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Old 01-05-2015, 01:59 AM
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Default C3/4/5 frankenstein frame

Finally making enough progress to warrant starting a thread... Done messing with the stock stuff, so my plan so far is to take my '69 frame and update it with C4-based rear suspension and a C5/6 based front suspension. I went and purchased Performance Trends Suspension Analyzer so I will be attempting to design my own geometry for the front and rear using a bunch of educated guesses on COG and various other vehicle elements. I am going to make as many adjustable suspension points as I can to go along with my educated guesses made during the design process. Being that both of these suspensions have wheel speed sensors, Im also going to try and get a ABS/Traction control system from a C6Z (hoping to have similar weight, balance and tire sizes) and integrate that into my car.

For the rear I have a D44 out of a '96... 3.54 ratio and ~60k miles!
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The front came out of an '01 (I think?) with 34k miles
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Had a couple friends come over to help get the body off.
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And as of tonight, the diff is hung via the batwing. Still need to make a pinion mount.
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Old 01-05-2015, 03:23 AM
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What did you decide regarding the trackwidth?
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Old 01-05-2015, 04:42 AM
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Going to place the trailing rods on the inside edge of the frame rail like yours... I will deal with the added track width of the later rear with different wheels.
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Old 01-05-2015, 06:11 AM
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I've been mulling over doing this as well to my next C3 - though, I'd solve the track-width problem with the flares I have on the shelf....

thanks for posting, keep up the posting.!
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Old 01-05-2015, 11:18 AM
Bfit Bfit is offline
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I'm interested to see how you go with this ,
I'm doing someting similar ,C4 rear and front suspension.

I have the rear of the diff lower to get 3 degrees pinion angle .
Bfit

Last edited by Bfit; 01-09-2015 at 06:46 AM..
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Old 01-05-2015, 11:54 AM
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Quote:
Originally Posted by vette427sbc View Post
I went and purchased Performance Trends Suspension Analyzer so I will be attempting to design my own geometry for the front and rear using a bunch of educated guesses on COG and various other vehicle elements. I am going to make as many adjustable suspension points as I can to go along with my educated guesses made during the design process.
Have you ever heard of the method of jacking the front of the car up while the front and rear are on scales (and then repeat with the rear) to find COG? Looks like it's too late for you to do it but maybe someone else has.
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Old 01-05-2015, 02:09 PM
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Quote:
Originally Posted by BBShark View Post
Have you ever heard of the method of jacking the front of the car up while the front and rear are on scales (and then repeat with the rear) to find COG? Looks like it's too late for you to do it but maybe someone else has.
I though about it, but I figured changing the front and rear suspension weights and eventually an aluminum block would just throw those numbers out the window. My biggest guess is the COG height. Im not sure how you would even calculate that without mapping the entire car in solid works or a similar program.
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Old 01-05-2015, 08:14 PM
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Subscribed.
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“Adding power makes you faster on the straights. Subtracting weight makes you faster everywhere.” Colin Chapman
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Old 01-05-2015, 09:21 PM
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Quote:
Originally Posted by vette427sbc View Post
Quote:
Originally Posted by BBShark View Post
Have you ever heard of the method of jacking the front of the car up while the front and rear are on scales (and then repeat with the rear) to find COG? Looks like it's too late for you to do it but maybe someone else has.
I though about it, but I figured changing the front and rear suspension weights and eventually an aluminum block would just throw those numbers out the window. My biggest guess is the COG height. Im not sure how you would even calculate that without mapping the entire car in solid works or a similar program.
Here is a simplistic view of how to measure COG

I wish I could post as an image but am no longer able to load images

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File Type: pdf COG.pdf (66.4 KB, 18 views)

Last edited by BBShark; 01-06-2015 at 12:56 AM.. Reason: Photobucket!
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Old 01-05-2015, 09:28 PM
Bfit Bfit is offline
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Looking at the PDF attached above
I think you will find the base c3 weights about 2000 lb on the front and 1400 lb on the rear . Roughly
Bfit

Ps
But I think you have just put up an example to show how you can work this out
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