Official Fuel Economy Thread (formerly Highway economy).

[jcubed]

Hi Sharkie.

I agree 100%. In all but the roughest conditions....

Now that I have fully co-operated with you, you may just concur that perhaps the word "all" is pushing it a wee bit ?

JJJ

[jimbomort]

An APR TSI Tiguan makes 189kw and 402NM of torque ..... more than 350NM of that is available from 1750rmin to 5000rmin ... imagine how that would go towing anything .... and at highveld altitude loses only 9% of power ....

Sharkie, I'm all the way with you of course on the APR'd TSI, and only a minor point, but where do you get 350Nm from 1750? From a curve for your car from Dyno testing? The APR stage 1 torque curve doesn't go below 2000rpm, I estimated from the APR graph that it would still be around 340nm (close) @ 2000rpm provided curve slope didn't change much, but all the way to 1750 would seem to be pushing it.

Interested in your source, happy to be proved wrong

Else gather on the differences in power losses above, that you are saying the forced induction copes better at higher altitudes than a normally aspirated car?

[jcubed]

Hi jimbomort,

Yes, power is lost as altitude increases due to the ambient air pressure dropping.

Standard atmospheric pressure at sea level is 1013.2mbar at 16°C. The rule of thumb is that you loose 30mb/1000ft. Therefore, at 6000 ft ASL - the highveld levels sharkie (who sounds like a home-boy) refers to - the ambient air pressure would be less by 180mbar.

That as a percentage of the ISO pressure above, would be 18%, so your power loss would be the same.

The first 180mbar of boost from a turbo puts this power loss back, and the car performs as at sea level, except for the initial turbo lag. The rest of the boost, say to 0.6 bar or so, adds performance. This is what is usually adjusted - the max boost level - when tuning, so that the pressure goes to ambient plus, say 0.8 or even 1 bar.

[Sharkie]

Hi jimbomort,

Yes, power is lost as altitude increases due to the ambient air pressure dropping.

Standard atmospheric pressure at sea level is 1013.2mbar at 16°C. The rule of thumb is that you loose 30mb/1000ft. Therefore, at 6000 ft ASL - the highveld levels sharkie (who sounds like a home-boy) refers to - the ambient air pressure would be less by 180mbar.

That as a percentage of the ISO pressure above, would be 18%, so your power loss would be the same.

The first 180mbar of boost from a turbo puts this power loss back, and the car performs as at sea level, except for the initial turbo lag. The rest of the boost, say to 0.6 bar or so, adds performance. This is what is usually adjusted - the max boost level - when tuning, so that the pressure goes to ambient plus, say 0.8 or even 1 bar.

Durban born, spent 10+years in Jhb ..... those years taught me the differences between sea-level & Jhb altitudes as far as power goes .... .... eventually gave up chasing normally aspirated power in Jhb and went forced induction and thanks to the current technology around all over never had to go back .... .... turbos are amazing things ....

BTW, have a look at my signature link, its got lots of GP number plated cars in it ...

[TiguanJo]

I have done just under 70,000 kms and the overall average is 5.9l/100 Last weekend I managed to do a trip from Rutherglen to Wagga at 4.8l/100. Simply amazing. I keep the car varying with the necessary boosts etc and definitely no 'lugging' I have the 2ltr TDI. I love it very impressed.

[team_v]

Done 1700km so far and the MFD reads 7.8l/100km
That is with an APR assisted TSI.

[yshsieh]

Run 6000km APR tuned TSI, 8 l/100km --> highway speed 100km/h

[Tedhaggie]

24000km . overall 7.6l/100km best 6.3l/100k

[ChrisJ]

24000km . overall 7.6l/100km best 6.3l/100k

wow jealous of all you guys, I only manage around 9s in my tdi. mostly inner city driving though. drops massively when just going to suburbs and highway.

[Transporter]

Ok, first fill up, MF display says 7.6L/100km and calculated from docket it is 7.79L/100km. Very happy with that since 50% of that were 20km trips in "S" mode up the hills to help engine run in.