[Orange2V]

Browsing thru pages and pages of suspension talk on this forum I noticed I rarely see anyone say anything other than what control arms to buy and the repeated argument about poly or spherical joints.

Traction really lies in geometry.

Here is a cool tool that lets you play with 4 link adjustments to manipulate your instant center to gain anti squat aka LIFT in the rear of your car.

4 (four) Link Software Program for Drag Racing Suspension

You should set your rear suspension to take advantage of the torque your car makes to drive the wheels into the ground making traction.

*Instant center is the point where your UCA and LCA's would intersect if they went on forever.









I think the CHE axle brace with LCA relocation brackets are a must have if drag racing is your thing. I'm shocked you don't see more people with it.





In my opinion if you want a huge gain in traction get LCA relocation brackets and rear coil overs. Period!


Forgive the randomness. This stuff goes around in my head constantly. Glad I could dump it on you guys. Now I feel better!

[Criscone]

very neat, i like reading up on this stuff but never understand it in full detail

[sharkbait]

I think iv seen your car before.

[4.6DreameR]

The lca in the front being higher works great. I've installed UMI liftbars, solid lca with spherical bushings on both ends and relocation brackets, big difference in traction. You can really feel the rear tires being pushed into the ground in 1st and 2nd during normal driving.

[cstires]

I have the CHE relocated lowers and really like them. I also went with their adjustable uppers as well.

Traction was greatly improved.

[MustangMatt96GT]

You see the Upper Control arm being relocated more often that i all.

But you are 100% correct the the traction lies in the geometry.

Most dragsters or rails as I call them, have a 4 link setup, and are setup so the bottom bars are parallel and the top point down. The bottom bar is normally always parallel or has a 1-3 degree incline upwards. The top bar is the bar that is angled negitively. The top bar is what is used to change the instant center and anti squat values.

I have a Baseline Relocated Upper kit on my car. I have been 1.5's 60' with 409 horsepower. Its unfortunate I couldnt try them out with the new setup before it decided to eat itself, I think I could have gone 1.3's pretty easy with some suspension tweaking.

[bulloch27]

So many people don't understand this and just as many are scared away by thinking it's too complicated. Good software you've posted up and as long as you have enough mounting points it's worth the money if you don't wanna do it on paper. There are free IC programs online but this program would be nice to track different dial-ins at different tracks, weather conditions and so on. Good post. Reps

[Jazzer The Cat]

Actually.... traction lies in tires, while a good launch lies in geometry

Relocation brackets are rarely discussed and you are correct sir

Jazzer

[Eagle2000GT]

Originally Posted by Orange2V I think the CHE axle brace with LCA relocation brackets are a must have if drag racing is your thing. I'm shocked you don't see more people with it.

I found this on the CHE website. What do they mean, "Designed for use with control arms with modified spring perch and swaybar mounts?" They didn't have any modified LCAs for sale.

[PRODUCTIONMAN]

I'm very interested in that CHE component, and just did a google search and can't seem to find it. Only see the brace without the LCA relocation option. Anyone know where it can be purchased? I currently have a SWAR bar for strengthening, but that CHE piece looks to be much better all around.

[Eagle2000GT]

I was just at the CHE site. It says not available. Contact them for availability.
View the Track Attack Rear Suspension Axle Brace<br>Part No. CHE9D at http://www.cheperformance.com

[Jazzer The Cat]

Originally Posted by Eagle2000GT I found this on the CHE website. What do they mean, "Designed for use with control arms with modified spring perch and swaybar mounts?" They didn't have any modified LCAs for sale.

I can see by the way this thing is designed, it will likely have some clearance issues with an OEM located sway bar. I am sure that the modified sway bar mounts move the sway bar probably lower and back. Not sure why the spring perches would need to be modified

Jazzer

[Eagle2000GT]

Jazzer, I had a student invite me to an autocross event. I'm not a twisty guy but I thought it might be fun. I told him maybe next year. Maybe I'll convert to the dark side. You never know.

[Jazzer The Cat]

MUAAHHHAAAAAAHAAAAAAAA



Be prepared to fall in love

[WickedSnake00]

That's some nifty software.

I was well aware about the different things you can do with an SRA to improve launch, be it 3 or 4 link.

But now that I find myself in the unknown world of IRS, is there really anything to improve launch geometry? In the case of IRS the only adjustable link is the rear toe arms. I've seen how much a well set up SRA can improve launch (I even remember old-school ladder bars ) but for IRS do I basically just dial in the spring rate and hope for the best?

[bulloch27]

Originally Posted by Jazzer The Cat I can see by the way this thing is designed, it will likely have some clearance issues with an OEM located sway bar. I am sure that the modified sway bar mounts move the sway bar probably lower and back. Not sure why the spring perches would need to be modified Jazzer

The spring perches on the LCA need to be modified (raised) because when you lower the rear mounting point you are also lowering the spring perch. The spring perch has to be raised as you lower the rear of the LCA to maintain the same ride height.

[Orange2V]

Originally Posted by Eagle2000GT I found this on the CHE website. What do they mean, "Designed for use with control arms with modified spring perch and swaybar mounts?" They didn't have any modified LCAs for sale.

That's the catch. It means you will have to go to a coil-over when using relocation brackets on our cars because the spring perch is on the LCA. If you relocate the LCA it makes the angle too steep and the space too big for the LCA to house a spring.

*You will notice on 05+ the spring location is no longer on the lca. That's why you find relocation brackets everywhere for those.


Same for the sway bar. If the sway bar is mounted to the LCA's when relocated, the sway bar will probably rub on the ground. In a drag setup of this nature you wouldn't run a sway bar at all anyway.

[Orange2V]

Originally Posted by bulloch27 The spring perches on the LCA need to be modified (raised) because when you lower the rear mounting point you are also lowering the spring perch. The spring perch has to be raised as you lower the rear of the LCA to maintain the same ride height.

Yeah. What he said!

[bulloch27]

Originally Posted by Orange2V That's the catch. It means you will have to go to a coil-over when using relocation brackets on our cars because the spring perch is on the LCA. If you relocate the LCA it makes the angle too steep and the space too big for the LCA to house a spring. *You will notice on 05+ the spring location is no longer on the lca. That's why you find relocation brackets everywhere for those. Same for the sway bar. If the sway bar is mounted to the LCA's when relocated, the sway bar will probably rub on the ground. In a drag setup of this nature you wouldn't run a sway bar at all anyway.

It's not that big of a deal if you have some fabrication skills........ a little work, but not hard at all to overcome. I will agree with you that coil-overs will make it way easier.

[Jazzer The Cat]

Originally Posted by bulloch27 The spring perches on the LCA need to be modified (raised) because when you lower the rear mounting point you are also lowering the spring perch. The spring perch has to be raised as you lower the rear of the LCA to maintain the same ride height.

Hadn't thought about that and makes sense