4agze twincharged ae86 project update...<br><br> <br>

Good news with this update...It runs!<br><br>
<img src="start1.jpg"><br><br>

As usual, there are issues to solve, I'm dumping power steering fluid like mad, I have 2 oil leaks on the oil pan, and it dosen't sound like it is running on all cylinders.  I think that is more of a programming or wiring issue.<br><br>

The ACT clutch feels MUCH firmer than the centerforce pressure plate.<br><br>
<img src="start2.jpg"><br><br>
Imagine that.. Wiring that looks like that, with 15 little jumper wires everywhere, and I have a wiring problem? go figure!
For the ignition, I am NOT running EDIS like I originally planned.  I want to have a rev limiter and I don't want a trigger wheel welded to my front pulley.<br>
I originally started with a 72-2 tooth wheel mounted to a cam sprocket, and an inductive pickup on it, but the faster the wheel spins, the smaller the amplitude of the pulses are.  I don't think the edis box will pick them up at high speed, so I am abandoning that idea.  Next, I went with an optical pickup, using the same 72-2 tooth wheel on the cam sprocket. <br> Same type of problem there... The light beam of the optical pickup is too fat to work well with such a fine tooth wheel, the signal doesn't have a wide voltage swing, just a ripple on a dc level.<br>  The solution is a new trigger wheel with a lower tooth count.  I am now successfully using a 16-2 tooth wheel on the cam with the 'generic wheel' option in megasquirt.  The optical sensor likes the much bigger teeth on this wheel.  Megasquirt thinks that the wheel is an 8-1 crank-mounted wheel, and that is fine for 2 ignition events per crank revolution.<br>  I am using two Toyota 4ac igniters to trigger the EDIS-4 coil in a wasted-spark configuration. <br> <br>***Megasquirt tips***  When trying to see if megasquirt is counting your trigger wheel pulses, turn the 'stim for wheel' setting ON. Then you will get a spark output for every tooth that passes your sensor.  (disable the fuel system before trying this).<br>
Also, if you are using transistors to drive the spark output signals, then turn 'invert output' to ON so that the igniters do not overheat.<br><br>
I mounted the 2 igniters to an aluminum plate, and will eventually have 4 igniters on the plate and 4 separate coils for the spark plugs.  I like the EDIS coils, they give a nice hot spark, so I will probably use 2 EDIS-4 coil pairs to run all 4 plugs.<br><br>
I intended to polish the intake plenum, but the shop that welded it for me used a wire wheel on it and gave it a nice finish.  I think I will leave it like that for now.  It kind of matches the valve cover and header cover.
<br><br><img src="start3.jpg"><br>

<a href="index.html">Home</a>
<br>
<a href="20-valve.html">20 valve page 1 diagrams and theory</a><br>
<a href="20-valve2.html">20 valve page 2 - pictures </a><br>
   
<!-- following code added by server. PLEASE REMOVE -->
<!-- preceding code added by server. PLEASE REMOVE -->