VR Conditioner: Difference between revisions
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VR (Variable Reluctance) Conditioners take the semi-sinusoidal signal generated by VR sensors and outputs a (typically) 5v square wave that can be interpreted by modern ECUs. There are many variants, including hardware built into ECUs, add-in boards, and OEM standalone styles. | VR (Variable Reluctance) Conditioners take the semi-sinusoidal signal generated by VR sensors and outputs a (typically) 5v square wave that can be interpreted by modern ECUs. There are many variants, including hardware built into ECUs, add-in boards, and OEM standalone styles. These are not needed for Hall or Optical sensors as those generate square waves natively. | ||
== Discrete == | == Discrete == | ||
"Discrete" conditioners generally use specific components to build-out a signal filter to generate the needed wave form. | "Discrete" conditioners generally use specific components to build-out a signal filter to generate the needed wave form. | ||
=== | === uaEFI === | ||
==== mck1117 vr-interface ==== | ==== mck1117 vr-interface ==== | ||
Based on the lm1815, open source | Built in "discrete" input. Based on the lm1815, open source | ||
https://github.com/mck1117/vr-interface/tree/master | https://github.com/mck1117/vr-interface/tree/master | ||
== MAX9924/9926 == | == MAX9924/9926 == | ||
Many VR Sensors are based on the ICs created by Analog Devices / Maxim Integrated. | Many VR Sensors are based on the ICs created by Analog Devices / Maxim Integrated. 24 is single channel, 26 is dual channel. | ||
[[File:MAX9924 Diagram.png|thumb|MAX9924 Circuit Diagram]] | |||
=== uaEFI === | |||
[[File:MAX9924 Diagram.png|thumb|MAX9924 Circuit Diagram]]Built in 'VR2/Hall' input | |||
== "JDM" Conditioner == | == "JDM" Conditioner == | ||
Typically contains special hardware to handle the "weird" signals of certain Japanese crank sensors common on Toyotas and Hondas. | Typically contains special hardware to handle the "weird" signals of certain Japanese crank sensors common on Toyotas and Hondas. Based on lm393. | ||
== HEI 7/8 == | == HEI 7/8 == | ||
Latest revision as of 14:38, 23 April 2026
VR (Variable Reluctance) Conditioners take the semi-sinusoidal signal generated by VR sensors and outputs a (typically) 5v square wave that can be interpreted by modern ECUs. There are many variants, including hardware built into ECUs, add-in boards, and OEM standalone styles. These are not needed for Hall or Optical sensors as those generate square waves natively.
Discrete
"Discrete" conditioners generally use specific components to build-out a signal filter to generate the needed wave form.
uaEFI
mck1117 vr-interface
Built in "discrete" input. Based on the lm1815, open source
https://github.com/mck1117/vr-interface/tree/master
MAX9924/9926
Many VR Sensors are based on the ICs created by Analog Devices / Maxim Integrated. 24 is single channel, 26 is dual channel.
uaEFI
Built in 'VR2/Hall' input
"JDM" Conditioner
Typically contains special hardware to handle the "weird" signals of certain Japanese crank sensors common on Toyotas and Hondas. Based on lm393.
HEI 7/8
THE HEI 7 OR 8 IGNINTION MODULES WERE MADE BY GM IN THE 90S AND ARE GODS OWN VR CONDITIONER. ALSO KNOWN AS SILVERBACK BANNANA OR JUST USE THIS ONE.
HEI 7
Typical use is to use the 12v/ground, VR pins, and only the signal out to condition (Pin R) VR sensors, not the actual ignition modules. The HEI 7 uses spade terminals of ?? size.
Pinout
- B - Bypass Mode (used for dwell control, typically unused)
- R - Reference - 5v square wave, hall input on ECU
- E - Dwell control from ECU (typically unused)
- N - VR Sensor Negative -
- P - VR Sensor Positive +
- + - 12v, Battery (And coil positive if using)
- C - Coil negative (typically unused)
- Ground - The unit is grounded through the mounting screw
Part Numbers
Reference part number is lx315 and can be found via many sources.
General Motors 1976908
HEI 7
Basically the same as the HEI 8 module, except has full connectors and one extra pin for the ground so it is not needed to ground via the mounting screw.
Pinout
- B - Bypass Mode (used for dwell control, typically unused)
- R - Reference - 5v square wave, hall input on ECU
- E - Dwell control from ECU (typically unused)
- N - VR Sensor Negative -
- P - VR Sensor Positive +
- + - 12v, Battery (And coil positive if using)
- C - Coil negative (typically unused)
- Ground - The unit is grounded through the mounting screw
Connectors
1/8" Spades for VR Sensor
The 4-wire connector to MegaSquirt-II can be bought as:
- GM: 12126487
- AC Delco: PT757
- Motormite: 85135
- PICO: 5602
The two lead connector for the small cap module is the same as the recommended CLT sensor connector:
- GM: 15306195
- AC Delco: PT1350
- Wells: 254
- NAPA: ECHTSC200
- Motormite: 85100 (Autozone (PN 047131))
Speeduino Socket
Many modules follow the 'Speeduino' style of pin layout which is a DIP-8 socket format.
