Well That Escalated Quickly

[tiger_e30]

The machine shop took off the crankshaft 3 in 1 pully and harmonic balancer as one piece. On reinstall aby reason to not just slide the entire assembly on and use the 22mm bolt to tighten everything?

To answer my own question can't see the mark on the harmonic balancer to line up with the timing cover when the the whole thing is a assembly

[tiger_e30]

The machine shop took off the crankshaft 3 in 1 pully and harmonic balancer as one piece. On reinstall aby reason to not just slide the entire assembly on and use the 22mm bolt to tighten everything?

[tiger_e30]

Most computers ground the o2 control relay. Should have battery feed to the relay, and the computer controls the ground.

Connected pin 23 to ground on the proto area and it works! Next up figure out if its controlling idle correctly and why the motherboard tach output is wrong

[tiger_e30]

Most computers ground the o2 control relay. Should have battery feed to the relay, and the computer controls the ground.

Thank you that makes sense. The Bentley and electrical trouble shooting book don't actually have any diagrams of the motronic and relay circuits. Going to jump it to ground and make sure that works then figure out what to jumper on the board

[tyeler18]

Nope the megasquirt isn't putting voltage to the relay

Most computers ground the o2 control relay. Should have battery feed to the relay, and the computer controls the ground.

[tiger_e30]

The oxygen sensor heater circuit should have 12 V between terminals 4(+) and 3(-) at the harness side of oxygen sensor connector (the pin side) with the ignition on.

Nope the megasquirt isn't putting voltage to the relay

[jeenyus]

The oxygen sensor heater circuit should have 12 V between terminals 4(+) and 3(-) at the harness side of oxygen sensor connector (the pin side) with the ignition on.

[tiger_e30]

Anyone know what voltage the ecu supplies to the o2 heater relay? Trying to figure out where to wire pin 23

[tiger_e30]

Found out the pnp isn't wired to control the stock 02 sensor so the relay isn't powering up for lc2

[tiger_e30]

Wired in the lc-2 using the stock o2 sensor cable and connector I added what the wire colors and pins were for my application below. The lc2 has a wideband and narrowband output

[tiger_e30]

I was able to calibrate my IAT and coolant sensor. Is it normal for the coolant sensor to be at around 60 and fuel pressure at 140kpa when I just have the MSPNP on the bench not connected to the car? I was unable to calibrate the stock TPs. Do my maps look reasonable? Also any idea why dash rpm would be off vs mspnp

[tiger_e30]

Hooked up a used Diyautotune plug and play today. The good news is it started but it sounded rough and the tach didn't match tuner studio. Still running Naturally Aspirated with a narrow band O2 but I hooked up the pressure line and installed a GM IAT. Never worked with megasquirt before but it looked like the coolant temp wasn't working. Any idea where I am going wrong?

[tiger_e30]

Where did you get the pistons from? OEM Overbore?

https://www.autohausaz.com/pn/11251714810

[Conrad311]

also interested in the pistons. I just picked up an eta block for a similar build and am trying to source the parts for a possible over bore if needed.

[2mAn]

Where did you get the pistons from? OEM Overbore?