R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 05-30-2011, 09:27 PM   #1
Tech Adept
 
Join Date: Dec 2010
Location: San Jose, CA
Posts: 127
Default what's the best way to tame my rear end (8 2.0)

I feel that my back end is just very loose coming out on turns (i guess that's on-throttle). I think if I could get the rear wheels to spin less on-power my buggy will hold the lines better. My diff oils is at 5-5-3 right now so which one of the following options should i do:

a) thinner center diff - front wheels unload more, reduces oversteer etc...
or
b) thicker rear diff - reduces wheel spin, decreases rear traction while cornering.

I heard that the smart diffs might solve my issue but dont really wanna spend that much money.

thanks
mk74 is offline   Reply With Quote
Old 05-30-2011, 09:36 PM   #2
Guest
 
Join Date: Jun 2009
Posts: 2,161
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by mk74 View Post
I feel that my back end is just very loose coming out on turns (i guess that's on-throttle). I think if I could get the rear wheels to spin less on-power my buggy will hold the lines better. My diff oils is at 5-5-3 right now so which one of the following options should i do:

a) thinner center diff - front wheels unload more, reduces oversteer etc...
or
b) thicker rear diff - reduces wheel spin, decreases rear traction while cornering.

I heard that the smart diffs might solve my issue but dont really wanna spend that much money.

thanks
I would longer wheel base, 7000 in the center,
LOSIRACER77 is offline   Reply With Quote
Old 05-30-2011, 09:56 PM   #3
Tech Champion
 
bigjayjay1's Avatar
 
Join Date: Jul 2009
Posts: 5,605
Trader Rating: 86 (99%+)
Default

Try

7,10,3

3/3 rear or 3-4 rear

Get the V2 Tower if you dont have
.
Sorry thought it was for truggy ignore my posting
__________________
TEAM: SERPENT AMERICA DRIVER -ADVANTAGE RACING PRODUCTS-COMPETITION HEAT INC - HOBBYPRO, VPPRO - BCE-
Serpent: 811N, 811T, 811E

Last edited by bigjayjay1; 05-31-2011 at 11:42 AM.
bigjayjay1 is offline   Reply With Quote
Old 05-31-2011, 12:13 AM   #4
Tech Master
 
1BLADE1's Avatar
 
Join Date: Dec 2009
Location: in a Very BIG house
Posts: 1,028
Default

going up in diffs will help,but it depends on "The Track Conditions"
tires will play a Major part.....

but lets Assume the tires and track is not the entire problem?
ok, going up in the center diff will make matters "Worse" for your loss of traction as going up in the center will give more "Steering"
and will "Increase the 4wd Effcet"
and increase the "On-Power Steering"

if the track has allot of traction and is "Smooth" no major ruts and bumps etc. going up in the center will help with the Forward Traction and Launching out of a corner.....
going "Down" in the center will Calm the car down giving a little more traction and less 4wd "Effect"
99.9% will say if your front tires are Balloning go up in the center,you could have 100,000 diff oil in the center and if your "Stabing the throttle in the Middle of the corner those tires will still "Ballon"
so going down will need to be a bit Smoother comming "Out-Of A Corner"
even still many will Argue this............
95% of the "Pro Drivers" usually start with anything from 5k to 10k
and there is a "Reason there Fast"
now this doesnt not mean going one way or another doesnt "Work"
6 billion people you'll get 6 billion Opinions on the best one or it works for "Them" but this does not mean will "Work for you"
the "Starting Set-Up" for the 2.0 is a good starting point.
also check front "Camber" and toe out.....

front diff, going down,and 5k is really as low as you want to go for most tracks? going too low the car will become inconsistant and want to just "Change Directions" for no reason?
5k for most cars is a good "Start"
good balance of "Turn in and Neutral On-Power Steering"
going Up 7K will help the car be more "Stable" under braking...
will "Slightly Loose" some Initial Turn in steering,but can compensate by rolling on the throttle "Later" being slightly higher 7k etc. will give a little more "On-Power Steering" on "Exit"

the rear, now there is a Strange one, i know seems Weird if going up will make a car loose?
sometimes Not always so? think of it like a Full-scale Dragster,this is a bit extreme but you'll get the idea?
dragsters dont turn ...LOL they go straight really good !!!!
but depepnding on your Anti-Squat and rear toe, a slightly higher rear diff will not let the car "Rotate as Easily" doesnt always take the traction "Away" but may give more On-Power "Traction" on "Exit"
depending on track "Conditions"

or could say has more "Cornering traction and more Steering in the Middle of the Turn....when your lower in rear....

for Example sometimes when tracks get blown out? some drives reffer to setting up ther cars "Square" 5k,5k,5k etc.
going "Down" say for most Losi's 2k for the cars Set-up is pretty "Neutral" gives good mid corner traction but may make the car "loose" on-Power on "Exiting"
a really good Primer for "General Set-Up" is the HUDY off road set up guide.....can help for a "General Guidelines"

and one of the Biggest things 99.999% do not look at?
the "Clutch" if the clutch is set for more Tourqe the car will be Loose.
if running the 8ight 2.0 a good Balance is 2 alloy shoes on Green and 2 Carbon on Black
check the Flywheel as well if there are "Diviots" under where the Spring sits may be also time to change the "Flywheel" will make the springs feel "Looser" than they "Are"
a Clutch has a Big effect as well......


as for the rear V2 Tower? there is none made for the Buggy nor any Part listing for one that "I am Currently Aware" of.....
the V2 is for the Truck.......
there is a "Carbon-Fiber one" part # TLR1720
but this is mostly used for "Electric"
the "Current" updated tower is the 2.0 "Buggy" part# LOSA1735
which is the tower used on all the 2.0 series Buggies....

hope some of this can help.....
__________________
the "ORIGINAL BLADE"- BLADE LUNA AGAMA A8 EVO/A8T - Ω-OMEGA Racing
RGX Racing Inc. Custom Airbrush Graphics-D&B custom Bodies- VP-PRO
Progressive Engineering(R&D) MONSTER Drink / PRO-MATCH ,OAKLEY Eye Wear
1BLADE1 is offline   Reply With Quote
Old 05-31-2011, 07:34 AM   #5
Bus
Tech Master
 
Bus's Avatar
 
Join Date: Mar 2008
Location: Raytown, MO
Posts: 1,639
Trader Rating: 4 (100%+)
Default

Guys I think you missed the most important question! Its a losi and losi's are ran with a +2 degree toe out! If memory serves correct! This is what is done and will settle your rear end!

Not sure if you missed this step or not!

And id start off with what Drake runs 5,7,3
__________________
Bus
John 3:16, Losi 2.0, Losi 2.0 T, B4.1, B44.1
Sponsored by Wife
Bus is offline   Reply With Quote
Old 05-31-2011, 07:50 AM   #6
Tech Lord
 
Frank L's Avatar
 
Join Date: Dec 2008
Location: NorCal
Posts: 12,500
Trader Rating: 148 (100%+)
Default

Try this. Move the rear hub forward and move the rear camber link either up our out on the hub so a longer link. Also a softer rear spring will help with rear traction. Try them 1 at a time.
__________________
- X-Ray/ RC America Team Driver - MKS -
- XB8 - XB8T - XB8 E - OS Spec III - B2102 - 4PXR -
~ SSC ~ Godfather ~ Ironman ~ ButterySmooth ~
Frank L is offline   Reply With Quote
Old 05-31-2011, 09:34 AM   #7
Tech Apprentice
 
emancipation007's Avatar
 
Join Date: Jul 2009
Location: Santa Clarita,CA
Posts: 96
Default

I went with a softer silver spring in the rear and the green or silver spring in front. also I changed the shock oils to 40 in front 30 in the rear. worked liked a charm.diff were set to 5,7,4.http://jq-products.com/the-news/43-t.../160-the-guide
__________________
On road and offroad man I love racing

Last edited by emancipation007; 05-31-2011 at 09:47 AM.
emancipation007 is offline   Reply With Quote
Old 05-31-2011, 11:06 AM   #8
Tech Adept
 
Join Date: Dec 2010
Location: San Jose, CA
Posts: 127
Default

Thanks guys lots of info here.
Blade, good thing u mentioned the clutch. I used to run the "optimal" carbon/alu setup but the carbon wore out fast so I swapped it wit alu so I got 4 alu shoes now and have forgotten all about it. I'm gonna start wit that n change it back to carbon/alu.

Jus need a verification if i understand this diff thing. So what all the diff oil does is make one side slip more or less right? So during acceleration front axle loose traction n slips first b4 the rear axle since all the weight transfer to the rear. So if I make the center diff thinner it will make the front slip even more transferring more power to the front n less to the rear therefore less spin to the rear. Correct? This mite not actually fix my problem but wanna make sure I understand this whole diff thing.

My setup is the standard that came in w/ the roller manual. I do run the 2 deg toe out and even the 3 deg toe in the rear which seem to drastic to me.

Now back to my breakfast lol thanks again guys
mk74 is offline   Reply With Quote
Old 05-31-2011, 11:39 AM   #9
Tech Elite
 
rangerjkb's Avatar
 
Join Date: Dec 2008
Location: USA
Posts: 2,430
Trader Rating: 38 (100%+)
Send a message via MSN to rangerjkb
Default

++++ Start off with 5/7/3 diff weights, 2 degree toe out on front and Drakes setup for start point, should settle the rear down and be dialed.
__________________
Jason Burks
--------------------------------
Psycho Cells Racing~Hal's Hobby Warehouse~Murfdogg Products~Avid RC
rangerjkb is offline   Reply With Quote
Old 05-31-2011, 12:17 PM   #10
Bus
Tech Master
 
Bus's Avatar
 
Join Date: Mar 2008
Location: Raytown, MO
Posts: 1,639
Trader Rating: 4 (100%+)
Default

Quote:
Originally Posted by rangerjkb View Post
++++ Start off with 5/7/3 diff weights, 2 degree toe out on front and Drakes setup for start point, should settle the rear down and be dialed.
El Paso TX! Get a rope! lol Any good R/C tracks in your neck of the woods?

R/C pro Series here in Pete Hill, MO come on up you can crash at my place!
__________________
Bus
John 3:16, Losi 2.0, Losi 2.0 T, B4.1, B44.1
Sponsored by Wife
Bus is offline   Reply With Quote
Old 05-31-2011, 02:16 PM   #11
Tech Champion
 
Jason Pelletier's Avatar
 
Join Date: Jul 2007
Location: New York
Posts: 8,820
Trader Rating: 33 (100%+)
Default

Learn to drive smoother.
__________________
Island Raceway & Hobby
Jason Pelletier is offline   Reply With Quote
Old 05-31-2011, 02:58 PM   #12
Tech Addict
 
Hate2Looz's Avatar
 
Join Date: Jan 2008
Location: Michigan
Posts: 748
Trader Rating: 27 (97%+)
Default

Two things...

1. Don't get on the gas so abrupt and early.
2. Take steering out of the car by just adding some front toe in.
Hate2Looz is offline   Reply With Quote
Old 05-31-2011, 03:13 PM   #13
Suspended
 
Join Date: Dec 2009
Location: northern michigan
Posts: 7,916
Trader Rating: 202 (96%+)
Default

put a OS motor in it, that will calm it down...LOL, just kiddin guys.....just kiddin!!
__________________
D8 "HARA", OS SPEED, ,SAVOX 1267/68 SERVOS, BYRONS 25%, SPEKTRUM DX3R PRO
D8T GO GXII ,SAVOX 1267/68 SERVOS, BYRONS 25%, SPEKTRUM DX3R PRO
NMRCC -(northern michigan rc club)
inferno13 is offline   Reply With Quote
Old 05-31-2011, 04:49 PM   #14
Tech Master
 
pballer2777's Avatar
 
Join Date: Jan 2009
Location: dirty jerz
Posts: 1,775
Trader Rating: 27 (100%+)
Default

I had the same problem. I went 5k in all diffs and moved the rear camper link out 1 hole on the hub. Now the thing is on rails. No need to b easy on the gas anymore I throw it around the track like a truggy now.
__________________
tlr 8 4.0 /rex engine/aka
tlr 8e 3.0/tekin/aka
pballer2777 is offline   Reply With Quote
Old 05-31-2011, 04:52 PM   #15
Suspended
 
Join Date: Dec 2009
Location: northern michigan
Posts: 7,916
Trader Rating: 202 (96%+)
Default

Quote:
Originally Posted by pballer2777 View Post
I had the same problem. I went 5k in all diffs and moved the rear camper link out 1 hole on the hub. Now the thing is on rails. No need to b easy on the gas anymore I throw it around the track like a truggy now.
looks like i need to LHS tomorrow for some 5k diff oil...LOL, Where are you camber links set?
__________________
D8 "HARA", OS SPEED, ,SAVOX 1267/68 SERVOS, BYRONS 25%, SPEKTRUM DX3R PRO
D8T GO GXII ,SAVOX 1267/68 SERVOS, BYRONS 25%, SPEKTRUM DX3R PRO
NMRCC -(northern michigan rc club)
inferno13 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
NEW AGAMA A8 BUGGGY rc_cal Nitro Off-Road 10213 07-13-2016 12:30 PM
Around The Table With Paul Lemieux(RC-America/Thunderpower) Paul L Electric On-Road 1384 12-18-2009 08:06 AM
Ok so I've narrowed it down to 4 cars. . . . Mabuchi540 Electric On-Road 142 06-04-2004 08:11 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 10:13 AM.


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