Overview:
Car is a 1979 Volvo 242 with a 1995 Volvo 850 Turbo engine (B5234T).
Some details on the car:
- Inline 5-cyl., 2.3l, turbocharged (TD04H-15G), 4 valves per cylinder. The engine is essentially stock, save for a new (OE Volvo) intake manifold and 350cc injectors. At 15psi on the current setup I flow fuel for approximately 250bhp.
- VEMS 3.3 will replace the current setup of: MSnS-E 029y4 on a V3 PCB with sequential COP, batch fire injection, boost control, fan control, tacho output, two-step, and a Just Another Wideband (JAW).
VEMS Setup:
Apart from the standard sensors (MAP, CLT, IAT, TPS), I'm planning on setting up the VEMS with the following major functions:
- Sequential coil on plug
- Sequential injection
- Single channel wideband and EGT
- Dual channel knocksense
- Fan control, boost control, two-step, tacho output, shift-light, 20x4 LCD
Trigger settings:
The engine comes from the factory with a 60-2 wheel/VR sensor on the crank and a single tooth wheel/hall sensor on the cam.
Goals:
My initial goal with this install is to overcome the limitations of Megasquirt (some of which I have reached, others not), putting me in a much better position to take the car to the next level. Also to have a good time with it, and possibly learn something useful along the way.
Shopping cart:
I have put together a list of items to be ordered from the VEMS Webshop. Ideas, comments, or suggestions are welcome.
- GenBoard v3.3
- Injector or WBO2 heater driver (6)
- Ignition driver (2, running ignition in 2+6 configuration, see Spark page)
- Power Flyback - With wire
- Dual channel knock sensor interface (do I need this, or is it included on the board already?)
- 250-400 kPa MAP sensor - MAP connection 400kPa bare - Supply 5V (webshop is somewhat unclear, is this the correct map sensor?)
- Alubos1600
- Alubos gasket
- Alubos Endplate
- Alubos EC frontplate
- Econoseal18-PCB
- Econoseal36-PCB
- Econoseal18-harness
- Econoseal36-harness
- Wideband connector - With crimped wires
I have decided to purchase the un-assembled GenBoard for a few reasons: I'm doing this as much for the learning experience as for the VEMS feature-set. If I wanted a 'plug-and-play' system I would buy a Haltech or Motec. A much more minor motivator is the lower price.
I will be purchasing power resistors and an LCD seperately, as I can find both for much lower price locally.
Sections: (most of these are incomplete, will continue to add info and break into sections as time permits)
x Crank and cam sensors/settings
The crank setup is a 60-2 trigger wheel built in to the flywheel using a VR sensor. Cam setup is single tooth wheel using a Hall sensor.
x Sensors and inputs
Fuel (Injectors, VE, lambda, enrichments) MembersPage/KarlBuchka/Fuel
x Spark (Coils, Spark advance)
Coils are OE Volvo from an S80 T6. They have built-in power stages and are suspected to be internally identical to the Bosch Motorsport Single Fire PT coils, data-sheet here: http://www.vems.hu/files/MembersPage/KarlBuchka/Single_PT.zip
Coil pin-out:
1 - Trigger
2 - Not Used
3 - Ground
4 - +12v
The coils pull up to +5v to fire.
Connectors/pigtails sourced directly from Volvo:
The plastic connector itself is part number: 9456341
The +12v feed pigtail is part number: 30656689 (will need 5 of these)
The ground and signal pigtails are part number: 30656688 (will need 10 of these)
x Outputs/ancillaries
Fan control, boost control, shift light,