ndamico
Vendor , w/Business number
- Joined
- Mar 20, 2008
- Location
- Sacramento, CA
- TDI
- 2003 Golf 2Dr TDI, 2003 Jetta TDI, 2003 Jetta Wagon TDI, 2002 Duramax, 2003 Duramax
First off I know automatics get worse mileage. Here is the scenario. My friend and I both have 2003 Jetta TDI's. mine is a manual w/ 114k on it and his is an auto with 78k on it. both have same size tires. Mine is a GLS, his is a GL. Mine get great mileage (Upper 40's) and his is stuck in the mid to high 20's...
Observations/what we've done:
Mine is substantially faster (i know mine is a manual and his isn't)
We have removed the snow screens from both cars (they were both plugged)
we have reaplced the air filters and fuel filters with OEM replacements.
Both cars idle smooth, start the same, run quietly and otherwise appear just fine.
I have made a few datalogs with Vag-Com which i will attach. I just got the software a week ago and haven't had much time to use it.
However as i said his mileage somewhat sucks and mine is great and we are having a very hard time believe its just because his is an auto.
any help would be greatly apprecaited!
Here is my acutal vs desired timing.. scale on timing is 10*:
Here is the same thing from the auto with poor mileage...scale on timing is set to 20*:
it appears his may be off more at low RPM, but does it matter?
Here is the automatic's MAF data. it does appear under WOT the the maf reading for actual will start to fall. is this ok?
Here is a screenshot of his measuing blocks i took:
Lastly, after he left my house i realized how to get the timing plug-in to VAG-COM to work . Here is what it shows on my vehicle. It says "Timing within spec, slightly advanced". is that good?
Thank you again. I've found this site invaluable. I come from the Duramax diesel family so i'm new to TDI's but not to diesels.
Observations/what we've done:
Mine is substantially faster (i know mine is a manual and his isn't)
We have removed the snow screens from both cars (they were both plugged)
we have reaplced the air filters and fuel filters with OEM replacements.
Both cars idle smooth, start the same, run quietly and otherwise appear just fine.
I have made a few datalogs with Vag-Com which i will attach. I just got the software a week ago and haven't had much time to use it.
However as i said his mileage somewhat sucks and mine is great and we are having a very hard time believe its just because his is an auto.
any help would be greatly apprecaited!
Here is my acutal vs desired timing.. scale on timing is 10*:
Here is the same thing from the auto with poor mileage...scale on timing is set to 20*:
it appears his may be off more at low RPM, but does it matter?
Here is the automatic's MAF data. it does appear under WOT the the maf reading for actual will start to fall. is this ok?
Here is a screenshot of his measuing blocks i took:
Lastly, after he left my house i realized how to get the timing plug-in to VAG-COM to work . Here is what it shows on my vehicle. It says "Timing within spec, slightly advanced". is that good?
Thank you again. I've found this site invaluable. I come from the Duramax diesel family so i'm new to TDI's but not to diesels.
Last edited: