Rear Suspension; Steering Linkage Machining And Installation - Mazda RX-7 Service Manual

CHASSIS/STEERI
NG AND SUSPENSION
6 .
7 .
K n u c k l e a r m :
R: 4352 32 301
L: 4352 32 31 1
T h e l i n k a g e u t i l i z e s a s P h e r i c a l
rod end instead of rubber bush-
i n g s . A n d t h e ' k n u c k l e a r m i s
s t r o n g e r a n d h a s b e e n r e d e s i g n -
ed for clearance around the wheel
a n d t i r e .
T e n s i o n r o d , 4 3 5 2 3 4 1 3 0
Bracket, R: 4352 34 850
L:435234 860
T o e l i m i n a t e l o n g i t u d i n a l c o m p l i -
a n c e o f t h e l o w e r c o n t r o l a r m t h e
forward end of the tension rod
h a s a s p h e r i c a l r o d e n d j o i n t .
Crossmember, 4352 34 800
T h i s i s t h e s a m e c o n f i g u r a t i o n a s
stock, but is stronger.
8 . A l i g n m e n t s e t t i n g s f o r f r o n t s u s '
p e n s i o n :
3. Rear anti-roll bar,4352 28 151
T h e s e a r e t h e d e s i g n d e t a i l s :
4. Rear axle control arms,
upper:4352 28 300
lower:435228200
The lower arm has sPherical rod
e n d s i n s t e a d o f r u b b e r b u s h i n g s .
The upper arm has rubber bush-
ings to prevent interference when
c o r n e r i n g a n d i s l o n g e r t h a n
stock.
5 . W a t t l i n k a s s e m b l Y ,
f ateral arms: 4352 28 200
435228 400
center link: 4352 28 450
The connections are sPherical
rod ends instead of rubber bush'
i n g s . T o a l l o w c h a n g i n g t h e r o l l
c e n t e r . t h e c e n t e r l i n k h a s t w o
m o u n t i n g p o s i t i o n s .
6. Bump stop rubber,435228320
To retain susPension travel de'
s p i t e t h e l o w e r e d r i d e h e i g h t , t h i s
bump rubber is shorter than the
stock version.
ll. Machining and Installation Oper'
a t i o n s .
A. Steering linkage.
1 . R e i n f o r c e m e n t o f s i d e f r a m e r a i l
(gear-box attachment Poi nt).
Fabricate a steel Plate and weld
to the side frame rail as shown
i n t h e i l l u s t r a t i o n . T h i s w i l l i n '
crease the rigidity of the steering
l i n k a g e .
C. Rear suspension.
1. Coil spring, 435228011
T h i s s p r i n g i s s h o r t e r
than stock; these are
d e t a i l s :
a n d s t i f f e r
t h e d e s i g n
2. Rearshock absorber, 435228700
( 1 ) T h e d a m p e n i n g c h a r a c t e r i s '
tics have been selected for
r a c i n g p u r p o s e s .
(2) Compared to the stock unit, it
has less travel.
(3) lt is adjustable to allow chas'
s i s t u n i n g .
C o m p e t i t i o n S t o c k
D i a m e t e r ( m m )
1 9 1 8
R a t e ( k g / m m ) 1 . 5
1 . 2
Competition Stock
L e n g t h o f u P P e r l i n k ( m m ) 4 1 3
247
L e n g t h o f l o w e r l i n k ( m m )
495
500
C o m p e t i t i o n Stock
Camber
- 1 ' 3 0 '
+ 1
Caster
3 0
4 "
K i n g p i n i n c l i n a t i o n 14" 42'
1 0 " 5 5
T o e - i n ( m m )
O-out 0.5 3 r 3
C a m b e r o f f s e t ( m m ) 84.2
38
Caster trail (mm)
1 4
1 9
C o m p e t i t i o n
Competition S t o c k
Wire diameter (mm) m i d d l e , 1 1 . 2
b o t h e n d s . 9 . 0
10.2
Free length (mm)
278
3 1 5
Spring rate (kg/mm) 3.2
2.0