1976 280 Z from Ohio to Dubai

[BAS_DXB]

Conclusion on the onesixindustries CAS wiring with MS3Pro: CKP+ to pin D and CKP- to pin A, with pins B and C left unused.

The Honda COPS worked their magic and I completed my coil/spark testing.

I now work on the timing/advance and obviously getting some weird thing...

When doing the engine work and so one, we removed the oil pump and spindle and of course did not put it back correctly. So after manually cranking to TDC with valves cover popped open to ensure of the correct position, we fixed the spindle position to 11:25 small side on the left.

Then with the CAS cover open and tooth #1 (24-1) in front of the sensor, we placed the CAS correctly on the block, aligned with spindle, and spun it until the fixation hole was reachable. From this we manually cranked again in order to align tooth #1 to sensor and the reading on the pulley damper was 267* BTDC which seems odd but we followed the method to the dot... Any comments ?

11:25 spindle (engine front on the left)

My ignition / wheel decoder are as below at the moment, and I have on and off RPM sync. I loose the sync at the same time as my fuel pump relay clicks and get it back when clicks again, so not quite sure about the reason but obviously linked.

I then got an advice from Hussein at Protunerz (from where I got the CAS) to try alternating / semi-sequential and then change "number of plugs" to "wasted cop". Could not try as the workshop was closing...

I am also doubting on my firing order, this is what was also in MS3 manual, A1, E2, C3, F4, B5, D6. 

On 11/6/2020 at 6:09 AM, wheee! said:

Ever hear the story about the guy that wired his injectors and COPs for Haltech in 1-5-3-6-2-4 firing order instead 1-2-3-4-5-6 cylinder order?
Yeah, that’s me... I’m the idiot...

[BAS_DXB]

After further investigation, and also trying timing gun to determine BTDC... I still get around 270* 

Something bugged me from the tooth logs, first of all not 23 teeth and 1 tooth missing, and also a number of teeth that was changing...

I checked again my grounding, made sure the CAS wiring was correct and not close to coils/injectors/power wiring, already have my 10k resistor in series with the CAS (between CKP+ and CKP- wires), and still had these odd tooth log, so I opened the CAS (onesixindustries, 400$ piece of scrap ?).

To me, it seems like the CAS factory wheel/magnet adjustment was way to big... so I did my best to bring the magnet closer to the wheel, loosen up these 4 bolts. I could not try to take a tooth log today but will do tomorrow morning.

Any other suggestions on what could cause the VR sensor reading f*** up / missing teeth that I did not check as above ? Anyone faced the same issue with onesixindustries CAS or similar and fixed the issue ?

It would make sense that THIS is the problem causing the RPM to sync and unsync, because my BTDC seems "correct", but as the wheel is supposed to be 24-1 but only send input for 17-1 or 18-1 at the moment, then its obvious the ECU cannot cope and get RPM sync 100%.

[wheee!]

After further investigation, and also trying timing gun to determine BTDC... I still get around 270* 
Something bugged me from the tooth logs, first of all not 23 teeth and 1 tooth missing, and also a number of teeth that was changing...



I checked again my grounding, made sure the CAS wiring was correct and not close to coils/injectors/power wiring, already have my 10k resistor in series with the CAS (between CKP+ and CKP- wires), and still had these odd tooth log, so I opened the CAS (onesixindustries, 400$ piece of scrap ?).

To me, it seems like the CAS factory wheel/magnet adjustment was way to big... so I did my best to bring the magnet closer to the wheel, loosen up these 4 bolts. I could not try to take a tooth log today but will do tomorrow morning.
Any other suggestions on what could cause the VR sensor reading f*** up / missing teeth that I did not check as above ? Anyone faced the same issue with onesixindustries CAS or similar and fixed the issue ?
It would make sense that THIS is the problem causing the RPM to sync and unsync, because my BTDC seems "correct", but as the wheel is supposed to be 24-1 but only send input for 17-1 or 18-1 at the moment, then its obvious the ECU cannot cope and get RPM sync 100%.

Add 360 degrees to the timing. You might be on exhaust stroke.

[wheee!]

You have the old version obviously too.

[BAS_DXB]

13 minutes ago, wheee! said:

You have the old version obviously too.

You mean the V1 CAS ? I am not certain, as the V1 seems to have 24 teeth and no missing tooth and the V2 has 24-1.

https://drive.google.com/file/d/18emLJTYFfAXeZbeBEE8t25-17feUDXnL/view for V1

https://drive.google.com/file/d/1NEjB-zbjPaCB11_pICNsNU-8pCn6UEe8/view for V2 (This sensor is the same as commonly found on Toyota engines however with a modified trigger
wheel. A tooth has been machined off.)

[BAS_DXB]

18 minutes ago, wheee! said:

Add 360 degrees to the timing. You might be on exhaust stroke.

I made the TDC with the valve cover off, to ensure both valves are closed and cams up on cylinder 1, so should not be on the exhaust stroke correct ? I'll still try with 273+360 also tomorrow.

Thank you.

 

[wheee!]

My mistake. Yes, 24-1 is your setting. Second version.
Your using the D pin for signal or C? I use D as per Tim and that works for a good clean signal. I also use a sensor ground from the Haltech instead of the ground pin on the CAS.

[BAS_DXB]

38 minutes ago, wheee! said:

My mistake. Yes, 24-1 is your setting. Second version.
Your using the D pin for signal or C? I use D as per Tim and that works for a good clean signal. I also use a sensor ground from the Haltech instead of the ground pin on the CAS.

I use pin D for CKP+ indeed, and so far pin A for CKP-, but might try your setup with sensor ground from MS3 instead of A.

You always had all the 23 teeth and the missing one on your tooth log ?

[wheee!]

I have had both versions of the CAS. I have the 23-1 in the car now. It works perfect.

[wheee!]

What is your sensor voltage? ~.05 volts?

[BAS_DXB]

21 hours ago, wheee! said:

What is your sensor voltage? ~.05 volts?

Yes it is around these lines.

[BAS_DXB]

Great day today, the gap between the toothed wheel and the magnet in the CAS was the issue ! Got to love VR sensors. I adjusted it to .5mm and I now got all my teeth on the tooth log (as well as the missing one), and a perfect RPM sync. 😁

Following this great moment, I ran again the coils and injectors tests, check the other sensors and managed to get the engine started.

Now working on the idle and timing for fixed advance in order to be lean and match the required fuel calculated by the software. I am at 7ms now (previously calculated at 6.5 ms by tunerstudio, based on engine displacement 2800, number of cylinder 6, injector 480 and targeted air-fuel ratio 14.7).

Anyone using the ITB mode for control algorithm primary fuel load and ignition load ?

The timing for fixed advance is quite high at 20.

My initial tooth #1 angle was 272 and with the above setting, idling at around 750-800 rpm, the light gun shows 290-300 on the harmonic damper.