fuel injection ignition

Post the website for the vems system, I've never seen it. You will also want to check out www.sdsefi.com and www.megasquirt.com. MegaSquirt is a DIY EFI controller, or you can buy it fully assembled. It can be done on a budget.

You can use computer controlled ignition. Those two sites should give an idea as to how. The crank trigger is usually a wheel that bolts to the balancer and has an optic sensor mounted on the timing cover. You can also keep your standard ignition system and just have the computer control fuel delivery.

When you use a multi coil system you only have half as many coils as cylinders. Two pistons are always near the top at the same time no matter what engine configuration (four or more cylinders). The coil fires both cylinders at the same time. The one that fires in the exhaust fires weak because a spark jumps best through "clean" air. It's called a "lost spark" system. All the OEMs use this method.

Wasted spark setups are not really what all the oems are using. Most oems are going to a full COP(coil over plug) setup with one coil per cylinder. This is by far the most powerful ignition system available. Genboard can handle up to 8 ignition coils, so if you have the money and want to set up an old engine with COP, you can do it. If want to save some bucks, wasted spark with COP can be handles by genboard as well and a few guys are doing this already. You can also use the Mallory distributor with trigger built and wire it directly to the genboard. I am using this and it works very well. All the genboard does is see the trigger and then delay the spark output to the coil to adjust the timing advance. It is very cool to be able to tune timing with a key stroke on the computer while the engine is running. Timing is controlled with tables just like fuel.

The most accurate way to control timing is by using a crank trigger. The distributor triggers will work, but they are not nearly as accurate due to chain flex and gear slack.

If you want to do the sequential injection you can do it with one trigger, but the injector phasing will not be possible. Phase specific injector firing is really only helpful for a little gain in fuel efficiency. With the cam(distributor) and crank sensors, you can get dead on timing and perfect injector phasing.

I will also add that the WBO2 on the genboard is just awesome. You can graph timing, fuel, RPM, MAP, IAT, and AFR all in one screan. I actually tuned my turbo engine in three test runs after getting the WBO2 up and running. I did all the tuning with a calculator on the kitchen table basing changes on datalogging.

The vems group is working on getting a manual together to help new people. The developers like the wiki engine, but I personally hate it. After the manual is substantially finished, we will likely put up a simple bulletin board for Q and A. It is almost needed just to tell people where to find things in the wiki. Once you get used to wiki, it is not so bad, but at first it really sucks to navigate. The group is aware of this and is working to a better sollution

Chris