Megasquirt Project, .....IT RUNS ! Options

[Michelj13]

Hi,

Although I have been a member for a while (since I purchased my 914), I have not posted much. I still love my 914 and it's is interesting how this car drives like an absolute go-cart.

Anyway, my engine is a carbed 2270 that I built up with the help of many including Jake, and I am now embarking on a Megasquirt project. As many know, megasquirt is relatively inexpensive for a programmable FI system. I find, however, that there is too much information out there that it is nothing short of confusing. I want to share my progress so that at the end of the day, some may learn and may become less intimidated. Hopefully I will be successful....we'll see.

I have so many questions that I will post, along with some things that I have already learned. ANY and ALL comments appreciated.

I made a youtube video of my progress up to date. Enjoy!

http://www.youtube.com/watch?v=RoJfMZ9YgQc

Michel (IMG:style_emoticons/default/smile.gif)

[Michelj13]

The plan is to use a 2L modified intake manifold with Porsche 944 ( 55mm) throttle body and stock 36mm ID runners.

The VR tach wheel and sensor that I am using is from Mark at Original Customs. I installed it at the time of the rebuild because I knew that I wanted to go with FI eventually. This saves me from pulling the engine out which is not my favorite job.

Mark also suggested that I use the stock intake system as he had success with it, and it is way cheaper that using dual ITB. There is also no linkage which is a major PITA if you ask me.

I had some 34 lb/hr injectors reconditioned that I purchased on ebay (part # 0280150431). Mr. Injector did a fabulous job cleaning them up and modifying with hose, O rings etc. for stock setup. Total price of injectors was less than $200. Hope they workout.

For the CLT sensor, I cut open a GM coolant sensor, extracted the thermistor, added wires and inserted into ground lug with some epoxy. I got this idea from the STF site. I checked calibration in boiling water, freezer, etc. and it responded as it should, so the default MS TS setting can be used. I have not decided where on the engine ( head, valve cover, or case) I will install this sensor.

I am undecided about the placement of the IAT sensor. I see many have installed it in the intake manifold, but, I have noticed that most cars have it installed between the air cleaner and the TB?

I have not purchased my O2 sensor as of yet. I have experience with an AEM one with gauge that I used to help me calibrate the CIS in my 911 a few years back (it seemed to work fine) and, DYIautotune is pushing Innovate. Any opinions on this?

Lastly, I want to make sure of the the firing order is 1, 4, 3, 2 and the wasted spark should have 1+3 and 2+4 firing together?

Tom, proper grounding and and minimizing noise is a definite concern. Thanks for your advice.