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Roche Rapide P12 1/12 Competition Car Kit

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Old 02-12-2018, 01:13 PM
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Originally Posted by Josh-n-ya View Post
Were you guys on spec tires?
Yes CRC Spec
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Old 02-12-2018, 02:51 PM
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[QUOTE=gijoe64;15156316]Yes CRC Spec[/QUOTE

Do you think this would work on grey carpet considering you were on high grip black carpet. I get the feeling that it loosened up the car for quicker rotation maybe?
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Old 02-12-2018, 06:31 PM
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[QUOTE=Josh-n-ya;15156407]
Originally Posted by gijoe64 View Post
Yes CRC Spec[/QUOTE

Do you think this would work on grey carpet considering you were on high grip black carpet. I get the feeling that it loosened up the car for quicker rotation maybe?
To be honest, I don't know it is a easy mod so I would his try it out and see.
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Old 02-12-2018, 08:57 PM
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Would be easy enough to try by just removing belleville washers from diff and cranking down on nut.
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Old 02-12-2018, 08:58 PM
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Also anyone know where I can get a CF 2016 chassis?
Roche / Rocheusa are sold out.
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Old 02-13-2018, 06:21 AM
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I am pretty sure I have some CF chassis' extra at home. Once I get home from work I can check and will pm you if I do.
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Old 02-13-2018, 09:26 AM
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Originally Posted by GimpyGolden View Post
Would be easy enough to try by just removing belleville washers from diff and cranking down on nut.
This wount work the diff will still slip you need to bily it down.
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Old 02-13-2018, 01:05 PM
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I would guess that pinning the diff allows the outside wheel to drive in the corner when the inside is unloaded. Thus giving the feeling of more on power steering. I guess that less slipping is improving drive and thus lap times.

Usually a solid rear axle results in less steering as the inside tire tries to drive the car straight. With most tracks having tighter 180 deg turns vs long sweeping turns I can see how better drive through and off the corners is more important than an efficient car in the corner.
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Old 02-13-2018, 09:20 PM
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[QUOTE=gijoe64;15156612]
Originally Posted by Josh-n-ya View Post
To be honest, I don't know it is a easy mod so I would his try it out and see.
I made a spare diff to try. What was your front tow?
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Old 02-13-2018, 09:53 PM
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Originally Posted by slotracer577 View Post
I would guess that pinning the diff allows the outside wheel to drive in the corner when the inside is unloaded. Thus giving the feeling of more on power steering. I guess that less slipping is improving drive and thus lap times.

Usually a solid rear axle results in less steering as the inside tire tries to drive the car straight. With most tracks having tighter 180 deg turns vs long sweeping turns I can see how better drive through and off the corners is more important than an efficient car in the corner.

talking to a old timer, original pan cars 1/12 and 1/8 had no diffs. for the tires at the time and tracks the cars either pushed which was more ideal than the other negative it caused spinning out. usually the later if traction was poor. cars ran rear pod mount wings to get and maintain rear traction even on carpet racing early days.

late 70's Schumacher invented the ball diff and instantly others followed. initially ball diffs were used primarily as slippers, more than for their diffing action. this also carried into 80's like RC10 offroad and early 90's until buggies got actual slippers and diffs were set not to slip or less.

gear diffs were tried in late 80s on 1/12, but under power, acceleration they often had the same characteristics as a straight axle and were unforgiving compared to ball diffs even on prepped asphalt.

today's tire tech, car designs, very high grip, and latest carpets ball diffs may not be needed, and to keep RM down neither a gear diff
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Old 02-14-2018, 02:54 AM
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8th onroad still runs solid rear and 1 way in the front. The rotation is helped by setting the car up to lift the inside rear. With ultra high grip, that’s probably what the 12th scale is doing as well with a locked rear.
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Old 02-14-2018, 05:57 AM
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[QUOTE=Josh-n-ya;15157700]
Originally Posted by gijoe64 View Post

I made a spare diff to try. What was your front tow?
0 deg
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Old 02-15-2018, 04:51 AM
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Besids Roche Usa. Who else is carring parts for P12 like the axle height adjusters?
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Old 02-15-2018, 05:16 AM
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Originally Posted by Duck999s View Post
Besids Roche Usa. Who else is carring parts for P12 like the axle height adjusters?
No idea.. Mike has always done a fantastic job of having inventory and shipping orders fast. Never had a reason to look anywhere else
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Old 02-15-2018, 05:30 AM
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Originally Posted by Racermac73 View Post
No idea.. Mike has always done a fantastic job of having inventory and shipping orders fast. Never had a reason to look anywhere else
You are right he does a great job just looking for a couple parts he is out of for next weekend race
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