New Art Morrison IRS

[andrewb70]

That's a good idea. I'll check that out. I initially didn't want to offer the 5th Gen rear brakes because of the front mismatch, but a front adapter would solve that issue.

Matt,

Can you also clarify the parking break components? I see in the pictures of David's rear for his first gen there is a drum brake arrangement. Does the OEM Gen 5 Camaro e-brake system work with the Corvette hubs?

Andrew

[silver69camaro]

Matt,

Can you also clarify the parking break components? I see in the pictures of David's rear for his first gen there is a drum brake arrangement. Does the OEM Gen 5 Camaro e-brake system work with the Corvette hubs?

Andrew

All the parking brake components are Gen 5 Camaro parts, off the shelf stuff. The C6/ZR1 hub is dimensionally identical to the Gen 5 Camaro, minus the register diameter. The e-brake is activated by a small lever pulled by a cable, much like the common Explorer type e-brake. We have a simple adapter that will allow Lokar cables to be used.

When an IRS is ordered from AME, it will be fully assembled when it leaves our shop - which includes the parking brake components.

[DJW32]

David,

The rear setup looks great! Can't wait to see a build thread.

[andrewb70]

All the parking brake components are Gen 5 Camaro parts, off the shelf stuff. The C6/ZR1 hub is dimensionally identical to the Gen 5 Camaro, minus the register diameter. The e-brake is activated by a small lever pulled by a cable, much like the common Explorer type e-brake. We have a simple adapter that will allow Lokar cables to be used.

When an IRS is ordered from AME, it will be fully assembled when it leaves our shop - which includes the parking brake components.

Thanks for the clarification!

Andrew

[carbuff]

Dave / Matt,

Perhaps I missed it earlier in the thread, but can either of you comment of exhaust routing? Did you go under, did either of you take pipes all the way to the rear of the car?

[David Pozzi]

Matt has full tail pipes. Ours kick down at the rear of the cradle.

[David Pozzi]

Did two autocrosses this weekend. The IRS is working great! The car is faster than ever. The amount of rear steer was initially set too high but things are working well with it at a lower setting. Now it's set the same as what Morrison has been running all along.



Same video higher quality: http://m.youtube.com/watch?v=S-nhjVa5V4M

Suspension video


Higher quality version: http://youtu.be/L6ozRyAr6Vs

[silver69camaro]

Dave / Matt,

Perhaps I missed it earlier in the thread, but can either of you comment of exhaust routing? Did you go under, did either of you take pipes all the way to the rear of the car?

You can go under like how David did (and then go up and out the rear, or terminate it at the diff), and we snaked it under the CV then routed beside the fuel tank.

[David Pozzi]

I just went through this thread for the first time and maybe I missed it but I have to assume this is much heavier than a traditional leaf spring/ solid axle rear....right? How much more does it weigh than the standard rear chassis that would be removed? Now for road racing/auto x, would that be a negative because the overall weight was increased? Or maybe positive because the cars weight bias be more evenly balanced?

We gained 70 lbs.
Rear weight percent increased by 1% front weight decreased 1%

[carbuff]

Thanx Matt... Those look to be 2.5" pipes, is that correct? Is there room for 3" through there?

[DJW32]

The vids look good. For comparison sake, did maier show up at this auto-x? If so, what were his times?

[andrewb70]

The vids look good. For comparison sake, did maier show up at this auto-x? If so, what were his times?

What would that information tell you? A Mustang is smaller, lighter, different driver, possibly different tires, etc...Way too many other variables to account for.

Andrew

[silver69camaro]

Thanx Matt... Those look to be 2.5" pipes, is that correct? Is there room for 3" through there?

2.5". 3" could be done, but I'd route it under the diff like how David did. If a person were to order the cradle with the OEM 5th Gen diff, it allows much more room for larger exhaust. The Strange diff is large in comparison.

[andrewb70]

Matt,

What are the implications with regard to the axles when using different diffs (stock 5 Gen vs. ZL1, vs. Strange)?

Andrew

[CraigMorrison]

Thanks for asking great questions guys! Either Matt or myself will try to answer as quickly as possible. One thing that I haven't seen yet is any question regarding track width. We are offering four different track widths. 55.5", 57.5", 59.5" and 61.5". With the four different widths, we will definitely be able to set this IRS up for a lot of different applications. For out GT-Sport line of bolt-in chassis (C1, A-Body, 55-57, 49-54, 1st Gen rear sub) this will be an available option. We will also be able to do this on all of our custom chassis as well as sell the cradle with lose brackets. So far this has been the most popular with a lot of customers retrofitting this suspension into their existing chassis or reinforced OE subframes. While David did the install on Mary's car using the existing OE subframe, Matt has designed a great replacement rear sub for these cars. Any other questions, please let us know.

[silver69camaro]

Matt,

What are the implications with regard to the axles when using different diffs (stock 5 Gen vs. ZL1, vs. Strange)?

Andrew

The Strange diff is a drop-in replacement for a 5th Gen differential, so the axles are the same.

I haven't worked much with the ZL1 differential because the Strange unit is extremely durable, wider range of gear and diff choices, and much lighter. I do not see any advantage to using a ZL1 diff. The ZL1 does offer a diff cooler, but that can be easily added with our system as well.

[CraigMorrison]

The Strange diff is a drop-in replacement for a 5th Gen differential, so the axles are the same.

I haven't worked much with the ZL1 differential because the Strange unit is extremely durable, wider range of gear and diff choices, and much lighter. I do not see any advantage to using a ZL1 diff. The ZL1 does offer a diff cooler, but that can be easily added with our system as well.

And we did this on David's diff cover - added ports for the external pump and cooler.

[David Pozzi]

The vids look good. For comparison sake, did maier show up at this auto-x? If so, what were his times?

We tested at a different event closer to home & got in a lot more runs. Maier & Hobaugh were at Goodguys in Pleasanton.

I had some extra bungs put on the diff cover. Will monitor temps to see if a cooler is needed.

[andrewb70]

The Strange diff is a drop-in replacement for a 5th Gen differential, so the axles are the same.

I haven't worked much with the ZL1 differential because the Strange unit is extremely durable, wider range of gear and diff choices, and much lighter. I do not see any advantage to using a ZL1 diff. The ZL1 does offer a diff cooler, but that can be easily added with our system as well.

The only reason I am talking about the ZL1 rear diff is because the Strange can only go down to a 3.50 gear, while the ZL1 is offered in a 3.23.

Andrew

[DJW32]

What would that information tell you? A Mustang is smaller, lighter, different driver, possibly different tires, etc...Way too many other variables to account for.

Andrew

Simple. Mary and mike are very fast. If Mary, or David, would have beaten Mike by a good margin, I would say that the new rear is worth it's weight in gold.