terawua Posted January 31, 2005 Share Posted January 31, 2005 Just thought I would update you on the fuel consuption problem I have had (for about a year.. dont worry I only drive about 1000 miles a year so hopefully no bore wash of hole burnt in my pocket) I recently took delivery of my EL dials from Miami GT just after christmas (very nice btw Paul) I had my original J-spec dials which came with the car sitting around at home, so I popped the EL dials on them to see what they looked like... to expedite things I then put the old dials with EL back in the car and swapped out the newer UK spec dials I had bought from the breakers. Suffice to say as well as my instruments glowing a lovely blue now to match the Air con cluster, my fuelling problem has gone away and instead of getting 160-170 miles per tank no matter how careful I was, my fuel mileage has leaped to 285 miles per tank, which at my caulculations means a difference of 12.9MPG vs 21.6MPG, plus the car drives much better, smoother and less hesitation and surging. So..... a question for the resident elctronic/tuning wizards (esp Pete Betts) what do you think of this and has anyone seen anything like it? Does anyone know of a situation where the speedo input can affect the fuelling? Suffice to say I think I will give much consideration to a speed limit cut device from THOR as I am not confident in what is going on right now with my car. James Link to comment Share on other sites More sharing options...
Whitelightning Posted February 1, 2005 Share Posted February 1, 2005 Well that solves that mystery. Miami-GT can now officially market EL Glow dials as proven to "save you fuel" I had better get over there and grab some. Link to comment Share on other sites More sharing options...
terawua Posted February 1, 2005 Author Share Posted February 1, 2005 well *ahem* I was just wondering if anyone else had problems with fuel consumption on a J-spec when using UK instrument clusters..... Link to comment Share on other sites More sharing options...
CJ Posted February 1, 2005 Share Posted February 1, 2005 I would be surprised if it's anything to do with the UK instrument cluster - but can offer no explaination as to why it has changed Link to comment Share on other sites More sharing options...
Guest Rays the roof Posted February 1, 2005 Share Posted February 1, 2005 So there not Glo faster dials then! I'll get my coat...... Link to comment Share on other sites More sharing options...
Ian C Posted February 1, 2005 Share Posted February 1, 2005 Maybe the UK spec fuel gauge goes down twice as fast -Ian Link to comment Share on other sites More sharing options...
Pete Posted February 1, 2005 Share Posted February 1, 2005 This is just too bizarre. Link to comment Share on other sites More sharing options...
terawua Posted February 1, 2005 Author Share Posted February 1, 2005 From my point of view I am glad to have it sorted out... but I mean I have rest the ECU so many times, bought a new airfilter, new lambda probe picked everyones brains on here, and then it ends up being sorted by putting the original J-spec dials back in.... very very odd. Here's to 23 MPG! James Link to comment Share on other sites More sharing options...
Red Posted February 1, 2005 Share Posted February 1, 2005 maybe it was just a guaging error with your old dials and you were getting incorrect readings due to miscommunication. (i.e you were seeing an empty tank when in fact you still had half a tank) I would think it incredibly unlikely that your dials would directly influence your effieciency! Link to comment Share on other sites More sharing options...
Whitelightning Posted February 1, 2005 Share Posted February 1, 2005 See - I told you he'd never know we were syphoning his fuel out Link to comment Share on other sites More sharing options...
Supragal Posted February 1, 2005 Share Posted February 1, 2005 TECHNICAL SECTION Link to comment Share on other sites More sharing options...
terawua Posted February 1, 2005 Author Share Posted February 1, 2005 well, Red, I measured the trips as well on a map, but I know I was putting in the same amount as it costs approx 50 quid to fill up and I always fill up to the top, so It cant be the gauging, it has to be something to do with speed pulse signals not matching up to throttle poisition sensors or something. I really dont know, the whole thing is very odd and I cant explain it. Link to comment Share on other sites More sharing options...
penguin Posted February 1, 2005 Share Posted February 1, 2005 well, what really suprises the heck out of me is how some people say they are hitting 28+ mpg on a mk4 twinturbo..... i mean, is that even possible?? what mods would u need? Link to comment Share on other sites More sharing options...
Hy-Performance Posted February 1, 2005 Share Posted February 1, 2005 This is soooo strange, will be looking forward to Petes reply Chris Link to comment Share on other sites More sharing options...
heckler Posted February 1, 2005 Share Posted February 1, 2005 well, what really suprises the heck out of me is how some people say they are hitting 28+ mpg on a mk4 twinturbo..... i mean, is that even possible?? what mods would u need? I managed to get 390 miles out of a 60L tank... not too bad. And I have stage 3 hybrids, 550cc injectors, FMIC, FSE. Link to comment Share on other sites More sharing options...
geoffvalenti Posted February 1, 2005 Share Posted February 1, 2005 well, what really suprises the heck out of me is how some people say they are hitting 28+ mpg on a mk4 twinturbo..... i mean, is that even possible?? what mods would u need? I'm getting about 17-18 this weather with short journeys. I suppose if I drove it like a granny I'd get a bit more, but then I may as well get a boring car, if I'm going to drive the Supra like one. My fuel consumption is definitely worse since I put the Bilsteins on. Its either a mysterious link between shock absorbers and the ECU, or because it handles so much better that I give it more stick Link to comment Share on other sites More sharing options...
penguin Posted February 1, 2005 Share Posted February 1, 2005 how did u manage that?? mine is a stock jspec twin turbo (auto) mk4... only mods done are a hks induction kit (the big green mushroom) and a greddy type s Bov.... the most i ever got is around 298 miles on a full tank (think it was a trip to leeds ).... Link to comment Share on other sites More sharing options...
Whitelightning Posted February 1, 2005 Share Posted February 1, 2005 WL used to do between 8 - 18 mpg from Track to cruise. She had 720 injectors and T88 so sucky sucky with the fuel. Link to comment Share on other sites More sharing options...
Thorin Posted February 1, 2005 Share Posted February 1, 2005 Well I know my odometer under-reads a bit, when it says I've done 100 miles I've actually done about 130. Been like it ever since I got the car and I've not been bothered to do anything about it. I assume it's to do with calibration with the KM to Miles conversion. Link to comment Share on other sites More sharing options...
chris_bramley Posted February 2, 2005 Share Posted February 2, 2005 Right now I'm piqued too. My consumption is about £50-£55 of optimax (ie a full tank) to a grand 220 miles / 350 km MAX. jspec injectors, the only thing I have is hybrids and an hks evc 5 in terms of fuel change - any ideas? Although rumour has it the guy before me had it "tuned" by tuning japanese and the enginge mgmnt light comes on now at sustained boost with low revs (ie bosting lightly in 4th upwards), then the tc turns off. :eek2: reckon they mucked with my fuel ratios? Could be running rich which might explain the lack of power and stupid drinking Link to comment Share on other sites More sharing options...
terawua Posted February 2, 2005 Author Share Posted February 2, 2005 Hmm, didnt think about the way I drove particularly on that 22mpg run, but I really enjoyed myself on the road from Windsor to Bracknell on the way to Bracknell Tyres, so I did see the fuel gauge go down a fair way on just that part of the trip so maybe for the rest of the tank I was somewhere in the 24-25mpg range, and most of the time I drove that tank in West London. As fr the MPG with mods, well I would assume as long as you are cruising off boost you are only using the minimal amount of fuel, and maybe even less than stock as you will have a less generous fuel map for low loads/revs, depends on your mapping I suppose... anwyay, time t PM Pete Betts for his tuppence worth James Link to comment Share on other sites More sharing options...
terribleturner Posted February 2, 2005 Share Posted February 2, 2005 I'm getting about 17-18 this weather with short journeys. Yeah mine does about 17 mpg, and a tank does me for roughly 250 miles. But im sure it should be better Link to comment Share on other sites More sharing options...
chris_bramley Posted February 2, 2005 Share Posted February 2, 2005 Yeah I'm getting under 17mpg. This is ridiculous - I'd expect that if I was running bigger injectors, a big single and an uprated ecu! I don't cane it everywhere and I have never got 250 miles, even. 220 odd is the utmost I can get. I'm upgrading soon to an aem full system with guage and getting thor to tune the bitch properly. be interesting to see if it gets much worse - in theory it should be more efficient if it's running rich atm... or at least provide far more power for the same amount! Link to comment Share on other sites More sharing options...
Jake Posted February 2, 2005 Share Posted February 2, 2005 in theory it should be more efficient if it's running rich atm... or at least provide far more power for the same amount!I don't think either of those statements are right Chris. Link to comment Share on other sites More sharing options...
chris_bramley Posted February 2, 2005 Share Posted February 2, 2005 I don't think either of those statements are right Chris. No no... don't hold back. Say what you really think. I'm not seriously suggesting it's going to go UP... but I doubt it will go down too much if it's correctly tuned. If the car IS running rich atm and not responding properly, it's wasting fuel to get anywhere, correct? So if it's tuned properly, it should run more efficiently - in proportion, ie wasting less fuel. Or is that wrong? do people WASTE more fuel when they tune their cars up and install uprated ecu's and have them professionally tuned? I hope not. I'd like a pro to tune my car for the max power for the min fuel expenditure, ie not too lean not too rich. perhaps I am wrong about the point of tuning then All I'm saying is that if I continue to drive as I do after the ecu replacement (no other mods added, just that) then it shuold be more efficient at the same job than the labouring stock with engine management issues etc etc. Link to comment Share on other sites More sharing options...
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