Magasquirt

[Bertstoy]

I am wondering if any fellow Pelicans have heard of the Magasquirt EFI system. Long story short I bought my 1980 911sc in pieces and it was not running. Through investigation I am told that it has to do with this Magasquirt.
I found some info on the net but it was very technical and did not give me any trouble shooting tips.
My questions are should I keep the system or go back carbs and if I should keep it does anyone know where I can talk with someone who might be able to help in layman terms....

[Joe Bob]

First off it's MEGASQUIRT....with an "E". I run it on a custom 4 cylinder with a Turbo. It's pretty straight forward but likes a warm engine and Wide Open Throttle the best.

What fuel injection does it have? Does it have stock CIS fuel injection and stock motor?

[doug_porsche]

Running on my 3.0

Check out www.Bitzracing.com. You will find doc, parts, etc.

[Bertstoy]

Thanks for the responses. From my spelling it is somewhat obvious I do not know anything about this system. What I do know is I have 6 Webber throttle bodies and the system is supposed to be a MEGASQUIRT.
At this point I have never heard the car run and I can not get spark or smell any fuel. From what I was told and have read on the net the system is also hooked into my ignition somehow.
I am looking for simple setting, test or bypass to try and get this thing to fire

[Joe Bob]

Best to post pics, get an engine number and other information.....engine number is down by the Pulley on the right side....it will say something like 930/XX. Serial is there as well....the engine number is fainter.

[john walker's workshop]

yank, throw, and buy a complete intake system off the 911 parts forum, or go webers.

[sjf911]

Installing Megasquirt is a major chore but can be very rewarding. It depends on how adventurous you feel and how much time and effort you are willing to put into it. Carbs are the easy way out .

First Dyno Run

Post some pictures of the install. You should have an extra cable or wire adapter hooked up to your coil for the ignition output and a vacuum line off of the intake somewhere. Was this a "tbitz" kit install with the CIS intake or an alternative?

[Bertstoy]

I have been known for the easy way out. I am going to persue the EFI while the car is in the final assembly. I will try and get some more info and pics but I might not be able to do that for a couple of days..
In the meantime does anyone suggest 6 webbers?....

[mb911]

contact tony at bitz racing he can help.. I run it on my turbo motor

[rcecale]

Originally Posted by john walker's workshop

yank, throw, and buy a complete intake system off the 911 parts forum, or go webers.

Originally Posted by Bertstoy

In the meantime does anyone suggest 6 webbers?....

If JW recommends Webers, go with Webers!

Randy

[911Mac]

The fact that you car's not running is a bad sign. If it was something simple the PO would have gotten it running and been a ble to sell it for a lot more. Unless you can take the time to learn all about megasquirt controller and how it works you'll never be able to diagnose and fix even simple problems.
Doesn't sound like you have the tbitz kit mainly because you have ITBs. If your version of megasquirt has ignition control then you're going to have to deal with restoring the ignition too. Does the car have a distributer? Pictures of the engine would help a lot. You may get a decent price selling the ITBs, the megasquirt controller on eBay. Could help offset the price of the carbs and ignition pieces parts.
The megasquirt controller is probably under the passenger seat. It'll have a vacuum hose connected to it and a cable bundle with a wide connector. There's a 9 pin connector that is used with a serial cable to connect it to a pc and allow it to be programmed using the megasquirt software. In the engine compartment there may be a daughter board connected to the bundle of cables going to the controller. There may not be a daughterboard at all.
If you can find someone near you that is experienced with megasquirt maybe they'd take a look at it and give you an idea of what you've got to deal with.
Lacking that, I'm with Johnny Walker - Yank it and install some carbs and standard ignition (if needed).

Good Luck,

Mac

[jpnovak]

Megasquirt is a DIY system. Depending on how much time you want to devote to getting it running its fairly simpleExpect to learn about how fuel management systems work so that you can troubleshoot problems. there is a ton of information out there on this system.

start at www.megamanual.com.


here is a thread to my MS install. Does your engine look like this?

EFI Kicks A$$ - the ST goes electric

I replaced webers with the EFI. It runs a lot better throughout the rpm range. Cold starts and off-idle response still need work but I have not spent much time tuning there.

The first thing I would do is read up on MS and then find a wiring diagram. Trace the electronics for the system. Find out what sensors you have. Find out how the injectors are wired. Find out how the vacuum system is plumbed. Find out about the oxygen sensor. YOu must have a wide-band sensor to make it work properly.

Next I would pull the ECU and buy the stimulator (~$75). This will allow you to sit in the comfort of your home and test to make sure all the functions work. At the same time you will familiarize yourself with the software and its functions.

YOu can then download the MS files and start programming the ECU. you will need a serial connection or a USB-Serial conversion dongle. An old laptop works great (W98). I can send you my files that will get your car running. Once its running you can start tuning on your own. Each engine has minor differences that you will adjust for. Mostly the tuning part is driving the car, datalogging the ECU, feeding the datalog through an analysis program and then reflashing the ECU. ONce you get the hang of it its pretty simple.

[Bertstoy]

Thanks 911Mac. You were right, the control box is under the passenger seat. I will get some pictures and more information now that I can finally ID the Megasquirt.
I checked out JW's website... I do like the Weber idea.

[ischmitz]

mikez wrote:

It's pretty straight forward

I won't say anything !!!
I won't say anything !!!
I won't say anything !!!
I won't say.......

of course you can always ask a friendly neighbor if you get stuck

Seriously,

If you know how to program computers, have some basic understanding of how a MC9S12C64 microcontroller works, know about fuel injection theory, ideal gas law, have good mechanic skills, electronic troubleshooting skills, soldering skills, like to tinker with things, have access to tools, and above all are willing to learn and study a lot along the way Megasquirt is for you. Else follow JW's advice and get something a little less complicated. John does give some good input here every once in a while

Read here for an introduction: http://www.megasquirt.info/

[Bertstoy]

OK... With the help of this forum I managed to locate and get more info on my system. It is a v2.2 with the MSI chip (8x8 fuel map) as well as the MSII daughterboard (12x12 map)).
I have included a couple of pics of my engine to answer some of 911MAC's questions.
I would like to try my best before I take the carb route

[Joe Bob]

Originally Posted by ischmitz

mikez wrote:

I won't say anything !!!
I won't say anything !!!
I won't say anything !!!
I won't say.......

of course you can always ask a friendly neighbor if you get stuck

Seriously,

If you know how to program computers, have some basic understanding of how a MC9S12C64 microcontroller works, know about fuel injection theory, ideal gas law, have good mechanic skills, electronic troubleshooting skills, soldering skills, like to tinker with things, have access to tools, and above all are willing to learn and study a lot along the way Megasquirt is for you. Else follow JW's advice and get something a little less complicated. John does give some good input here every once in a while

Read here for an introduction: http://www.megasquirt.info/

MY OLD eyes are not good for doing close up work.....so I let you do the soldering and assembly....then YOU volunteered to do the rest.

I only do grunt work now......why should I when I have my own pet German around????

Back on topic. Looks like the previous owner spent a few bucks on THAT set up.

[Bertstoy]

This is my first Porsche... I got it in pieces in an estate sale and I am not really sure what i have. I just got it back from the body shop and I finally get to see the car with doors. I have yet to hear it run. I do know it was running when the rest of the car was dismantled.

[Joe Bob]

Well, either you bone up on the Megasquirt or pull that stuff off and either go with carbs or original FI. If you have smog rules in your area, you'll likkely need to go back to stock. You might get lucky and have a minimal outlay of cash for the swap by selling what you have.....

Did you look for the engine #?

[jpnovak]

OK, let's ID some things from the pictures. It looks like you have a very nice setup. At this point you should consider getting the megasquirt up and running.

I see 40mm TWM individual throttle bodies. It looks like there is a single vacuum line coming from the driver's side bank. This will not be enough to get a good vacuum signal for MAP tuning. Are there any wires going to the backside of the passenger ITB? this will be the throttle position sensor (TPS).

You will need to look at the exhaust to find an oxygen sensor. I also see an extra wire by the pass side heat duct. I assume that the MS system is tied to the factory oil temp sensor/switch.

When you turn the key on you should see the three LEDs on the ECU under the seat blink. does this happen? Your fuel pump should also fun for 2-3Sec and then fuel pressure will register on your gauge. Does this happen?

Let's assume the MS is wired correctly. you need to check a few things. First, unbolt one fuel rail. there will be two M6 allen head screws holding the rail to the ITB. remove one injector. Look for the number onthe side. This will tell you what the flow rate is. I can email you a file that will get the car running but I will need to scale the system by the size of your injectors.

Do you have a laptop capable of running a serial connection? If so, you will need to load some software to connect to the controller. The software is available free on the internet as opensource. You will need the initialization files for MS, MegaTune2.25 and MegalogViewer. I can send you links.

Once you can connect to the ECU I can walk you through the process of getting it running.

[mb911]

whoa jack pot... very desirable set up there.. let jamie help you will not be disapointed