ZX5 on grass?
 

Hi All,

After winning a local race with a standard B4 I have again got the off-road bug.

My wallet is lighter but in return I now have a standard (not the RTR) ZX5 and a ZX5-FS on the way.

The track I run on is 100% grass so can anyone give me any tips to ensure it's/they're not a handful 1st time out? Which one should I run? The standard car or the FS?

Kinds of things I'm thinking of:

Should I use a front one way?
What springs front and rear and which manufacturers springs?
What tyres/inserts front/rear? Schumacher yellowsgreens? minipins or spikes?
What holes on the shock tower/wishbones?
What ride height?
What oil in shocks?
What to change if the grass is wet?

I am tempted to try the standard car first as I have LiPo's from my touring cars and the standard car takes stick/side by side packs whereas the FS needs saddle pack config si I'd need to resolder some NiMh packs.....

Thanks in advance!

Dan

Most definately run the FS. I wouldn't have bought the standard ZX5 in the first place TBH.


Use this setup http://www.petitrc.com/setup/kyosho/...PR20090621.pdf

as a starting point.

Then do the following changes :

Run lime green springs up front, 1.2mm x 3 holes pistons up front, 1.3mm x 3 holes pistons up rear.

Cut as many rows on the outside and inside of te front tyres as you need to make the car easier to drive.

Might also be worth trying 1.1 x 3 hole fronts and 1.2 x 3 hole rears ... I found FABs set up a little too soft / low pack to suit me.

I run a standard ZX5 on grass with the following set-up

Rear:
30wt oil
outside hole on mount, inside on wishbone
Silver springs
3B pistons
Camber: innner hole on gearbox & hub
LWB
Schu yellow minispikes
2deg toe in
2deg -ve camber

Front:
40wt oil
inside hole on mount, inside hole on wishbone
7 deg caster
max kick-up
3C pistons
Light green springs
Camber: inner hole on gearbox
Schu yellow minispikes w outer row cut off
1deg -ve camber
One-way on shaft

Found this works really well, never tried an FS but I'm not sure what all the fuss is about.

Thanks will try this

If you had of tried one you would know! The FS is a simply awesome machine, I loved the way the SP handled but the FS is something else!!!

Roll centre?
 

Ok guys race this Sunday - car ready to roll - thing is, I tried it in my back garden, admitedly the grass was slightly longer than the track I'll be running on Sunday but each time I turned in the car rolled.....how do I remedy this? Cut row off front yellow minispikes? Put spacers under my camber turnbuckles on car end to change roll centre?

As I said it has yellow minispikes front and rear, kyosho silver springs up front with 50wt oil, kyosho blue springs at rear with 45wt oil, running driveshafts level.

Thanks.

Dan

Cut rows, at least the outside row of the fronts, rears if necessary and any more you see fit (don't hesitate to cut inside rows).

The FS is still rolling over onto it's roof whenever I got into a turn at any kind of race speed.....my RC10B4 is a total contrast as I can turn at full speed and it doesnt get unsettled. I have cut the outer rows off the fronts and it didnt make any difference.

I am racing it for the 1st time at Batley next Sunday and would like it to stay on it's wheels arounbd the twisty stuff ;)

Any suggestions?

Yeah have you tried my latest setup ?

Hi Fabs,

Can you send a link? Is it on petitrc?

Cheers,

Dan

Yep it's on Petit RC. As a general thing and because we don't have many people running the car I tend to send my latest setup to Arn0 when I find an improvement. And with some help from Mick Cragg at Stotfold the car was the best it ever felt.

Ok back from Batley, what fun! :)

Car was a handful on the bumpy bits - she flew well over the big jumps but whenever there were several bumpy medium to high speed sections the back end would go crazy and the car would flip, it still suffered from traction roll too on tight grass corners but so did some other cars.....

I have Kyosho blue springs on rear and silvers on front, 3 hole pistons and 45wt oil in front and 40wt at rear - I cut 2 outer and 1 inner rows from my yellow minispikes at front.....how do I get it handling better over the bumps and not traction rolling when I steer on grass? Help!

Tried to copy your setup as closely as I could Fabs, any ideas?

Cheers,

Dan

Dan,

My setup is closer to 35 on the rear than 40, and I use re-drilled pistons with 1.2mm holes (1mm holes at the front).

I'd say you're too hard on the rear. If you cannot re-drill your pistons, I suggest trying 30.

DAN,
Did you cut any spikes off the rear tyres as i was running my fs at the same regional and had no such issues,although phil c did mention that he was having similar issues with grip roll.
cheers chris.

I did have probs early on chris but changed from ten degree caster blocks to seven and that made it a lot better !

Thanks guys I'll try some new settings on Sunday.

What front wheels fit the ZX5FS apart from Kyosho? They use a standard hex right as per touring cars (I'm not intending to use 24mm touring wheels dont worry!)?

wheels
 

hotbodies cyclone d4 fit mate

Ok cheers

Ran the car today on grass and it was fantastic!I got a lap more than my closest challenger and was the only one to get a sub 15 second lap time thanks to all of you for your help.

Dan