First, I need to thank everyone who maintains the Megasquirt megamanual and who has put time into additional write-ups. I have used the http://www.miataturbo.net/forum/showthread.php?t=13676
I am building a Megasquirt I V3 for our 1997 Miata. Prior to this, the car has absolutely no modifications to the engine. I am building this primarily as a learning experience, but if there is some performance to be gained, Iíll be glad to take it.
For this installation, I will be running the Megasquirt in parallel with the stock ECU. This is mainly to simplify emissions testing, but should also make it easier to retain the air conditioning. We are currently in Jacksonville, FL, Jacksonville and do not have emission testing. The car will eventually be back in Gwinnett, GA. When I last lived in there, they inspectors looked for a working OBD-II connector. I donít want to deal with a non-standard inspection. The parallel install will also make it easier to revert back to stock if I really mess up.
I purchased everything in the ďwhat to buyĒ list except the boost control mod kit. I also purchased an LC-1. Iíve spent the last two weeks reading and assembling the Megasquirt. I believe I now have everything except the harness and the idle control mod ready.
I do have a few outstanding questions:
--Trim the nylon screws? The nylon screws by the heat sink are longer than they need to be. They just barely touch the top of the case. Are there any drawbacks to trimming them? I have a photo at http://www.flickr.com/photos/28230598@N06/2654793944/
--Flux on the board. I cannot remove all flux from board. I still have a thin layer of haze. Iím using pure isopropyl alcohol. I started with 70% alcohol and, as the Megamanual warned, it didnít work. The 100% alcohol works much better, but how clean will the board need to be?
--Spray painting the board. The megamanual also recommends spraying a coat of Krylon Krystal spray paint to seal the board once everything is working and tested. I assume the processor must be removed, the socket masked, and the MAP sensor must be masked. Is there anything else? Should the proto area be masked?
--Preferred mounting location. I searched, but couldnít find a definitive answer to where the best place to mount the Megasquirt is. Since this is a later NA, the stock ECU is behind the passenger seat. I have not pulled back the carpet in the passenger footwell. Is the ECU location from the 1.6 NAs still open?
--Could anyone give my board a once-over. I posted pictures of the front and back of the board here http://www.flickr.com/photos/28230598@N06/2654794216/
The idle control mod kit has not been added (see next question.
--Installing the idle control mod kit. I found the instructions for the idle control mod kit on the DIYautotune site and in the megamanual. However, it isnít covered in the Braineak how to article. I did install the D8 and the R39. I also installed the Q16. I believe that the Q16 is only necessary for a Megasquirt II install. Can anyone verify that it is safe to remove it and use the spot for mounting the TIP120? With the Miata-specific mods, should I still remove D8 and jumper R39?
--I have had the hardest time tracking down the harness plugs. I have responded to a few for sale items on Miata.net classifieds, but I havenít received anything for the cash Iíve paid out. I did get Tyco to send two of the plugs by asking for samples. They wonít give out pins as samples, so Iím stuck. Can anyone give me a lead? Iíll even go by a junkyard, but I donít know of any in the area.
--Do I have my stimulator configured correctly? http://www.flickr.com/photos/28230598@N06/2653967045/
Switches 2 + 3 are on. All others are off. I have the 2nd trigger jumped to pin 25. It works in Megatune, but does this configuration accurately simulate the Miata?
--Finally, if anyone in Jacksonville wants to give me pointers in person, I'd appreciate the help.
Thanks in advance,