2nd Gen IRS

[jp455]

Looking good! Whats the deal with the gigantic spring pocket though??

[exwestracer]

Looking good! Whats the deal with the gigantic spring pocket though??

Stock coil spring mount for the350Z. To save interior space, Nissan separated the spring and shock. You can just see the shock eye bosses on the top of the uprights. We had considered using those pockets...for about 10 seconds:bsjerk:... Since he won't need the spring perches, those bulky transverse links are going to be replaced with coilovers and straight tubes later.

[Macadoo355]

I have a bunch of pictures on my phone ill try to swap to the computer tonight, thanks guys

[jp455]

I figured they are the coil spring mount, they just look like the spring has a huge diameter! Good deal that you're getting rid of them, it looks like something a lot smaller and lighter can be substituted.

[exwestracer]

Well, a last update (from me anyway) on the 79 Camaro IRS project. The car is returning home and hopefully will be completed in good time.

Ryan has a few more detailed photos he may share.

The front K member was completed and we designed some innovative upper control arm mounts that mount to the large surface of the inside of the rail, rather than the top. There wasn't time to get the upper mounts for the coilovers built. The body was lowered onto the frame and everything fit together remarkably well. Getting the aluminum IRS cradle to fit for proper ride height required cutting about 1/2 of the rear seat bulkhead out, but the clearances were pretty close. If the cradle had been steel it would have been much easier for Ryan to modify it than cut more floor. Also, the decision to include a full frame welded into the floor probably took up a good week of our limited build time. I believe it was the correct way to go structurally, but the swap could be done much more easily by modifying the IRS cradle and stock rear subframe.

We ended up with a swing arm length of about 2X track width in front, which should be acceptable for the fairly low profile tires he is going to use. The rear is similar, and while we obviously did not get around to checking CG, I think the front and rear geometries will complement each other.

The car left rolling, which was a major accomplishment given that only 2 students did all the work. I hope Ryan will keep us all updated on progress and results.