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Trigger Wizard vs Timing Table? (PIP SAW)


cygnusx1

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OK I got the EDIS6 working with the dodge coil and MSII v3.0.

 

I was able to get the trigger angle and the timing light on cylinder 1, to both read the same number. Now the Megatune Dial Gauge reads the same as the Trigger wizard which both agree with the timing light.

 

The problem is that the Tuning Map differs. I can raise and lower the timing via the tuning grid but the numbers never match. They are off by about 8 degrees.

 

Light reads about 20 at idle and the Tuning Map reads 28?

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Do you mean the spark table value that is highlighted while idling shows 28, but you timing light reads 20? Remember that the table is interpolated so if the previous cell is 16 and this cell is 28, but your rpm or map is in between you will get a value in between.

 

And, the megatune dial gauge will be showing the interpolated value from the spark table. So it sounds like you are working OK. To verify you can always set the entire table or at least a portion of it to a fixed value of 28 and make sure the megatune gauge shows that and the timing shows that.

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The 3D Graph Tuning table shows the actual real time advance value under the graph. When I am in the 3D graph and tweaking the timing with the shift and arrow key, I see the changes in the shown value below the graph. Suppose it says around 28deg as it's idling. When I close the 3D Tuning graph and go back to the Megatune Gauges they are reading 20deg and not the 28 that was showing below the graph.

 

The tuning graph is the only thing that is off. The MT gauge, the trigger wizard and the timing light all agree with eachother.

 

I am going back to play in the garage. BBL to report. I will screenshot if I can.

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Are you sure that your timing tab and crank damper actually line up at #1 TDC?

 

What do you have the trim angle set to, 8 deg?

 

I have seen a discrepancy between actual timing and the MT gauge. The timing table is always accurate.

 

Pete

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Rough guesstimate is that my missing tooth is about 5 teeth after the VR at TDC. I was off by almost one tooth after all the grinding and filing to clear the belts and AC pulley. 8 degrees is almost one tooth. With PIP/SAW unplugged, it runs somewhere near ZERO TDC. Coincidence that my map is off 8 degrees from the light?

 

Hmmm my laptop battery was dead so I worked on tying up loose ends tonight. Tomorrow I'll investigate further. Thanks for the hint Pete.

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Your trigger wheel sensor alignment is off. Limp home mode is 10 deg BTC, so if it is reading 0 deg, you are 10 deg off. Use the timing trim angle to compensate. The map should match the light. Ignore the MT gauge, it is a bug.

 

It is late....

 

Pete

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OK I took time tonight to double check everything. There are NO issues AFAIK. I got the timing light to agree with the Trigger wizard by going to -6.00. That tells me that my tooth wheel is mounted off by 6 degrees I suppose??

 

Anyhow, the trigger wizard agrees with the light, the megatune gauge agrees, and so do all the tuning tables. I guess I saw an anomally last time where one table was reading differently.

 

Here is the MSQ and Datalog from tonight. The MSQ has one pass through the VE analyzer in DataLogViewer.

MSII-V3-EDIS6.zip

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Nice work Dave, looks good. I am wondering if the advance gauge vs. timing map not matching is a bug in Extra code. That is what I was running on the supercharged engine, and there was always an offset between them (equal to the trigger angle offset).

 

It is not a big deal being off a few degrees, as long as you catch it before pushing the boost up. Let the software compensate for it (a lot easier than remounting the sensor).

 

Pete

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