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Old 07-15-2017, 05:04 PM   #1 (permalink)
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Hypermiling with VW 6 spd Automatic

Greeting folks,
I have a couple of questions. Due to my selling my 2011 VW Jetta sportwagen TDI back to VW due to it having the TDI diesel engine I am again looking to purchase a car that will get similar fuel mileage. I have for a number of years been coasting all over the country due to my jetta having a 6 spd manual transmission. Several of the VW's I am looking at have the 6 spd automatic transmissions. My question is can I operate this VW automatic in the same manner I did with the manual ? ? ? Will I be able to go to neutral going down the hill and then drop back in to drive as my speed drops ? I'm trying to find a replacement with the manual but they are a bit scarce. I want to do what ever I can to try to keep getting my 50 to 54 mpg over the road. Thanks in advance for answering my questions.
Have fun,
buckshot. P.S. I am back to work on my Nissan diesel powered Sonoma.
Looking forward to getting 38 mpg with the Sonoma.

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Old 07-15-2017, 07:53 PM   #2 (permalink)
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If you shift your Auto manually then sure.

I have an Auto Torque Convertor. I've seen where others have modified the controllers to suite hypermiling by adding a sort of manual override.

However, with VW, they're already pretty good. I'm sure you'll find that yours cuts off fuel to the Injectors when it coasts.

That's not as good as going into N and turning off and automatically turning back on when you want to go back up the other side.

Being a computer-programmer, I was looking into solving this with GPS code. But haven't found enough 'friends' to make it worthwhile.
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Old 07-15-2017, 08:08 PM   #3 (permalink)
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Quote:
Originally Posted by ibbuckshot View Post
I am back to work on my Nissan diesel powered Sonoma.
Looking forward to getting 38 mpg with the Sonoma.
That sounds interesting. But anyway, would a new Cruze be totally out of question? IIRC it's the only new Diesel car available with a manual transmission there.
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Old 07-16-2017, 09:27 AM   #4 (permalink)
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If you try the automatic, shift to neutral at speed with engine on and see if rpms drop to idle or close, if they don't drop, you won't achieve good numbers that you are hoping for.

My Focus drops to idle, but my wife's Mariner doesn't, it holds the rpms.
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Old 07-16-2017, 02:35 PM   #5 (permalink)
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Old 07-17-2017, 11:41 PM   #6 (permalink)
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probably not a good idea with the 09g

some of the newer VW DSG transaxles are designed to
"freewheel" or coast
downhill
more in the systems designed for fuel economy

the 09g 6 speed automatic is not

and
the DSG is really a computer controlled (and shifted) manual transmission
no torque converter or LOSSES from a torque converter
so IF you are going or thinking to stick with VW ( a choice which i agree with)
try to find a manual trans or DSG and avoid the automatic altogether

i find i can hold most of the 1.8s or the 1.4 near 50mpg while at cruise around 55 to 60mph with DSG or manual trans as per the mfi display

an UNmentioned choice C is purchase and older TDi with the BEW or BRM pd engine i would never consider a diesel cruze they are junk in my very biased but knowledgeable opinion

having said this
be aware that i am a certified VW tech and have been for many moons

i drive a TDi golf with BEW pd engine , manual trans AND a V6 ATQ passat auto trans

Last edited by mwebb; 07-17-2017 at 11:48 PM.. Reason: mfi
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Old 07-20-2017, 12:36 PM   #7 (permalink)
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Quote:
Originally Posted by mwebb View Post
some of the newer VW DSG transaxles are designed to
"freewheel" or coast
downhill
more in the systems designed for fuel economy
What do you mean by freewheel? Neutral-coasting?


Quote:
the DSG is really a computer controlled (and shifted) manual transmission
no torque converter or LOSSES from a torque converter
so IF you are going or thinking to stick with VW ( a choice which i agree with)
try to find a manual trans or DSG and avoid the automatic altogether
I honestly don't know how any of those dual-clutch automated-manual transmission fares on hypermiling, but I have seen some complaints about a low reliability of the DSG under certain harsher conditions.
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Old 07-20-2017, 11:59 PM   #8 (permalink)
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Quote:
Originally Posted by cRiPpLe_rOoStEr View Post
What do you mean by freewheel? Neutral-coasting?

yes , system goes to nuetral rolling downhill as allowed by the engineering involved and dependent on conditions at the time


I honestly don't know how any of those dual-clutch automated-manual transmission fares on hypermiling, but I have seen some complaints about a low reliability of the DSG under certain harsher conditions.
early DSG systems had issues with dual mass flywheels .... mostly resolved .... and we did quite a few mechatronix units under recall
warranty ALSO that issue has been resolved
so
to me it seems (since i am hybrid certified)
the VW jetta hybrids have more DSG issues than regular non hybrid VWs HOWEVER most of those are displayed and resolved at low mileage under warranty and the rest of the VW line up does not have DSG failure issues
of any kind
when
not
abused ... even when they are abused failure rates are very low ... we have not done any yet this year to date .

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Old 07-22-2017, 01:29 PM   #9 (permalink)
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My wife has a DSG 6sd golf. Around town it does fairly well at dropping to idle and coasting off throttle. On the highway I find it better to manually shift to 6th and leave it there because in auto it down shifts to 5th with too little pressure on the accelerator. With that said the best I've managed is about 34 mpg on longer trips. My wife gets about 24 in town.
The computer does try to shut off the injectors when coasting but that causes a noticeable deceleration. Shifting to neutral is NOT recommended because of cooling and lubrication issues. Stick to true manuals if you want to neutral coast.
FYI my biggest complaint with the VW DSG, is the shifter is setup backwards. ie, bump the lever forward to increase gear, and back to decrease.
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Old 07-25-2017, 09:05 AM   #10 (permalink)
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The VW is unsafe to coast in neutral with the engine ON? Why not? I see you say cooling and lube issues but the engine is still turning, the pumps are still running. Do they not keep up with cruising speed loads when the engine is at low revs?

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