Hi All

 

Apologies, as I know there are a few MPG threads, but I have a specific query.

 

I have recently bought a Petrol VRS DSG car from a BMW dealer who took it as a trade in.  I am absolutely loving the car, and it does mostly twisty A (60%) and B (30%) road miles, with a little (10%) city driving.  Almost no motorway miles.

 

When I bought the car, the BMW dealer had little or no knowledge of what the car was, and to be honest, neither did I - when it arrived I discovered lots of aftermarket work - bodycoloured grill surround, bulb upgrades, and most pleasingly paperwork showing a stage 1 remap, then stage 2 with sports downpipes and engine mount mods.  As a consequence, the car is bloody quick, and showed 280bhp on the rolling road (from the paperwork printout)

 

However - the best I can get as an overall MPG figure with the kind of driving above is 25-27mpg - even resetting it on one motorway run and cruising with a gentle foot (but at 80mph) is 32mpg.  I am not racing the hell out of it, but not driving like Miss Daisy is in the back seat either.  It doesn't seem to make much difference whether I drive in D or manual/paddle (which I do quite a lot).  I use Sport hardly at all as that only sends your driving one way  

 

Is it the DSG producing the low figures, or the remap - I managed to speak to the previous owner about the work, and he suggested that the remap didn't make lots of difference unless hammering the loud pedal, saying it only dropped one or two mpg in normal driving.

 

I love the speed it does, but its probably unnecessary, and if it means 5 or 6 mpg I'd be tempted to revert it to standard mapping - what are other non modified DSG VRS petrol drivers getting as a comparison.  I know economy isn't what these cars are about, but I suspect the standard performance would be plenty.

 

Thanks all - love the forum, one of the best car communities I have come across, thanks for all the info!

 

Matt

I see between 34 to 38 mpg on a mix of A and B roads to work but it does drop a bit in the winter mines a estate dsg petrol.

blimey, that's a big difference...

mines on the Tsi Engine, 2010 FL - not sure if that would be expected to make a difference either way...

Due to the remapping your fuel computer may need re-calibrating. Of course depending on the quality of the map the car could be overfueling a bit causing the v poor mpg.

That said I was loaned a Mk5 GTI by Enterprise rent a car back in 2005, got alot of hire cars at the time through my company and got to know the local crew to the point they'd give me some nice motors.

I was told that the car had a remap, didnt believe it though as it wasnt 240-250hp quick but even still during the time I had it it rarely bettered mid 20's but i did rag it. TFSi's are quite well known for being a bit juicy unless driven quite gently, TSis are better but mid to late 30's is still good going for them with some spirited driving.

Had a 2011 Fabia vRS estate prior to my current diesel Octy vRS Blackline, was supposed to be able to return 45mpg and didnt generally better 32mpg average for the time I had it (18 months 11k miles).

Edited 17 July, 201312 yr by pipsyp

and I guess if it would only add a couple of MPG then I would just suck it up and enjoy the uprated power.  The work was by superchips ltd in buckingham and states bluefin  stage 1 then stage 2 maps with the downpipes etc (I think back of exhaust is standard?)- means nothing to me, but others may know better...

How many miles has it done now? I was having poor MPG performance with my TFSI and hesitation (this is on a car with the standard 6 speed manual not DSG). I was getting poor MPG (mid-low 20's around town) and the same as you a maximum of 32mpg on a run. I also was running a Stage 1 Jabbasport Map and had it reverted back to standard and the MPG got worse - so it wasn't that.

 

After lots of other investigation I found that the inlet valves were clogged with carbon deposits. I have had them cleaned out and on a trip to Legoland last week (250 miles), 5 up (and not light people either!) it averaged 36mpg on a steady 75-80mph motorway run. Round town MPG is now around the 30mpg mark if it has a chance to warm up!

 

Carbon deposits on the intake valves have been known to cause issues as at low at 30k miles but are more usually seen at around the 80-100k marker..

Edited 17 July, 201312 yr by R8MXX

That's an interesting one - mine has done 42K.  What was required to clean them?

 

Cheers

 

Matt

Best off reading my thread on it Matt - have gone through step by step what I did to try and resolve the issues.

It could be if yours has been run on cheap fuel before you had it (i.e. non super unleaded) it could happen earlier - people in America with the same engines in the Golf GTi have been reporting it around your mileage and even less!

http://www.briskoda.net/forums/topic/273037-vrs-20t-fsi-stuttering-at-idle-and-on-acceleration-up-to-2000-rpm

 

Thanks for this mate, I'll have a good look at the thread

One of the reasons why I swapped my TSI DSG for a diesel version, I loved the TSI with teh DSG but I just couldnt live with the constant visits to the pump, awesome car, good turn of speed.

what were you getting out of yours, James?

The terraclean process is supposed to chemically decoke your engine, decrease emissioms and increase mpg if you think excess carbon deposits are the cause of your problems, though I guess if your producing 280bhp there's a pay off involved economy wise compared to a stock spec'd car

Terraclean won't touch the inlet side of things due to the fact that the fuel on tfsi engines is directly injected into the combustion chamber.

Sent from my GT-I9300 using Tapatalk 2

Maybe the spark plugs need changing?

could the spark plugs affect this?  My mechanical knowledge stretches to assessing a car with a kick of the tyres.