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Author Topic: JKM Rolling Road June 18th  (Read 84960 times)

Saint Steve

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Re: JKM Rolling Road June 18th
« Reply #480 on: June 19, 2011, 08:46:19 pm »
just a thought, all the cars that claim to have run accurately, were new cars??

Would having lower tread on the front wheels cause differences in RR readings??

If all models of cars were strapped down the same, yet the newer cars ran nearer to their Pre claimed bhp..

Anyone with a a mk5 GTi running new tyres and what bhp did you get yesterday? Maybe tyres not gripping aswell.

I know Jim commented on my vreddestein tyres not getting enough heat in them causing issues on my 1st few runs before.



« Last Edit: June 19, 2011, 08:50:06 pm by Saint Steve »
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Offline bacillus

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Re: JKM Rolling Road June 18th
« Reply #481 on: June 19, 2011, 08:46:59 pm »
Quote from: E30Dom on June 19, 2011, 08:44:19 pm
His issue was down to dsg, the power was similar before and after...

Ahh, ok! Was just hypothesising why the discrepencies may have occured.
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Offline bacillus

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Re: JKM Rolling Road June 18th
« Reply #482 on: June 19, 2011, 08:50:16 pm »
Quote from: Saint Steve on June 19, 2011, 08:46:19 pm
just a thought, all the cars that claim to have run accurately, were new cars??

Would having lower tread on the front wheels cause differences in RR readings??

If all models of cars were strapped down the same, yet the newer cars ran nearer to their Pre claimed bhp..

As long as there was no wheel slippage on the dyno then variation in thread depth would make no difference.
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Saint Steve

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Re: JKM Rolling Road June 18th
« Reply #483 on: June 19, 2011, 08:51:58 pm »
but would tyres not being up to temperature cause an issue Bacillus?
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Offline Creatz

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Re: JKM Rolling Road June 18th
« Reply #484 on: June 19, 2011, 08:59:46 pm »
I'm sure JKM would love to comment on all of this but i hear there busy modifying a yeti





 
:signLOL:

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Saint Steve

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Re: JKM Rolling Road June 18th
« Reply #485 on: June 19, 2011, 09:01:45 pm »
I want a yeti  :sad1:
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Offline Jussa

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Re: JKM Rolling Road June 18th
« Reply #486 on: June 19, 2011, 09:03:46 pm »
I think the F*&%kin Yeti ate all my Horses  :confused:
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Offline Creatz

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Re: JKM Rolling Road June 18th
« Reply #487 on: June 19, 2011, 09:07:28 pm »
Quote from: Jussa on June 19, 2011, 09:03:46 pm
I think the F*&%kin Yeti ate all my Horses  :confused:

:signLOL: :signLOL: bring the shotgun next time
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Offline Jussa

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Re: JKM Rolling Road June 18th
« Reply #488 on: June 19, 2011, 09:08:13 pm »
 :signLOL:  :signLOL:
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Offline bacillus

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Re: JKM Rolling Road June 18th
« Reply #489 on: June 19, 2011, 09:08:23 pm »
Quote from: Saint Steve on June 19, 2011, 08:51:58 pm
but would tyres not being up to temperature cause an issue Bacillus?

If the tyres weren't up to temp then they will have a slightly lower pressure. This should only have a minor effect when the dyno is trying to calculate the coast down losses to convert wheel hp to crank hp.

The above again assumes that no tyre slippage has occured on the dyno.
« Last Edit: June 19, 2011, 09:11:39 pm by bacillus »
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Offline Jussa

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Re: JKM Rolling Road June 18th
« Reply #490 on: June 19, 2011, 09:09:43 pm »
Well my tyres are not new..... :sad1:
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Offline alackofspeed

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Re: JKM Rolling Road June 18th
« Reply #491 on: June 19, 2011, 09:36:51 pm »
Quote from: bacillus on June 19, 2011, 09:08:23 pm
Quote from: Saint Steve on June 19, 2011, 08:51:58 pm
but would tyres not being up to temperature cause an issue Bacillus?

If the tyres weren't up to temp then they will have a slightly lower pressure. This should only have a minor effect when the dyno is trying to calculate the coast down losses to convert wheel hp to crank hp.

The above again assumes that no tyre slippage has occured on the dyno.

The dyno dynamics RR works on a default loss calc, there is no run down loss check. I enquired of JKM after everyone had gone, as I was curious to understand how they work out the losses on a DSG, which to my knowledge isn't meant to be turned at high speed in neutral.
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Offline RedRobin

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Re: JKM Rolling Road June 18th
« Reply #492 on: June 19, 2011, 09:39:35 pm »
Quote from: E30Dom on June 19, 2011, 08:44:19 pm

His issue was down to dsg, the power was similar before and after...


....That's right - DSG and kickdown. Found not to be an issue but JKM wanted to be sure what was happening.  :happy2:
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Offline RedRobin

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Re: JKM Rolling Road June 18th
« Reply #493 on: June 19, 2011, 09:41:17 pm »
Quote from: Jussa on June 19, 2011, 09:09:43 pm

Well my tyres are not new..... :sad1:


....Me too - I need new fronts. I check my pressures very regularly though.
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Offline Hedge

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Re: JKM Rolling Road June 18th
« Reply #494 on: June 19, 2011, 09:50:31 pm »
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