2 datalogs done back to back, look totally different

[RedGT45]

I did datalog 1 about 5 minutes before datalog 2. Neither were very clean pulls, I was just kind of messing around but then got spoked at what I saw on datalog 1. What could be the explanation for it running so lean? The car has a procharger HO kit with procharger's tune.

datalog 1

datalog 2

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[brianbr]

Looks like the pcm is limiting torque by leaning it out. Your log shows torque source 1 instead of 0 at wot. Did you have traction control on? if so and its safe to do so, try a pull with it off. If it stays lean don't ride it out.

 

[markmurfie]

Both logs look rich to me, fuel is correct because of the trims, but isn't being controlled. Log 1 didn't seem to stay in power enrichment fueling, it started commanding stoich after the shift.

Torque source 1 is in both logs, It should be 0. This could be causing intermittent fuel control problems as the ECU decides how it wants to limit torque. You could try the old trick of flashing the stock tune back on, then reflashing what you have for the latest tune.

Desired throttle angle in log2 is concerning. I would really check your BOV, and make sure it has a good consistent signal to the manifold vacuum/pressure. Use a vaccum line thats reinforced and not expanding or collapsing. Make sure it is run well with no pinch points, serious bends, or touching anything that gets hot. Verify your BOV is closing and opening with out much delay. Your BOV is very important to consistency in throttle operation when the MAF is in a blow through configuration. It deserves its own dedicated manifold vacuum line if possible.

 

[RedGT45]

Traction control was on for datalog 1, and off on datalog 2. I did read that torque source 1 - torque truncation, does use fuel to limit torque. I did a third datalog and got torque source 1, but the car went into power enrichment and everything seemed normal.

I will double-check the BOV, the way the vacuum line is being ran to it, it could be pinching if it moves. Im going to order a more rigid line just to be safe, but I left the filter off ( it the pro flow valve) and it sounds normal.

 

[brianbr]

Traction control was on for datalog 1, and off on datalog 2. I did read that torque source 1 - torque truncation, does use fuel to limit torque. I did a third datalog and got torque source 1, but the car went into power enrichment and everything seemed normal.

If you look at the 1st log where you went wot it looks like it picked up some wheelspin and used enleanment to limit torque.

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