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Post by chris burgess on Nov 23, 2005 12:41:25 GMT
been looking through some of the piccies of Paul Robinsons P8 on oople. Noticed in one of the pictures that he was running narrow front wheels. Presumably, these were cut down front wheels.
Does anybody know what the thinking behind this is?
I presume it's to reduce steering or is there another reason that this would be done?
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yardy
New Member
Posts: 41
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Post by yardy on Nov 23, 2005 17:24:35 GMT
Those are slim front tyres (2wd fronts) stretched over standard front rims. The reason this is done is because the shape of a slim tyre gives a different tread pattern to a standard 4wd front schumacher spike and also the tyre walls are much stiffer as they are narrower so you don't get any tyre "flex" whilst cornering and the foorprint of the front tyre is narrower, all in all reducing front end grip (at least that's how its always felt to me when I've tried it).
I don't recommend it unless you prefer understeer!
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Post by Cooper on Nov 23, 2005 17:32:06 GMT
I asked it at the euro's and they always use 2wd tires on the front (his dad did the explaining), because 4wd's give to much steering, I also use 2wd's on the front on my astroturf hometrack.
I think it was only at tiverton where they used normal front tires.
The P8 has just ALOT of steering and that is why they did it....
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Post by chris burgess on Nov 24, 2005 13:39:03 GMT
Those are slim front tyres (2wd fronts) stretched over standard front rims. The reason this is done is because the shape of a slim tyre gives a different tread pattern to a standard 4wd front schumacher spike and also the tyre walls are much stiffer as they are narrower so you don't get any tyre "flex" whilst cornering and the foorprint of the front tyre is narrower, all in all reducing front end grip (at least that's how its always felt to me when I've tried it). I don't recommend it unless you prefer understeer! But would you not get the same effect using cut down front wheels as opposed to stretching narrow tyres over a wider rim? I would have thought that stretching the tyres over a wide rim only increases the chance of the tyre coming off the rim during a race, due to the rubber trying to get back to shape, eventhough it is glued to the rim? I'll give it a try on Sunday and report back! |
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Post by John Reid on Dec 23, 2005 17:03:17 GMT
been looking through some of the piccies of Paul Robinsons P8 on oople. Noticed in one of the pictures that he was running narrow front wheels. Presumably, these were cut down front wheels. Does anybody know what the thinking behind this is? I presume it's to reduce steering or is there another reason that this would be done? I have ran the car on wet grass with narrowed down front wheels fitted to the front end and standard width front wheels fitted to the rear end. The track (STONEHAVEN) was wet and the grass was a bit on the long side. The reduction in rolling resitance was significant. I had my highest qualifying position (A final6th) that year (circa 1997) with this set up. |
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Post by chris burgess on Dec 23, 2005 17:59:02 GMT
I like the narrow tyres on the front alot, it gives me plenty of steering on the carpet, but it does have a tendancy towards power on understeer, which can be cured with a little work.
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Post by Northy on Jan 10, 2006 22:12:57 GMT
I was going to try this with some slim Yellow mini pins, but felt that they sat better on full width rims.
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Post by Cooper on Jan 10, 2006 22:15:40 GMT
I was going to try this with some slim Yellow mini pins, but felt that they sat better on full width rims. not to much steering ? |
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Post by Northy on Jan 10, 2006 22:18:18 GMT
Never actually ran them in the end, ran spikes instead. I can't see that the wheel width would make much if any difference, the pins are still presented to the track in the same way.
May be different with slim mini spikes, I'll have to try.
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Post by Cooper on Jan 10, 2006 22:20:38 GMT
 these are slim mini pin's on normal front rims, still had to much steering but the X10 has less steering than a P8 I think  my next try is slim mini spikes stretched and on cut wheels |
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Post by Northy on Jan 10, 2006 22:24:32 GMT
Yeah, they look fine, just like the ones I mounted.
X10 doesn't have less steering when set up right Coop! ;D
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Post by Cooper on Jan 10, 2006 22:27:17 GMT
X10 doesn't have less steering when set up right Coop! ;D so it's just paul robinson that likes to run it understeered and runs slims all the time.... and accidentally I have plenty of steer on my hometrack.... (like everyone and everycar lol) |
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Post by Northy on Jan 10, 2006 22:37:26 GMT
Yeah.
On your track I'd probably run:
Copper springs all round.
30wt in the front.
45wt in the back.
Front anti roll bar (red or copper - NOT purple)
I also might try minimum front caster (washers at the back of the top front wishbones).
Also add washers the the drive shafts (between bearing and drive disk) until it just fits in the box.
Try that Coop, sorry I promised you this last week! ;D
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Post by Cooper on Jan 10, 2006 23:17:53 GMT
I only have 1set of copper lol but I'll try yours and Richards and mix them till I find the correct one elvo will help me ( users.pandora.be/elvo) |
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