C4 Frame Project

[Custer55]

American has other styles, but here is a couple of blanks from the custom shop, that just needs the bolt pattern drilled. 17x8 +38mm and 17x9 +48.
http://www.wheelpros.com/wheelSpecs/...torq-thrust-ii

Looks like they can make a set that would work well. I saw they have a 9.5 x 17 +52mm that would be good for the rear. Also some 9.5 x 18 and 10 x 18 that would work for the rear. Around $1,800 to $1,900 for a set but they would look nice on a tri-five.

[55 Rescue Dog]

Looks like they can make a set that would work well. I saw they have a 9.5 x 17 +52mm that would be good for the rear. Also some 9.5 x 18 and 10 x 18 that would work for the rear. Around $1,800 to $1,900 for a set but they would look nice on a tri-five.

Yeah I know they are not cheap, but if they fit and look the part it's worth it. Just make sure you don't pick the wrong size and have a do over.
Unless I can come up with something better I'm going to try and fit 18 x 8 inches wheels with 255/45-18 tires front/rear. Mostly because there are many more tires to pick from in that size. Seems like whenever I find a size tire I might try, then either nobody makes it, or there are only 2 brands of tires to pick from. Just checked tirerack and they have 55 tires to pick from in 255/45-18 and only 2 tires in a 255/50-17

[rockytopper R.I.P 5-13-2017]

Take a look at new Camaro or Charger before you buy. The torque thrust wheels are convex looking with the deep off sets require to fit. They loose a bit of there appeal IMO.

[chevynut]

FRONT
offset: 32mm Backspacing: 6.06" Bolt Pattern: 5-120
20x8.5
245/45 R20


REAR
Offset: 34mm Backspacing: 6.88" Bolt Pattern: 5-120
20x10
275/42 R20

[chevynut]

8.5 front and 10" width on rears.
+18mm offset on front and rear.
245/40's on front, 295/35's on rear.

[55 Rescue Dog]

I'd settle for something like this shown on a C4. It might not show up in the link, but it's the VNB425

http://my.wheelpros.com/browse-wheels.cfm

[BamaNomad]

Here's a couple of photos of the rear of the Corvette Corrections Chassis after I installed the 'ZR1 front wheels/tires' (17x9.5 - 275-40) on the rear; these tires clear the rear chassis by ~3/8" and should fit in the rear of the Nomad wheelwell just fine, but I'm a little concerned about the 275-40's in the front?

I'm also providing a photo of the 'narrowed' wishbone which Billy uses in his chassis which gives him a little bit more freedom of component placement and I think allows the body to be lower?

[chevynut]

The ZR1 front wheels with 56mm offset and 275 tires should work fine in the rear. I calculate the tire to tub clearance at about 5/8" which should work fine. I just put some spacers on a chassis in the shop with an early rear suspension and the same wheels and tires because they rubbed the tubs on both sides. They're also just for rolling the car around. In front they should work fine too, as Brian has found out on his 55.

I didn't notice that CC cut the batwing down and mounted it differently. I don't see any rubber cushions there so it may increase the NVH trasmission to the frame but it looks like it's mounted solidly and the pinion support looks similar to mine except without any flexible mounting...I use a urethane bushing.

What is that structure that goes under the differential for?

Cutting the batwing down should allow it to be placed further up in the frame, with the potential to lower the car more. However, that all depends on other constraints. Once the batwing is free to be moved upward, the limiter becomes the frame rail height directly above the halfshafts. If those are 2x4 frame members above the halfshafts, you have a little less room than a stock frame provides.

The top dogbones should be level or even slightly high at the front end at ride height. The dogbone position then dictates where the knuckle sits.
Looking at the position of the front ends of your top dogbones relative to the body mount on the front of the frame hump, I would say my dogbones are positioned higher than yours (see pics below). In fact, on my chassis you usually have to make a small pocket in the floor for the top of the dogbones (same with Newman's and some others). If you move the front of the dogbones down, you affect the anti-squat characteristics of the suspension. The only other way to prevent that is to put the rearend lower in the frame, which raises the rear of the car.

SDC10444.jpeg

SDC10433.jpeg

SDC10431.jpeg

[55 Rescue Dog]

Here's a couple of photos of the rear of the Corvette Corrections Chassis after I installed the 'ZR1 front wheels/tires' (17x9.5 - 275-40) on the rear; these tires clear the rear chassis by ~3/8" and should fit in the rear of the Nomad wheelwell just fine, but I'm a little concerned about the 275-40's in the front?

I'm also providing a photo of the 'narrowed' wishbone which Billy uses in his chassis which gives him a little bit more freedom of component placement and I think allows the body to be lower?

It is a very interesting design, and looks like it could work great. NVH from a differential should be butter smooth anyway.

[BamaNomad]

I went out and took a couple more photos underneath the differential to show how that frame member works. It actually ties into the bottom of the differential where the rear spring supports are, and supports the front of the pinion from the bottom as well as from the top.

Initially I had the same concern as CN re vibrations (from eliminating the rubber isolation), but driving Billy's car I felt nothing like that... It's hardmounted in 5 or 6 locations to the frame members, so if it 'vibrates'... it would have to vibrate the entire chassis..