ribs

I just put together my mega squirt fuel computer and it f'n worked! I really jazzed. This is for an '86 MR2 that is getting a turbo and a lot of other goodies. The MR2 is also getting a mega jolt lite jr to control spark, but I am still waiting for the PCB to arrive. If I like the way this works on the MR2, I may have to put together another mega squirt and mega jolt lite Jr. for the 951. BTW, I believe all of the parts for everything (MS, stimulator, relay board, MJLJ) cost me about $250, with another $30 for a ford EDIS system from a junk yard that the mega jolt uses, so this is a cheap alternative to chips, MAF kits, MAP kits, other stand alone computers, etc., but just a little more work to put together. Here are some pictures...











I just got it done about 20 minutes ago! I was soldering with only about 1.5 hours of break time from 4:00 pm until 3:00 am. Before I did the final test I realized I skipped a couple of steps and noticed I soldered a diode in the wrong spot, and I forgot to solder in 3 capacitors, so after going over the diagram of the board a couple of times and looking at my creation, I was able to iron everything out. I ran the MS with the stimulator on my PC and everything works like it should!!!

After I got the MS to work, I went ahead and soldered together the relay board as it only took about 30 minutes to do.

If you notice on the picture of the stimulator, there is a big huge ugly potenometer that doesn't exactly fit the board. For some reason, digikey didn't send (or charge for) the 1 mega-ohm pot, so I had to get what I could at radio shack.

I still have a pile of parts waiting for my MegaJoltLiteJr PCB to arrive...from what it looks like, it should only take about 2 hours to put together.

From what I remember, the stimulator took about 1.5 hrs to assemble, the relay board took about 30 min. to assemble, so do the math and that's how long it takes for someone with little soldering experience to put together the megasquirt.

I still need a case for the megasquirt & relay board, still need to screw down the MAP sensor, voltage regulators, still need to solder in LED's and attach everything to the case, but it is 95% done.

Now all I need for project MR2, besides the MJLJ board, is a turbo, exh. manifold, exh. piping, big injectors, fuel press. reg., and intercooler piping to complete my project. I will be working on getting this stuff soon. Thanks for reading.

theedge

I was wondering if those things worked for our cars... Now I know for future

Mark-87-951

I'm looking forward to seeing more of your project and best yet how it goes for you on a 951 :-D

johne

Rich,
How do you plan on handling flywheel position sensing? Are you going to install magnets in the flywheels and read from them? Or does the MR2 have an existing Flywheel Position Sensing system that you are going to use, if so what system did Toyota use and how are you getting it to work?

Thanks,
John

Perry 951

Hey... looks like mine!! You'll have fun setting it up. So far, in testing only, ours shows a lot of promise. We're only using the squirt since we have a dual plug setup from Electromotive.

Check out the message forums on Yahoo. There are a ton of firmware and controller updates listed on there.

ribs

It will drive just about anything. They are extremely flexible and can use all of the stock sensors, so you don't run into the problems with a tec2/3 where you have to replace everything with bowtie sensors. When I was assembling it, there is one resistor that you have the choice of changing with different values (2.47K ohms for bowtie temp sensors, replaced with 2.2K ohms for nippon-diso/bosch), or you can alter a calibration file. For spark (which the megasquirt doesn't do, but the megajoltlitejr does) I'll discuss in a second.

It will probably be a month and a half or two before I get the engine in the MR2 (I'm still hunting for parts...mostly from junkyards, turbo exh. manifold is a simple modifcation of a b-series honda turbo manifold with a 4AG flange welded to it), but as my progress continues, I will post it in here, and you can see how difficult or easy it is to tune for one of these. The 951 with a megasquirt and MJLJ (or maybe ultra mega squirt if they release it by then...one box does spark and fuel, but its still under development) will come after I get the MR2 all together running low 12 second 1/4 miles (which many do with my proposed set up).

The MR2 uses a cam position sensor to drive spark, but I can't use that to run the megajolt lite Jr. What I have is the EDIS system out of a '91 escort ($30 out of a junk yard)...it is basically two coil packs, a control module, a 36 minus 1 toothed wheel, and a magnetic sensor. The MJLJ is just a controller for the EDIS control module, allowing however much advance or retard you desire based on manifold pressure and RPM.

To make this work on the MR2, I need to weld the EDIS 36-1 wheel to the front of my crank pulley and fabricate a mount for the sensor (most people go on the alternator bracket). Luckily, the guy who finished development of the MJLJ project (bowling and grippo, the megasquirt guys, started it, but never completed it) made it for a turbo 1st gen MR2, so there is a lot of information related to this particular application.

I believe the megasquirt just injects off of ignition pulses, so as long as you have a functional ignition system, you need not worry about flywheel position for fuel.

Perry, are you putting this on the 951 or something else? I've looked over the Yahoo board and I have the latest configurator software and all that jazz...apparently Al Grippo (the guy who sells the PCB and preburned processor) put the latest firmware on the chip before he sent it out. I know that with one firmware upgrade, you can use the fast idle output to drive a ford EDIS system (like the megajolt lite Jr) but it isn't as flexible. Tell more about your project...

Sam Lin

Congrats on completing it! I've got one on the way (parts) just to play with - The whole Mega_____ "thing" is an amazing project and a lot of fun to be part of!

Sam

Perry 951

My pops and I have been working on a secret 911 project for about 9 years. To put it simply, it is an '82 3.0 motor with twin plug big bore/big valve assembly, light crank, rods, pistons, etc. We've slowly evolved this motor over time.

It's a hair under 3.4L and now carries the late style intake manifolds with EFI (rather than the turbo CIS setup we had) so we can use the Megasquirt. We are in the process of finishing some CNC end plates that will adapt our new 2300AR Whipple Charger to a sizeable intercooler. We'll use an Electromotive twin plug spark control system to do the magic with timing and to also trigger the Megasquirt.

Sounds fun huh? After 8 years we finally ditched all the OEM bits and pieces we aquired and piggybacked together to make it work. Should be fun, but we have a long way to go yet.


We should see 500hp+ at 12psi.

1FastRedSC

This doesn't have much to do with your car or anything, but thought i'd throw it in anyway. This kit ended up yielding an extra 23 hp which is said to be sort of modest. And like you said, it's much simpler that most think.
http://forums.pelicanparts.com/showt...hreadid=139422

ribs

Perry...very impressive. I remember you talking about that car a while ago...let us know how the tuning goes.

I spent about 3 hours trying to solder "the cable" for the megasquirt, and every time I moved it, one of the leads would pop out. I finally gave up and figured out a combination of premade cables that would get the job done...it was an RS449 extension cable, male to female db37, straight through, and a female to female genger changer. It cost me $30, but will alieviate the headaches of trying to make this cable (its funny that a 16 wire cable is more challenging to make than a fuel management computer).

Campeck

dangit!!
hopefully electronic class next semester will patch up pmy electronics knowledge.....I wish I knew what the hell yall were saying.