So I'm putting a MegaSquirt standalone ECU in my '88 turbo.
I love simplifying my engine as much as possible, the millions of vacuum hoses on rotaries drive me crazy.
I've always wanted to take that rats nest of vacuum hoses and sensors/solenoids/whatever else on the right side (looking in from the front of the car) of the engine, the ones with the orange, grey, green, and blue square plugs. I attached a couple pictures to show what I'm talking about (just an obvious note that the intercooler and throttle body are removed).
Can I remove these now that I'm going standalone? In my repair manual wiring schematic it seems like those all go straight to the stock CPU (correct me if I'm wrong?). I've already removed my air pump and ACV off the left side, so I think most of these are null anyway, since there's 3 plugged vacuum pipes on the left side where they connected to the ACV.
Just don't want to remove them if they're doing something important.

 

More information is needed, such as what series engine and turbo or non.

Though judging from the picture itself I can infer its at least a turbo 2nd gen. All of those solenoids are strictly for emissions purposes and you can lose all of them if youve deleted the emissions equipment.

 

It's an 88, so an s4, and it is turbo

 

Thanks for that though, I guess I know tomorrows project
Is there ANY of it that I should keep? Can I even remove the one circled in yellow in the new picture I attached?
Anyone else have anything to add?

 

Oops, here's that picture I mentioned :P

 

so does removing all emissions equipment but using stock ecu to run motor affect performance of engine???

 

As far as I know, it shouldnt really affect your performance. The only changes should be a lower, less even idle, and easier troubleshooting if you have any vacuum related problems (plus a cleaner looking engine with less pieces hangin off it)

 

thanks appreciate it

 

OK, to clear some things up, you need to perform a full emissions removal. That means all the solenoids, ACV, air pump. See the 2nd gen FAQ for emissions removal info. There are some nicely coloured vacuum diagrams around.

Keep the purge system and route it through a generic parts store PCV valve.

I'd suggest keeping the twin scroll system, using the stock solenoid, and then actuating it via one of the spare outputs on the Megasquirt.

You can remove the thermowax, secondary throttle plates, and cold start cam. The Megasquirt will use the BAC valve to idle the engine high during cold starts.

If you wish to run a cat, first tune the car with a test pipe and then swap in the cat after it is tuned.