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Thread: Increasing mpg through bhp

  1. #1
    Regular Member owen_999's Avatar
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    Vehicle : Vectra SRI 150

    Trim : SRI

    Engine : 1.9cdti 150

    Year : 2007

    Exclamation Increasing mpg through bhp

    Hey guys been having this argument with a house mate (motorsport student so "knows everything") for a while but how would a remap and bhp increase help me increase my mpg?
    I assume it would be through extending the power curve and smoothing it out but his argument is that just the increase in bhp will reduce my mpg. Surely a correctly applied remap and bhp increase should help my mpg.

    anybody know a definitive argument because I'm fed up of being called and idiot before I give him what for.

  2. #2
    Regular Member Signum-Steve's Avatar
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    Vehicle : Jaguar S-Type V6

    Trim : Sport

    Engine : Petrol

    Year : 2003

    Default

    To get more BHP you need to burn more fuel. You can optimize fuel consumption with a map, however for an increase in power you must burn more juice IMO.
    So in normal every day driving when the power ain't used you could probably increase fuel economy. On the flip side when booting it the consumption will be more.

  3. #3
    Regular Member stevoxsi's Avatar
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    Vehicle : Insignia

    Trim : Sri Vx-line

    Engine : 2.0 Cdti 160

    Year : 2011

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    You'll maybe tend to change up quicker which the extra torque. Problem is you'll more than likely boot it with the extra power instead!

  4. #4
    Regular Member owen_999's Avatar
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    Vehicle : Vectra SRI 150

    Trim : SRI

    Engine : 1.9cdti 150

    Year : 2007

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    Yh and that's my exact argument. I want more power to play with but I also do excessive miles on the motorway just sat in cruise control at 70. Can't regularly afford to fly about everywhere.

  5. #5
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    At 70mph, you can not increase the fuel economy of the 1.9cdti or other engine with similar gearing as you are already happily driving in 6th gear. As stated, the only way to improve economy with tuning is to reduce torque/power by burning less fuel OR increase low down torque/power to allow a higher gear to be used at lower rpm, thus burning less fuel again.

  6. #6
    Regular Member stevoxsi's Avatar
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    Vehicle : Insignia

    Trim : Sri Vx-line

    Engine : 2.0 Cdti 160

    Year : 2011

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    Well the real saving should come from changing up sooner, although there is debate on that reducing the life of dmf's. More vibration a lower revs. But at the very least cruising at 70 should use no more fuel. You need a certain amount of power to do 70. The car hasn't changed, so it's the same after a remap to overcome the friction of the road, air etc. Same power, same amount of energy therefore same amount of fuel. The savings imo are changing up quicker when accelerating, and down less when overtaking.

    But like I said, power is addictive, and I know when I come to remap mine, I'll still drop to fourth and just go past faster!

  7. #7
    Regular Member Teapot's Avatar
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    Vehicle : Signum

    Trim : Design+

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 101000

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    I haven't remapped my car for maximum bhp, but rather for low-end torque and economy.

    The standard mapping is a compromise between emission regs and fuel consumption. I've experienced better average fuel economy since making the following changes:
    1. EGR disablement
    2. 1-3 degree advance in start of injection at low-mid rpm and injection quantity
    3. Reduction in requested boost pressure in same area.
    4. Opening of VNT vanes at low iq (seems to reduce engine-braking thus allowing deceleration phase to begin earlier when approaching a hazard).

  8. #8
    Regular Member owen_999's Avatar
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    Vehicle : Vectra SRI 150

    Trim : SRI

    Engine : 1.9cdti 150

    Year : 2007

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    Makes sense. See I thought that if the car developed more power then it would require the engine to work less to achieve the same results?

  9. #9
    Regular Member stevoxsi's Avatar
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    Vehicle : Insignia

    Trim : Sri Vx-line

    Engine : 2.0 Cdti 160

    Year : 2011

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    Essentially you have the right idea. But you yourself work it less by keeping the revs down.

  10. #10
    Regular Member coolcat's Avatar
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    Vehicle : vectra

    Trim : sri

    Engine : 1.9 cdti 150

    Year : 08

    Mileage : 72000

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    so basically unless you drive like your grandad in his austin A10 the 10 to 20% fuel increase is bull.

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