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My project is to turbocharge a BMW E30 325i M20 engine. Engine specs: * cyl count=6 * main trigger= 60-2 on crank http://www.vems.hu/wiki/index.php?page=MembersPage%2FGergelyLezsak%2FTrigger * stock internals * T3/T4 turbo 50 A/R Compressor, 0.63 A/R Turbine .57 Trim 3" inlet stage 3 wheel * Oil cooling on pistons http://www.e30tech.com/forum/viewtopic.php?t=5223 * Intercooler will be as big as possible * Lime green 440 cc bosch high imp petrol injectors I guess we have a lot in common: http://www.vems.hu/wiki/index.php?page=MembersPage%2FGergelyLezsak ---- read: original MegaSquirt documentation besides VEMS manual, since MegaSquirt is basically the same. [http://vems.sourceforge.net/manualhtml2/ GenBoard Version User's Manual] http://www.vems.hu/wiki/index.php?page=GenBoard ---- Q: Which parts do I need to get full control of injection and spark? Assembled v3.3 controller * ignition driver 8 * Knock and EGT knock and 2 EGT * LCD and PS2 yes * MAP connection offboard(electronic) * primary_trigger VR * secondary_trigger HALL I want to use a bosch map/temp sensor I'll get the number later on. Pro's con's mapsensor * mounting * line though firewall * speed IAT sensor: GenBoard/Manual/IntakeAirTemperature * faster then stock bosch ---- '''Spark control''' With your stock 60-2 wheel you can control a wasted spark coilpack directly with VEMS without any additional triggers. You can borrow a coilpack for a 6 cylinder car from an EDIS6 equipped car, like a Ford V6 (You don't need the EDIS module itself, just the coilpack!). Laptop connection: Basically you use the serial port on the computer, and the corresponding port on the Genboard is either through the smaller EC18 connector or from a pin header inside on the board, which is usually routed to an end-plate in the form of a regular DB9 (standard serial RS323) connector. ---- '''LPG section''' I wil be running LPG with a Vaporised Sequential Injection System. http://www.prins-lpg.com/en/products/vsi/index.html Stage one plans: * Use Prins vapouriser, injectors and use VEMS to control the amount of fuel. Problems: * LPG doesn't have a steady fuel pressure in the fuel rail. So I will have to make req_fuel scaled according to the 1/sqrt(lpg_pressure). There is no need for an extra variable, since req_fuel is already there! All that is needed is 1 bit to enable the lpg_pressure dependent scaling (maybe 3 bits so the mcp3208 channel can be chosen: well, 1 byte might be more future-proof). You can add a variable at the end of config. Actually, the same would be suitable for gasoline as well, if one trusts his fuel-pressure sensor. *Pressure in the fuel rail isn't constant because off the liquid to gas transformation and the volume flow trough the vapouriser. By a fuel cut off, liquid gas is still in the vapouriser and increases in volume building more pressure. These effects are much to big to compensate with a pressure tank and are much bigger then the pressure fluctuations in a petrol injectorrail. A solution for this might be adding a pressure regulator with a blow off valve in the injectorrail. Or atleast a pressure relief valve set at about 4 bar. Problem with a higher pressure then 4 bar the injector won't open anymore. Future problems: * Injectors are to small. * Vapouriser might be to small. (Might have to use two of them.) - I don't know customers prices, not my department :) You can send them an e-mail if you want to know. Second stage: * Add an other base map to Vems. I want to be able to run on petrol too. Problems: * This option isn't available jet * Running both high and low impedance injectors. ---- '''links''' BMW on LPG: http://zymo.homemail.com.au/bmw2.htm More info on nitrous systems: http://www.diy-nitrous.fsnet.co.uk/index.htm ---- VEMS GenBoard/VerThree (v3.x, like v3.3) has 8 output channels that are capable to drive low impendence injectors.
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