Ima-Racing500

Been meaning to post this for a while....

On going from 16in wheels to 18in wheels i have noticed the car is not as fast accelerating..i can understand why,BUT the difference is a bit beyond belief!!!!

I look it like this:- (Please if your Deano or Pon or Rainbird please change the female to a male )

If i put my 10 inch cock in a female and thrust i have further to travel so my strokes are longer and slower than say Rainbird with his 4 inch*cock...who would out accelerate me by a lot....a bit like a rabbit mating as both have similar tackle (*Pon give me all measurments and info regarding Mike)

My point is this..i have only gone up 2 inches on wheel size and what a difference......Mikes is 6 inches smaller and i shudder to think the poor blokes arse after a night with him!!!!!

foreigneRS

the point is not how much wheel size difference you've got, but the difference in radius or diameter including the tyre profile. what tyre size did you have / have now?

if it makes such a big difference to your acceleration, you know what that means? that you don't have enough power

Mike Rainbird

iTrader: (3)

As FRS states, it has almost nothing to do with the size of your wheels, but the rolling radius of your tyre. You can increase your wheel size by 2" no problem, but keep the rolling radius (thus acceleration) the same, by putting the correct sized tyres on to achieve this . Perhaps if you actually knew anything about anything, you would realise this, but sadly you know about as much as a 12 year old trainee nun compared to a 90 year old hooker (i.e. your mumma ).

Ima-Racing500

It had 225/50/16s all round on.

It now has 235/40/18 on the front and 265/35/18 on the rear (This is the correct rolling radius for the front/rear combo)

Come on then brain boxes (Excluding Mike ) should i notice a difference?

brad

i wouldnt have thought it would make THAT much difference bud !!
the only thing that could have had the effect would be the width of the tyre's

foreigneRS

how do you work that out? extra drag?

Ima-Racing500

If you put the wheel against the OG rim with tyres on...the 18 is bigger circumerance...so should in theory make the car accelerate slower but have a higher top speed at a guess...just shocked by the difference!

foreigneRS

no you shouldn't. you've only increased the rolling radius by 2% so you shouldn't notice a big difference.

i don't know if the slight dfference between front and back causes a little extra drag in the centre diff or anything?

another reason could be that those wheels/tyres have a higher inertia (it takes more power to get them spinning at speed) because the bigger diameter puts the weight of the tyres further out. like the effect of putting on a heavier flywheel. but i wouldn't have thought that you would notice it.

or is it cos one of them is buckled to fuck?

brad

seeing as your obviosly into bikes . You should know what difference a larger footprint makes you lord

Ima-Racing500

Buckled If it wasnt fixed dont you think i'd notice they were out of balance?

foreigneRS

notice the '?' ima?

obviously i'm a thick lord cos i don't get it. you'll have to explain it to me, meister.

brad

larger footprint =more grip which means it needs more power to get it to spin which in turn makes it seem like its lost power .

i dont see this being the problem tho ima .
i,d go with the rolling radius issue
how much bigger are they when standing side by side ?

buzznwood

You've put much wider tyres on so your contact patch has changed. In simple terms if you think of the contact patch as ratio of a width n height (looking top down on a tyre) if you increase the width of the tyre then the width of the contact patch increase however as this increases it takes it away from the height. If you reduce the width of the tyre then it increases the height of the tyre.

For straight line accelerating / braking the more height you have the better, where as for cornering the more width you have the better. Compared to your old tyres you should be able to turn in better and put the power down earlier while cornering.

brad

fook me thats wot i was gna say

Stavros

IMA, simple answer is you not got enough power, your driving an almost std car, few mods and somthing like bigger rims wont slow the fooker down