Please help my solve a strange behaviour on my new Cyclone

[tino_ale]

Hi,
I'm having great trouble with my brand new Cyclone WCE. It's easy to describe though : when I brake, the rear weels go in front and the car immediately turn around, 180°. It does that at higher speed (not that high though) and even when I apply the slightest brake level I can. At low speed, I can brake, but the ar really has to be really slow. This reaction is immediate when I brake, and I can't control it at all. It always turns to the same side, but if I slightly turn to the other side when I brake, it will do just the same on the opposite side.

Maybe some information about the setup will help :
- I use 6-cells Ni-MH pack
- GTB 5.5 system
- HPI S-compound rubber tires
- the minimum brake level is set to 20% on the GTB ESC. I also trie a strong expo on the brake side, but didn't help at all
- I tried to adjust the rear tweak with Hudy station, there was one graduation of tweak before (is that high?). I corrected it by adjusting spring preload, but didn't work.
- ball diff at the rear (AFAIK working properly, smooth and doesn't slip) and one way at the front (also seems to work flawlessly)

Guys, this is my first on-road car, so maybe I'm doing somethink wrong and obvious. But I can't see what!! :confused:

Does my problem reminds you af something?

Thanks for your help :(

[chewie]

the front oneway will give it super squirrly braking.. now set the gtb to neutral minimum brake.. whatever stock is.. and stock drag brake..

go from there. you should have 5 mm of droop all around.

check your shock lengths to make sure they match left to right..
and turn your brake epa down .... that should do it.. but if you dial in the right amount of drag brake around 30 percent(percentage may vary) you shouldnt need to hit your brakes.. just let off and turn..

[Grizzbob]

Correct, that's about how your car will feel with a one-way up front, it disables any front braking action, so if you use brakes, you put a LOT of stress on the rear end to slow the car, & most of the time it'll just lose grip & the car'll spin like you describe. One-ways are used to help a car ROLL through corners without using brakes, you just have to adapt your driving style to roll smoothly through without letting off the throttle too much(& avoid using the brakes, as much as humanly possible). I know it's not easy(& some guys never get comfortable doing it), but those who do learn how to drive like that can carry more speed through corners, & therefore turn better laps. But if you're just not comfortable with that, you might be better off for now using a ball diff up front or a spool(both of those will make it MUCH easier to use the brakes in corners, definitely better for beginners)& then when you feel more comfortable with the car, or feel the diff or spool is slowing you down, try the one-way again..... :cool:

[tino_ale]

Thanks for your answers. So this doesn't mean there is anythink wrong with my car setup? Wow, I didn't know one-way made such dramatic changes in reaction. When the car is fast, I REALLY can't brake without makin the car go 180°. I got to try with a ball diff at the front.

Thanks!

[chewie]

program your drag brake.. = faster in and out of the corners.. which in turn = faster lap times..

[terrible-t]

Check the drag brakes on the ESC.One-way is defeated while braking, braking done by the rear wheels only. If you're useing a brushed motor Check your brushes, the maybe worn. Recheck the adjustment on he rear diff. I have mine tight, so I have braking evenly.

[Demon-TC3]

yea as stated it is just due to the one-way in the front.

Most people who still want brakes and full power during turns go for a spool in the front, it has a very similar effect but will give you brakes.

Only problem is that they are very rough on your CVD's and front tires.

[tino_ale]

Are you guys saying that with front one way, it is not possible to brake at all? Can you ONLY use drag brake, set to max possible?

Don't get me wrong, I believe you. But I just don't see how you can go into a sharp turn at the end of a long straight line, when the car is at it's max speed : how do you make it??? Do you have to decelerate and let the drag brake do its job far in advance?

I guess that as a beginner I have to go to a front diff. Let's start from the beginning.

[Demon-TC3]

hehe you have to be smooth with the throttle, it takes a while to get the hang of but you need to take the corner as smoothly as possible, thats how you carry the most speed.

You need to lay off the throttle (i.e about 50 - 75%) before the turn, and then on power exiting / mid corner.

For about 3 months i completely removed my brake function from my esc just to force myself to drive smoothly, and it worked (immediately my lap times where worse but graduated to be much faster), i now have my brake set slightly higher in case i need to brake however i will try not to.

[terrible-t]

One-Ways has their uses. Good in ovals, & has long straights. Some tracks that are more technical, more "S's", and tighter tracks, more with the Adjustable Balls Diff are more comfortable with. Choose the one that will be suitable on the track conditions. One-way diffs are more used with nitro cars then electric cars. But good when you have it hooked up.

Good Luck!

[Demon-TC3]

they are used allot indoor on carpet as the tracks are usually small and with tight turns...makes sence?

[Grizzbob]

Correct, one-ways are at their best when you have a lot of sweeping corners & have enough grip available that you want to find more corner speed, in those conditions(& indoor carpet tracks tend to favor this) a one-way will give you the extra on-power steering you need to carry most of your speed through, so you won't need to let off the throttle much at all(once you get the hang of it). But if you have low grip, or have to deal with a lot of low speed, tight corners, then you may just be better off with a diff or spool(& from the sound of it, I think you really would be best off to get a diff or spool anyway, & get comfortable with the car like that before trying the one-way)..... :cool:

[tino_ale]

Guys,

Thank you for your help it has been helpfull!

I now have diff at the front as well, and behavior changed dramatically. It's really impressive. I can now brake like hell, even with max brake of my GTB 5.5 (properly geared) the car won't slip and brakes so hard, remaining in line.

I think I'm set to start serious driving on a track! :wave:

[Grizzbob]

No prob, sometimes helping others even helps ourselves, going through that conversation also got me considering making a setup change in my Tamiya 415MSX, & I pulled out my front one-way & finally tried a spool, & it seems to work for me, too(I was initially worried I'd lose ALL my on-throttle steering, but actually, it seems to still have all I need, plus it's calmed my car's rear down)..... :cool: