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Hesitation and high KR Cold weather issues?
- Thread starter ShoBoat
- Start date
FoMoCoSHO said: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 said:FoMoCoSHO said: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 said:Was your LPFP replaced on the recall?ShoBoat said:FoMoCoSHO said: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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Yes it was replaced.
SHOdded said: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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ShoBoat said:SHOdded said: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...
ShoBoat said: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
ajpturbo said:ShoBoat said: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.
"Lambda is lambda regardless of the fuel. If you're targeting and tuning to a lambda reading, changing fuel to something like MS109 will require more fuel to reach the same lambda. . So you should see an increase in injector duty cycle." I am guessing this also applies to "winter gas"
A good read here.
http://www.yellowbullet.com/forum/showthread.php?t=244066#/enter
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A good read here.
http://www.yellowbullet.com/forum/showthread.php?t=244066#/enter
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SHOnUup said:I see 2100 at WOT all the time. Actually closer to 2200 most the time. Hmmm?
Rich
Then you have room for more boost...that doesn't surprise me as most people with 3 bar tunes are only running 14-16 psi.....that can be easily done with the stock map sensor...and spare me the 14.7 psi limit...the 5v limit of the stock sensor actually may extrapolate closer to 17 psi and the stft would handle boost spikes even tho the sensor couldn't read anything higher....basically I don't know that the 2 bar is actually 2 bar
And rich if u had the tranny locked to avoid a downshift at wot and u could hold 2000rpm ur fuel pressure would plummet when boost rises
So do I. But I bet you your car is not programmed like apj's as your car will not allow you to lug a gear below 3000 and build substantial boost. I imagine it down shifts instead, which keeps the hpfp spinning fast enough to supply the pressure needed.
Plus those lme boys don't like adding boost above 15psi so I'm doubt your tune is asking for that much fuel below 3k in anything past 2nd gear.
I may be 100% wrong as I have never even seen your car, so my assumptions could be way off.
Plus those lme boys don't like adding boost above 15psi so I'm doubt your tune is asking for that much fuel below 3k in anything past 2nd gear.
I may be 100% wrong as I have never even seen your car, so my assumptions could be way off.
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