First DM recording
- Thread starter sy1907
- Start date
sy1907
SYCOTIC
Guys and Gals, if you could offer any suggestions, that would be great. I know my truck runs hotter than optimal, the previous owner supposidly put a 160 in it, but I'm going back to a 180. I just want to know if you think I have lots of knock, spark advance, and injector pulse and such. If you don't want to help, sorry for cluttering the board. FWIW, I've learned a ton from being part of this board.
Check the cooling system and thermostat. That is kinda hot for stock heads.
You have no WOT on that recording. I don't see anything scary enough to not do it. If you thought you were WOT then check and make sure you are getting full throttle travel and then check the TPS.
Also here is some stuff BG put up a while back. Will give you a general idea although make sure you look at the whole picture.
****02 millivolt readings
at startup - should be rich/slightly rich (02 is not warmed up, but warms up quickly, and engine needs to be rich at start/warmup)
at idle/cruise once warmed up, you will see 02 values flicker all over, crosscounting across 450mv.
at WOT/full boost, you should see them in the 900-1000 range. I've seen them in the 800s, but for the *most* part, 900s is safe. You need to watch your truck and apply other tuning skills to find out what works best for your truck
****Knock retard - want to see zero, but hardly any trucks see this. A couple degrees during shifts is normal, but ideal is zero, again.
****Integrator
128 is neutral (zero), this will change on the fly a lot once the truck is warmed up and in closed loop. I'd say the normal range is 100-140. Datamaster gives you the option of using S terms (short term fueling trim). 128 is zero, 141 is 10% richer, 115 is 10% leaner, for reference. Crosscounts or xcounts is a running counter of the number of times the 02 readings have crossed 450, going lean, or going rich. This number will overflow at 255 and begin again. At closed loop, this value should be moving pretty fast. It is a good indication of how well your closed loop system is working (or not).
****- Block Learn Memory
This value is an attempt by the computer to try to adjust for long term fueling adjustments, due to engine wear, or anything that may change the fuel needs of the motor. We have only 2 cells in our trucks, open or closed throttle. So you may see your values change when you open or close your throttle. 128 is neutral, once again. I'd say you have some issues that need looking at if you are outside the window of 115-140.
****Timing - you will see 20-30 at idle/cruise, and should see 12-15 at WOT/full boost. Racier chips will push the timing values at WOT to 17-19 possibly.
*****Wastegate duty cycle -
100% is the solenoid is fully closed, 0% is fully open. Think of it this way, at 100%, the ECM is desiring more boost, at 0% the ECM is desiring less boost.
*****AFR target is NOT an air fuel reading. It is a programmed value in the ECM for a fueling multiplier. So at start/warmup, you will see richer AFRs until it is warmed up, when you will see it go to 14.7. Once you go into Power Enrichment mode (you floor it), the AFR will go richer, to 11-12:1 ratios, depending on chip programming, and based off of RPM.
*****IA temp /MAT
20-40 degrees above ambient are typical. You can watch this value increase with heat soak, or if an intercooler pump is dead. EGR will raise air temps as well, usually 40-60 degrees above ambient.
*****EGR stuff -
EGR duty cycle will kick in during light cruise conditions, unless it is disabled in the chip, or not enabled due to other conditions.
*****IAC - 10-30 at idle is about normal. Adjusting the throttle stop can manipulate this value, as you are creating a slight vacuum leak.
*****Battery voltage - 13s are good, at WOT is very important, 13.4+ being very good at WOT. This will have huge effects on performance.
I believe these to be the most important ones.
Watch when trouble spots are occurring, during WOT, during shifts (graph RPM vs MPH), at boost spikes, at knock, at lean spots (02s dip horrendously). Finding correlations is a start for identifying problems, but be sure it is a cause and not a symptom. (I have low 02s because I have lots of knock...) Watch the changes you can make on a datalogger with actual changes to the truck. Make performance logs to document what helped or hurt. Take notes so you learn from your experience and can share, or at least know your truck better
You have no WOT on that recording. I don't see anything scary enough to not do it. If you thought you were WOT then check and make sure you are getting full throttle travel and then check the TPS.
Also here is some stuff BG put up a while back. Will give you a general idea although make sure you look at the whole picture.
****02 millivolt readings
at startup - should be rich/slightly rich (02 is not warmed up, but warms up quickly, and engine needs to be rich at start/warmup)
at idle/cruise once warmed up, you will see 02 values flicker all over, crosscounting across 450mv.
at WOT/full boost, you should see them in the 900-1000 range. I've seen them in the 800s, but for the *most* part, 900s is safe. You need to watch your truck and apply other tuning skills to find out what works best for your truck
****Knock retard - want to see zero, but hardly any trucks see this. A couple degrees during shifts is normal, but ideal is zero, again.
****Integrator
128 is neutral (zero), this will change on the fly a lot once the truck is warmed up and in closed loop. I'd say the normal range is 100-140. Datamaster gives you the option of using S terms (short term fueling trim). 128 is zero, 141 is 10% richer, 115 is 10% leaner, for reference. Crosscounts or xcounts is a running counter of the number of times the 02 readings have crossed 450, going lean, or going rich. This number will overflow at 255 and begin again. At closed loop, this value should be moving pretty fast. It is a good indication of how well your closed loop system is working (or not).
****- Block Learn Memory
This value is an attempt by the computer to try to adjust for long term fueling adjustments, due to engine wear, or anything that may change the fuel needs of the motor. We have only 2 cells in our trucks, open or closed throttle. So you may see your values change when you open or close your throttle. 128 is neutral, once again. I'd say you have some issues that need looking at if you are outside the window of 115-140.
****Timing - you will see 20-30 at idle/cruise, and should see 12-15 at WOT/full boost. Racier chips will push the timing values at WOT to 17-19 possibly.
*****Wastegate duty cycle -
100% is the solenoid is fully closed, 0% is fully open. Think of it this way, at 100%, the ECM is desiring more boost, at 0% the ECM is desiring less boost.
*****AFR target is NOT an air fuel reading. It is a programmed value in the ECM for a fueling multiplier. So at start/warmup, you will see richer AFRs until it is warmed up, when you will see it go to 14.7. Once you go into Power Enrichment mode (you floor it), the AFR will go richer, to 11-12:1 ratios, depending on chip programming, and based off of RPM.
*****IA temp /MAT
20-40 degrees above ambient are typical. You can watch this value increase with heat soak, or if an intercooler pump is dead. EGR will raise air temps as well, usually 40-60 degrees above ambient.
*****EGR stuff -
EGR duty cycle will kick in during light cruise conditions, unless it is disabled in the chip, or not enabled due to other conditions.
*****IAC - 10-30 at idle is about normal. Adjusting the throttle stop can manipulate this value, as you are creating a slight vacuum leak.
*****Battery voltage - 13s are good, at WOT is very important, 13.4+ being very good at WOT. This will have huge effects on performance.
I believe these to be the most important ones.
Watch when trouble spots are occurring, during WOT, during shifts (graph RPM vs MPH), at boost spikes, at knock, at lean spots (02s dip horrendously). Finding correlations is a start for identifying problems, but be sure it is a cause and not a symptom. (I have low 02s because I have lots of knock...) Watch the changes you can make on a datalogger with actual changes to the truck. Make performance logs to document what helped or hurt. Take notes so you learn from your experience and can share, or at least know your truck better
sy1907
SYCOTIC
sy769, the guy i bought the truck from claimed the first owner put in a 160 thermo :drinking: , went to replace today and found a 195!!!! WTF!? Now i have a 160 for sure. Thanks for trying to help, I appreciate your responses so far. I had already been looking at the page you posted that BG put up, but thanks for that ne ways.