Megasquirt Progress, Main Board complete Options

[yarin]

Tonight I have completed building the main board for my MS II V.3.0 system. Thanks to those that have helped out. Once i'm all finished I will definitely post a complete "How To MegaSquirt a 914" website with pics and step by step. So far i'm still at the desk level. I've got 2.0 injection parts on the way.

I'll be using the following:

stock injectors
GM air temp sensor
stock fuel pump
summit racing manifold referenced fuel pressure regulator
stock injectors (i think 2.0s are on the way)
stock plenum / runners
stock CHT
MS Relay Board
Innovative WB02
High Current ignition driver
Stock dizzy with pertronix (hall sensor)
Stock Bosch Blue Coil
PWM Low impedence injector driver (no resistors)
Stock Cold start Valve (plan so far)
Stock throttle body with some junkyard TPS

Here is a pic of my board, took me a few hours a night every night this week. I took my time, double checked everything. So far so good!

I don't expect to have the system in the car for at least another month. I'm converting from carbs so I want to install steel fuel lines and clean some stuff up.

I'll be sure to post progress in the forums. (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif)

[yarin]

QUOTE (DNHunt @ Feb 1 2006, 06:57 AM)

Also on the injectors and fuel pressure. I believe the stock 2.0l injectors are designed for 28-36 psi. On the low side atomization is poor and on the high side the pintle has problems closing. I'm kind of fuzzy on that. One thing to look at Borg Warner makes replacement injectors for some if the later Bosch L-jet and K-jet systems. The output is way less so they are easier to control. These are barbed fittings in some cases and they all use the improved l-jet electrical connectors. Also, they are cheap. One problem the hoses are not swedged to the barbed fitting well at all and may leak. It's best to redo them with good FI clamps. The resolution with the MSII chip is 100X more sensitive that the MSI chip so you will be able to tune pulsewidths very well. I plan on using my 2.0l injectors and I expect it to be very smooth indeed. I ran a fuel only program that had 10X resolution before (Hi-res code) and it was very smooth. Unfortunately MS extra doesn't have the room for this. The 100X resolution was a big consideration for me to upgrade. Dave

Dave,

If the 2.0 injectors that are on the way are good i'll keep em for now. My original plan was to build a intake plenum, maybe individual throttle bodies.. but that has been put on hold.

Thanks for the info on the Borg Warner injectors. I'll hold off till I can build an intake manifold with all the goodies and pickup better suited injectors.

If there are atomization problems with the 2.0L injectors at low fuel pressure and pintle closing problems at higher pressure why are you going to use them? What pressure should I run them at? I'm going to use Summit's modified adjustable manifold referenced fuel pressure regulator. link here I don't want to end up with low fuel pressure(manifold vacuum) causing atomization problems. Is there any type of feedback I can look for aside from volume flow bench testing?