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WILL 20'S AFFECT MY DYNO READING 

 

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 Post subject: WILL 20'S AFFECT MY DYNO READING
Posted: Sun Feb 10, 2008 10:08 am 
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just wondering if the 20's on my AU will change my read out on the dyno and will it go up or down?

 

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Posted: Sun Feb 10, 2008 10:27 am 
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yeah im keen on seeing if a few variables like that affect the reading.

this might sound stupid but, what about removing the spare tyre and reducing weight for the dyno? If it gains accelaration on the street, then you would think it would work on the dyno?

Some one wanna clarify how it works?
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Posted: Sun Feb 10, 2008 10:43 am 
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imo your power @ wheels will go down slightly as your car is turning a larger wheel. will be down only by a few kw though.

more extreme way of telling is with 4wd's run 31's n u have lots of power, change to 37's n ur car suddenly cant pull them!

 

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Posted: Sun Feb 10, 2008 12:27 pm 
Getting Side Ways
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we shall see next weekend then at the dyno day ill post after that what it made

 

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86 ZL mint grandpa spec with premo sound and 150000km
07 TTG 60000km stock as, mods to come.
97 el futura about to be MOCKed

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Posted: Sun Feb 10, 2008 2:34 pm 
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ebxr82nv wrote:
just wondering if the 20's on my AU will change my read out on the dyno and will it go up or down?


it shouldnt affect it much... some people reckon it does and people reckon it doesnt...
you would get more variation in power output by different weather conditions compared to the last time it was on the rollers..

FordFairmont wrote:
yeah im keen on seeing if a few variables like that affect the reading.

this might sound stupid but, what about removing the spare tyre and reducing weight for the dyno? If it gains accelaration on the street, then you would think it would work on the dyno?

Some one wanna clarify how it works?


removing spare tyre wont increase power output...
it may improve acceleration due to it being lighter, that would increase your power:weight ratio, not power output.. although the weight of the spare wheel compared to the whole car wont make much difference...

cooki_monsta wrote:
imo your power @ wheels will go down slightly as your car is turning a larger wheel. will be down only by a few kw though.


i had a mate in a BA XR6T who had 305rwkw with his 17s, people were telling him with his new 19s he would have less power, so he took it to his tuner and dynoed it with the 19s on there and it made 305rwkw again..
it could depend on the weight of the actual wheel if it heavier or lighter than the standard items.
imo i dont believe it will change it much, a few kw would be all...

ebxr82nv wrote:
we shall see next weekend then at the dyno day ill post after that what it made

is it going on the same dyno as it did for the reading u r comparing it to??
remember that different abient temp and things like that can affect the power output on the day...

sorry for the long post.
i am interested to see your results ebxr82nv.

cheers.

 

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Posted: Sun Feb 10, 2008 2:50 pm 
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changing wheel size will be similar to changing your diff ratio.

i guess thats the same question as does your diff ratio affect the rwkw??
thats something im also curious about??????
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Posted: Sun Feb 10, 2008 4:18 pm 
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no it will be a different dyno.

the 136kw run was done on a day with an air temp of 45 in the shed

 

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9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track.
86 ZL mint grandpa spec with premo sound and 150000km
07 TTG 60000km stock as, mods to come.
97 el futura about to be MOCKed

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Posted: Mon Feb 11, 2008 2:50 am 
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the only effect changing wheels will have power wise would be a tiny drop if the wheels are effectivly harder to turn because they are heavier or something

if they are only bigger it wont affect your power output, same with different diff gears or the popular myth of running your car in a lower gear for more power

the power at the rears will always be the same


however tractive effort will change, this is the force in newtons that the wheels are putting onto the rollers.

imagine taking off in top gear, it would be slow as hell right, thats because tractive effort would be low, so when u have larger wheels or change anything that effects your lever arm or mechanical advantage will change the tractive effort

really wont mean anything unless your using the tractive effort to find your rwnm


so in summary power output will only be affected because your wheel may be heavier etc, if the wheels lighter it may actuall give u more power,
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Posted: Mon Feb 11, 2008 6:12 pm 
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according to my physics teacher the torque curve will drop but the peak kw number should slightly increase

 

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Posted: Mon Feb 11, 2008 7:05 pm 
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4dlvr wrote:
according to my physics teacher the torque curve will drop but the peak kw number should slightly increase
lets hope thats right as ive now 20's and up for my 1st dyno comp with them installed this weekend coming... :twisted:

 

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Posted: Mon Feb 11, 2008 7:10 pm 
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fordfreak ef wrote:
lets hope thats right as ive now 20's and up for my 1st dyno comp with them installed this weekend coming... :twisted:


i would fit some stockies on for the comp.

Theres prolly around 10 kg difference in weight between your 20" rims/tyres and a stockie with 195's

and would affect intertia you would think
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Posted: Mon Feb 11, 2008 7:13 pm 
Getting Side Ways
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ill say something we already no.
the torque curve matters much then more then peak power in a drag race.
so even though the higher number will make you think you've got the bigger d**k the better torque curve will prove you've got the bigger balls

 

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Garrett gt40turbo, iceman plenum, ported head, turbo cam, double valvesprings, 023 fuel pump, 36lb injectors 4' cat, 4' dump, 2.5 exhaust, build bottom end, hypertonic pistons rods & rods, king bearings, j3. c10 3500 stall
232rwkw@4psi

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Posted: Tue Feb 12, 2008 8:59 am 
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FordFairmont wrote:
fordfreak ef wrote:
lets hope thats right as ive now 20's and up for my 1st dyno comp with them installed this weekend coming... :twisted:


i would fit some stockies on for the comp.

Theres prolly around 10 kg difference in weight between your 20" rims/tyres and a stockie with 195's

and would affect intertia you would think


Ahh weres the fun in that !

 

_________________

9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track.
86 ZL mint grandpa spec with premo sound and 150000km
07 TTG 60000km stock as, mods to come.
97 el futura about to be MOCKed

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Posted: Tue Feb 12, 2008 9:11 am 
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FordFairmont wrote:
fordfreak ef wrote:
lets hope thats right as ive now 20's and up for my 1st dyno comp with them installed this weekend coming... :twisted:


i would fit some stockies on for the comp.

Theres prolly around 10 kg difference in weight between your 20" rims/tyres and a stockie with 195's

and would affect intertia you would think
but makes you look like another try hard commo wanker... so i will be turning up to the comp on full 20's.. but MAY chanfe to a set of low profile 14s ive had in starage for ages.. kinda cheating though considering i never drive on 14's so in effect wouldnt thAT also be trying to "make ur d**k look bigger"??

 

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Posted: Tue Feb 12, 2008 9:50 am 
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i personally would use the multi-directional wheels from a shopping trolley for the 'edge' in the dyno comp
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