Today I.....

gangitano85

Member
Today I finally satisfied myself that there isn’t anything wrong with Audrey’s fuel consumption.

I borrowed the car to run up to Exeter and back, a distance of 28 miles each way according to Google and a very hilly route. I kept the average speed to 65mph indicated but allowed it to decline and rise by 5mph each way on the hills, including some out-of-gear coasting on the steepest downhill gradients. Acceleration when applied was brisk but not excessive.The tyre pressures are at the full load settings as per the filler flap. The climate control unit was switched off (ie not even blowing - switched off using the button)

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This seems to be normal for a TDi90 / ATL in winter, although I must admit I was hoping for a little more considering the six speed gearbox that’s fitted, giving a true 70mph at 2000 rpm in top - I suppose the benefit of this mod is therefore solely in decreased engine noise and wear rather than any fuel consumption improvement. I found at 65mph the DIS read 55mpg or so on the flat. Maybe it will nudge up a few mpg in warmer weather.
I just refilled my 90 ATL. 34.5 liters for 417.00 miles at an average speed of 43mph, so roughly 55mpg. Mind you, my DIS claims I have only averaged 51.5mpg, so keep that in mind for your figures as well. Tends to overestimate the fuel consumption.
 

dj_efk

A2OC Donor
I just refilled my 90 ATL. 34.5 liters for 417.00 miles at an average speed of 43mph, so roughly 55mpg. Mind you, my DIS claims I have only averaged 51.5mpg, so keep that in mind for your figures as well. Tends to overestimate the fuel consumption.
Oh interesting. Once I get the car back into my household full-time and can monitor tank-to-tank mileage from one tank to the next then I can check that out. It’d be good to see high 50’s in true tank MPG then if DIS is pessimistic, especially when the weather is a little warmer.
 
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A2Steve

A2OC Donor
Well yesterday actually... I took a slight detour for work and headed up to see @A2Steve to pick up my leather seats. Not only did I get to meet the lovely man himself but my car ticked over to all the sevens just as I arrived! Plus Patty held up to the trip very well, longest drive for a while
Lovely to meet you Tim. In better times we could have had a good chat, hopefully at the next social.
 

dj_efk

A2OC Donor
Nice shot there! I must admit you've got a little too much rim vs. sidewall there for my taste but I do love those wheels nonetheless! Are they 18s?
 

AndyP

Member
I just refilled my 90 ATL. 34.5 liters for 417.00 miles at an average speed of 43mph, so roughly 55mpg. Mind you, my DIS claims I have only averaged 51.5mpg, so keep that in mind for your figures as well. Tends to overestimate the fuel consumption.
Non-standard tyre sizes will modify these figures. In fact the "standard" tyres which cause the speedo to under-read effectively make fuel consumption look better than it actually is. If you replace the tyres with a slightly higher profile causing the speedo to report more accurately then fuel consumption appears to dip. Even the change in tyre sizes as the tread wears down will make a small difference. Ultimately, only proper tank to tank measurements over accurate distances will give the most accurate results.
 

Proghound

Admin Team
Non-standard tyre sizes will modify these figures. In fact the "standard" tyres which cause the speedo to under-read effectively make fuel consumption look better than it actually is. If you replace the tyres with a slightly higher profile causing the speedo to report more accurately then fuel consumption appears to dip. Even the change in tyre sizes as the tread wears down will make a small difference. Ultimately, only proper tank to tank measurements over accurate distances will give the most accurate results.
Other way round. Smaller tyres make the speedo and mileometer over-read, thus inflating your MPG.
I understand the standard speedo error is about 3% so the first sidewall oversize above OEM reference i.e. 185/55x16 or 175/65x15 will overcome it.
 

AndyP

Member
Other way round. Smaller tyres make the speedo and mileometer over-read, thus inflating your MPG.
I understand the standard speedo error is about 3% so the first sidewall oversize above OEM reference i.e. 185/55x16 or 175/65x15 will overcome it.
Sorry, of course you're right, I should have re-read that before I posted it.
 

Jmywil

Member
...swapped out the old ECU for the ProBoost courtesy of A2Steve. EML had been on since I got the car last year (NOX sensor issue), now goes out, result! Took it for a drive, didn’t notice much difference, maybe a little more responsive at mid and high revs, maybe a little less at low revs. Only downside is the cradle that holds the ECU, unique to the FSI, was broken, someone clumsy been in there before so I need to get a replacement.
 

Attachments

2work

A2OC Donor
Stripping heated seats down for @MikeMiles ;)
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Morning Ross,

If you have time sir could you please do some sort of write up with pictures on the Seat cover removal. This is something I’m needing to do myself to see if I can repair my factory heat pad. I really don’t want to destroy my Twist leather seat cover in the process.

Still waiting out to see if you’ve got a spare heated seat cover when you get to your retrofit.

Kind regards,

Tom
 

rosscanning

A2OC Donor
Morning Ross,

If you have time sir could you please do some sort of write up with pictures on the Seat cover removal. This is something I’m needing to do myself to see if I can repair my factory heat pad. I really don’t want to destroy my Twist leather seat cover in the process.

Still waiting out to see if you’ve got a spare heated seat cover when you get to your retrofit.

Kind regards,

Tom
Hi Tom,

I have taken a couple of pictures which i hope will help you out ill send them in a message 👍, there’s nothing really in to removing the foam from plastic base and to backs start with rear net and slowly work your way round. But becomes more tricky as you need to be careful with removing metal rings from metal strips which are embedded into foam.
Again all straight forward with what you need to do once you start stripping down, all can say is you need alot of time especially if yours is leather.

I’ll keep you informed with my other spare heated seats i have.
Cheers
Ross
 

Howey

Member
Hi Tom,

I have taken a couple of pictures which i hope will help you out ill send them in a message 👍, there’s nothing really in to removing the foam from plastic base and to backs start with rear net and slowly work your way round. But becomes more tricky as you need to be careful with removing metal rings from metal strips which are embedded into foam.
Again all straight forward with what you need to do once you start stripping down, all can say is you need alot of time especially if yours is leather.

I’ll keep you informed with my other spare heated seats i have.
Cheers
Ross
Have you got new hog ring and hog ring pliers?
 

2work

A2OC Donor
Hi Tom,

I have taken a couple of pictures which i hope will help you out ill send them in a message 👍, there’s nothing really in to removing the foam from plastic base and to backs start with rear net and slowly work your way round. But becomes more tricky as you need to be careful with removing metal rings from metal strips which are embedded into foam.
Again all straight forward with what you need to do once you start stripping down, all can say is you need alot of time especially if yours is leather.

I’ll keep you informed with my other spare heated seats i have.
Cheers
Ross
Thank you very much Ross.

Kind regards,

Tom
 
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