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My DIY wheel refurb
27-01-2011, 01:26 PM (This post was last modified: 27-01-2011 01:32 PM by moranor@axis.)
Post: #41
RE: My DIY wheel refurb
i count 20 per wheel am i missing something?
if there are 20 per wheel that's 640g total weight i dont know the proper calculation for how much weight that will effectively add you your car but some say you can X10 any rotational weight i think with wheels it could be even more because they have quite a large diameter...

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27-01-2011, 05:31 PM
Post: #42
RE: My DIY wheel refurb
In this case the moment of inertia can be approximated as the square of the radius at which the studs sit in meters times the weight in kg. (I = m.r^2)

The effect this will have:
if a torque a torque T is applied to a wheel with a moment of inertia I its acceleration will be given as a = T/I, thus if I is increased the acceleration of the wheel will be decrease, but this will not be noticeable due to the I of the studs being so much less than the I of the wheels.
This is of course if the wheel is hanging free, the effect will be further lessened by the fact that the road with with the tyre makes contact presents a far force to oppose the rotation of the wheel than the addition of the studs do.
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27-01-2011, 08:57 PM
Post: #43
RE: My DIY wheel refurb
ok so unless i got this completely wrong:

inertia in the wheel studs = 12.44 (if the wheels are 18")

now a light weight fly wheel from turner ms is about 5 kg ligher than the stock one...

the inertia lost on the fly wheel works out to 0.288

now the fly wheel is supposed to make alot of difference to performance so i think you will feel the difference unless im completely wrong Bluebiggrin

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27-01-2011, 11:03 PM
Post: #44
RE: My DIY wheel refurb
This thread took a wrong turn somewhere Bluebiggrin

We can order titanium fasteners from dpe... But it might just cost the same as a wheel

Since yours are plastic and just cosmetic, why dnt u have them recoat in chrome.
There's a place in brackenfell that "chromes" any plastic parts.
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28-01-2011, 07:05 AM (This post was last modified: 28-01-2011 07:07 AM by moranor@axis.)
Post: #45
RE: My DIY wheel refurb
my calculations were wrong Sad i used the diameter instead of the radius...

the extra inertia:

wheel nuts: 0.031
flywheel: 0.072

so taking the nuts off would be the same as reducing the flywheel by about 2kg

i agree with revo they just cosmetic so i would try get plastic ones...

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28-01-2011, 07:11 AM
Post: #46
RE: My DIY wheel refurb
(27-01-2011 05:31 PM)Sankekur Wrote:  In this case the moment of inertia can be approximated as the square of the radius at which the studs sit in meters times the weight in kg. (I = m.r^2)

The effect this will have:
if a torque a torque T is applied to a wheel with a moment of inertia I its acceleration will be given as a = T/I, thus if I is increased the acceleration of the wheel will be decrease, but this will not be noticeable due to the I of the studs being so much less than the I of the wheels.
This is of course if the wheel is hanging free, the effect will be further lessened by the fact that the road with with the tyre makes contact presents a far force to oppose the rotation of the wheel than the addition of the studs do.


(27-01-2011 08:57 PM)moranor Wrote:  ok so unless i got this completely wrong:

inertia in the wheel studs = 12.44 (if the wheels are 18")

now a light weight fly wheel from turner ms is about 5 kg ligher than the stock one...

the inertia lost on the fly wheel works out to 0.288

now the fly wheel is supposed to make alot of difference to performance so i think you will feel the difference unless im completely wrong Bluebiggrin


i understand absoultuly nothing that was just said here....

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28-01-2011, 07:23 AM
Post: #47
RE: My DIY wheel refurb
(28-01-2011 07:11 AM)DonovanPorter Wrote:  
(27-01-2011 05:31 PM)Sankekur Wrote:  In this case the moment of inertia can be approximated as the square of the radius at which the studs sit in meters times the weight in kg. (I = m.r^2)

The effect this will have:
if a torque a torque T is applied to a wheel with a moment of inertia I its acceleration will be given as a = T/I, thus if I is increased the acceleration of the wheel will be decrease, but this will not be noticeable due to the I of the studs being so much less than the I of the wheels.
This is of course if the wheel is hanging free, the effect will be further lessened by the fact that the road with with the tyre makes contact presents a far force to oppose the rotation of the wheel than the addition of the studs do.


(27-01-2011 08:57 PM)moranor Wrote:  ok so unless i got this completely wrong:

inertia in the wheel studs = 12.44 (if the wheels are 18")

now a light weight fly wheel from turner ms is about 5 kg ligher than the stock one...

the inertia lost on the fly wheel works out to 0.288

now the fly wheel is supposed to make alot of difference to performance so i think you will feel the difference unless im completely wrong Bluebiggrin


i understand absoultuly nothing that was just said here....

you dont have to understand if you can understand my last post just ignore the other rubbish Bluebiggrin

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28-01-2011, 07:38 AM
Post: #48
RE: My DIY wheel refurb
Thumbsup2

Current : 2001 VW VR6 Sharan
Current : 1985 1.8 VW Fox
Ex: 1999 E46 318i Pre-facelift
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You have the Dream & the desire of it for reason, Follow your heart & you cant go wrong
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28-01-2011, 07:41 AM
Post: #49
RE: My DIY wheel refurb
Just remember that the flywheel is bolted directly to the engine, where as the losses at the wheels will be overshadowed by drivetrain losses, reduction in the weight of the flywheel will have a much greater effect than stuff on the wheel. Of course for if performance is what you are after then lightening everything would be a good idea as it will all add in the end, to make the car completely undrivable on normal roads Bluebiggrin
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28-01-2011, 07:49 AM
Post: #50
RE: My DIY wheel refurb
not undrivable just hard to drive Bluebiggrin

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28-01-2011, 11:47 AM
Post: #51
RE: My DIY wheel refurb
(27-01-2011 11:03 PM)revo@Rennzport Wrote:  This thread took a wrong turn somewhere Bluebiggrin

We can order titanium fasteners from dpe... But it might just cost the same as a wheel

Since yours are plastic and just cosmetic, why dnt u have them recoat in chrome.
There's a place in brackenfell that "chromes" any plastic parts.

problem is more that 50% of the ones I have are usable.

actually, I have 39 of them that range from 80-95% "fresh"

I actually found a place that is getting them (fake plastic) from joberg, so I will be sorted eventually

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28-01-2011, 11:57 AM
Post: #52
RE: My DIY wheel refurb
Good
The studs do add a nice touch on the wheel
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28-01-2011, 07:10 PM
Post: #53
RE: My DIY wheel refurb
some better lighting

[Image: 100_0072.jpg]
[Image: 100_0073.jpg]
[Image: 100_0074.jpg]
[Image: 100_0075.jpg]

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28-01-2011, 07:23 PM
Post: #54
RE: My DIY wheel refurb
that is such an awesome colour and it will work well with the carbon accents on your car Drool

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28-01-2011, 10:19 PM
Post: #55
RE: My DIY wheel refurb
I hope there's a set of springs going on with these wheels Icon9
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29-01-2011, 09:50 AM
Post: #56
RE: My DIY wheel refurb
@Kabal

Great work on the rims Thumbsup2 Will we see the car at the next milkshake event?

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29-01-2011, 12:03 PM
Post: #57
RE: My DIY wheel refurb
(28-01-2011 10:19 PM)revo@Rennzport Wrote:  I hope there's a set of springs going on with these wheels Icon9

I think it is nessesary Bluebiggrin

pm me your best prices :P

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29-01-2011, 12:32 PM
Post: #58
RE: My DIY wheel refurb
U know it... The drop will pull it all together

Springs only are pretty cheap nowadays
Probably in the 2-3k range
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29-01-2011, 01:06 PM
Post: #59
RE: My DIY wheel refurb
(29-01-2011 12:32 PM)revo@Rennzport Wrote:  U know it... The drop will pull it all together

Springs only are pretty cheap nowadays
Probably in the 2-3k range

now just need to find a supplier/fitter Bluebiggrin

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29-01-2011, 01:35 PM
Post: #60
RE: My DIY wheel refurb
we no work weekends... so prices nxt week

and wait... u mean you arent gonna diy the fitment??
New_shocked


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