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Derating a 2.0 TDI for better fuel effiency.

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  • Derating a 2.0 TDI for better fuel effiency.

    Been reading about the new Audi A3 and the newish 1.8 litre diesel.
    Supposed to be the old Golf/polo 1.9 derated to 77 kw and with a few other
    changes in the box they have the fuel consumption down to 4.5L/100km.

    Question is would it be possible to derate a 2.0tdi and get better efficiency.
    Been a few threads in the past about chipping and getting better economy so what about derating.
    So far VWAus have been hopeless at answering my question.

  • #2
    if you ran less fuel in the maps and less boost, you would get better economy (providing you werent trying to make up for the power loss by driving harder).

    smaller capacity will usually allow lower fuel consumption for any given scenario... 2.0l down to 1.8 is a 10% reduction, and so that accounts for a fair chunk of the improvement.... maybe
    '07 Touareg V6 TDI with air suspension
    '98 Mk3 Cabriolet 2.0 8V
    '99 A4 Quattro 1.8T

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    • #3
      Originally posted by neil View Post
      Been reading about the new Audi A3 and the newish 1.8 litre diesel.
      Supposed to be the old Golf/polo 1.9 derated to 77 kw and with a few other
      changes in the box they have the fuel consumption down to 4.5L/100km.

      Question is would it be possible to derate a 2.0tdi and get better efficiency.
      Been a few threads in the past about chipping and getting better economy so what about derating.
      So far VWAus have been hopeless at answering my question.
      Have you tried driving more economically? It would be easier than faffing about derating the engine.

      I won a fuel economy competition in a showroom stock (even had 32psi in the tyres) Golf 1.6 petrol automatic - we achieved 4.56L/100km driving a 160km course from Sydney up to the Blue Mountains & back.
      carandimage The place where Off-Topic is On-Topic
      I used to think I was anal-retentive until I started getting involved in car forums

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      • #4
        I'm sure if you disabled the turbo, it'd be far more economical, but take you most of the night to get home from work....
        2014 Skoda Yeti TDI Outdoor 4x4 | Audi Q3 CFGC repower | Darkside tune and Race Cams | Darkside dump pDPF | Wagner Comp IC | Snow Water Meth | Bilstein B6 H&R springs | Rays Homura 2x7 18 x 8" 255 Potenza Sports | Golf R subframe | Superpro sways and bushings | 034 engine mounts | MK6 GTI brakes |

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        • #5
          Originally posted by brad View Post
          Have you tried driving more economically? It would be easier than faffing about derating the engine.

          I won a fuel economy competition in a showroom stock (even had 32psi in the tyres) Golf 1.6 petrol automatic - we achieved 4.56L/100km driving a 160km course from Sydney up to the Blue Mountains & back.
          After 10000 k's I have an average of 4.8L/100km and this is mostly Hwy.

          Was just curious if I could improve on this when the official usage for a jetta is 5.8L/100 ,
          So if the new Audi is 4.5L/100km than maybe it would be possible to get 3.5L/100 from My Hwy driving.

          Had an update from my dealer today saying the new VW MY09 TDI's will not be fitted with the new 7 speed DSG,
          only the TSI engines at this stage.

          Comment


          • #6
            Originally posted by neil View Post
            After 10000 k's I have an average of 4.8L/100km and this is mostly Hwy.

            Was just curious if I could improve on this when the official usage for a jetta is 5.8L/100 ,
            So if the new Audi is 4.5L/100km than maybe it would be possible to get 3.5L/100 from My Hwy driving.

            Had an update from my dealer today saying the new VW MY09 TDI's will not be fitted with the new 7 speed DSG,
            only the TSI engines at this stage.
            lol how fast (slow) do you drive on the highway!?
            2x Caddy, 1x Ducato

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            • #7
              Originally posted by Mischa View Post
              lol how fast (slow) do you drive on the highway!?
              Probably not as quick as you Misch!

              Cheers

              George
              06 Jetta 2.0TFSI Killed by a Lexus!
              09 Eos 2.0TSI DSG Loved this car but has now gone to a new home!!
              14 EOS 2.0 TSI has arrived!

              Comment


              • #8
                Originally posted by neil View Post
                After 10000 k's I have an average of 4.8L/100km and this is mostly Hwy.
                That's pretty good.

                Getting 4.56L/100km out of the petrol motor was painful to say the least but I had an enjoyable few hours sharing the driving with a guy who was a famous motorsports nutter. Won $5k too

                Do you run high(ish) tyre pressures or the low rolling resistance tyres?

                I reckon my 6th gear is too low - I'd like it to be revving about 500rpm less @ 110kph
                carandimage The place where Off-Topic is On-Topic
                I used to think I was anal-retentive until I started getting involved in car forums

                Comment


                • #9
                  Originally posted by Mischa View Post
                  lol how fast (slow) do you drive on the highway!?
                  Mischa.

                  I always give myself plenty of time to get to my destination, If I get the chance to slow down due to light traffic I do.
                  I do not hold up the traffic on the Newcastle/Sydney Fwy as anybody knowing this Fwy it would be a death sentence.
                  If I get the chance to slow down its usually at 90km/h.
                  If late at night it takes just over 10 mins extra if driving at 90km/h.

                  Comment


                  • #10
                    Originally posted by brad View Post
                    That's pretty good.

                    Getting 4.56L/100km out of the petrol motor was painful to say the least but I had an enjoyable few hours sharing the driving with a guy who was a famous motorsports nutter. Won $5k too

                    Do you run high(ish) tyre pressures or the low rolling resistance tyres?

                    I reckon my 6th gear is too low - I'd like it to be revving about 500rpm less @ 110kph
                    Brad.
                    Running tyres at 40psi.
                    Not game to ask what the cost of roll resistance tyres are.
                    Neil.

                    Comment


                    • #11
                      Originally posted by gldgti View Post
                      if you ran less fuel in the maps and less boost, you would get better economy (providing you werent trying to make up for the power loss by driving harder).

                      smaller capacity will usually allow lower fuel consumption for any given scenario... 2.0l down to 1.8 is a 10% reduction, and so that accounts for a fair chunk of the improvement.... maybe
                      Dealer says derating would cost more than the savings.

                      Comment


                      • #12
                        Originally posted by neil View Post
                        Mischa.

                        I always give myself plenty of time to get to my destination, If I get the chance to slow down due to light traffic I do.
                        I do not hold up the traffic on the Newcastle/Sydney Fwy as anybody knowing this Fwy it would be a death sentence.
                        If I get the chance to slow down its usually at 90km/h.
                        If late at night it takes just over 10 mins extra if driving at 90km/h.
                        yep thats fine not having a go at you just seems like ultra low consumption
                        2x Caddy, 1x Ducato

                        Comment


                        • #13
                          Originally posted by Mischa View Post
                          yep thats fine not having a go at you just seems like ultra low consumption
                          Mischa
                          My dealer mentioned today my fuel economy fairly normal for a Jetta as the drivers are more economical with the right foot than Golf owners, especially the GT owners.

                          90% of my driving is on the Fwy. also try not to stop at the lights, just cruise up to them and go and this has also shown a big saving around town.

                          Just read your Audi S2 thread nice one.
                          Neil.

                          Comment


                          • #14
                            Originally posted by neil View Post
                            Brad.
                            Running tyres at 40psi.
                            Not game to ask what the cost of roll resistance tyres are.
                            Neil.
                            Michelin do 2 or 3 versions. I think they universally label them ENERGY. eg MXV ENERGY...... /searches. These ones

                            My simple mind tells me that less resistance=less grip but we had the XM1 Energy as OEM on a Toyota Avensis Verso (people mover) and you had to drive like a ****head to make them lose grip.

                            In these days of speed cameras, wowsers & high fuel prices it's almost more fun trying to achieve ridiculously low fuel economy than going fast. (did I say that!)
                            carandimage The place where Off-Topic is On-Topic
                            I used to think I was anal-retentive until I started getting involved in car forums

                            Comment


                            • #15
                              Cheapest way to use less fuel is to put a bigger return spring on the accelerator.

                              Cruise control seems good at accelerating efficiently. Perhaps it could be modded to accelerate from rest.

                              Cheap fun is going round corners without slowing down (much).
                              2015 Polo Comfortline 6M + Driving Comfort Package
                              2011/11 Yeti 103 TDI 6M + Columbus media centre/satnav
                              (2008 MY09 Polo 9N3 TDI retired hurt hail damage)

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