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| Author | Subject: Poor Mpg/ Changing the Lambda |
 superchargedblack1997gti6
Seasoned Pro  Location: guildford Registered: 15 Aug 2009 Posts: 2,376 Status: Offline |
Post #26
Thats what I've noticed to be fair if i drive enthusiastically or not i still get poor Mpg. But good luck doon!living for the 306 ________________________________________ Super high boost Completed, destroyer of gearboxes and 160mph club |
 Posted 13th Sep 2013 at 09:37
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eliotrw
Seasoned Pro  Location: Southwark Registered: 18 Jul 2010 Posts: 4,864 Status: Offline |
Post #27
Yeah that's it for me two.Every tank I get 340-360 Whether I drive like grandma for aryton senna ________________________________________ Ex- Phase 3 China GTi-6 T-Reg |
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Posted 13th Sep 2013 at 10:06
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doon1988
Regular  Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #28
My low speed fans have packed in and I think I have a dodgy Idle Control Valve so that could potentially be impacting mine.. Getting it sorted shortly though so hopefully if that is part of the issue it will be resolved soon....But for as long as I can remember Ive only ever had about 200/250 out of a tank. until this week by driving like a P*ssy |
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Posted 13th Sep 2013 at 10:44
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superchargedblack1997gti6
Seasoned Pro Location: guildford Registered: 15 Aug 2009 Posts: 2,376 Status: Offline |
Post #29
My track rallye i get much more have seen 400 but it must weigh nearly 150kgs less than standard!________________________________________ Super high boost Completed, destroyer of gearboxes and 160mph club |
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Posted 13th Sep 2013 at 11:17
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #30
I am planning to strip some things out of mine. Back seats never get used so they may aswell go. But I want to wait till I have some money to do some other stuff too. Dont want it to look like I have just taken the seats out and done nothing else haha |
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Posted 13th Sep 2013 at 11:52
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #31
Just an update..I got 103miles out of the first half a tank not really paying attention to how I drove (but not driving like a D*ck). I then I got 99 miles to the next quarter of a tank trying my best never to go over 2k revs. I then got 62 miles to the remaining quarter. All in all 262.3 miles (23mpg). Ive just topped up with another 53litres so will see what the next tank gets  |
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Posted 18th Sep 2013 at 08:05
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dcc
Senior User  Location: Wales Registered: 24 Feb 2009 Posts: 502 Status: Offline |
Post #32
Ignore the quarters, they are in no way accurate nor consistent across cars, just do the miles per litres.you need to go over 2k, as there's bugger all torque under it, its no V6! you will be labouring it especially around Sheffield, however part throttle is king. ________________________________________ 205 GTIXsara HDI |
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Posted 18th Sep 2013 at 08:36
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #33
to be fair I haven't really needed to get over 2k... Apart from when I wanted to get past some annoying drivers.Sorry im a bit of a newb at all this car/ technical talk... What do you mean by Part Throttle? |
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Posted 18th Sep 2013 at 08:54
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armzsc6
Seasoned Pro  Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #34
Just got 27.5mpg driving the supercharged 6 to silverstone and back. In the morning was doing 90 everywhere as was in a hurry to meet another member to pick up some wheels. Drive back with 4 wheels and 2 tyres in the back as well as a mate so wasn't light weight. Wasn't driving like a twat but gave it some beans a good few times. Still pretty much 28mpg.________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 18th Sep 2013 at 10:23
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dcc
Senior User Location: Wales Registered: 24 Feb 2009 Posts: 502 Status: Offline |
Post #35
doon1988 wrote: Part Throttle? duurh. THINK ABOUT IT... FML ________________________________________ 205 GTIXsara HDI |
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Posted 18th Sep 2013 at 10:35
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #36
ok ok no need to be an arse  Like I say I aint very mechanical or owt so if you say part throttle I would take this to mean not using all the throttle but not having it so little revs. But that would seem a bit of an obvious explanation. So I assumed there was something more behind it as I am not sure how using more throttle that what I have been to be more efficient. Although I could be wrong. The matter of the fact is if I cane it I get about 200 to the tank. keeping it at around 2k I get 160 miles out of half a tank. Theres a few opinions on this site that 200-250 per tank is as expected for daily drive but then others who state they get around 350 no matter how they drive. When I get my car down the garage I will just get them to give it a once over as I dont think with all the different opinions and different mods that people have on their cars that I will get a true answer,,, |
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Posted 18th Sep 2013 at 10:41
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dcc
Senior User Location: Wales Registered: 24 Feb 2009 Posts: 502 Status: Offline |
Post #37
Nothing to do with mechanical mindedness, its simple common sense  250 a tank is very crap, but depends whether you mean a 50 litre fillup from the fuel light coming on, or a 60 litre running on fumes fill up, miles per tank really should not be used as a measurement of how much fuel they use. Most of the mods people on here don't have any effect directly on the engines fuel consumption, but indirectly from them driving like dicks because they think its a rocket ship that will outbrake and out accelerate anything on the road. ________________________________________ 205 GTIXsara HDI |
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Posted 18th Sep 2013 at 11:11
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #38
I tend to fill up as soon as I can from the red light is coming on. i.e. within a mile or 2. 10 miles at most depending where I am compared to a station. so by per tank I tend to be looking between 50 and 53 litres.Im going to start monitoring my miles very closely over the next few fill ups. Like I say earlier in the post I have a few issues on the car (not sure if they would affect MPG) - in that my low speed fans dont work so if in traffic my car gets very hot before cooling itself down and secondly that my car can randomly cut out when slowing down at slow speeds (when dipping the clutch) Possible ICV issue. Hopefully these could and will be the cause of my low mpg and if so should be fixed in the next month or so (fingers crossed)... |
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Posted 18th Sep 2013 at 11:22
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jimmyhackers
Seasoned Pro  Location: birmingham Registered: 14 Jun 2011 Posts: 1,090 Status: Offline |
Post #39
try some xado. i put in the grearbox stuff and the first treatment of engine stuff today. only done 13miles so far and it already feels a lot tighter and smoother. gears seem less crunchy when they engage. and theres far less engine vibration. a few engine noises have quietened down/stopped an it feels a fair bit pokier/responsive too. the treatments done after another two engine shots each at 100mile intervals but so far so good. for 30 quid im pretty chuffed. (please note my car was very unloved by previous owners) ________________________________________ the world is changed by people in sheds |
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Posted 19th Sep 2013 at 01:17
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #40
Cheers Jimmy.... My cars been pretty unloved by me for the last 3 years  I'll try some of that - to be fair though I dont really have any issues with gears other than first which can be a bit stiff first thing in a morning. But if I rev high in first there is a bit of vibration somewhere in the engine bay so I will give that a go see what it does.. Cheers |
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Posted 19th Sep 2013 at 07:57
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dcc
Senior User Location: Wales Registered: 24 Feb 2009 Posts: 502 Status: Offline |
Post #41
Dont bother, thats near the cost of a lambda, or a diagnostic check, which would be far more worthwhile.________________________________________ 205 GTIXsara HDI |
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Posted 19th Sep 2013 at 08:47
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #42
Just an update.Been monitoring for 3 full tanks now and my average is 25.5 mpg which is better than I had expected to be fair my MPG doesn't seem to differ whether its city or motorway. Still a bit lower than what some people have mentioned they are getting but then I suppose I am in Sheffield which is fairly hilly so that will be playing a role in this. I am going to keep monitoring going forward and will keep this updated with my MPG following any major work on the car in case I see any sizable/ noticeable increase afterwards which may then help people further down the line should they have similar questions. Probably worth noting that may latest tank (not quite empty) so far has done 282.4 miles but that has included a 160 mile round trip on Saturday down to Carl's in Leicester for a cambelt change. I can only apologise to Carl for the grief my car caused him with one of the issues we had not factored for. |
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Posted 21st Oct 2013 at 12:33
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jimmyhackers
Seasoned Pro Location: birmingham Registered: 14 Jun 2011 Posts: 1,090 Status: Offline |
Post #43
what were the issues you hadnt factord for?if somethings rattling you should probably find out what on a sad mpg note, i remember my 1.4 got brilliant mpg around 55 -60. thats was probly because i removed the back seats/carpets. de wiperd the rear, single wiper the front, cut of bonnet bracings, removed jack and spare wheel. de arialed it, tiny dtm wingmirrors, cut out a large portion of my rear bumper(this really helped). and many more analy retentive things in a mpg peformance quest. however dont do any of this... despite its amazing mpg and new found "performance" it was a 2 seater eyesore. ________________________________________ the world is changed by people in sheds |
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Posted 21st Oct 2013 at 18:44
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honestly3k
Seasoned Pro  Location: Berkhamsted Registered: 06 Apr 2009 Posts: 2,390 Status: Offline |
Post #44
I regularly got 370-430 per tank, this is filling up about 20miles after the red light has come on.But bare in mind mine was a motorway car. But I booted her daily....she lapped up the miles What you appear to be getting is way below what It should return. Something isn't right ________________________________________ ''Oh, it does handle like a golf!'' Why drive a Golf....when you can drive a GTi-6? |
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Posted 21st Oct 2013 at 19:42
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #45
honestly3k wrote: I regularly got 370-430 per tank, this is filling up about 20miles after the red light has come on. But bare in mind mine was a motorway car. But I booted her daily....she lapped up the miles What you appear to be getting is way below what It should return. Something isn't right That's what I thought but everyone before was saying my mileage was average. But . Have been getting aroun 300 to the tank last few weeks. And that's filling up as soon as I can after red light coming on with the majority being city driving so to be fair that isn'. Too bad compared to 370 all motorway I suppose |
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Posted 21st Oct 2013 at 20:59
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #46
jimmyhackers wrote: what were the issues you hadnt factord for? if somethings rattling you should probably find out what on a sad mpg note, i remember my 1.4 got brilliant mpg around 55 -60. thats was probly because i removed the back seats/carpets. de wiperd the rear, single wiper the front, cut of bonnet bracings, removed jack and spare wheel. de arialed it, tiny dtm wingmirrors, cut out a large portion of my rear bumper(this really helped). and many more analy retentive things in a mpg peformance quest. however dont do any of this... despite its amazing mpg and new found "performance" it was a 2 seater eyesore. One of the p bushes was knackered and whilst trying to replace that one of the bolts was sheered ended up having to cut an arm off and some cutting in to and rewelding of the subframe. Fun fun fun |
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Posted 21st Oct 2013 at 20:48
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bayley
Junior User  Location: buckley Registered: 03 Dec 2011 Posts: 81 Status: Offline |
Post #47
I put £30 in every time I fuel up and this always sees around 150miles and I rarely go below 4k rpm |
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Posted 21st Oct 2013 at 23:08
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #48
Just an update on this as I potentially seem to have sorted my issue...I recently had the alternator, clutch and vss changed. Since then I have gone from averaging 18/20mpg to 26/30 mpg and increasing so Im very happy at the moment. Im wondering if it could have either been the clutch or potentially the vss... My speedo didnt used to work due to the faulty vss so I am guessing that was potentially sending wrong signals to the ICV or on to something else causing all the mixtures to be wrong and lower my mpg. |
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Posted 21st May 2014 at 10:27
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scotzman
Seasoned Pro  Location: Dundee Registered: 24 Jun 2011 Posts: 1,408 Status: Offline |
Post #49
Or because your speedo wasn't working you were actually doing a lot more miles than you though.________________________________________ '90 1.6 205 GTi, '98 306 GTi-6 |
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Posted 21st May 2014 at 10:36
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doon1988
Regular Location: Sheffield Registered: 08 May 2011 Posts: 457 Status: Offline |
Post #50
nah I was google mapping every single journey and keeping a spreadsheet of all my journeys and miles for each journey etc. |
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Posted 21st May 2014 at 10:49
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