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Trouble with alignment
#1
When I went to get the front aligned we ran into a weird problem.
Let's start at the beginning: 
I replaced both upper and lower control arms (both MOOG) along with the idler arm a few weeks ago and waited for the weather to allow me to drive to the alignment shop.
I know the original numbers for the alignment suck, so I spent a lot of time online and fount that people tend to agree on 1-2.5 degrees of positive caster. 
Turns out mine had negative caster, handling was ok. Of course now the alignment was a little out of whack, so I gave them the numbers at the shop.

Here's the Problem:
It is impossible to set positive caster as the lower control arm won't clear the frame. At 1 degree positive the lower control arm will be pushed so far back that it rubs against the frame.
My car must have either negative caster or 0 degree at most unless you want to run into serious trouble.

Anyone else have this issue?

[Image: 1z21rv4.png]

Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
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#2
Hi Mike, maybe the guys from opentracker racing can give you some advise!

http://opentrackerracing.com/technical/

I've bought the MOOG CK series lower control arms myself but I can't give you any advise on alignment issues yet since they still need to be installed....
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#3
Thanks JD. Those are the exact numbers I had. Sad

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Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

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#4
(03-14-2017, 01:44 AM)luxstang Wrote: Here's the Problem:
It is impossible to set positive caster as the lower control arm won't clear the frame. At 1 degree positive the lower control arm will be pushed so far back that it rubs against the frame.
My car must have either negative caster or 0 degree at most unless you want to run into serious trouble.

Anyone else have this issue?


Just to be clear positive caster is the LCA forward of plum or verticle in relation to the UCA. 

Front   /

The car will be unstable and the steering wheel will not return to center without + Caster.

Paul
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#5
You can also add shims to the UCA to adjust caster. That's the old-school method that the 65/66 Mustangs used.

Let me check your shorts!
http://midlifeharness.com

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#6
(03-14-2017, 07:31 AM)rocket366 Wrote: Just to be clear positive caster is the LCA forward of plum or verticle in relation to the UCA. 

Front   /

The car will be unstable and the steering wheel will not return to center without + Caster.

Paul

YESSS, that's what I thought! But the machine in their shop says the opposite. Positive for them is setting the lower control arm further back. 
Coukd there be a difference in between US descriptions and European ones? I gotta look that up. 
I asked the guy at the shop "Doesn't positive mean forward?" And he told me no and showed me that when he put it forward the machine showed more and more negative caster. 
So, given the fact I'm not that great a mechanic, I thought I had misunderstood the concept. He's a professional and has a very expensive gadget to prove him right.

[Image: 1z21rv4.png]

Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

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#7
Something is getting lost in translation. 
You want that lower control arm as far twards the nose of the car.  With power steering you could go all the way up to +4 or 5 degrees caster.
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#8
I dialed in a ton of caster (5-6*) in mine without issue.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

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#9
(03-14-2017, 12:26 PM)luxstang Wrote:
(03-14-2017, 07:31 AM)rocket366 Wrote: Just to be clear positive caster is the LCA forward of plum or verticle in relation to the UCA. 

Front   /

The car will be unstable and the steering wheel will not return to center without + Caster.

Paul

YESSS, that's what I thought! But the machine in their shop says the opposite. Positive for them is setting the lower control arm further back. 
Coukd there be a difference in between US descriptions and European ones? I gotta look that up. 
I asked the guy at the shop "Doesn't positive mean forward?" And he told me no and showed me that when he put it forward the machine showed more and more negative caster. 
So, given the fact I'm not that great a mechanic, I thought I had misunderstood the concept. He's a professional and has a very expensive gadget to prove him right.

The guys are correct. Also from my experience, just because he is "a professional" and has a fancy machine doesn't make him good. I know this would be a tough find in Luxemburg or prob most of Europe but finding someone familiar with older technology in regards to alignment would go a long way.

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


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#10
Got a new appointment tomorrow.
Like I said I saw the machine say towards the rear is plus and towards the front is minus!!
I looked it up and positive is forward here too. So it's their machine.
I replaced the eccentric washers and screens that got twisted during the setup and well give it another try tomorrow. Smile

[Image: 1z21rv4.png]

Mike

"If I were you...... I´d rather be me."  Tongue

Check out my video:
http://www.7173mustangs.com/thread-my-mustang-in-action

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