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Author Topic:   Crown Vic?
speed06
Dirt Full Roller

Total posts: 74
posted January 09, 2005 08:30 AM  
I am building a super street out of a 1985 ford crown vic stub, I am getting ready to set up the front suspension and roll center, anyone know what the frame height should be off the ground when setting up the front end upper control arm mounts? Does 4" roll center sound right? I am basing allot of my info from people with camero stub cars and I just want to make sure I am on the right track with the ford.

d4490
Dirt Maniac

Total posts: 143
posted January 09, 2005 12:37 PM  
I have a Crown Vic street stock and have the same type of questions. I would like to know what is the best components to use on the front sub, spindles, ball joints, tie rods, etc. for the best roll center, camber change, bump steer, and ackermann. What is the ideal range for each of these?

speed06
Dirt Full Roller

Total posts: 74
posted January 12, 2005 10:57 AM  
139 views and no advice, wow!

Kromulous
Dirt Forum Champ
Total posts: 796
posted January 12, 2005 12:45 PM  
I run our clip at 9.25" from the floor to Bolts in the lower A-Arms (front).

Roll centers, i dont know yet. I'm still working on them. Making changes.

Ball joints, you just gotta make others work. I use the GM big metrics on top and re-ream it all. I believe the tapers is the large 10 degree type. Lowers i have heard of guys welding in a threaded collar and using the mopat screw in, not sure i havnt tried it.

Also lower inner bushings you kinda have to make due. I hear Camaro ones work, but you gotta modify them.

Call M&M Performance, out of Illinois somewhere. They build Mods on Ford clips and have some knowledge of them.

All in all i like the clip, we got it to run well last year.

speed06
Dirt Full Roller

Total posts: 74
posted January 14, 2005 06:20 AM  
Thank you for the advice, are you using the crown vic spindles? I think I will give M&M a call.

Kromulous
Dirt Forum Champ
Total posts: 796
posted January 14, 2005 08:54 AM  
Yep, we sure do. The spindles are actually quite nice, there tall and it gives you more adjustments on the roll centers etc.

It seems the C-Vic clip is tall, compared to a metric, so you need that xtra spindle height to get good upper arm angle.

In another thread, it was said to keep the RC about 3 to 5" above ground. I find that true as well. I am just adjusting the side to side placement. Offsetting it left or right, i find on higher banked tracks, moving it right helps. As well, left on flat tracks, for more RF bite.

Again, the ball joints are a guessing game. I just ream most of the stuff and get it to fit. If you find out what ball joints to use on the lowers please let me know. I am looking for some that raise the lowers 3/8", like people use on the metrics.

One other note, it helps to notch the clip on the front upper a-arm mount, the fwd bolt / rod arm will hit and it wont allow you to get it low enough. So i notched the frame. It passed tech at a few tracks, so i dont think its a big deal.

M&M can tell you with that, there really helpfull guys over there.

[This message has been edited by Kromulous (edited January 14, 2005).]

speed06
Dirt Full Roller

Total posts: 74
posted January 14, 2005 11:17 AM  
I know if I set the front mounting hole at 9.25" from the ground, my lower ball joint will be about 2 - 2.5" higher then the back pivot point. I thought you wanted to keep this about level if not within 1" of level?

Kromulous
Dirt Forum Champ
Total posts: 796
posted January 17, 2005 07:20 AM  
Not sure of the tires your running, we run the Hoosier 27.5" mod tires. That may be the difference. A super street may need to be higher.

My arms are level at ride height and the upper arm has a 16* downward angle (Ball joint higher).

speed06
Dirt Full Roller

Total posts: 74
posted January 17, 2005 08:50 AM  
I am running hoosier 27.5 also, what spring rates are you running on the front?

Kromulous
Dirt Forum Champ
Total posts: 796
posted January 17, 2005 09:11 AM  
Once i got the roll center into the 3 to 5" range i ran a 1050lb RF and 950 LF. That was on a high banked 1/4 mile.

This year, i want to go a little stiffer, maybe a 1100 RF or 1200 RF. We had just a little to much roll on the RF. That or try to shift the RC more to the right, thats where i am running into some trouble with the ball joints etc.

763 RF shock and a 753 LF as well.

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