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Sweet Spot

Discussion in 'Elio Drivetrain' started by JEBar, Nov 2, 2014.

  1. JEBar

    JEBar Moderator Staff Member Moderator

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    we just got back from visiting a friend and on the way over I checked the RPM's turned by our Chevy 5.3 V8 gasoline powered truck ....1,700 rpm = 70 mph .... same is true for my wife's 6 cylinder Chevy .... your rig turning 3,800 caught me by surprise ... you must really have a solidly built engine to turn that many RPM's and hold together over time

    Jim
     
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  2. wheaters

    wheaters Elio Addict

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    Last edited: Nov 2, 2014
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  3. JEBar

    JEBar Moderator Staff Member Moderator

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    is that car for on track use only ?

    Jim
     
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  4. wheaters

    wheaters Elio Addict

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    No, definitely not!
    It can go on the track, be used for off road trials, as in that video, and I've also done 250 miles on the road over the last three days (just my fun days out).
    I took the car to Spain in July. My son and I drove 2500 miles over eight days, including going over the Picos and Pyrenees mountains into France and northbound back to UK.

    th_VIDEO0343.mp4.jpg
     
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  5. JEBar

    JEBar Moderator Staff Member Moderator

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    remarkable .... there aren't many vehicles out there with that level of flexibility

    Jim
     
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  6. StuartGrant

    StuartGrant Elio Addict

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    What you're looking at in scientific terms is the Brake Specific Fuel Consumption (BSFC), a measure of the mass of fuel used per work hour. In the below graph the islands under the curve are different points of BSFC, so for this 1.9L saturn engine optimum fuel consumption is 250g/kw-hr at between 1500 and 3500 RPM, under a load of between 90Nm and 150Nm of torque. Elio mentioned this during one of the recent engine talks as a matter of fact. It was part of the reason they couldn't just use the Geo engine, because it was designed with the load of the Metro/Swift in mind, the Elio will have much less drag at highway speed than the Metro did, and thus the engine has to be designed around that, because there's only so much you can mess with gearing to get within that center island.
    Saturn_99_1.9l_dohc_bsfc.jpg
     
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