I am using a c5 front suspension on a project I'm building. I bought the knuckles etc and it came all disassembled. I'm mainly needing the geometry of the A Arms. Is the bottom one level or do they both have a angle to them? Also if someone has a dimension for spacing etc. a auto cad file or preferably solid works file would help too.

 

Check out this link:

http://www.corvetteforum.com/forums/...-geometry.html

 

That's a lot to take in, but I did not see any data on mounting of the Control arms. I basically need to know if the bottom control arm is level or if it's angled. I know the upper is angled. This will help me get it tuned in better. Sadly I have no corvette to measure off of to even get in a close ballpark.

 

When I set-up cars for road racing the lower A-arms are going "downhill" that is the ball joint is lower than the A-arm mounting bolts. In the service manual they have a way to measure "trim height" which is the measurement from the A-arm mounting bolts to the bottom of the ball joint. There is a J-tool that is used to come up with that.

Here is a good thread on how someone made up there own stuff to measure trim height.
http://www.corvetteforum.com/forums/...pension-2.html

Check out post #32 - unfortunately the pictures are gone, but it may explain things a little better.

 

I still can not get a solid answer on mounting location for my tabs. If I run the LCA parallel to the ground and the spindle at the 8.5/9* I keep seeing. Then how much space should be between the LCA and UCA mounting points? This will give me a basic set up to tune off of.

 

I measured from the center of the front mounting bolt of the UCA to the center of the front mounting bolt of the LCA and I got 12 7/8"

From the center to the rear mounting bolt of the UCA to the center of the rear mounting bolt of the LCA I got 10 3/8".

That was with a laser level that has about a 1/16" thick beam so I would say give or take 1/16".

That was on a C6 though.

 

This is the info I am looking for! Thank you. Would you say your front LCA is near parallel to the ground or slightly angled down? If angled down any idea of degree or how much drop from attachment point?

 

It's slightly angled to the ground about 2.5 degrees (however this car is set up for road racing). I used my digital level for that number.

Another thing I measured not sure if it's of interest or not are the angles of the mounting points of the A-arms when looking at the car from the side. For the UCA it was 6.5 degrees and for the LCA it was 2.5 degrees.

 

This car will be mainly a street machine so road racing specs work.

When you say mounting point angle you mean the rear side mounting bolt is higher than the front side mounting bolt on the UCA and LCA? Is it like this factory? I guess I was under the impression the mounting points were parallel to the ground?

 

The mounting points for the arms are definitely at an angle, this is the anti-dive built into the chassis to help the car feel stable under braking. This is the way the car was designed by the factory.

This picture illustrates better than I can describe.




So from the numbers above the front UCA is at a 6.5 degree angle and the LCA is at a 2.5 degree angle from what I measured on the C6.

Here's another picture that shows the upper arm at an angle, this would be the RF corner of the car.

 

Another question. What is the distance from driver side lower control arm mount to passenger side lower control arm mount. Trying to wrap up some frame design spacing for my lower rails.

 

I measured 27 3/16", FYI the front and rear LCA mount bolts are eccentric for alignment.

 

By eccentrically mounting do you mean they are moved to obtain alignment?

 

Correct like this:

 

Building tabs for mounting these will be fun... Guess nothing can be in a straight plane haha.

 

I decided to buy a c5 subframe to obtain my LCA mounting points. Does this subframe bolt in level or do I obtain the 2.5* in the mounting of the subframe

 

I don't have the car on the hoist at the moment so I will have to check and see if there is any angle in the mounting of the cradle. Initially I'm going to say that it is level but I will have to measure to check.

 

Level makes sense to me as the mounting holes appear 90*.

 

I put the car on the leveled scales yesterday afternoon and put my angle finder on the boss that the front spring mounted to (this car has coil-overs) and it was dead level.

 

You've been a great help! I really appreciate your effort in answering my questions.