Versatile Engine Management Systems / / ACMV, LLC
  Top » Catalog » Engine Management » Upgrade Parts » autofly4.0 My Account  |  Cart Contents  |  Checkout   
Engine Management-> (157)
  Adapter cables (12)
  Fuel delivery (6)
  iButton security (2)
  Ignition (5)
  Pneumatic parts (7)
  Sensors (27)
  Universal Harness (3)
  Connectors (16)
  Accessories (7)
  Wiring Accessories (13)
  Upgrade Parts-> (13)
    Output drivers (9)
  Spare Parts-> (35)
What's New? more

Brass Nipple 1/8NPT
Quick Find
Use keywords to find the product you are looking for.
Advanced Search
Shipping & Returns
Privacy Notice
Ether Cryptocurrency
Bitcoin Cryptocurrency
Conditions of Use
Contact Us
LowZ extension 4 channel

Automatic flyback board for LowZ (low impedance injectors). Only useful in a setup with low-Z injectors (installed now or possibly later): allows PWM-ing which makes series power resistors unnecessary and makes injector close faster (=better control, easier to tune idle, better toleration of injector-opening variances between all cylinders).
The 4 channels are: inj-A,B,C,D (1,2,3,4): EC36/7, EC36/19, EC36/8, EC36/20 respectively. If number of injectors > 4 then the 8-channel version must be used.
Genboard v3.x supports injector PWM-ing:

After about 1msec of full (14V) drive, PWM-ing (35..50% duty is most common) is the coolest method for driving low-impedance injectors (results in less heat in injector drivers).
This automatic flyback board provides the required low voltage flyback while PWM-ing is active, and high voltage flyback to make injectors turn off faster after PWM-ing is over (for the best of both worlds). Effectively, instead of low-voltage flyback all the time this results in faster injector switchoff and therefore more predictable fuel-delivery between cycles and between different injectors (different injectors have slightly different closing characteristics, even from the very same manufacturing batch - even if measured+grouped, injector closing characteristics changes a bit during operation).
Installation: Please look at the picture (click for bigger).
The low-Z extension "daughterboard" is normally mounted on top of v3 to injector FET mid-pin outputs (for much easier mounting, extra pads are available on the mainboard since v3.8).
On top of these 4 or 8 connections (depending on 4/8channel) to be made between daughterboard and mainboard, there is only one extra pad to wire: in the middle of the low-Z extension board, the "flyrail pad" which is connected to the (non-stripe-marked leg) anode of the big 1k5E / 30V unidir transient-protection diode: wire this "flyrail pad" to the injector common +12V (which goes to all injectors), normally via EC36/23.
Note that you might want to remove the big 1k5E / 30V unidir transient-protection diode from the mainboard before installing the daughterboard: the low-Z has similar big 1k5E / 30V unidir transient-protection diode, when properly installed, the (non-stripe-marked leg) anode "sinking current" to the EC36/23 that one can (should) verify. (The transient diode on the mainboard could stay, only justification to remove is for mechanical reasons for easier/closer mounting of the daughterboard).
With highZ injectors or low-Z injectors with series resistors, PWM-ing should be configured off (100%, 25.5msec) than low-Z extension kit does not give advantage (but does not hurt either). If PWM-ing is not required, the default 30V "high voltage flyback" is a cheaper solution with same effect (but than PWM-ing must be disabled to avoid damage).

This product was added to our catalog on Saturday 09 April, 2011.
Customers who bought this product also purchased


nRF24L01 wireless transceiver SPI
EAW-52 RoundV2 WBO2 & EGT Controller
EAW-52 RoundV2 WBO2 & EGT Controller
250-400 kPa MAP sensor
250-400 kPa MAP sensor
Econoseal / JPT Crimptool
Econoseal / JPT Crimptool
VEMS motronic88
VEMS motronic88
Shopping Cart more
0 items
Notifications more
NotificationsNotify me of updates to LowZ extension 4 channel
Tell A Friend
Tell someone you know about this product.
Reviews more
Write ReviewWrite a review on this product!
English Deutsch

Copyright © 2018 VEMS Shop
Powered by osCommerce