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My project is to turbocharge a BMW M20 engine. * cyl count=6 * main trigger= 60-2 on crank It will be charged with a T3/T4 turbo 0.57 trim. More specs I don't know right know. I'll have to check it again. The intercooler will be as big as possible. I made oil cooling on the pistons. http://www.e30tech.com/forum/viewtopic.php?t=5223 At first I want to know more about VEMS before buying it so I have all the things I need and don't get a delay later on for not haveing everything. I'm located in the Netherlands so if there are more people here I can talk to in dutch I would certainly appreciate it. Let me know!! I guess we have a lot in common: http://www.vems.hu/wiki/index.php?page=MembersPage%2FGergelyLezsak ---- 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. ::Q: Why not run the MAP sensor that comes with the Genboard? The internal mounting is perfect and secure. :A: I prob can have the bosch MAP/IAT sensor for free, and I'm not a big fan of running vacuum lines though the firewall. :Q: But if it's easyer which MAP should I choose? ::Q: Do you need a stock IAT sensor? You can buy a 1 Euro NTC resistor, has worked great on many cars as intake air temperature sensors (faster than stock Bosch). More info here: GenBoard/Manual/IntakeAirTemperature :A: interresting thanks for the link! Q: What do I need more? ::A: You can distribute spark through the stock distributor, which on your engine is mounted in front, on the head of the engine. You will eventually need an ignition amplifier with lots of boost if running this setup, single coil and distributor. ::VEMS Genboard can control separate coils for each cylinder, if you provide the correct trigger for it. 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!). :A: I will prob use this setup. Maybe evolve to a truely sequential ignition in time. Q: How is a laptop connected? ::A: This question is answered in the manual, please read it fully: [http://vems.sourceforge.net/manualhtml2/ GenBoard Version User's Manual] :: 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. Q: Can I load two maps and switch between the two while driving without a laptop? One daily map and one track map?? ::A: No you can't with the current firmware. Why would you want two different maps? The only reason is if you use two different fuels and need different VE maps and ignition advance. Of course with boost control you could have a lower setting if you choose to experiment with the boost controller code. At the moment that is easier with just physically manipulating the wastegate spring pre-load. :A: I will be using two types of fuel. http://www.prins-lpg.com/en/products/vsi/index.html : I don't know if you have the time to look into the system but I'll try to explain it in short. It works with a master slave principe. The LPG computer takes the signal to the fuel injectors and alters it to drive the LPG injectors. The main problem is, the biggest injectors only support 50 hp per cilinder. So my goal is to run higher boost levels on petrol at the track and lower boost levels daily on LPG till I can figure something out to raise boost with LPG. It would be great if I would be able to run on LPG all the time. ---- I have the same 60-2 wheel http://www.vems.hu/wiki/index.php?page=MembersPage%2FGergelyLezsak%2FTrigger For myself: http://www.vems.hu/wiki/index.php?page=GenBoard ---- read: original MegaSquirt documentation besides VEMS manual, since MegaSquirt is basically the same. ---- '''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 add a variable map where injector times are dependant off. I don't know if I just can add a variable or I can reconfigure a built in variable like Vbatt. Future problems: * The biggest injectors support only 50 hp per cilinder. This can be raised by raising the pressure. Problem with raising the pressure is the injectors only open till about 3.5 bar. By a fuel cut-off pressure will raise very fast and will exceed 3.5 bar very fast. Solution will be something like a pressure release valve. * Second problem with raising the pressure is the vapouriser will not be able to vapourise everything so liquid LPG will be injected. This way I will not be able to control the amount of fuel injected precisely. * Develop a second base map and a possibility to switch between maps while driving. 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. ---- I guess it's not impossible to develop the firmware to use two (or more) base maps. However running on LPG even on race-time shouldn't be an issue, if you use multiple valves, or hack the pressure reductor to give more pressure, until the valve holds it. (Then upgrade to a nitrous valve :) - Problem of LPG on the track is you can't refill on the track so you have to go to a off track pump to refill. * Or possibly you can bring there commmon household Propane-Butane cans to refill. It's very common here (in Hungary) to run LPG cars on household PB cans, since it's much cheaper. The only difference is the smell (to help police :) It's true I can boost it a bit up and inject the LPG with more pressure. This way I should be able to run higher hp levels. * I even thought of eliminating the reductor at all. This way you may can utilize the icing effect of the pressure drop as a charge cooler :) Can you tell me more about such a nitrous valve? * http://www.diy-nitrous.fsnet.co.uk/index.htm ---- '''Low impedance injectors''' VEMS GenBoard/VerThree (v3.x, like v3.3) has 8 output channels that are capable to drive low impendence injectors. I'd love to run the LPG injectors directly and not with a supplementary controller, cause I have total control over VEMS while I only have indirect control of the proprietary controller. Problem is my 440cc fuel injectors are high impendance and the LPG injectors are low. I guess I could only run the LPG injectors at first and later on develop a system to run both fuels with VEMS. :Q: there is a difference in the signal to a high impedance injector and the signal to a low impedance injector. How is this configured in VEMS. (Peak and hold for low impedance.)
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