poor MPG STILL... after changing so many parts

[jedi-knight83]

Can i just say without it meaning to say bad, why buy a perfermance car and then chase mpg numbers? If thats what is really wanted go down the oil burner route and still get decent performance but a lot better mpg. Just my 2 pence worth.

Because i know what it COULD achieve. Its not like I've bought a lamborghini and I'm expecting it to get 50mpg...

This is a golf and it should be able to achieve 30 mpg.

Also its probably a sign of an underlying fault and I like to know that the car is working at its best.

[zerolag]

Can i just say without it meaning to say bad, why buy a perfermance car and then chase mpg numbers? If thats what is really wanted go down the oil burner route and still get decent performance but a lot better mpg. Just my 2 pence worth.

I hear that.  But it's nice to have a bit of both, isn't it - most peeps don't hoon it everywhere. 
My Stage 1+ can pull on a standard Focus ST, but still return 40MPG at 70MPH, something the Focus can't get anywhere near.

[geordie56]

I hear what youre saying and appreciate that but when you come on this forum and start doing a lot of engine tweaking and performance mods then this will take its toll. Im not saying everyone goes around thrashing it everywhere , all im meaning is when you start modding etc... then its because you want a fast car. I also know that a lot of maps out there wil achieve better performance but i bet my bottom dollar most peeps dont get maps for mpg. 

[jedi-knight83]

I hear what youre saying and appreciate that but when you come on this forum and start doing a lot of engine tweaking and performance mods then this will take its toll. Im not saying everyone goes around thrashing it everywhere , all im meaning is when you start modding etc... then its because you want a fast car. I also know that a lot of maps out there wil achieve better performance but i bet my bottom dollar most peeps dont get maps for mpg. 

Perhaps I should have made it clear that I believe its an underlying issue that is causing poor MPG and is something that has got worse.

If everything is working 100% and thats just the MPG I'm going to get then fair enough.. as you say I'd rather have the performance than great MPG.... but I believe I SHOULD have the performance and slightly better MPG than I'm currently getting so I'd like to find out what isn't working properly to cause my drop in MPG.

[GrayMK5GTI]

Can i just say without it meaning to say bad, why buy a perfermance car and then chase mpg numbers? If thats what is really wanted go down the oil burner route and still get decent performance but a lot better mpg. Just my 2 pence worth.

I've said this a million times on here. . .

The FSI technology in our engines is there to reduce fuel consumption, VW designed this car to be fuel efficient when driven gently, which is why most of us are driving a TFSI rather than a V6.  

Personally I like to potter about doing 40mpg on a run and when I'm in the mood for a blast, I don't give a rats b*****k how bad it is on fuel, but when just "driving" I want it to be as frugal as possible  

[driver rider]

LOL

When your ready let me know, I will book you in for eco driver training and pump your tyes up. 





I will fully check the car out for you smoke test it and try another maf,    I can also do you a lean burn cruise map at the exact rpm, load TPS where your cruise speed is and see if we can end up getting your 80mph cruise upto 40mpg..

Nick

Is that witchcraft nick?

If you can do that get his car doing 40mpg at 80 mph ill be mighty impressed.  I'll also be arranging a trip to you even sooner! 

I did a lean burn map on my old 1.8T which was just under 400bhp, and would do around 52mpg sitting at 75mph in 5th on the motorway.  I just found my cruise driving variables and then at them points in my map ran a lean spot and set map to run map pressure just over zero with strong timing in a window of 600rpm.  (not going to keep green EU nobs happy) 
   
Even just by having a full 1:1 linear throttle load map can return 3-4 mpg,  The Focus STs which I write maps for under HEX+ are seeing on average 50mile extra per tank just from a 1:1 throttle load map.

I never really looked in to eco stuff with Tfsi yet

 I've arranged one road trip this month getting bits for my car.  The next road trip will be up to yours to get my stage one sorted and judging by your expertise I'll be getting more mpg and mph!  whats not to like!   

[jedi-knight83]

Maf off again this morning on a 60 mile drive to London. -2 all the way. 22.5 mpg doing 80-90. I know I can't expect 30mpg at that speed but 22mpg seems low?

Maf on yesterday and maf off today on the same trip and maf off made no difference.

Not sure it's maf issue?


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[nezquick]

Can i just say without it meaning to say bad, why buy a perfermance car and then chase mpg numbers? If thats what is really wanted go down the oil burner route and still get decent performance but a lot better mpg. Just my 2 pence worth.

mainly because even on stage 2 you should still get respectble mpg figures. if his indicating low mpg even when driving eco theres something wrong

[Statller-Stevo]

Maf off again this morning on a 60 mile drive to London. -2 all the way. 22.5 mpg doing 80-90. I know I can't expect 30mpg at that speed but 22mpg seems low?

Maf on yesterday and maf off today on the same trip and maf off made no difference.

Not sure it's maf issue?


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I know your trying to eliminate things by doing it but you'll be running way rich with the maf plug pulled anyway
I've not read your full thread so forgive me if Im going over old ground here but did you check lambda at cruise not WOT ?
Just forget the flat out data logging for the minute (Id guess you'd be in open loop with Niks map @ wot anyway)
Plug the Maf in & check the cruise logs of actual & requested lambda you should be dam close to lambda 1 at cruise, if it is then all is good if not then you may need that map tweaking a bit
Did you swap out the B1 Oxy yet ?

Just to add I'm not talking fuel trims like you checked before I mean actual vs requested lambda not the trim
My car is very high power i see 27-30 round town and 35-38 @ 70mph

[Frenzy]

Maf off again this morning on a 60 mile drive to London. -2 all the way. 22.5 mpg doing 80-90. I know I can't expect 30mpg at that speed but 22mpg seems low?

Maf on yesterday and maf off today on the same trip and maf off made no difference.

Not sure it's maf issue?


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Did a run from Birmingham to London couple of Saturday's ago. Set off at 20.30, got back home by just after 22.00. Did mostly 80-90mph in temps of 5.5 C until i got to London when it rose to about 9-10 C. Ave MPG was about 27.5 MPG. Only blasted it a few times so maybe ate 1MPG off the average that i could have got but to leave behind the oil burning Mk6 golf was too great a temptation, and i also like to fly up the long hill as you leave oxford 

I'm definitely noticing a hammering on MPG since the cold weather kicked in. During the summer if i did the same run i'm wholly confident i could get 30MPG, 31 poss. If i stuck to cruising at 70mph then i'd see anywhere between 34-37MPG dependent upon how good a start i got going from doorstep to motorway.