Pro Touring 4 link setup - Lateral-g Forums

454SSguy · #1 02-04-2012, 09:43 PM

I use the term "Pro Touring" very carefully. I don't think I could classify my build as pro touring but it definitely has been affected by the concepts of pro touring. I have got quite a few parts in so far and I'm still trying to keep everything super practical (going, stopping and turning), more info in my build thread if you guys wanna read all about that. I'm hoping you guys can help me determine my IC and where to set the watts link.

Setup is a parrallel 4 link, bars will be between 21-23" Center to Center
Coilovers are strange SA 11.25"-17.25" shocks - mounted 10*-15* inward at top
Watts link- Chassis mounted pivot, parts from Fays2, custom pivot mount bracket
Any help or info would be much appreciated.

Bryce · #2 02-05-2012, 12:42 PM

Are the links parrallel in side view or top view or both?

454SSguy · #3 02-05-2012, 05:22 PM

They are parallel in top view. The side view is what I'm wondering about. Curious where to set my bars both top and bottom bars. I think I read for protouring setups the top bar should be level and bottom bar slightly uphill (back to front). Does this sound right?

Bryce · #4 02-05-2012, 10:16 PM

the bottom bar should be horizontal, for limited roll steer and the uppe bars should angle down towards the chassis. I would aim for 50 to 70% antisquat with room for adjustments.

The watts link should also have adjustment. starting with the pivot at the axle centerline should be good.

454SSguy · #5 02-06-2012, 12:42 PM

So that would put the IC somewhere level with the bottom bar, but how far out? I would think around the front wheels or front bumper, but I'm just guessing really. I will definitely need help with the antisquat, I've heard the term alot and understand the concept (how hard it "hits" the tires) but do not know how to set it at all. The watts linkage will be setup at ride height to be...

Pivot centered on diff
Pivot perpendicular with ground
Bars parallel to ground

Anything sound off besides the antisquat stuff?

454SSguy · #6 02-07-2012, 03:44 AM

For anyone following, found this and helped alot. Just need to measure out the CoG of the truck.

http://mysite.verizon.net/triaged/4l...tml/index.html

454SSguy · #7 02-08-2012, 03:45 PM

Alright so I've been doing some researching and have come full circle from thinkin I might want to do a tri 4 link all the way back to the original idea of parallel 4 link and watts link.

Watts link pivot (RRCH) VS CoG line
So I want the RRC pretty low, that makes sense to me, but the question i have is how far is too far. Mainly how far AWAY from CoG line is too far. If the Roll axis is too far from CoG won't that give me LOTS of body roll? Should I make the RRC higher to fix this or keep it down around axle height?

454SSguy · #8 02-09-2012, 01:14 AM

No one has input on Roll center height of a truck? ...

Bryce · #9 02-09-2012, 07:30 AM

Quote:

Originally Posted by 454SSguy

For anyone following, found this and helped alot. Just need to measure out the CoG of the truck.

http://mysite.verizon.net/triaged/4l...tml/index.html

I use performance trends if you ever need more info than whats in that spread sheet. I also developed my own excel spreadsheet that calculates pick up points based on IC and A/S inputs and two of the four pickup points.

Bryce · #10 02-09-2012, 08:00 AM

Quote:

Originally Posted by 454SSguy

Alright so I've been doing some researching and have come full circle from thinkin I might want to do a tri 4 link all the way back to the original idea of parallel 4 link and watts link.

Watts link pivot (RRCH) VS CoG line
So I want the RRC pretty low, that makes sense to me, but the question i have is how far is too far. Mainly how far AWAY from CoG line is too far. If the Roll axis is too far from CoG won't that give me LOTS of body roll? Should I make the RRC higher to fix this or keep it down around axle height?

This all comes back to roll stiffness. Lots of body roll can be reacted with sway bars or stiffer springs.