Dyno vs Rolling road
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  1. #1
    Dragging not Bragging vince-305's Avatar
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    Dyno vs Rolling road

    Whats best for what ?

    How much difference in power ratings and what sort of drive line power loss do you get
    Bit'z 'N' Piece's
    Ford consul mk2 chevy powered highrider

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    Administrator blackpopracing's Avatar
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    Rolling road.
    Dyno is good, but rolling road is 'real world' conditions that take into account all the other factors like gearbox/axle/fuelling etc.

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    Rods 'n' Sods Junkie alan's Avatar
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    If you speak to someone with a dyno they will tell you its the proper way, and you then get the proper engine readings.

    If you speak with someone with a rolling road they will sell you a sesion on their road, they get a reading at the wheel then estimate the power loss through the transmission.

    Then theres the guys who swear by live mapping ( if you got injection, lambda etc), roaring up the road then read back the data from a laptop before tweaking the map.

    Suppose a dyno gets it right from the offset before you put the engine in the car, Then rolling road to tweak it as it might be set up diferent ( exhausts, cooling, fuel supply)

    Dont now where you are but John Sleath (yorkshire) has both as does Track and Road in Rainham Essex
    Last edited by alan; 26-01-2010 at 19:37.

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  6. #4
    I'm a grown up member now ! pussy's Avatar
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    track & road is the derby & joan club they drove me mad never again

  7. #5
    My name is Martin 30psi's Avatar
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    I've been to Track and Road lots of times now. One of the Steve's loves talking and talking, you'll be there till midnight. They were good to me though and helped me solve a few issues.

    They'll tell you the engine dyno is best followed by their rolling road.

    On a manual car they will drive it up to 3rd or 4th and give it the blast on the rollers. Once peak rpm is hit they dip the clutch and let the transmission wind down. That shows a negative bhp reading, which they then deduct from the wheel reading (i.e add back) to get an engine output reading. The engine dyno is more accurate though. A mate of mine had to have his engine out and dyno'd and mapped as the car kept spinning up on the rollers. With an auto, they will just give you a wheel bhp figure.

    An engine dyno is a pain in the arse to setup compared to a drive on rolling road.

    They did however 'apparantly' cock up someone's Corvette, they removed the kick down linkage and apparantly it burnt out the bands. Not too sure on the facts though

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    Rods 'n' Sods Junkie
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    ive had a mates car dyno'd before.

    toyota glanza. 1.3 turbo. kicked out 187bhp at the fly.

    went to another dyno and it kicked out 176bhp.

    the reason for this was showd to us by the guys that took the lower reading.

    it was to do with ambient and inlet air temp. if you like about the ambient temp it will raise the figures.

    and the proof was on paper. at 17 degrees ambient and i think 15 degreese inlet it was 178 and at a bull**** 50+ degreese ambient and 15 degreese inlet it was 187.

    there shouldnt be not more than 2 degreese difference aparently.

    tough choice i guess.

    ive herd live mapping/setting up is the nuts.

  9. #7
    My name is Martin 30psi's Avatar
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    Yeah the dyno correction factor can be used to bodge the readings.

    For geeks - Most dyno print out show the temp and the air pressure so people can adjust for it afterwards to get what is an industry standard reading. If the temp was 25C and air pressure was 990mb there would be no adjustment made

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