My name is Karl Buchka. I am an Electrical Engineering student at The University of Massachusetts Amherst. The 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).
Apart from the standard sensors (MAP, CLT, IAT, TPS), the VEMS is so far set up with the following functions:
- Sequential coil on plug
- Sequential injection
- Single channel wideband
- 20x4 LCD
Forthcoming functions are:
- Dual channel knock
- More temperature logging (EGT, oil temp, pre-intercooler IAT)
- More pressure logging (exhaust backpressure, oil pressure, possibly intercooler pressure drop)
- Fan control
- Boost control
- Tacho out
- Shift light
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.
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.
I purchased 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 more minor motivator was the lower price.
Sections: (most of these are incomplete, will continue to add info and break into sections as time permits)
Assembly, testing, installation, and start up: MembersPage/KarlBuchka/Installation
Crank and cam sensors/settings MembersPage/KarlBuchka/Trigger
Sensors and inputs MembersPage/KarlBuchka/Sensors
Fuel (Injectors, VE, lambda, enrichments) MembersPage/KarlBuchka/Fuel
Spark (Coils, Spark advance) MembersPage/KarlBuchka/Spark
(Fan control, boost control, shift light)