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Do your own dyno tests. You will be surprised at the loss in power. It's where the weight is located that is killing the power. A 20" wheel is going to have more weight toward the outside of the wheel than the 18" wheel given the same overall height and width of the rim/tire combo.
Now, if you were arguing a low profile 20" wheel and tire combo makes more power than a large 18" off road truck tire combo you would be correct.
I'm really surprised at many posts. Many ask questions and people share real world experience backed by physics and those same people asking the questions choose to ignore the answers. Not really sure what to say.
I would love to do my own dyno test, but I haven't got the time or facilities,
don't forget this is England and we are way behind the States for facilities
particularly for the public. I have only seen Thericker's dyno test mentioned
and although questions are asked about wheels and tyres, I never seen any
body mention power loss on wheel size. Just look on the answers from
members and they are mostly confused about this subject.
But at LAST you agree with me, the tyre is furthest from the hub, so if my
20 inch rims have a lightweight tyre, then a 18 inch wheel with a heavy tyre
provided they are both the same diameter should be no different.
You can't just say you will loose power if you change from 18 inch wheel to
a 20 inch wheel without putting in all the other factors . There are other
members who think like me, and I must admit once I get something in my
head it stays until I can fully understand it, the only hope is these losses are
minimal as a good friend at F1 told me.
S8
I don't understand why weight would be moved further from the hub as the diameter is the same. In fact the bit that is furthest from the hub is the tyre which on a 20" setup is lighter, so I would like to see the dyno numbers that compare the same diameter and same weight wheel and tyre as the physics reasoning makes no sence.
You my friend think the same way as me, changing wheels and tyres to a
bigger diameter will of course ruin the gearing, without knowing the weight
of tyres, and wheels you wont know. An identical diameter wheel and tyre
combo must be almost the same, especially weighing the same. On 18 wheels the tyre starts sooner than on a 20, if that's what losses you power
it can only be minimal.
S8
Do your own dyno tests. You will be surprised at the loss in power. It's where the weight is located that is killing the power. A 20" wheel is going to have more weight toward the outside of the wheel than the 18" wheel given the same overall height and width of the rim/tire combo.
Now, if you were arguing a low profile 20" wheel and tire combo makes more power than a large 18" off road truck tire combo you would be correct.
I'm really surprised at many posts. Many ask questions and people share real world experience backed by physics and those same people asking the questions choose to ignore the answers. Not really sure what to say.
BlownV8, what you are saying is what I am saying. Read your post, it says
the further the weight is from the hub the more power you loose. Sure
an 18 inch wheel is nearer the hub than a 20 inch wheel, but the weight
increases when you put the tyre on, they then become the same rolling
radius. I have no idea how much tyres weigh but I would think there could
be a difference, not a slick versus a tractor tyre, but some difference.
I am there for agreeing a smaller wheel and tyre could give better performance, but all things do not weigh the same. Everyone is getting hot
around the collar because " giant losses " were mentioned, and as you
say bhp is expensive and in a car like mine impossible to increase. Without
spending a fortune.
S8
Yes, in a naturally aspirated 63 40.rwhp is not easily made up. The power difference between an 18 wheel and tire setup vs a 20" wheel will be pretty big because the bulk of the weight of the 20" wheel/tire is way put toward the edge of the spinning mass whereas the 18 will be closer to the center in comparison. The total weight and revs per minute could be exactly the same but the 20" wheel/tire will still cost you some real power. Obviously, it will be a.percentage of.total power so the more power the car makes the more power it will zap.
Yes, in a naturally aspirated 63 40.rwhp is not easily made up. The power difference between an 18 wheel and tire setup vs a 20" wheel will be pretty big because the bulk of the weight of the 20" wheel/tire is way put toward the edge of the spinning mass whereas the 18 will be closer to the center in comparison. The total weight and revs per minute could be exactly the same but the 20" wheel/tire will still cost you some real power. Obviously, it will be a.percentage of.total power so the more power the car makes the more power it will zap.
here is info, about NA 63 engine,, if put good set of headers on this engine, my Dyno guy say it pick up 40 horsepower,, on that engine is huge difference from the compressor model. and very highly recommendable
we measured 523 europe hp, 98 octan, kleeman headers, no katalysators, Xpipe 180 mm weistec crank pulley, KN airfilter, extra intercooler ,stock muffler and resonators, before did anything to ECU,, but trottle response was very good before tuning with this setup
about bigger wheels,, some must have done a dyno , with stock and 20 inch.. any reports on that ?
my car was delivered with 19 inch from factory,, not shure if this is upgrade from 18 as earlier year models , or if they came with stock 19 inch in 2007.
but for shure ,i will go down to 19 when i get the chance.. bending wheels on bridge connections with 25 and 30 profile,i get tired off.. if someone knows what tires model ,brand that protect the wheel most , i would like get that info..
You car looks amazing. Not a fan or red but it really works on your car.
SLS color Le Mans Red,, but from standox ,, and topcoat cratchfree , probaly more deep than a sls that come out from factory, women love this color, old ladys even.. maybe something to do with close to nail color, or lipstick..
Amazing attension it get ,anywhere i go, people start filming ,go take photos, also posing with car , on the road, cars behind start video filming, oncoming trafic ,do not look forward when pass.. expect someone will rear end somone shortly
Antibes france port, sunligh came from right direction
Yes, in a naturally aspirated 63 40.rwhp is not easily made up. The power difference between an 18 wheel and tire setup vs a 20" wheel will be pretty big because the bulk of the weight of the 20" wheel/tire is way put toward the edge of the spinning mass whereas the 18 will be closer to the center in comparison. The total weight and revs per minute could be exactly the same but the 20" wheel/tire will still cost you some real power. Obviously, it will be a.percentage of.total power so the more power the car makes the more power it will zap.
Yes I agree, as I said it was the fact that Thericker said giant losses that
threw a spanner in the works. Now he is a member I respect and I took
on board what he said, I can't afford to loose a tiny bit of power let alone
40 whp, power is precious, because it's difficult to get, had it been a turbo
or supercharged car it would have not caused me to question it.
I believe what is being said I would just like to see a proper test comparing
an 18 to a 20 with the same tyres and rolling radius be compared on a dyno
I just want to see accurate differences. I am stuck on what wheels to buy
until someone can come up with some figures. Maybe 19 inch should be included as well.
S8
I had 21 on the back of my wide body 63, I must admit even with lowering
links it's back side was up in the air, so I now have 20's with 325 tyres on.
S8
SLS color Le Mans Red,, but from standox ,, and topcoat cratchfree , probaly more deep than a sls that come out from factory, women love this color, old ladys even.. maybe something to do with close to nail color, or lipstick..
Amazing attension it get ,anywhere i go, people start filming ,go take photos, also posing with car , on the road, cars behind start video filming, oncoming trafic ,do not look forward when pass.. expect someone will rear end somone shortly
Antibes france port, sunligh came from right direction
Parked by new Sl 63 AMG
car looks more raw when roof is on than off
Look at the shape of your car, looks great, and now look at the back of the
63 231, the 63 is shapeless and boring like a square slab, another reason
I got rid of mine.
S8
I had 21 on the back of my wide body 63, I must admit even with lowering
links it's back side was up in the air, so I now have 20's with 325 tyres on.
S8
hi, i dont use spacers, special build wheels by Nutek , this widebody kit is wider than all other widebody kits, is 203 cm wide over the back wheels, car is as wide as stock sl with mirrors out . here is spec for wheels-
Hello! When installing your widebody kit did you guys have to replace or remove the windshield washer tank? I am having problems getting mine to fit under the fender
Hello! When installing your widebody kit did you guys have to replace or remove the windshield washer tank? I am having problems getting mine to fit under the fender
Hello! When installing your widebody kit did you guys have to replace or remove the windshield washer tank? I am having problems getting mine to fit under the fender
06-17-2015, 02:32 PM
