84-87 vs 88 front suspension (Page 2/10)
fireboss JUN 02, 07:23 PM

quote
Originally posted by olejoedad:

Wish I could give you another ' + ', blooze!
Nice post!



Yep you always get a little more when he post.
Like educated!
BillS JUN 03, 01:40 PM
I had the good fortune to own both 1987 and 1988 GTs at the same time, so have a good basis for comparison. I am also a racer and very particular about handling.

The 1988 is significantly better in feel as well as comportment at the limit in a corner. I never ran a slalom course with both cars so can't give you objective numbers.
zkhennings JUN 03, 04:44 PM
So does the kingpin angle only exist to reduce scrub radius?
Bloozberry JUN 03, 05:48 PM
The king pin angle was created to reduce the scrub radius, but in so doing, it also created a secondary effect. The larger the king pin angle, the more quickly your wheels return to the straight ahead position on their own after a turn, similar to caster. The reason it does this is because turning the wheel in the steering axis (about the king pin inclination) actually lifts the nose of the car up slightly as well. The tendency is for the car's weight to return to the lowest position which in turn forces the wheel back to straight ahead.
Mickey_Moose JUN 04, 01:40 PM

quote
Originally posted by Bloozberry:

The king pin angle was created to reduce the scrub radius, but in so doing, it also created a secondary effect. The larger the king pin angle, the more quickly your wheels return to the straight ahead position on their own after a turn, similar to caster. The reason it does this is because turning the wheel in the steering axis (about the king pin inclination) actually lifts the nose of the car up slightly as well. The tendency is for the car's weight to return to the lowest position which in turn forces the wheel back to straight ahead.



I have noticed this in our 88 vs the 86 we had, actually found it quite noticeable at times.

[This message has been edited by Mickey_Moose (edited 06-04-2014).]

Csjag JUN 04, 02:36 PM
I think tire size has a lot to do with how the handling "feels" too. I have an 85 2M4 with 195/70-14 tires and an 85 GT with 205/55-16 tires. The 2M4 feels nimbler and more controllable and is less affected by bumps.
zkhennings JUN 05, 02:47 PM
Is it desirable to package everything well to reduce kingpin angle while maintaining the same scrub radius? Because the kingpin angle is going to create negative camber anytime the wheels aren't pointed straight, while caster is more friendly as it adds negative camber to outside wheel and positive camber to the inside wheel.

Edit for some reading material:

http://www.wheels-inmotion....ngpininclination.php

[This message has been edited by zkhennings (edited 06-05-2014).]

Bloozberry JUN 05, 04:21 PM

quote
Originally posted by zkhennings:
Is it desirable to package everything well to reduce kingpin angle while maintaining the same scrub radius?



You can't really reduce the king pin angle because it's cast into the knuckle by the location of the upper and lower ball joint mounts.
zkhennings JUN 06, 11:59 AM

quote
Originally posted by Bloozberry:


You can't really reduce the king pin angle because it's cast into the knuckle by the location of the upper and lower ball joint mounts.



I'm designing a new suspension which may be including custom knuckles. I was wondering if it is beneficial if starting from scratch. I'm still trying to decide if it would be worth it (custom knuckles), because I could use any bearings I want, any brakes and rotors I want, and do whatever I want with the geometry
WHEELIE JAN 31, 01:41 PM
I just found this post and I am attempting to align my 1988 kit car. I have an old vintage snapon aligning tables with caster/camber gauges and have aligned 86s before but I see the castor on the 88 is adjustable by moving the upper control arms in and out on either end. What I dont understand is the kingpin angle. If I move the upper arm all the way in it would increase and all the way out would decrease. Then the caster is adjusted by moving the front or rear in or out separately. So if I start all the way in I could increase the kingpin angle. Is this a good thing with wider kit car wheels or is there a magic number I should look for. And... how do I check the kingpin angle with the camber gauge? Nobody seems to mess with the kingpin angle but it seems important to me.
thanks Wheelie

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