Hesitation and high KR Cold weather issues?

[FoMoCoSHO]

With SCT, I can turn 6 of the available data streams into gauges then I can pull the curser across time/rpm and see what is happening at every data point, if that makes any sense.

[ShoBoat]

With SCT, I can turn 6 of the available data streams into gauges then I can pull the curser across time/rpm and see what is happening at every data point, if that makes any sense.

I can do something similar in Forscan, there is a button at the bottom of the screen that will show me the values in sequence. No gauges though.


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[FoMoCoSHO]

With SCT, I can turn 6 of the available data streams into gauges then I can pull the curser across time/rpm and see what is happening at every data point, if that makes any sense.

I can do something similar in Forscan, there is a button at the bottom of the screen that will show me the values in sequence. No gauges though.


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Was your LPFP replaced on the recall?

[ShoBoat]

With SCT, I can turn 6 of the available data streams into gauges then I can pull the curser across time/rpm and see what is happening at every data point, if that makes any sense.

I can do something similar in Forscan, there is a button at the bottom of the screen that will show me the values in sequence. No gauges though.


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Was your LPFP replaced on the recall?

Yes it was replaced.

[FoMoCoSHO]

Have you logged it to make sure it isn't dropping out?

[ShoBoat]

Yes the logs also show LP side of the fuel system on the other page. It doesn't look to me like its dropping out much.


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[SHOdded]

From the graphs, I'm only seeing the problem when you STAY on the throttle.  On the 55mph 2nd run w/ V7 is where the problem manifested itself.

[ShoBoat]

From the graphs, I'm only seeing the problem when you STAY on the throttle.  On the 55mph 2nd run w/ V7 is where the problem manifested itself.

Agreed, however the stock tune modulates the throttle plate even though it's at WOT on the AP sensor. The tune file send the command to the TP and its wide open through the whole pull. This is the only difference I can see from the logs. And the drop in HPFP.


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[BiGMaC]

From the graphs, I'm only seeing the problem when you STAY on the throttle.  On the 55mph 2nd run w/ V7 is where the problem manifested itself.

Agreed, however the stock tune modulates the throttle plate even though it's at WOT on the AP sensor. The tune file send the command to the TP and its wide open through the whole pull. This is the only difference I can see from the logs. And the drop in HPFP.


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Agree x3^^^
Bettin' on the fuel control module... If the LPFP is working properly...

[SHOnUup]

TSB - 13s04-s4 Fuel delivery module?

Rich

[AJP turbo]

Are you suspecting there is a problem with fuel delivery because the pressure dropping?

[ShoBoat]

I am being drawn back to the winter fuel (again). I have to do some more research on its effects on AFR and lambda. 


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[AJP turbo]

I am being drawn back to the winter fuel (again). I have to do some more research on its effects on AFR and lambda. 


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What do u mean?

The O2's will take care of afr and lambda via stft ....and u will never maintain commanded fuel pressure of 2000 or so when at wot with a 3 bar tune...u are pushing the fuel system to the max more specifically the high pressure pump...I think I said this before but I'm commanding 2200 and I'm lucky to see 1000 ..when I'm at 18 psi below 3000 rpm I'm lower than 1000 psi rail pressure

[91hybrid]

I am being drawn back to the winter fuel (again). I have to do some more research on its effects on AFR and lambda. 


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What do u mean?

The O2's will take care of afr and lambda via stft ....and u will never maintain commanded fuel pressure of 2000 or so when at wot with a 3 bar tune...u are pushing the fuel system to the max more specifically the high pressure pump...I think I said this before but I'm commanding 2200 and I'm lucky to see 1000 ..when I'm at 18 psi below 3000 rpm I'm lower than 1000 psi rail pressure

Even with meth this is still true, however lamba's are kept in check but the additional fuel is using 100% meth that is.

[SHOnUup]

I see 2100 at WOT all the time. Actually closer to 2200 most the time. Hmmm?

Rich