MembersPage/JanSaenen (2006-03-16 04:43:08)

My project is to turbocharge a BMW E30 325i M20 engine.

Engine specs:

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.

[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

I want to use a bosch map/temp sensor I'll get the number later on. Pro's con's mapsensor

IAT sensor: GenBoard/Manual/IntakeAirTemperature


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:

Problems: -I didn't mean the effect of a pulsing rail by opening the injectors like in a petrol fuelrail. I ment the pressure isn't stable like in a petrol fuelrail because it works different with LPG. That's why the original Prins management works with a Map/temp sensor in the fuelrail. LPG is much more temperature sensitive then petrol. This is the difference between petrol and LPG. Thus I will need to add a variable. Is this possible with Vems or can I change an existing variable for my use?

Future problems:

- Actually that statement isn't true. I was talking about those injectors. They only make 50 hp per cilinder with the standard Prins management system. Maybe when you raise the pressure they will make more. I know this for sure because I'm actually send-out by school to the company who made that rail. I'm at Prins Autogassystems at this very moment :).

Second stage:

Problems:

Various questions/talk

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 :)
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 :)
Q: Can you tell me more about such a nitrous valve?

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.)