Making jet engines less fuel efficient?

[tjsnh]

Looking to make the stock jet engines less fuel efficient (double their fuel consumption). In the past i've only worked with modding rocket engines, and some of the data in the jets cfgs is odd.

Inside the .cfg file for the turbojet engine (as the example im working with) :
 

Spoiler

 

MODULE
    {
        name = ModuleEnginesFX
        engineID = Dry
        thrustVectorTransformName = thrustTransform
        exhaustDamage = True
        ignitionThreshold = 0.1
        minThrust = 0
        maxThrust = 85
        heatProduction = 15
        useEngineResponseTime = True
        engineAccelerationSpeed = 0.5
        engineDecelerationSpeed = 0.5
        useVelocityCurve = False
        flameoutEffectName = flameout
        powerEffectName = power_dry
        //runningEffectName = running_thrust
        engageEffectName = engage
        disengageEffectName = disengage
        spoolEffectName = running_dry
        engineSpoolIdle = 0.05
        engineSpoolTime = 2.0
        EngineType = Turbine
        exhaustDamageMultiplier = 5
        clampPropReceived = True
        PROPELLANT
        {
            name = IntakeAir
            ignoreForIsp = True
            ratio = 40
        }
        PROPELLANT
        {
            name = LiquidFuel
            resourceFlowMode = STAGE_STACK_FLOW_BALANCE
            ratio = 1
            DrawGauge = True
        }
        atmosphereCurve
        {
            key = 0 9000 0 0
        }
        // Jet params
        atmChangeFlow = True
        useVelCurve = True
        useAtmCurve = True
        flowMultCap = 1.1
        machLimit = 1.75
        machHeatMult = 20.0
        velCurve
        {
            key = 0 1 0 0
            key = 0.35 0.932 0 0
            key = 1 1.13 0.4510796 0.4510796
            key = 1.75 1.5 0 0
            key = 2 1.38 -1.126258 -1.126258
            key = 2.5 0 0 0
        }
        atmCurve
        {
            key = 0 0 1.069445 0.7244952
            key = 0.072 0.08 1.472049 1.472049
            key = 0.17 0.21 1.227685 1.227685
            key = 0.34 0.39 1.01426 1.01426
            key = 1 1 0.969697 0.969697
        }
    }
    MODULE
    {
        name = ModuleEnginesFX
        engineID = Wet
        thrustVectorTransformName = thrustTransform
        exhaustDamage = True
        ignitionThreshold = 0.1
        minThrust = 0
        maxThrust = 130
        heatProduction = 75
        useEngineResponseTime = True
        engineAccelerationSpeed = 0.8
        engineDecelerationSpeed = 0.8
        useVelocityCurve = False
        flameoutEffectName = flameout
        //powerEffectName = running_wet
        runningEffectName = power_wet
        engageEffectName = engage
        disengageEffectName = disengage
        spoolEffectName = running_wet
        engineSpoolIdle = 0.05
        engineSpoolTime = 2.0
        EngineType = Turbine
        exhaustDamageMultiplier = 20
        clampPropReceived = True
        PROPELLANT
        {
            name = IntakeAir
            ignoreForIsp = True
            ratio = 12
        }
        PROPELLANT
        {
            name = LiquidFuel
            resourceFlowMode = STAGE_STACK_FLOW_BALANCE
            ratio = 1
            DrawGauge = True
        }
        atmosphereCurve
        {
            key = 0 4000 0 0
        }
        // Jet params
        atmChangeFlow = True
        useVelCurve = True
        useAtmCurve = True
        flowMultCap = 1.1
        machLimit = 1.75
        machHeatMult = 20.0

        velCurve
        {
            key = 0 1 0 0
            key = 0.18 0.97 0 0
            key = 0.43 1 0.202683 0.202683
            key = 1 1.42 1.280302 1.280302
            key = 2.5 3.63 0 0
            key = 3 0.58 -2.708558 -2.708558
            key = 3.35 0 -0.6150925 0
        }
        atmCurve
        {
            // less linear because AB has a big ram effect at high speed at high alt.
            key = 0 0 1.666667 1.666667
            key = 0.07066164 0.1397133 1.961396 1.961396
            key = 0.34 0.56 1.084002 1.084002
            key = 1 1 0.5302638 0.5302638
        }
    }

 

Anyone have any idea what to modify in here to tweak/cut the fuel efficiency?

[riocrokite]

I would start with this part:
 

Quote

 

        atmosphereCurve
        {
            key = 0 4000 0 0
        }

 

the second number is an engine isp.

[tjsnh]

6 minutes ago, riocrokite said:

I would start with this part:
 

the second number is an engine isp.

So just chopping those values in half will nerf the jets same as it would for a "Regular" rocket?

[riocrokite]

Just now, tjsnh said:

So just chopping those values in half will nerf the jets same as it would for a "Regular" rocket?

yah. the added benefit of isp written as a curve (flat one in this example) is that you can specify isp of an engine depending on atmospheric pressure.

[tjsnh]

Perfect, thanks.
I do a lot of contract pack development, and some of the stuff I'm working on (fly a course through some waypoints, etc) is way WAY too easy when a small fighter-sized jet without using drop-tanks or anything can get to the polar ice caps and back on a single load of fuel .....