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Streetracing.co.za • View topic - My first 1/4mile event with my 1.3 ever! *Pics added*
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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Thu Jan 10, 2013 1:30 pm 
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The unos all broke the shaft that the spider gears are on too, throwing it all out of the housing, usually my making its own hole lol.

I replaced 4 gearboxes AND replaced 3 or 4 of those shafts when I felt something wrong before it broke.

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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Fri Jan 11, 2013 5:30 pm 
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again. nice time boet. i got a set of semi's hook up for the next event. when you say wkw, is that wheel kilowatts? how do they measure that

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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Fri Jan 11, 2013 7:41 pm 
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Yes that is wheel kilowatts, up here they dyno the car and the power they get is corrected for up here, at the wheels.

Even street tyres just warm them up and keep them 1.8 bar ish

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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Sat Jan 12, 2013 9:09 am 
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did a little research last night and found that the dyno (CHASSIS DYNO METER) as we know it, can only measure spinning power and force at the wheels, as its the wheels thats on the rollers, fly wheel kw is measured on a bench dyno, usually at factories and without any load what so ever. NO gearbox,diff,alternator ,body ,etc. then theres a dyno that measures from the hub, as this would eliminate variables like tyre size, preasure ,etc.
also there cant be a formula to convert fly wheel kw to wheel kw, as there is to many factors to consider. like light weight parts, factory imperfections etc.
IS THIS CORRECT?

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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Sat Jan 12, 2013 9:40 am 
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The dyno's can measure wheel kw and flywheel kw. You'll see when they do a power run, at some stage the computer will say apply clutch, but you don't apply brakes yet, at that stage while it's winding down it'll determine how much drag the drivetrain has and what the resulting loss is because of that. Then at some stage the dyno will say apply brakes at which stage it'll display the actual flywheel power.

You'll see when you look at a dyno sheet there's another 3rd line on the bottom that gradually slopes upwards towards the right of the sheet, that's the drivetrain drag, if you deduct that from the actual power at any given point you have the wheel kw.

That's why when they do a power run you'll see something like 110kw display just before it says apply clutch, but when the final kw is shown it's normally like 10 or 15kw higher than you saw during the run.

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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Sat Jan 12, 2013 12:37 pm 
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thanks boksie

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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Sat Jan 12, 2013 1:52 pm 
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Thanks Mr Boksie never knew about the lower line and suntractions. Very interesting

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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Sat Jan 12, 2013 1:59 pm 
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very helpful ne

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bmw X3 2.0 d ( on Wednesdays )
ex vw caddy 1.6 cam
ex NIssan 200sx
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ex130 mazda midge (daily drive)
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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Sun Jan 20, 2013 9:27 am 
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whens the next event for you phsyco?

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bmw X3 2.0 d ( on Wednesdays )
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ex NIssan 200sx
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ex130 mazda midge (daily drive)
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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Sun Jan 20, 2013 1:05 pm 
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Well popped the radiator, so need to sort that. Hoping febuary they have a proper event at tarlton. Then they'll have a proper track bite etc

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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Sun Jan 20, 2013 1:24 pm 
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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Sun Jan 20, 2013 2:08 pm 
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What event is that Mr Worx? Will check it out then! Have lots of work them

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 Post subject: Re: My first 1/4mile event with my 1.3 ever! *Pics added*
PostPosted: Thu Feb 14, 2013 9:54 am 
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