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)

[agrump]

Yarin,

I am using a pertronix. I did not use the Ed capacitor, I just changed the resister. I know what you mean about changing something and then having to change it back. I was pleased that I did not have to change the R57 back once I started controlling timing.

I did get the cover. I got it a long time ago when I was running MSI/V2. Godd idea about attaching the cover. Be warned that if you do decide to mount it low it is tough to get the wires into the terminals especially if two or more need to be connected to the same one.

I am using the stock fast idle device. I stole one of the connections for the IAC to use for my MAP sensor which I have mounted in the relay box. SInce I started with MSI/V2 I built a resister box for the injectors and am still using it so no PWM. For warm up enrichment I am using the stock head sensor. I manipulated the table so that it reads about 100 degrees lower the the actual temperature. It works ok but still cuts off to soon. There is a limit to what you can do by changing the tables, I think I got it about as good as it is going to get with the stock sensor. I am thinking about mounting a sensor next the the stock thermostat and see if I can get better readings there. With MSII you don't have to mess around with loading thermal tables there is a menu item under tools in megatune that will handle it for you. I am currently using:

5280 ohms -40 degrees f
2000 ohms -6 f
200 ohms 130 f

Again it is not perfect. Interestingly MSII limits the lowest temp you can enter to -40, I was using -48 with MS1 for the first entry.

I found a tps that fit within the plastic cover of the stock throttle switch. I wired it into the stock connector, it looks factory. I will try to dig up where I got it, it was online somewhere. Attached is a screen print of my warmup settings. I used VEXME software to tune my tables with a LC1 WB. I am playing around with the PID algorithm currently, the simple WB algorithm seems to oscillate to much.

I am with Dave in not trusting the stock connector although I have not had a problem YET. The minisquirt has a much nicer one but I can’t imagine changing it now, what a pain that would be!