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The T238 Fire Control Unit is specially designed for both single and double valve HPA engines.
If the FCU is used with a T238 Trigger Board it will suit most HPA engines e.g. Polarstar, Jack, Wolverine, Redline, Raven and Inferno.
If the FCU is used with other branded Trigger Boards it will suit Polarstar and Jack single and double valve HPA engines.
Engine Type: This value is very important as it tells the control unit how many solenoids are used in the HPA system. CB Mode: Allows you to select the firing sequence, where: In double solenoid setup with Open Bolt, the order of operation of the system is this: Nozzle Dwell => Nozzle Delay => Poppet Dwell => Poppet Delay
In double solenoid setup with Closed bolt the order is this: Poppet Dwell => Poppet Delay => Nozzle Dwell => Nozzle Delay RAMP Mode: RAMP feature lets you fire slow on SEMI mode. When firing speed increases and reaches a preset threshold, the rifle will start firing on FULL AUTO mode while cadence remains the same: if it decreases, the rifle will return on SEMI mode. (When enabling RAMP Mode, full-auto switch will be disabled) Sniper Delay: When enabling Sniper Delay, full-auto switch will be disabled, and the engine will only work in semi-auto mode, after each shot, the FCU will let you wait a period of time, and the length is determined by the set value. Magazine capacity limit: This function, if enabled, will cause the control unit to stop working once it reaches the set number of strokes and to resume, wait 2 seconds.
This allows you to simulate mid / low cap magazines even if magazines with higher capacities are mounted underneath, moreover if you set the real capacity of the magazine you will avoid shooting on empty.
Auto-load: When a connection is detected of a gel ball magazine, the FCU will power the magazine for a period of time, and the length is determined by the set value.
Friction Timer and Friction Value: Although often unnecessary with a well set replica, it may sometimes be necessary to set a higher poppet dwell value to overcome static friction. Static friction is a physical phenomenon that causes the first gel to be fired after a period of inactivity and comes out with lower power.
If you notice that after a few minutes of inactivity the first gel finds it difficult to be fired, or comes out weaker, it could be the fault of the static friction.
Choose after how much seconds from last shoot (Friction Timer) your Friction Value will be summed to your Poppet Dwell (just the first shot).
Put both these values to 0 to deactivate this function.
SEMI and AUTO: On some parameters you can read the words SEMI or AUTO before, this has be done to have different parameters value depending on your Fire Selector Position. When your blaster is on Semi, FCU will use the Semi parameters otherwise, if in Auto position, will use the other.
Poppet Dwell: These are among the most important, and indicates how many tenths of a millisecond the solenoid will remain activated. We suggest to never set a value less than 30 to avoid missed shots or other problems.
Nozzle Dwell: Another fundamental value is Nozzle Dwell. Expressed in milliseconds, it indicates the time required to load the gel into the hop-up chamber. It is used only on 2-solenoid systems.
Its value depends very much on the magazines used. We suggest never to go below 8 to avoid the risk of jamming or other loading problems.
Poppet Delay: It is a wait value expressed in milliseconds, a low value is useful for having higher ROF or reactivity, but often at the expense of precision. It should never be set to 0 nor too low. If the blaster fails, increase this value. We suggest to never set a value less than 4.
Nozzle Delay: It is a wait value expressed in milliseconds, a low value is useful for having higher ROF or reactivity, but often at the expense of precision. It should never be set to 0 nor too low. If the blaster fails, increase this value. It is advisable not to drop below 4.
1 = Common positive +5V
2 = Trigger switch: closing this contact to +5v positive will fire the BB
3 = Full Auto Switch: closing this contact to +5v positive will activate the Auto Mode
4 = Poppet Power Supply: this contact and +5V common positive will power on the Poppet Solenoid
5 = Nozzle Power Supply: this contact and +5V common positive will power on the Nozzle Solenoid
6 = It’s a trigger driven negative Voltage
7 = It’s a direct battery positive Voltage
8 = It’s a trigger driven negative Voltage with auto-load function for gel ball blaster magazine
Connector allowed are JST ZH 5Pin and JST ZH 3Pin.
APP for Android: Download and install the APK file from the website: http://t238.net. After installation, enter the settings -> APP¬ification, find the "T238FCU", go to APP permissions -> location permission, and select "Allow all the time". This will allow the smart phone APP to find the Bluetooth devices.
Bluetooth: Bluetooth programming function will turn off in 30 seconds after power on. Connecting FCU with smart phone needs to be completed within 30 seconds after power on, otherwise, the FCU needs to be powered off and powered on again. Open the app, click "Search" button to find the Bluetooth device "T238FCU" and connect it.
Package Includes: FCU, Wiring, and T238 Patch. Disclaimer: Please use discretion when installing custom parts as fit and compatibility may vary. Modification may be required. Professional installation is recommended. Warranty will be deemed void if incorrect self installation.
T238 designs and manufactures unique, high-quality Airsoft parts and accessories.