Subaru STI 2 VVT

[AbatelliCristian]

Hi guys,
I have Test subaru 36-2-2-2 vvt decoder, but I have no sync.
With normal 36-2-2-2 in semisequential and wastedcop engine start well, but with 36-2-2-2 VVT not sync.
Is correct my composite log?

[jsmcortina]

Try the other cam?

Did you edit the log you posted? The "header" lines are missing and MegaLogViewer wouldn't read it until I put them back in.
Once I'd opened it, I can see that the cam signal is just a regular pulse-train. The 36-2-2-2 VVT pattern is expected to be a 4-1 pattern.

James

[AbatelliCristian]

Hi James,
No I dont' have edit the log.. I attach other log
I don't have tried other cam. Now I will try this day. But is correct 3 teeth for second CAM? VVT work with 3 teeth?

Thanks for your help

Best Regards
Cristian

[jsmcortina]

But is correct 3 teeth for second CAM? VVT work with 3 teeth?

The engines I have previously helped with had a 3 tooth (4-1) pattern on the cam. This gives phase identification and cam position.

James

[AbatelliCristian]

Hi James,
sorry my question is incorrect.
Now I have tried only one cam and in this log I see 3 teeth 120 degress (4-1 I suppose is 90 degress). I dont know if second cam have 4-1. I will check. My quetion is: the actual code, VVT work with second cam 120 degress or the code is write for 4-1 both cam?

Thanks

Best regards

[jsmcortina]

Not sure, take a log of the other cam and post it up.

James

[tpsretard2]

For this engine, the crank and main cam trigger are the 36-2-2-2 and 2 teeth.

For cam phase each will have a patter of 4-1 with a 90deg spacing. Would love this engine to have the vvt decoder for ms. i would convert my engine to this next year if you do...

[AbatelliCristian]

Hi tpsretard2,
Are you sure this engine have 2 teeth for vvt cam? in my log is 3 teeth.
In this week I test second cam and make new log

[tpsretard2]

Oh crap.....

Totally forgot you probably had a US spec engine.

The US spec GT/WRX/STI engines have an even spaced 3 tooth pattern on the back of the cam for the cam phase information.
The engines for the rest of the world were 4-1.

Both use the same 2 teeth for the home trigger.
45 crank degrees before Cyl 1 TDC, then 135 crank degrees after TDC

[jsmcortina]

I know of the two variants - 3 tooth and 4-1. Both have run VVT on MS3.

James

[Matt Cramer]

I have also seen it refuse to sync when the active cam trigger edge was set backwards.

[AbatelliCristian]

In this days my customer don't have time for new test, but today I have see other subaru VVT engine disassembled.
It have 3 sensor in the cam. 1 with 2 teeth (phase), 2 for cam VVT position 4 teeth. I don't understand, because in the composite log of my customar I see 3 teeth in the cam. Different engine model? bhu... I investigate next days.
Attach photo of the engine disassembled

Best Regards
Cristian

[jhoefer]

I know of the two variants - 3 tooth and 4-1. Both have run VVT on MS3.

James

There's at least 4 patterns on the cams that I know of. There's a 3 tooth (actually cut slots) with no missing teeth for the H6 engines, there's a 4-1 (cut slots) for the USDM EJ25 intake-only system, there's a 4-1 (cut slots) intake + 2 tooth (cut slots) exhaust for the USDM dual AVCS system, and there is a 4 tooth (projecting teeth) with no missing teeth for the JDM EJ20 v7-10 intake-only system. That's just on the cams themselves, I believe the intake cam pulley for the 36-2-2-2 crank patterns is a 4-2 tooth wheel.

If you already support the 3 and 4-1 variants, would MS also support the JDM 4 tooth? Those engines are pretty common swaps and are all over ebay and such.

[AbatelliCristian]

Hi James, I have investing. Is correct my previous post with photo.
Subaru STI have 3 sensor in the cam. 1 with 2 teeth (phase), 2 for cam VVT position 4 teeth linear.

Is possible insert this pattern?


Regards
Cristian

[AbatelliCristian]

news for this decoder?

[jsmcortina]

Please post a composite log.

James

[AbatelliCristian]

This composite log is with 36-2-2-2VVt decoder.

In rising I have I dont' see cam sensor and cranck sensor not inverted


Now the car run with 36-2-2-2 without VVT in rising adge (last log)

[jsmcortina]

This composite log is with 36-2-2-2VVt decoder.

In rising I have I dont' see cam sensor and cranck sensor not inverted

Is this with MLV 4.1.01 ?
I think it is a new rendering bug. I'm having a problem too.

James

[jsmcortina]

Try with the crank set to falling and with "flip polarity on cam" enabled.

I've reported the composite logger rendering issue.

James

[AbatelliCristian]

Is this with MLV 4.1.01 ?

Yes

Try with the crank set to falling and with "flip polarity on cam" enabled.

I make new composite log.


In this code do you think you will use all 3 sensor? one for phase and 2 indipendent for VVT such as STOCK ?

Thanks
Best Regards

Cristian