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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old May 30th, 2017, 16:48   #31
adjat84th
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Quote:
Originally Posted by 2015vwgolfdiesel View Post
Cost? Other info to help this really uninformed guy. Would be nice to have it "spot" on.

Thx
I ran my first ten tanks and compared the actual vs MFD to come up with ~8% difference. The value you adjust in VCDS changes from 100% to 108% (or whatever your calculated difference is). Mine is now consistently within +/- 1mpg every time.
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Old May 30th, 2017, 16:54   #32
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Can you do this with your speedometer as well?


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Old May 31st, 2017, 06:39   #33
2015vwgolfdiesel
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Originally Posted by Blue_Hen_TDI View Post
Probably not worth buying (it's $200) if all you want to do are a few tweaks. Just find a local with a VCDS cable and beg and borrow.

http://www.ross-tech.com
Ya

I'm to cheap to pay $200.

But in my dreams

Thanks, again
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Old May 31st, 2017, 06:46   #34
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Actually VCDS is nearer to $300 now....
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Old May 31st, 2017, 07:07   #35
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Actually VCDS is nearer to $300 now....
And VIN-limited too, which really blows. Glad I still have my unlimited cable.
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Old May 31st, 2017, 21:57   #36
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So, is it fair to say upper 30's mpg for largely city driving.....and possibly way over 50 if mostly highway? I'm ready to purchase a 2015 Passat and wanted to just confirm....
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Old May 31st, 2017, 23:20   #37
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So, is it fair to say upper 30's mpg for largely city driving.....and possibly way over 50 if mostly highway? I'm ready to purchase a 2015 Passat and wanted to just confirm....

Everybody's driving is different. Expect a tad better than the 2010 in your sig. My "fixed" 2015 does 10% better than my stock 2010 both are 6m. A 2015 DSG may be a little more than 10 percent better than 2010 DSG on the highway because of the taller final gear in the 2015.
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Old June 3rd, 2017, 20:06   #38
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Default Idle RPM

I have a DSG auto transmission. I have noticed it idles at 1000 rpm. If i let my foot off the brake at a stop, the car will move forward. Is this normal? I am thinking I will burn out the clutch like this.
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Old June 3rd, 2017, 20:09   #39
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How do you switch between MFD 1 and 2?
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Old June 3rd, 2017, 20:14   #40
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Originally Posted by moorsb View Post
I have a DSG auto transmission. I have noticed it idles at 1000 rpm. If i let my foot off the brake at a stop, the car will move forward. Is this normal? I am thinking I will burn out the clutch like this.
Yes, that's normal. You're still in drive. You can put it in neutral if you want. Avoiding inching up while stopped is a good practice.

I saw a YouTube video where they monitored clutch pressures in the DSG with the VCDS program at a stop. The car still held a small amount of clutch pressure when stopped in Drive. When shifted to Neutral, the pressure is released to zero. I'm almost certain that the minimal pressure on the clutch(es) while stopped is not going to cause any significant long-term premature wear. I'm assuming the German engineers have worked out a margin of safety.
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Old June 3rd, 2017, 20:18   #41
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Originally Posted by moorsb View Post
I have a DSG auto transmission. I have noticed it idles at 1000 rpm. If i let my foot off the brake at a stop, the car will move forward. Is this normal? I am thinking I will burn out the clutch like this.



Mine idles at 800 RPM

But when it DOES hit 1,000 MINE is in a re-gen

Hope this helps
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Do the fix, pocket $8,000-ish 6, 776 miles on the clock, Pristine condition
BB = $25,625, but VW is not paying for PRIME condition nor ULTRA low miles.
Net bases in my 2015 Golf = $12,495
NADA-KBB for older CPO Golf TDi 2014 = $18,250
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Old June 3rd, 2017, 20:33   #42
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While we're on regens, I monitor mine with Scangauge II. So far, it's looking like they are occurring about every 250 miles in mostly highway driving and last about 10 minutes. EGR and DPF temps peg at 1200F during that time.
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Old June 5th, 2017, 20:15   #43
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Default DEF consumption

I have read some speculation that the "fix" to the ea288 will increase def consumption. Just curious as I have just put a deposit down on a leftover myself. It will be my first experience with def. can anyone speak to the change in consumption rate of the def?
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Old June 5th, 2017, 20:24   #44
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I have read some speculation that the "fix" to the ea288 will increase def consumption. Just curious as I have just put a deposit down on a leftover myself. It will be my first experience with def. can anyone speak to the change in consumption rate of the def?
I am approaching 40K miles service I do not have a Ad blue warning yet! Before this I always get a warning before the service....so mine is actually better!
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Last edited by tomo366; June 5th, 2017 at 20:36.
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Old June 5th, 2017, 20:24   #45
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Just filled my third tank this evening. 55.2 mpg.
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