R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 04-28-2011, 11:01 AM   #1
Tech Rookie
 
Join Date: Apr 2011
Posts: 3
Default D8 Hara Flipping over

I'm in the process of tweeking my new HB D8 Hara and one big issue I have is the thing is ALWAYS tumbling over when I turn it around. Obviously I know what to target, the tires, foams, ride height, shocks and oil, but I was just wondering if anybody else has run into this problem and can offer a quick fix. It usually flips over when im driving it on the grass, but also does it very frequently on the blacktop, either that or its 3 wheelin around corners lol. I have everything stock with the suspension and am running some proline calibur tires with red foams I think.

Has anyone else had this problem with their buggies and knows a quick fix?
Thanks!
Jeezey is offline   Reply With Quote
Old 04-28-2011, 12:07 PM   #2
Tech Elite
 
Join Date: Mar 2009
Location: Aurora, Colorado
Posts: 3,644
Default

Slow down.
__________________
TLR - Spektrum - Horizon - TLR 8ight 4.0 - TLR 8ight-T 4.0 - TLR 22 4.0 - Orion
token is offline   Reply With Quote
Old 04-28-2011, 12:26 PM   #3
Tech Elite
 
blktransam's Avatar
 
Join Date: Mar 2008
Location: IOWA
Posts: 4,242
Trader Rating: 59 (100%+)
Default

plus 1 ^^^
__________________
-Ryan Klemme
NemoRacingUSA.com,Beta tires,Agama, Triton Engines, Rocket Graphics, Byron Fuels, RcRenew, Major Art & Hobby, BuKu Products,
Midwest team manager for Nemoracingusa
Owner of Midwest Rc Tour
blktransam is offline   Reply With Quote
Old 04-28-2011, 01:30 PM   #4
Tech Elite
 
mblgjr's Avatar
 
Join Date: Sep 2006
Location: AL
Posts: 2,175
Trader Rating: 86 (100%+)
Default

Grass? Pavement?

If you're never racing on dirt...then yeah theres a few quick things to change.

Move the upper rear camber link to the innermost and lowermost position at the shock tower.

Move all the shocks "out" at the control arm attaching points.

Run more negative camber all around, but specifically the rear.

Harder compound tires (because on grass and on pavement you'd rather be digging or sliding; soft compounds don't allow that to happen).
__________________
Team Associated Reedy JConcepts.net FusionX USA
mblgjr is offline   Reply With Quote
Old 04-28-2011, 01:59 PM   #5
Tech Initiate
 
Join Date: May 2008
Posts: 39
Default

Quote:
Originally Posted by Jeezey View Post
I'm in the process of tweeking my new HB D8 Hara and one big issue I have is the thing is ALWAYS tumbling over when I turn it around. Obviously I know what to target, the tires, foams, ride height, shocks and oil, but I was just wondering if anybody else has run into this problem and can offer a quick fix. It usually flips over when im driving it on the grass, but also does it very frequently on the blacktop, either that or its 3 wheelin around corners lol. I have everything stock with the suspension and am running some proline calibur tires with red foams I think.

Has anyone else had this problem with their buggies and knows a quick fix?
Thanks!

lower the ride height would be my first suggestion - try 27mm at the rear, 26mm at the front. Drop the car from 300mm, press the suspension down at the front and rear at the same time, let go and let the shocks lift the car up then take the measurements from the deck to the underside of the chassis.

If the car is 3 wheeling around corners based on the front end giving way first then i would assume that the rear end is too high and the front end is slightly too soft. Try 1.4 pistons with 400 in the front and either 450 in the rear, always run the front 50-100 wt softer + run the stock shock positions.

you never really need to run the rear shocks on the inside hole as there is more then enough droop on the outside hole.


If the rear end is giving way first then i would assume that the rear is too soft and the front is too high.

try the aforementioned and it will solve the problem.

1.3's will give slightly more grip on dirt and obviously more pack.

In the UK we race quite a lot on grass which turns to dirt if dry enough.

Also try 3,3,2 in the diffs if the track is slippy, 5,5,2 if grips is not too bad and 7,7,2 if really grippy.

Also run the stock camber positions

Give it a go and let me know how you get on.
rjgreen4 is offline   Reply With Quote
Old 04-28-2011, 07:39 PM   #6
Tech Regular
 
Join Date: Feb 2010
Location: Subang Jaya
Posts: 302
Trader Rating: 4 (100%+)
Default

Check your sway bar. It shouldn't be too loose and shouldn't be too tight either.
dashstryk3 is offline   Reply With Quote
Old 04-29-2011, 06:17 AM   #7
Tech Elite
 
Join Date: Mar 2009
Location: Aurora, Colorado
Posts: 3,644
Default

I love this site.
__________________
TLR - Spektrum - Horizon - TLR 8ight 4.0 - TLR 8ight-T 4.0 - TLR 22 4.0 - Orion
token is offline   Reply With Quote
Old 04-29-2011, 08:27 AM   #8
Tech Rookie
 
Join Date: Apr 2011
Posts: 3
Default

Thanks for the tips all, I did a quick run last night and loosened my front spring compression and it worked a little better but still flipped over at good speeds. Ive ordered some hard compound tires which AKA says is best for grass or pavement. Currently my tires are among the worst for grass and pavement so I'll see how they make a difference. I'll try to play with the camber and ride height as well. My sway bars seem to be perfect.

rjgreen i dont know if im much more of a novice than I thought or if yall use different #'s in the UK but I have no idea what 1.4 pistons are, or what 3,3, 5,5, or 7,7,2 means lol. By 400 and 450 weight are u referring to 40 and 45 wt shock oil? 450 seems wayyyy too thick of an oil to me or am I missing something?Everything else I got lol.

I'm not a big racer, but I do run at my local track and my D8 currently performs wonders on it. However, the price to run on the track is currently crazy high in comparrison to the gas it takes me to get there among other things so those runs are limited, not 2 mention the dirt that seems to always get past my filter and into my engine (yes its oiled, ziptied and sealed everywhere) so mostly I run out in my fewacres of mostly grass and gravel. Not very fun when I have to drive cautiously and am always havin to run and flip the buggy back over.
Jeezey is offline   Reply With Quote
Old 04-29-2011, 08:43 AM   #9
Tech Elite
 
morgoth's Avatar
 
Join Date: May 2010
Location: Belgium
Posts: 2,518
Default

Raise the camberlink on the tower to lower the rollcenter.
Use stiffer springs, thicker oil and lean the shocks to get less griproll.
Use the shortest rear camberlink, this will increase the cambergain.
Use a 3.0mm sway in the front and rear.
Run a little more camber. 3 front and 4 rear is perfect.
Thick diffs like 15-15-7 are the way to go on high grip surfaces like astro and gras.
Limit the droop.
__________________
Serpent BeNeLux teamdriver // FX Engines // Nitrolux fuel
My blog: http://scrubbingspeed.wordpress.com
morgoth is offline   Reply With Quote
Old 04-29-2011, 10:12 AM   #10
Tech Champion
 
Tony Newland's Avatar
 
Join Date: May 2005
Location: Utah
Posts: 5,764
Trader Rating: 50 (100%+)
Default

Quote:
Originally Posted by token View Post
I love this site.
best post evrrrrrrr lmao
Tony Newland is offline   Reply With Quote
Old 04-29-2011, 01:15 PM   #11
Tech Regular
 
Join Date: Oct 2009
Location: Sweden
Posts: 314
Default

Quote:
Originally Posted by Tony Newland View Post
best post evrrrrrrr lmao
Second best post eva
__________________
Life's like a lemon and I want my money back!
Klimpen717 is offline   Reply With Quote
Old 04-29-2011, 03:54 PM   #12
Tech Initiate
 
RCelik's Avatar
 
Join Date: Jan 2011
Location: Los Angeles / New Jersey
Posts: 47
Default

Get yourself a Hudy 1/8 Buggy set up kit. Without a proper setup, the car is worthless.
RCelik is offline   Reply With Quote
Old 04-29-2011, 05:36 PM   #13
Tech Master
 
j_blaze14's Avatar
 
Join Date: Feb 2008
Location: Tampa, Fl
Posts: 1,693
Trader Rating: 34 (100%+)
Default

Quote:
Originally Posted by Jeezey View Post
I'm in the process of tweeking my new HB D8 Hara and one big issue I have is the thing is ALWAYS tumbling over when I turn it around. Obviously I know what to target, the tires, foams, ride height, shocks and oil, but I was just wondering if anybody else has run into this problem and can offer a quick fix. It usually flips over when im driving it on the grass, but also does it very frequently on the blacktop, either that or its 3 wheelin around corners lol. I have everything stock with the suspension and am running some proline calibur tires with red foams I think.

Has anyone else had this problem with their buggies and knows a quick fix?
Thanks!
too much traction, these cars were made to drive on dirt. try harder tires or bald tires on grass/concrete, save the others for the track.
__________________
aGama A8 EVO - Werks B2 - Sidewinder
aGama A8E - TrackStar 150a, 2560kv, 3 and 4 cell
FlySky GT3B, Turnigy HV servos, SKY Lipos
AKA, Proline, Hotbodies Rubber
Elite Performance - HORRC.com
j_blaze14 is offline   Reply With Quote
Old 04-30-2011, 03:09 AM   #14
Tech Initiate
 
Join Date: May 2008
Posts: 39
Smile

Quote:
Originally Posted by morgoth View Post
Raise the camberlink on the tower to lower the rollcenter.
Use stiffer springs, thicker oil and lean the shocks to get less griproll.
Use the shortest rear camberlink, this will increase the cambergain.
Use a 3.0mm sway in the front and rear.
Run a little more camber. 3 front and 4 rear is perfect.
Thick diffs like 15-15-7 are the way to go on high grip surfaces like astro and gras.
Limit the droop.
In the UK we race 6 months of the year on astro, mainly using schumacher mini pins when the astro is dry, as you can imagine the grip level is immense and needs the most careful thumbs in order to not grip roll - we actually drimmel the pins down as the tyres create too much grip.

To date I don't think the HB team run oils so thick in the diffs, the most we run is 7k, this will give more than enough drive in the centre to get up and over anything. I have found if you go any thicker on high grip tracks that the front end of the car wants to lift when coming off jumps and bumps.

If the car is lifting a wheel the first thing to do is ride height, followed by assessing the level of damping in the shocks.

If you can lift the car from 300 to 400 mm and drop, if the car bottoms out then its too soft.

I would say to leave the roll centre and sway bars as stock firstly, sort out the shocks and ride height firstly, followed by droop. If you are getting too much grip roll then lower the car, limit the droop, then if its still rolling try chopping the tyres.

At the end of the day if the tyres are creating so much grip then I would target these as a priority as altering the set up of the car so much to prevent it grip rolling might make the car handle pants around the track.

Don't forget that if you stiffen the shocks, put thicker roll bars, thicker diffs, put more camber and take shed loads of droop of the car = a car that might not grip roll in the corners, however will be pants over bumps and jumps, bounce around and generally be pants to drive.

Try one thing at a time and see what the difference makes
rjgreen4 is offline   Reply With Quote
Old 05-01-2011, 06:27 PM   #15
Tech Rookie
 
Join Date: Apr 2011
Posts: 3
Default

Thanks everybody. I got the problem resolved real quick. I changed my shock oil to 55 rear and 40 front and lowered the ride height to about 22mm. This is what I tried first before, but I was still running the stock shock oil which must be about 30 and it was wayy too soft. With the 55 in the rear its much better and even at full speed pretty much I hit the brake and turn and the buggy slides over the grass. Of course it helps when my grass has been freshly cut too.
Jeezey is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
NEW D8 Atsushi Hara Edition* Atrackstar101 Nitro Off-Road 5998 05-13-2016 12:24 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 11:43 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net