Octavia Economy Challenge

[Mysticality]

So, today I realised that during the past week I've posted the best economy figures I've ever seen.

I hereby challenge the rest of VWWC Skoda (Or the entirety of VWWC) to best my numbers!! (photographic proof required, please )

[zach]

i regularly get 5.5 to 6 in my 1.8TSI on hwy drives though never been on a long cruise to test kms on a full tank

[kamold]

No photographic proof, but I've done 4.7 for a ~100km trip. Was all at ~80km/h which seems most efficient as faster than that introduces too much drag and revs go up too much to be really riding the torque wave properly.

Drive from Sydney to Melbourne when I first bought the car however was 5.7L/100 sitting slightly under the limit as I wasn't wearing plates.

[Mysticality]

Aye, but overall for a tank? :p

[kamold]

Melbourne to Sydney is a tank.

[Mysticality]

Did you have to fill up along the way? O.o

[brad]

Nope, not playing.

My economy has been (relatively) crap for the last mumblemumble months while the N75 valve wasn't working - I was up around 6.8 instead of 6.5. The deterioration was particularly noticeable in suburban running or when doing >100kmh. Greater than 100kmh was up around 7.5l/100 on the flat. Suburban had me going from an average 6.2l/100 back up to 7.0L/100 in the 5km/15m trip from the end of the motorway to home. All of this is with a Bluefin remap BTW

Replacing the N75 had no effect on the >100kmh consumption but fixed the suburban running (went from 6.2L to 6.5L in the 5km/15m trip home).

So on Wednesday I put the map back to stock - resulting in worse highway economy & worse suburban economy. YAY!

Need to put the thinking cap on & work out what is wrong. I'm wondering if it's carbon buildup on the inlet valves.

Does anyone know how to reset all the ECU parameters back to the baseline using VCDS?

[woofy]

I was reading about the carbon buildup recently, I used to get it with our Mazdas but only just noticed some dealers doing it, but noticably not mine...as yet.

[brad]

I no longer have access to a borescope (camera on a flexible wand device), therefore, I'm not sure if there's carbon or not.

If I could work out where a vacuum line was on the inlet then I'd pump it full of Subaru Upper Engine Cleaner or similar (Nulon foaming intake cleaner, etc).

meh, my own fault for leaving the n75 for so long. thought all these minor problems were due to that.

[zach]

what are the symptons of n75 issue.

[brad]

Multiple (50 + over several months) n245 (? some number like that - part of the boost control plumbing) faults when scanned.
A bit of a flat spot from ~2500rpm to ~3000rpm
Slight increase in fuel consumption around the suburbs or at >100kmh.

No show stoppers & I drove it around for mumblemumble months before i had replaced (cow of a job it is too).

[Ocy_RS_TDi_Kombi]

The best I've got from my RS TDi was 5.4l/100km driving from Mildura to Melbourne (@ 540km trip with last bit across inner Melbourne to get from the Calder to Nunawading). That was with just myself in the car and an average speed of 98km/h. Most of the trip is flat with speeds limits 100km/h to 110km/h and I normally do @ 8km/h over the limit. Around Kyneton/Mt Macedon it does get a little hilly though.

My Ocy has now done Melbourne to Mildura & back 13 times now. I find when you have all the family plus their gear it goes up. Also with the Bluefin tune the best I've got is 5.9l/100km even though your not using the xtra power sitting at 110km/h (admittedly with all the trips I've done with the Bluefin, I've also had the family with me). On average without the Bluefin I get @ 5.7l/100km, with it @ 6l/100km.

Have also found when doing under 100km/h and cruising, the average is under 5l/100km.

[Mysticality]

How much of a benefit is the bluefin?

[BeigeJet]

I hereby challenge the rest of VWWC Skoda (Or the entirety of VWWC) to best my numbers!! (photographic proof required, please )

Well I wish I had taken a photo! 1122km on 53 L from Port Pirie back to Melbourne via the Riverland, Mildura and Swan Hill!

It was part of a 11,000k road trip over 5 weeks May June last year.

We averaged 5.18L per 100k over the entire distance. All based on the fuel filled.

I find that my trip computer on the Jetta can be out (read optimistic) by anything up to 0.6 L per 100k. Around Melbourne even though the memory 2 may indicate 5.5 - 5.7 in reality I'm getting 6.1 - 6.3

[Ocy_RS_TDi_Kombi]

How much of a benefit is the bluefin?

It's a mild tune but worth it in my eyes. It gives approx 10% to 15% more power & torque. There is less of a flat spot below 1,800rpm but when the turbo does kick in its lots stronger especially from 2,000rpm to 3,000rpm. It also revs to 5,000rpm rather than 4,500rpm however its still a little breathless up high and when it changes up into the next gear the power/torque surges again.

Cost is roughly $700 and when you go in for a service you can put the standard tune back on and back to Bluefin afterwards - takes approx 5 minutes and the dealer doesn't know you had a tune on the car. Check it out on www.superchips.co.uk.

I know some people on this forum are against tunes (warranty and insurance issues) and far enough, but I think it's worth the $700 investment.