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Old 01-07-2010, 04:03 AM   #18166
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Default Roll centers

Hey everyone

I was wondering if something could explain the handling characteristics of raising and lowering the shims under the wishbone blocks. I run on very high grip carpet and am trying to take some of that grip away using roll centers.

Can anyone help?
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Old 01-07-2010, 07:09 AM   #18167
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with spacer under pivot block, tires work much more.
And center of gravity is lower.
is a compromise that you have to find, but usually if you use foam tires uses only 0.5 mm
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Old 01-07-2010, 08:48 AM   #18168
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Thanks guys.

The PPD EZ-Lipo plate looks good, but they are out of stock.

Tried searching for TOP + LiPo but nothing really useful came up, is TOP a company a abbreviation?

The 3racing chassis looks interesting, thing is i use stick packs so the edges are rounded off, so those plastic tabs wouldn't be much use unfortunately.

My Pro4 is pretty much the same chassis except with shaft drive, the Pro4 has 2 brackets and a battery clamp.
Was nothing like this ever offered for the Cyclone?



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Old 01-07-2010, 08:51 AM   #18169
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gixer, the T.O.P.'s part#:

Brace: TC-PMNS01
Weights: PO-PBW101
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Old 01-07-2010, 09:15 AM   #18170
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Quote:
Originally Posted by san. View Post
gixer, the T.O.P.'s part#:

Brace: TC-PMNS01
Weights: PO-PBW101
Great thank you.


Looking at the pics it seems that the TOP system still needs to to secure the battery.
It's difficult to see 100% from the pics, but is this system a battery clamp or more towards providing a secure weight solution?



Cheers
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Old 01-07-2010, 09:34 AM   #18171
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It's a battery brace (secures side to side movement) and weight system. You still need to tape the battery down.
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Old 01-07-2010, 10:25 AM   #18172
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Default traction roll

Hey,

Im having trouble with grippy tyres that are causing traction roll.
Appart from glueing the edge of the front tyre what changes could i make to solve this, for example shock position, roll centers, droop, camber etc?
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Old 01-07-2010, 11:35 AM   #18173
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use less compund on your front tires, try that one first.
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Old 01-07-2010, 12:10 PM   #18174
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Quote:
Originally Posted by gixer View Post
Great thank you.


Looking at the pics it seems that the TOP system still needs to to secure the battery.
It's difficult to see 100% from the pics, but is this system a battery clamp or more towards providing a secure weight solution?



Cheers
Mark

I put a new picture where I hope it is clearer fitting supports TOP.

http://yfrog.com/dzimmag047uj

Memory that must be practiced three new holes for fixing.

I hope I have been of help.
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Old 01-07-2010, 12:33 PM   #18175
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Quote:
Originally Posted by Matt W View Post
Hey everyone

I was wondering if something could explain the handling characteristics of raising and lowering the shims under the wishbone blocks. I run on very high grip carpet and am trying to take some of that grip away using roll centers.

Can anyone help?
Generally on our car, when you add shims under the suspension blocks it raises the roll center. This will give more initial grip, but less through the rest of the corner.

When you take shims out, it lowers the roll center. This makes the car feel very smooth initially, but it will have more grip through the middle and exit of the corner.

-Korey
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Old 01-07-2010, 12:37 PM   #18176
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Quote:
Originally Posted by Matt W View Post
Hey,

Im having trouble with grippy tyres that are causing traction roll.
Appart from glueing the edge of the front tyre what changes could i make to solve this, for example shock position, roll centers, droop, camber etc?
Well, this can be very hard sometimes. It can be a little easier to pinpoint the problem if you can describe what is happening to the car in more detail.

If you notice the front inside wheel is lifting in the corner, I would try and stiffen up the rear a bit, or stand up the rear shock. If the rear inside tire is lifting, I would stiffen the front of soften the rear a bit. That will make the roll of the car more balanced front to rear.

If the front and rear inside tires seem to lift at the same time, maybe try thicker shock oil in the front, and more shims under the camber links all around. Those have always seemed to help me smooth out the car in general and take away a little grip on carpet.

-Korey
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Old 01-07-2010, 12:48 PM   #18177
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Hi guys Im new to the cyclone and am looking at several setups. Im confused about the roll center and squat settings. Im trying out Barry Bakers setup and it says use 1.5 mm shims under the suspension toe-blocks. Does that mean I keep the stock 2mm shims under the pivot blocks also? Or is it 1.5mm all around.
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Old 01-07-2010, 01:00 PM   #18178
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Thank you for all your help guys.

Unfortunately i don't think any will work with the current stick packs i'm using as:
1/ They are fairly thick (high)
2/ The edges are rounded.

I do have some LiPo's on the way though, so once these arrive i will see if any of the solutions offered work better with those.


I find it strange though the HB offer no stick pack securing solution as standard.
Every event i've entered so far has had a restriction either on using NiMh batteries or a certain brand of batteries, as it's extremely difficult to find side by sie battery configurations these days i'd have thought a stick pack securing solution would be standard.


I suppose another alternative would be to split my current stick packs and resolder/configure them as side by side packs.
Problem then is they won't fit in all my cars.

Again though thank you to everyone for their suggestions, even if they didn't help much with the stick packs hey might well be a great solution for the LiPo's.

If anyone else is using stick packs though, it'd be great to hear how you solved the mounting solution.



Cheers
Mark
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Old 01-07-2010, 01:19 PM   #18179
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Agno, whoa...that's a huge pinion. Your FDR must be around 4.1-4.5...
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Old 01-07-2010, 01:20 PM   #18180
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Quote:
Originally Posted by goots View Post
Hi guys Im new to the cyclone and am looking at several setups. Im confused about the roll center and squat settings. Im trying out Barry Bakers setup and it says use 1.5 mm shims under the suspension toe-blocks. Does that mean I keep the stock 2mm shims under the pivot blocks also? Or is it 1.5mm all around.
1.5mm all around. You will typically use between 1.0 - 1.5mm all the time when using rubber tires.
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