GdB
Veteran Member
Wow! Here is the difference between a 1qt overfilled 01M Auto tranny, and properly filled.
Hwy only, > 55MPH: 86% -> 95% (10% improvement)
Mixed Hwy (~10miles) and street (~2miles): 72% -> 87% (15% improvement)
I was getting bad MPG and sluggish response at low throttle settings, just off idle, so I was trying to figure it out.
I thought my auto tranny was going bad, so I did a VAG-COM log of the engine blocks 001 and 006, and combined the data with an improved version of the 9624MPG spreadsheet that I downloaded from TDIclub. My sample rate was very low so accuraccy was limited. So I averaged over all the data to fix that. I calculated mechanical efficiency from power (measured, drag, & mech. required).
So I confirmed that my tranny was a pig, very inefficient! A few days later, I just happed to notice the correct procedure for filling the tranny, "01M 4 Speed Automatic Fluid change Procedure.pdf" or "autoFluidchange.pdf". I realized I goofed because I assumed it was like another auto tranny I had done. Since I knew it was overfilled, I just had to drain out a bit. For me, the VW procedure is overly complicated with the temp stuff, using VAG-COM to measure temp! My locale temp. was close, and the engine was cold, so all I had to do was put the allen wrench on to the drain plug, and lose 1qt!
So I drove it and notice the sluggishness had improved a lot, and the tranny seems to behave better in general. Was it just real, or was I thinking wishfully? And how much will my milelage improve?
So I redid the VAG-COM log and plugged it into my xls file and wow!
I think my injectors might still be a little clogged, since part thottle is still not a responsive as my wifes 2003 Jetta Wagon TDI, Auto
Finally I should now do 10 to 15% better than 35MPG! Maybe 40MPG?
Hwy only, > 55MPH: 86% -> 95% (10% improvement)
Mixed Hwy (~10miles) and street (~2miles): 72% -> 87% (15% improvement)
I was getting bad MPG and sluggish response at low throttle settings, just off idle, so I was trying to figure it out.
I thought my auto tranny was going bad, so I did a VAG-COM log of the engine blocks 001 and 006, and combined the data with an improved version of the 9624MPG spreadsheet that I downloaded from TDIclub. My sample rate was very low so accuraccy was limited. So I averaged over all the data to fix that. I calculated mechanical efficiency from power (measured, drag, & mech. required).
So I confirmed that my tranny was a pig, very inefficient! A few days later, I just happed to notice the correct procedure for filling the tranny, "01M 4 Speed Automatic Fluid change Procedure.pdf" or "autoFluidchange.pdf". I realized I goofed because I assumed it was like another auto tranny I had done. Since I knew it was overfilled, I just had to drain out a bit. For me, the VW procedure is overly complicated with the temp stuff, using VAG-COM to measure temp! My locale temp. was close, and the engine was cold, so all I had to do was put the allen wrench on to the drain plug, and lose 1qt!
So I drove it and notice the sluggishness had improved a lot, and the tranny seems to behave better in general. Was it just real, or was I thinking wishfully? And how much will my milelage improve?
So I redid the VAG-COM log and plugged it into my xls file and wow!
I think my injectors might still be a little clogged, since part thottle is still not a responsive as my wifes 2003 Jetta Wagon TDI, Auto
Finally I should now do 10 to 15% better than 35MPG! Maybe 40MPG?