Steering and suspension geometry setting details

[C-Mack]

Just FYI, you cannot change one side without the other following. Meaning what ever the caster is on the right then the left will always be the same. You can cause some bushing bind at best and maybe cause the axle to be a bit out of line with the chassis but that is marginal if much at all. But so long as you adjust both sides at the same time and the cam or eccentric bolts are in the same general orientation then your fine. But again you cannot have one side of the truck with say 1.5° of caster and the other with 3°. That's impossible unless you broke your axle in a wreck. Any delta between left and right is either alignment machine error or tolerance maximums from Carraro.

Agreed, tolerance changes would be minimal and as I mentioned “slight”. The only risk you’d run, as you mentioned, would be the potential of one cam adjusted a little ahead or behind the other taking the axle slightly out of line but it would be within the gross tolerance specifications. Assuming you loosen both caster cams at the same time adjusting them will make the entire axle rotate to the new caster angle if you keep them both in the same orientation.

Either way, I’d still make the changes on an alignment rack to ensure axle remains straight with chassis and to watch and record your final caster settings and verify all other angles. After all, you are there making changes anyway so check everything so you know what you have and then drive and see if you like the caster changes you made.

 

[ziploc_adv]

anyone got a video showing how to adjust hte bolt for us rookies is it just as simple as tightening it down to max or more precise which means bring to a trusted tire shop

Owl made a video that may be helpful: The Best Free Upgrade to Your Ineos Grenadier: Adjusting Your Caster

 

[spyder6255]

yeah but really doesn't show you much expect which one's to adjust... usually they show you how to exactly do it, but probably liability on this one

 

[Dokatd]

yeah but really doesn't show you much expect which one's to adjust... usually they show you how to exactly do it, but probably liability on this one

It will become brutally apparent once you get in there.

 

[abbeyroad]

Update:

Had owner/tech Doug @ Truline align the Grenadier. Doug knows the IG as Ineos Seattle uses his services at his Seattle location.

He nailed it. Steering is really tight and straight. I love that he was able to max out caster a bit beyond stock range.

 

[spyder6255]

Update:

Had owner/tech Doug @ Truline align the Grenadier. Doug knows the IG as Ineos Seattle uses his services at his Seattle location.

He nailed it. Steering is really tight and straight. I love that he was able to max out caster a bit beyond stock range.

View attachment 7907086

So rides better? Also does it matter one is 2.46 vs 2.49?

 

[abbeyroad]

So rides better? Also does it matter one is 2.46 vs 2.49?

It drives really nice. Nominal.

 

[spyder6255]

It drives really nice. Nominal.

So she tracking straight perfect. I’m going to my guy. Thanks

 

[Dokatd]

So rides better? Also does it matter one is 2.46 vs 2.49?

You cannot adjust the delta between the left and right. It's manufacturing tolerances.

 

[Dokatd]

I c

Update:

Had owner/tech Doug @ Truline align the Grenadier. Doug knows the IG as Ineos Seattle uses his services at his Seattle location.

He nailed it. Steering is really tight and straight. I love that he was able to max out caster a bit beyond stock range.

View attachment 7907086

I could be recalling this wrong, but I believe the max spec for Ineos was 2.5°. Mine is at 2.6-2.7°. One of the Vendors claims they are hitting 3°

 

[abbeyroad]

I c

I could be recalling this wrong, but I believe the max spec for Ineos was 2.5°. Mine is at 2.6-2.7°. One of the Vendors claims they are hitting 3°

 

[abbeyroad]

You cannot adjust the delta between the left and right. It's manufacturing tolerances.

What?

 

[TCMColorado]

What?

Caster is fixed by the knuckle on each side of the axle. Given the front axle is solid you cannot change caster left to right because you would have to twist the axle tube to do so. What you can do is rotate the whole assembly by using the cam bolts on the control arms. If there is variance left to right it is because one knuckle is slight rotated in relation to the other side and this happened during the manufacturing process.

 

[abbeyroad]

Caster is fixed by the knuckle on each side of the axle. Given the front axle is solid you cannot change caster left to right because you would have to twist the axle tube to do so. What you can do is rotate the whole assembly by using the cam bolts on the control arms. If there is variance left to right it is because one knuckle is slight rotated in relation to the other side and this happened during the manufacturing process.

Not sure I'm understanding here because on the IG, you can adjust the toe and caster. Camber is fixed front and rear. Yes, there are limitations to the caster spec variance left and right, but the delta in values can be fine tuned by an alignment tech that gives a darn.

 

[pmatusov]

Not sure I'm understanding here because on the IG, you can adjust the toe and caster. Camber is fixed front and rear. Yes, there are limitations to the caster spec variance left and right, but the delta in values can be fine tuned by an alignment tech that gives a darn.

You cannot independently adjust right and left side caster angle.

 

[abbeyroad]

You cannot independently adjust right and left side caster angle.

But the variance can ultimately be fine tuned left right (for the OCD).

 

[TCMColorado]

But the variance can ultimately be fine tuned left right (for the OCD).

On a vehicle with independent suspension yes caster can be fined tuned left to right. On any vehicle with a solid axle it cannot. One could try to force the issue by adjusting the cam bolts on a single side but this will introduce binding forces into the control arm pivots which is not a good idea. That said if a vehicle uses ball joints for the knuckles it is possible to use offset ball joints to alter the caster but that is beyond the scope of this discussion and in any case the Grenadier has kingpin knuckles and does not use ball joints.

 

[C-Mack]

Think of it this way… hold a pencil or straw at either end with your fingers and imagine a straight line drawn down its length. Now rotate the straw with your right hand only so the line rotates back towards you (that’s your caster adjustment for example) what does the line do at the other end of the pencil/straw? It’s in the same position as in your right hand. The axle is solid so you can’t have different caster angles at either end because it’s effectively one solid lump of metal.

Caster is adjustable using the cams to rotate the axle by lengthening or shortening where the control arms are attached to the chassis but it’s going to effect the whole pencil/straw/axle. Worst you can do is not have the cams evenly set side to side which can take the axle ever so slightly out of line with the chassis hence why having the vehicle on an alignment rack is the best way to make adjustments so you know your measurements.

 

[pmatusov]

But the variance can ultimately be fine tuned left right (for the OCD).

The difference between right and left caster angles cannot be adjusted without a major surgery.

 

[Dokatd]

What?

Looks like your "WHAT" has been answered.