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Old 12-26-2007, 06:07 PM   #1
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Default low vs high impedence injectors

Can MS run both without needing to wire in resistors? AKA what would i need to do to run low impedance injectors with MS
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Old 12-26-2007, 06:16 PM   #2
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I'm hoping all that is needed is the additional ground wires that aren't pinned out on the board. I had my new PNP made like that from DIY and an MS parallel made by cjernigan. I will let you know in a week hopefully. Got low impedance 440's waiting to be installed.
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Old 12-26-2007, 06:27 PM   #3
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v2.2 needs the Injector Flyback board installed if you're using Low-Z injectors, v3.x I believe has flyback built in..
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Old 12-26-2007, 08:30 PM   #4
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So with the V3.0 you can run eaither?
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Old 12-26-2007, 08:38 PM   #5
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From what I read, yep!
http://www.diyautotune.com/catalog/m...unit-p-56.html

Quote:
Features / Benefits of the MegaSquirt-I EFI System

* Onboard MAP sensor for NA or boosted engines up to 21psi!
* Speed density or Alpha-N.
* Use any injector - High or Low impedance.
* Compatible with output from narrowband and wideband O2 sensors.
* Log data on your laptop for later analysis.
* Tuning software is free for download and regularly updated with new features.
* Open Source design - all code and hardware information is available online.
* Includes proper female DB37 connector and shell for your wiring harness.
* Professionally Machined Brushed Aluminum Endplates. Excellent Fit and Finish!
* Aluminum Case with flanged ends for easy mounting.

New Features specific to the latest PCB Version 3.0

* All automotive temperature grade components for increased reliability.
* Higher quality 4 layer PCB for increased resistance to noise/crosstalk. All PCB's electrically tested at the factory for enhanced quality control.
* Added current limiting circuitry to provide increased fault tolerance--- it other words, it's much harder to blow this thing up if you make a mistake!
* Uprated Flyback circuitry is now built in- bring on the low-z injectors!
* Onboard Heatsink bar
* Large Prototype area onboard- for adding custom circuitry to your ECU
* Supports use of original MS tach input, ignition coil triggering, VR, Hall and Optical sensor triggering.
* Direct Ignition coil driver is now on-board
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Old 12-26-2007, 09:29 PM   #6
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sweet
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Old 12-26-2007, 09:30 PM   #7
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If you have the PWM circuit built in, then yes.
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Old 12-26-2007, 10:54 PM   #8
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be warned though, it may cause tach spikes. if that happens you'll have to figure out better grounds.
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