|
| ebxr82nv |
|
||
|
just wondering if the 20's on my AU will change my read out on the dyno and will it go up or down?
_________________ 9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track. |
||
| Top | |
||
| FordFairmont |
|
||
Posts: 6113 Joined: 8th May 2007 |
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? |
||
| Top | |
||
| cooki_monsta |
|
|||
|
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!
_________________ Mods: sprint kit, steeda short shift, svo lip, El handles, El Air intake, au xr wheels, lukey cat back, jbl focal and pioneer sterio <--- Sold |
|||
| Top | |
|||
| ebxr82nv |
|
||
|
we shall see next weekend then at the dyno day ill post after that what it made
_________________ 9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track. |
||
| Top | |
||
| Mr Man |
|
|||
|
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.
_________________ 300+rwkw HeadsexTuned XR6 Turbo Ute *NOW SOLD |
|||
| Top | |
|||
| TROYMAN |
|
||
|
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?????? |
||
| Top | |
||
| ebxr82nv |
|
||
|
no it will be a different dyno.
the 136kw run was done on a day with an air temp of 45 in the shed
_________________ 9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track. |
||
| Top | |
||
| BigCav |
|
||
|
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, |
||
| Top | |
||
| 4dlvr |
|
||
|
according to my physics teacher the torque curve will drop but the peak kw number should slightly increase
_________________ 96 EF FAIRMONT |
||
| Top | |
||
| fordfreak ef |
|
|||
|
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... 
|
|||
| Top | |
|||
| FordFairmont |
|
||
Posts: 6113 Joined: 8th May 2007 |
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...
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 |
||
| Top | |
||
| 4dlvr |
|
||
|
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
_________________ 96 EF FAIRMONT |
||
| Top | |
||
| ebxr82nv |
|
||
|
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... 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. |
||
| Top | |
||
| fordfreak ef |
|
|||
|
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... 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 |
|||
| Top | |
|||
| FordFairmont |
|
||
Posts: 6113 Joined: 8th May 2007 |
i personally would use the multi-directional wheels from a shopping trolley for the 'edge' in the dyno comp
|
||
| Top | |
||
| Who is online |
|---|
Users browsing this forum: No registered users and 33 guests |
*