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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old March 24th, 2013, 04:01   #1
biged681985
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Default 05 passat fuel economy questions

i just purchased an 05 passat with 191k on it all stock. i have a back ground of working for several diesel shops working on diesel pickups but im a rookie at the vw diesels. im wanting to get the best economy i cant. so far i have two fill ups of 37 mpg. not bad compaired to what im used to driving. but im sure i can do several things to help fuel milage. i plan on cutting the cat and muffler out of it and putting a twister muffler on it to keep it from droning. i was also thinking of deleting the egr and cooler. i know it helps in the bigger motors but not sure if it does in these little tdi motors and if it requires a programmer to do it. any help would be greatly appreciated.
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Old March 24th, 2013, 04:21   #2
thundershorts
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I don't think you will improve much on your mpg. Cat delete sure won't help you at all, nor the egr. you may be best off with new air and fuel filters, using the best oil, and doing a trans service, and possibly some sort of tire upgrade. Some say the bs delete will add a mpg or two. In any event, if you've followed this forum, its imperative to address the bs issue before your mpg is reduced to zero.
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Old March 24th, 2013, 04:55   #3
biged681985
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ive not followed this forum for long. i signed up three weeks ago and was not approved because i put looking for my vehicle. so i re signed up this past week after i had bought my car.

that being said, i have no clue what your talking about with the bs issue.
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Old March 24th, 2013, 05:37   #4
crankme69
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Warning anything related to emissions is off limits here...don't ask.

Everything you mentioned I did to my older Passat but my vehicle and your 2005 are 2 totally different vehicles.
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Old March 24th, 2013, 09:31   #5
Uberhare
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Remove the auto tranny for a manual. I've gained 6mpg.
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Old March 24th, 2013, 12:19   #6
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bs= balance shaft module. you will find a good start on reading the sticky by that title at top of the b5 page.
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Old March 24th, 2013, 21:32   #7
biged681985
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Quote:
Originally Posted by Uberhare View Post
Remove the auto tranny for a manual. I've gained 6mpg.
that is something i will be doing in the future. but cant afford to right now.
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Old March 25th, 2013, 03:31   #8
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The bs chain on yours can take out the engine with no warning, and the delete parts are not expensive. quite a few owners put off fixing it and found it caused extensive damage when it failed.
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Old March 25th, 2013, 18:44   #9
outthere
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I've found the mileage doesnt vary materially no matter what. +/- 2 or 3 mpg doesnt make a difference when you calc the gas savings vs. the time and $$ the mods require. the good news is 65 or 80 mph doesnt matter much either. Just drive and enjoy. I've had the car since new, 9 years of driving.

You will chew up CV boots - start saving your pennies and/or Saturday afternoons for fixing those.
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Old March 25th, 2013, 19:21   #10
peiphil
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What does a CV boot taste like? LOL
These cars dont get the milage like a jetta does.
But its worth it.
And get rid of the BSM chain and get the gear driven BSM for $1360 and some wrench pulling.
Not that bad of a job

Last edited by peiphil; March 25th, 2013 at 19:29.
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Old March 25th, 2013, 20:22   #11
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Besides being against the rules, deleting the EGR can make MPG worse depending on how and when the car is driven. The cat and muffler are also oversized enough that removal gains you no power or MPG on stock to moderately modified engine. Only gains would be when the cat has become plugged.

37 is not too bad on this generation Passat. I second the recommendation to inspect for and replace the balance shaft/oil pump drive chain, if it is still there. The updated BSM is a gear drive unit. I don't know if the BSM delete drives the oil pump with chain or gear.

Raxles axles makes good replacement cv half shafts at a good price and life time guaranty, last I checked. I think they enlarged the boots so the don't rub the cv ball cages. That was the excuse I got as to why the Passat cv boots fail so regularly.

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Old March 26th, 2013, 02:41   #12
newlitemotorist
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Quote:
Originally Posted by Uberhare View Post
Remove the auto tranny for a manual. I've gained 6mpg.
After all of my reading I think this is the only way to really gain anything on these cars. I have owned my passat wagon for almost a month and it consistantly gets 29 in the city and around 42 on the highway. City driving is what kills the mpgs on my car at least. If I watch the mpg gauge, I have noticed that the first 3 gears just suck the fuel. Once it shifts into fourth my mpgs jump substantially. I have read that this has to do with the torque converter. I guess once in 4th the tc locks up.

The only other thing I have seen that actually provides a return is to run light weight wheels/tires that are tall and skinny. Also, stay away from the aggressive tread tires and you might even check out the low friction Michelin's.
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Old March 26th, 2013, 07:04   #13
50harleyrider
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I'm always at 30ish in town and 40ish higway. That's about the best you'll get without converting to manual (which is on my list). These aren't light cars so don't expect much in town. You're not ever gonna see 49mpg highway like a B4. Also you'll most likely never see as low as 35 highway like a 2005 MB diesel either. It's all about weight...

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Old March 26th, 2013, 18:48   #14
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I was consistently getting about 33mpg before the swap, now I get 37-40 depending on outside temperature.

It seems the car burns a lot of fuel to heat up. If the car is pre warmed, even half way to operating temp - I can get well over 40mpg. When the outside temp drops below -10 Celsius, even after being warmed up - mileage drops 3-4 mpg.
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Old March 26th, 2013, 21:49   #15
biged681985
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Quote:
Originally Posted by peiphil View Post
What does a CV boot taste like? LOL
These cars dont get the milage like a jetta does.
But its worth it.
And get rid of the BSM chain and get the gear driven BSM for $1360 and some wrench pulling.
Not that bad of a job
Where are you finding it for $1360?
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