Phenom question

K

kahaun

New member
Ok, so I bought a Phenom, first time on Track I run into an issue of it pulling hard to the left ALL the time, even when you are just pushing it by hand...LOL

does great donuts! Spins out like you have never seen

1/5 Mile Track

378 Total Weight
56 Left
48 Nose
63 Cross

RF
Caster 10
Camber- 3

LF
Caster 8
Camber +.75

Toe 1/16 Out

Any suggestions would be great as I don't no much about a Phenom
 
57 left
46.5 nose
63 cross
8 + 12 caster or 7 + 10
+ 1/2 lf and - 2 3/4 - 3.0 rf
1 1/2 front and 7/8 - 1.0 rear stagger
 
Nose: 46.0-46.5%
Left: 57.0-58.0%
Cross: 62.0-66.0%

LF: Camber: +3/8
Caster: 7
Toe: 1/16" Out
Run hub in as far as possible without tire/rim rubbing spindle arm

RF: Camber: -2.75
Caster: 10
Toe: 0" Square
Run hub in as far as possible without tire/rim rubbing spindle arm

Stagger: Front: 1-1/2"
Rear: 1-3/8"
depending on corner radius

Rear Track Width: 39-1/4"
RR rim 3/16" from frame rail, adjust LR accordingly
 
kahaun said:
Ok, so I bought a Phenom, first time on Track I run into an issue of it pulling hard to the left ALL the time, even when you are just pushing it by hand...LOL
Click to expand...
the pull to the left is caused by the rear stagger. The LR is smaller in circumference than the RR. The reason for that is to help you turn left.

From the desk of Al Nunley
Comments compliments criticisms and questions always welcome.
If the data does not support the theory, get a new theory.
(Al Nunley)
 
kahaun said:
Ok, so I bought a Phenom, first time on Track I run into an issue of it pulling hard to the left ALL the time, even when you are just pushing it by hand...LOL

does great donuts! Spins out like you have never seen

1/5 Mile Track

378 Total Weight
56 Left
48 Nose
63 Cross

RF
Caster 10
Camber- 3

LF
Caster 8
Camber +.75

Toe 1/16 Out

Any suggestions would be great as I don't no much about a Phenom
Click to expand...

48% nose and +.75 lt fr camber is helping it spin out for sure.
 
Go down on nose to about 46.5 if you can and positive .5 lf camber. I'm assuming from your location you run tracks like bi state, 41, and Ben hur, so you might wanna try -3* on the rf. IMO

Hope this helps we love our Phenoms and their fast under the right conditions
 
alvin l nunley said:
the pull to the left is caused by the rear stagger. The LR is smaller in circumference than the RR. The reason for that is to help you turn left.

From the desk of Al Nunley
Comments compliments criticisms and questions always welcome.
If the data does not support the theory, get a new theory.
(Al Nunley)
Click to expand...

Al, i am 1/2 rear. Doubt its stagger
 
BrendanFitz #73 said:
Go down on nose to about 46.5 if you can and positive .5 lf camber. I'm assuming from your location you run tracks like bi state, 41, and Ben hur, so you might wanna try -3* on the rf. IMO

Hope this helps we love our Phenoms and their fast under the right conditions
Click to expand...

Yes, and LV
 
Ive never ran less than 1" on a 1/5 mile, maybe 7/8" at the lowest. I would go to numbers similar to extremeracer but more specific, this:
1 3/8" front stagger
1" rear stagger (set stagger first and scale with feature air pressure)
46.4-46.6 nose (Get this exact)
58 left
65 cross
7 & 10 caster
3/8 lf
-3 1/8 rf
 
kahaun said:
Al, i am 1/2 rear. Doubt its stagger
Click to expand...
you could try putting two equal circumference tires on the rear axle and see what happens.

From the desk of Al Nunley
Comments compliments criticisms and questions always welcome.
If the data does not support the theory, get a new theory.
(Al Nunley)
 
Its an LTO kart, its going to go left on its own. The combination of stagger, camber, and caster, is whats making it want to go to the left.
If i pushed a kart and it went to the right, id throw it away!!
 
SoCo Tire Treatments said:
If i pushed a kart and it went to the right, id throw it away!!
Click to expand...
the only way an LTO kart could go to the right, when pushed, would be if it had a really bad setup. Throwing it away, instead of fixing it, seems a waste.

Can you explain to me where caster and camber have anything to do with making a kart want to turn left? They help the kart turn left, when set properly, but I don't think they are have anything to do with making it turn left. Do the experiment, put equal circumference tires on the rear and push the kart. Real simple.

From the desk of Al Nunley
Comments compliments criticisms and questions always welcome.
If the data does not support the theory, get a new theory.
(Al Nunley)
 
Caster causes a pull to the left because there is less resistance to turn left when left front caster is decreased. With higher caster on the right front, the tire is trying to pull up as pressure is applied and camber also increases as the wheel is turned. The static camber starts the pull to the left, then camber increases at the same time, causing more pull. The left front is easier to explain. If the tire is leaning to the left, it will naturally pull in that direction
 
LOL. Did have both rights on the back and the same circumference...in a hurry and did not catch that one time.
Still turned to the left though, cross making the left front wheel not touch the ground had something to do with it.
 
hotelcalifornia said:
Caster causes a pull to the left because there is less resistance to turn left when left front caster is decreased. With higher caster on the right front, the tire is trying to pull up as pressure is applied and camber also increases as the wheel is turned. The static camber starts the pull to the left, then camber increases at the same time, causing more pull. The left front is easier to explain. If the tire is leaning to the left, it will naturally pull in that direction
Click to expand...

You're wasting your time. LOL
 
There are several groups of good numbers in the thread, hotelcalifornias are as good as any.

LTO karts will always pull left and the best ones I've ridden pulled hard. You do have a bit much nose for the kart so less may help.

Todd
www.dynamicsofspeed.com
 
You must log in or register to reply here.
Back
Top