MicroSquit Conversion, Giving this a try Options

[Mblizzard]

I am pretty happy with my stock FI. But after seeing some of the setups at Okteenerfest, I thought this might be worth trying.

The stock system is not easy to modify and get things running correctly. I spent a lot of time making minor adjustments by trial and error. While I am not looking for huge HP gains or anything, it is pretty clear that the mods I have could potentially benefit from a bit more precise control.

Going to start with fuel only at this point to get things going and see where it leads me. Any help or suggestions for set up would be appreciated.

[Mblizzard]

Still asking questions. A number of people have confirmed that the stock CHT will work with this system. Because this system is a bit more sensate to noise it is designed to have the grounds loop back to the unit or essentially use a 2 wire sender. Of course the stock CHT is a single wire that is grounded directly to the engine.

Most of the modern 2-wire units are 3/8 NPT and the stock CHT is 10 mm x 1. Very close I know but has anyone ever seen a 10mm x 1 to 3/8 NPT adaptor?

[jcd914]

Still asking questions. A number of people have confirmed that the stock CHT will work with this system. Because this system is a bit more sensate to noise it is designed to have the grounds loop back to the unit or essentially use a 2 wire sender. Of course the stock CHT is a single wire that is grounded directly to the engine.

Most of the modern 2-wire units are 3/8 NPT and the stock CHT is 10 mm x 1. Very close I know but has anyone ever seen a 10mm x 1 to 3/8 NPT adaptor?

I believe the 911 3.2 CHT is 10mm x 1.0mm and the later one "(1988 on? ) were 2 wire harnesses, including a ground wire.

Jim

[cgnj]

Hi,

I thought about about all of these issues while I was planning how to execute my MS conversion. Just replacing or repairing the stock MPS will cover most of the cost of the conversion.

If I were going to do a motor up to 2056, this is what I would do.

Microsquirt so all the controls can be in the engine bay and it will be easier to revert back to stock.
Crank position sensor and trigger wheel.
Cam position sensor
Coil on plug

1.8 plenum or a vanagon 2.1 plenum. (I measured the volume of these. There was a negligible difference). Vanagon plenum will allow a larger throttle body without as much work. I will have to check, but I think the vanagon throttle body is marginally bigger than the stock 2.0. I had a discussion with a member regarding these style plenums vs. 2.0 plenum. The theory is that the intake charge loses less velocity since it doesn't hit the floor before entering the runner.

I think this ends up being the cleanest installation.

My two cents, feel free to flame me.

Carlos