MegaSquirt 2 with v.3.57
 

Hey guys just picked this ecu up, i also got the Relay bored with the harness that goes to ecu from relay bored or viceversa. i am wondering what do i need for the car to start/ run any specific sensors?!?!, I have a 1990 Rx7 Fc S5 Turbo 2.. so yea do i need any Hall sensor?, or any sensor???? or will the car run with all original sensors???. also does any one know how to wire the relay bored to the sensors and plugs?? i cant find that anywhere.. the relay bored says inj2 inj2 inj1 inj1 FP FIDLE s1 s2 s3 s4 s5 vraf TPS TPS reset Tach MAT MATRET CLT CLT RET O2? does anyone have a wiring diag for that? if so i would greatly appreciate it!!! so yea all in all please tell me what i need because im starting to get lost..lol:scratch:

Thanks guys!!

Best regards P.Burdon

Bummpp:(!! Aroncake please help lol!!

Bumps!!:)

Anyone got a wiring diag for the relay box to engine? S5 turbo 2?

Nobody is responding to your message because your questions are very well answered in the sticky threads at the top of this section of the forum.

I figured out the cas but i still cant find the diagram for the diyautotune relay box....!:(..

You don't really need that to be honest, but DIY should have a diagram for it. I have personally never used one before.

Most RX-7 people don't use the relay box because most RX-7s were already set up for EFI. The relay box is mainly handy for older vehicles set up for carbs.

The wiring should be very similar between the regular installation and with the box. All the sensor and injector connections will be basically the same, however the relay box will take the place of the relays and fuse panel.

It appears that the relay box uses screw terminals to make a connection to your harness, so that means you're probably making your own harness instead of modifying the DB37 side of the harness. Also don't forget dielectric grease on those screw terminals.

You don't need any hall sensors as the MegaSquirt will use the existing VR sensors in the CAS. Be aware that your S5 electric metering oil pump cannot be controlled via the 'Squirt.

I suggest you look at the sticky threads for some more information. In particular, my tutorial covers all the sensors you will need.

Hey aron cake, Thank you kindly for the help. here is what I am doing. im building a full race car (time attack) the only wiring I will have is going to be the engine harness, Race pack, rear brake switch, toggles for IGN, fuel pump, starter, acc, and etc.. so yes the car will have my own home made harness. would you be able to give me a link of the thread and if you know link for the relay box diag.. I would greatly appreciate it.

Best regards Pat. Burdon

Off hand I don't know any threads in which people have used the relay box in an RX-7 before. So I don't have any links to provide. Essentially you would follow the standard install in the documentation of the relay board, making the changes needed specifically for the RX-7.