ok so igot a megasquirt with all thestuff i need to do to make it run with the stock cas an all that fun stuff. i have a adapter harness i got with the mega squirt. the guy who had it said he had his running an idle just never got a chance to tune it. just so you know its a 2.2v board with the lm1815 dual on it an all the good stuff. my main question is when i put it on the washer plug is on the emission harness. when i plug the mega squirt in is this going to kill my washers or will they still work.

also will it make a difference that i have s5 primaires an 850 low impedance secondaries should i leave the resistor box by the head light on the car cause im running right now with s5prims an s4seconds with a jumped resistor box. an i dont know if the mega squirt is able to change the settings to have two low imp an two high let me know

 

See http://www.aaroncake.net/rx-7/megasq...tockWiring.asp on how to preserve the wiper wiring.

As for your injectors, they all need to match. So you will need to wire resistors up to your low impedance injectors so all of them appear high impedance to the ECU.

 

thanks aaron hey also do i have to run the gm air intake an the gm temp sensor or cani use thestock

 

You can use the stock sensor, but with the 2.2 board and MS1 it is far easier to just use the GM sensors. Otherwise you need to change bias resistors and reflash the firmware with EasyTherm.

 

ok will do. Also on the water sensor can i use the plug on the back of the neck. The one for the water thermo an just tap it a little bigger to fit the gm on or is that used on the mega squirt. thanks for helping me aaron your a good guy.

 

There isn't a lot of room to tap on the back of the water pump housing, and to do so, it needs to be removed from the car. That's why I generally tap the front.

 

Haha, to me changing a resistor and reflashing firmware is FAR easier than tapping a new location for the water sensor. I can change the resistor and flash the firmware in 10 minutes!

Ken

 

That's very true - but - have you priced the Mazda sensors lately? $$$$ I went with the GM option primarily due to needing to replace a flaky OEM Mazda sensor. An $11.00 sensor, an $18.00 inline adapter in the top hose and a 0.25" hole drilled in the thermostat plate and I've never looked back.

 

so as of right nowim glad this happened my engine is going out an getting retard to start. So im going to rebuild it with new housings an seals before i put my mega squirt on. so i can havea little bit easier time starting it an tuning. so in a few weeks i will be back to ask for some help hahaha

 

I've never had to replace one so nope, never priced one.

Ken

 

Intake air temp for my 87 TII is $44 my cost as a mechanic. Retail on it was well over $60. That was going 3rd party. I didnt even bother as Mazda told me the list was $80-something. Stock sensors are horribly overpriced.

ALL HAIL THE MS!!!!!

 

Ok im back got it all back together an running. I plugged in my box today an there were some good signs an bad. The bad i cant get a signal from the box to the laptop. The good is i turned it over an its sparking my plugs. so thats good how would i not be getting a singal from the ms. when i turn the key on all three red led lights turn on.
heres my board

 

also the dude said he had it on his car running. So it might be my db9 cable but i have the driver downloaded from when i got the cable to run it. I try to fetch from ecu an it gives me a hour glass an nothing. It does show a car 1 an it has tons of stuff i need to look through it before im sure.

 

It is likely a laptop issue.

Are you using a built in serial port or a USB to serial adapter?

Do you have a straight through serial cable?

 

http://www.diyautotune.com/catalog/u...839af7fcfca8ca

for $20 its a bit expensive but works flawlessly

 

its a serial to usb. like its the one that plugs into the db9 on the megasquirt an then plugs into the computer. im starting to think its the plug but when i plug it in the back it prompts me on the corner an says new hardware found an ready.

 

Did you install the drivers?

What COM port is it on?

In Device Manager, access the properties of that COM port and in the Advanced window, crank the buffers down as small as they will go.

 

yeah i installed the driver off the disk i got when i bought it. its a ebay one i know that i bought it locally. but im pretty sure its com port 1 its just the default from when i down loaded megatune 2.25. imgoing to try to look threw it some more wednesday an thurdays cause im off. but ill keep you posted

 

COM1 is almost certainly used internally by the laptop for an internal COM port or for a modem. Set the USB adapter to something else.

 

okie dokie. How will i do that do i have to go into the megasquirt or on the laptop to change that. im going to try tomorrow i think i have a vac leak so im going to see whats up tomorrow an try to get this all in. Thank you aaron

 

It depends on the USB to serial adapter. In Device Manager, open up the properties of the USB to serial adapter. On one of the tabs will be an "Advanced" button. Usually in there you will find the COM port assignment. Pick COM4. While you are there, crank down the buffers.

 

but how do i change it. do i change it on the computer itself or in mega tune.

 

I just told you how to change it. Post #21.

 

yeah i read that but its not to clear. I mean do i go into system on the laptop go to device manager. Or is iton in the megatune software its self is what im asking. I know how to get to the driver on the usb an get into that butwhat im asking is if i have to go to the one on the laptop itself. Or is it on the megatune program

 

"It depends on the USB to serial adapter. In Device Manager, open up the properties of the USB to serial adapter. On one of the tabs will be an "Advanced" button. Usually in there you will find the COM port assignment. Pick COM4. While you are there, crank down the buffers."

Aaron can't make it simpler. Stop overthinking (?!) the situation and follow his instructions step by step.