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Old 12-03-2004, 20:36   #1 (permalink)
Jim Mock You Rock
 
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Variance in Dynos????

Hi guys...today I went to a dyno day at Sydney and wanted to see what the JMM extractors and exhaust could give me in writing. I must say that the 2 other au falcons were an xr6 hp and JonBays Ghia.

The AU xr6 hp ran extractors and exhaust and ended up with 106 rwkws.

By comparison my wagon pulled 109rwks .The dyno was called mdx dyno.

JonBays dyno figure was also down his prior runs.I wont say what he ran unless he wishes to post it.

I estimate that the diiference is 20 rwkws less on this dyno compared to dynomatics....so I have to ask why is this so?
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Old 12-04-2004, 02:52   #2 (permalink)
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Re: Variance in Dynos????

I Heard A Few Stories About The Dyno Day Like A Someone Getting A Dyno A Week Before Hand Getting 190rwkws And Today Only Scoring 163rwkws I Think The Dyno Was Setup Wrong Or They Just Dont Know How To Use It. Fuzion Says The Dyno Is Setup To Get A "Constant" rwkws Reading Not A Peak Reading. All Sounds Fishy To Me!
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Old 12-04-2004, 15:44   #3 (permalink)
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Re: Variance in Dynos????

Yeh thats dyno's for you they all lie.

I now have 120-138 and 142 rwkw from the same car on three different dyno's.

Its pretty hopeless in this day and age you can't get a dyno to do a comparable measurement.

Still I have to be honest like everyone I like the better numbers, better graphs and so on from the dyno dynamics in shootout mode.

Anyway the point is comparing the cars on the day The AU XR6 with extractors ran 106rwkw and I ran 120. There were a lot of E series pulling mid to high 90's so in comparsion I was pretty happy.
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Old 12-04-2004, 16:16   #4 (permalink)
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Re: Variance in Dynos????

Perth Street Car mag did an interesting article with the same car and going to 5-6 different dynos. No result was the same.
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Old 12-04-2004, 16:35   #5 (permalink)
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Re: Variance in Dynos????

i pulled out my car at the dyno day on saturday in liverpool, i got 120 at the wheels.. i was expecting at least 130 which leads me to belive theres something fishy with these dynos
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Old 12-04-2004, 20:49   #6 (permalink)
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Re: Variance in Dynos????

How was the day ? Was Rollin's car there on the dyno ?
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Old 12-05-2004, 00:10   #7 (permalink)
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Re: Variance in Dynos????

why does everyone say there is something fish with the dyno? cant there be anything fish with your car???

anyway, i will reapeat myself one more time as i have many times before ,,,,

Dynos are tuning tools, not accurate measuring tools, too many factors play an important role determing the readout on the spot, anything from tyres, tyres pressure, tyre tempurature, air pressure, air density, humidity, etc, etc

the only possible way to get a constant and accurate reading is on an engine dyno with controled nevironmental conditions (see NIZPROs engine dyno, where air feed, cooling, intercooling, etc etc is computer controlled).

In addition, to run on a dyno day, it cam mostly be said that you can compare the figures with other cars run on the same day, as most environmental conditions are reasomably identical for all cars.

So please ppl dont kill yourself over powerfigures and be all disappointed if you run a figure way lower than promised or expected, by the end of the day it all comes down to how you can drive/race your car on the track or drag strip.

For your info, i have run a 139kW figure on a DynoDynamics and only days later 106kW on a Dynolog ... oh and my current best 1/4mile time is somewhere between 15.2 and 15.0 ... again go figure
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Old 12-05-2004, 01:04   #8 (permalink)
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Re: Variance in Dynos????

Evilchief I agree about the 400m being the true test and dyno being tuning tools all right.

My car hasn't changed since it ran 15.6 at WSID so whether the numbers 120-140rwkw it really doesn't kill me.

Its just the bragging rights I am missing.
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Old 12-05-2004, 13:10   #9 (permalink)
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Re: Variance in Dynos????

Heheh .The figures don't matter....it was a good comparison for the day,however we all like big numbers!!!
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Old 12-06-2004, 03:08   #10 (permalink)
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Re: Variance in Dynos????

I was there in the white Au fairmont and only got 114 and thats with the 168kw vct fitted with 2.5 catback and t-series intake spoke to a few guys at the Grand finale race and they said i should have 120 and yes at one stage it showed that but the the paper hasnt agreed
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