ppr on my set up. I select ppr in the menu and it goes to zero, than when I adjust it I get another number than quickly goes back to zero. I cant seem to get anything besides zero to stick. I did the eeprom reset several times and reinstalled the code and it still does it. this is effecting the PPR setting only everything elts works great. another note I am using a 1.2" display with backpack (the same as the one everyone uses here but the bigger version) and I am running 32 leds.
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2 replies
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BrandonMatthews said Mar 05, 2016 04:56:24
Read the instructions for the shift light. It reads as follows:

7."PPr" - Pulses Per Revolution
a. Essentially this is the "Engine Size" selector switch found on most aftermarket tachometers - only with more flexibility.
b. Ranges from 1 to 32. Though typically:
i. 4-cylinder engine = 2 PPr
ii. 6-cylinder engine = 3 PPr
iii. 8-cylinder engine = 4 PPr
c. This will vary depending on manufacturer, engine size, application, aftermarket engine control systems, type of ignition systems, and other factors. Do determine which application is correct for you: Google.
d. This option will display the read RPM until the rotary encoder is turned - then it will display the PPr selected for 500ms, then back to the new RPM reading. This should give you a frame-of-reference when adjusting this setting.
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Jonduino said Mar 05, 2016 17:51:52
Hi krty6,

This option will display the read RPM until the rotary encoder is turned - then it will display the PPr selected for 500ms, then back to the new RPM reading. This should give you a frame-of-reference when adjusting this setting.


When adjusting the PPR, it will switch back and forth between the PPR value and the RPM. (It's meant to be adjusted while the engine is running) -- so if it's not sensing an RPM, it will always go back to zero. If that makes sense?

Hope this helps
- jon
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