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  1. #1
    270bhp 13.6 1/4 mile

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    Weird S3 fuel economy issue

    Hey guys, firstly my car has no fault codes, maf is great, no timing pull, no boost leaks, cts and stat are great too. Now on the highway the car is very light on fuel(2.8-7.5l/100km) but in town(short trips) its disgustingly heavy on fuel(12.5l/100km), it used to be very light in town but now its the opposite. What could be wrong? , please help because its costing me alot of money and i mostly do town driving and i avoid using the aircon, even if i keep the rpm low and barely use the accelerator the least i get is 12.5l yet i used to get 5-8l in town with 3000rpm shifts, 25% throttle and aircon on. Thanks
    Silver 2001 Audi S3 quattro.
    GIAC, Samco TIP, catless mandrel bent 2.5'' 2 box exhaust, Aquamist WMI, SPEC stage 1 clutch, N249 bypass, Forge Spltr DV, Oil catch can, colder Bosch super 4 plugs. Has audio and cosmetics too

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  3. #2
    S3KO4's Avatar
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    Very good times at 13.6! what turbo is that? Try injector cleaning, clean fuel filter, general servicing, plugs etc, look for leaks & split hoses. and also check previous post here, cloged FPR might have something to do with it, and Lambda logs, something Badger, mentioned in a post by Westle.
    S3-8L REVO stage 2, Milltek, 3" DP & custom 3" decat, RS2 spark plugs, 4 bar FPR, Green-Cotton uprated upper/lower boost hose & TIP, Front Zimmerman & Ferrodo. LCR spliter. boost gauge, smoothed AB. Aero blades, H&R 5mm spacers. Best time 14.03sec, 0-62 in 5.7sec. 207gs @ 25psi , polished inlet mani. VAGCOM 805.1

  4. #3
    270bhp 13.6 1/4 mile

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    Stock turbo thanks, cleaned injectors. New fuel filter, serviced it. No leaks or splits, will look into the fpr but how can it get clogged? . Which meas. block is the lambda log? And what figures should i get?
    Silver 2001 Audi S3 quattro.
    GIAC, Samco TIP, catless mandrel bent 2.5'' 2 box exhaust, Aquamist WMI, SPEC stage 1 clutch, N249 bypass, Forge Spltr DV, Oil catch can, colder Bosch super 4 plugs. Has audio and cosmetics too

  5. #4
    S3Steve's Avatar
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    You say your using 12.5 litres per 100km when doing short trips round town? Thats 22.5mpg which doesnt seem too bad for short trips round town to be honest, maybe a little low but could be explained by the lower temps this time of year mate.
    Last edited by S3Steve; 2nd March 2011 at 20:21.
    2007 A3 TDI 170 S Line
    Sold - 2002 S3

  6. #5
    270bhp 13.6 1/4 mile

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    Yep its 25mpg to be precise, i used to get 40/45mpg in town! . And im not in UK, its hot here(30 deg. C)
    Silver 2001 Audi S3 quattro.
    GIAC, Samco TIP, catless mandrel bent 2.5'' 2 box exhaust, Aquamist WMI, SPEC stage 1 clutch, N249 bypass, Forge Spltr DV, Oil catch can, colder Bosch super 4 plugs. Has audio and cosmetics too

  7. #6
    666markyboy's Avatar
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    40/45 mpg ????? i doubt that very much i don't get anywhere near that on a motorway run out of a stock 1.8t Quattro in fact i'm lucky to get into 30's and thats driving it carefully
    1999 A3 Quattro 1.8T Pics >>HERE
    2002 A4 Avant quattro 1.9 TDi

  8. #7
    superkarl's Avatar
    MAN OF STEEL

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    what your saying your getting is normal to me.

  9. #8
    270bhp 13.6 1/4 mile

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    40mpg carefully, lambda logs -0.9% add. -2.3% mult.
    Silver 2001 Audi S3 quattro.
    GIAC, Samco TIP, catless mandrel bent 2.5'' 2 box exhaust, Aquamist WMI, SPEC stage 1 clutch, N249 bypass, Forge Spltr DV, Oil catch can, colder Bosch super 4 plugs. Has audio and cosmetics too

  10. #9
    JS1500's Avatar
    Howdy

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    thermostat? What is your temp gauge saying?
    2001 Audi RS4 2.7 Bi-Turbo - Nogaro Blue

    1975 MG Midget 1500 - Tahiti Blue

    2003 Audi S3 - Dolphin Grey; SOLD!

  11. #10
    S3Steve's Avatar
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    Quote Originally Posted by Jade S3 View Post
    Yep its 25mpg to be precise, i used to get 40/45mpg in town! . And im not in UK, its hot here(30 deg. C)
    Christ 40/45mpg in town, ive never managed to get over 35mpg on a run driving like an old granny!
    2007 A3 TDI 170 S Line
    Sold - 2002 S3

  12. #11
    Dani_B19's Avatar
    Audi-sports own special child.

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    If your getting that type of mpg round town then you've got a faulty dash, thats impossible, highest ive know anyone get is about 38mpg and thats sat in the slow lane doing 70mph in 6th gear.
    Driving the most secretive S3 on ASN

  13. #12
    270bhp 13.6 1/4 mile

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    Changed the thermostat and gauge is at 90, driving like a granny and getting 23mpg in town is still hectic. Why is it so heavy? , i would be so excited if i could get 35mpg in town
    Silver 2001 Audi S3 quattro.
    GIAC, Samco TIP, catless mandrel bent 2.5'' 2 box exhaust, Aquamist WMI, SPEC stage 1 clutch, N249 bypass, Forge Spltr DV, Oil catch can, colder Bosch super 4 plugs. Has audio and cosmetics too

  14. #13
    S3Steve's Avatar
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    I think the problem is mate, that to everyone on this forum your current mpg seems about right. Are the mpg figures your quoting off the dis or proper calculated ones?
    Last edited by S3Steve; 4th March 2011 at 19:04.
    2007 A3 TDI 170 S Line
    Sold - 2002 S3

 

 

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