Roadster Shop Fast Track IRS
 

Introducing the all new Roadster Shop Fast Track Independent Rear Suspension.

The first performance based IRS designed specifically for pro-touring and performance muscle cars.

Currently available in all Roadster Shop Chassis, universal back half kit, and weld in crossmember assembly.

http://i563.photobucket.com/albums/s...le/RearIRS.jpg

http://i563.photobucket.com/albums/s...velle/irs2.jpg

http://i563.photobucket.com/albums/s...cture18230.jpg

http://i563.photobucket.com/albums/s...cture18254.jpg

http://i563.photobucket.com/albums/s...cture18263.jpg

Man that is sexy!

Darren

wow that is truly amazing and looks incredible ....I guess we will have to have one of those next...

As always from you guys - looks killer! :thumbsup:

Thats awesome. Well done! :thumbsup:

Beautiful

Very nice looking stuff. IS that a 9" ford center section?

Man that is slick! Any info on hp ratings?

Most impressive! Have you guys done some testing, Test car? WOW! Beautiful work, I got to have one for my 65 gto project.

Rich

Its not too late to put one under that Mustang!:lol:

Yes, it is an aluminum 9" Ford center, C6 Vette Spindles, fabricated control arms.

We are going to offer 3 configurations based on the axles and CV rating. 600 HP, 1,000 HP, and 1,400 HP. Ford 9" center sections can be built accordingly. The stub axles are 31 spline or 35 spline. There are not a lot of options currently for the 35 spline in a street application, but several companies are developing a tru-trac type posi for a 35 spline axle that should be out by the end of summer.

We have not done any real world testing just yet, but have spent a solid 6 months of time on the computer going through suspension analyzing software. Two of the first production units are currently going under test cars that will be on the road very shortly. We are installing a chassis under a 66 Chevelle for a customer, and building a test car for ourselves. We currently have the IRS in both 64-67 and 68-72 Chevelle (and GTO) chassis as well as 1st and 2nd gen Camaro Chassis, and Challenger/Cuda Chassis. Mustang chassis are next on our drawing board to incorporate the IRS into.

X2:thumbsup:

A second gen Camaro application would be pretty cool.

Wow. I've said it before and I'll say it again. I need to hit the lottery. Nice looking chassis. Great job.:thumbsup:

What are thoughts on exhaust/tail pipe routing? Dumps? Is there enough room under the center section?

Thanks Rich

Rich,
The crossmember has two recesses in it to allow for 3" exhaust to pass above the axle. There are holes there for an exhaust mount that we are going to offer as an option. We are going to be starting on the exhaust for chris's 66 chevelle in the project section. I'll get a few pics posted as we get there.


http://i563.photobucket.com/albums/s...le/RearIRS.jpg

What is the track width on the rear? Looks awesome:thumbsup:

This is a really cool way to get IRS in side a muscle car.
Tim Bruning has done a similar set up before at SAR. SAR used more GM Facotry components. There hasn't been any true hard testing of the system. Show car type stuff.
Lets get some real world testing!!

http://www.stevesautorestorations.co...CN4753-750.jpg
http://www.stevesautorestorations.co...AD_010_750.jpg

Too nice..................................
 

..............................too nice to put a body on that work of art!

Thanks, the track width is 58.75" which will end up at 59" with brakes. We had a lot of discussion about track widths and possibly going narrower to get a deeper lip on the rear wheels, but decided on maintaining the optimal geometry and performance rather than sacrifice that for looks of the rear wheel. We designed it to be considerably narrower than a stock C6 Vette IRS. Depending on the car, you should be in the 6" - 9" back space range on a 12" wheel.

We are working to have Chris's 66 out for the Motor State Event with the IRS and we will have a 2nd gen of our own shortly behind that.

SAR definitely does some top notch stuff. We looked at the stock C6 components and saw a lot of room for improvement. By building our own conrtol arms and cradle system we were to make several improvements over a stock C6 IRS.

We have increased camber gains in roll compared to stock C6. There is 1 degree of negative camber gain through 1" of compression. This makes sure your tires never gain positive camber (like a stock C6) during cornering, losing traction/grip.

We were able to closely match camber gains to that of our front suspension which will yield a much more balanced and predictable car

Upper and lower control arm mounting points are pitched to give your vehicle 55% anti-squat, NO OTHER IRS OFFERS THIS, (Anti-squat will make your tires plant harder to the ground to help with acceleration and traction out of corners and from a launch)

We were also able to stand up the coilovers drastically over what is possible on a stock C6 arm giving more desirable a motion ratio.

Our upper control arms are also easily adjustable so caster/camber can be adjusted with shims while at the track.

Thanks... we were debating running just a roll cage and a seat (no body) for a demo car. :lol:

Have any one came to you for making a chassis for a g-body car?

We have had several people ask about a G body chassis, but haven't had anyone seriously step up to the plate yet. If you are interested, we can build you one as a custom chassis.

Can you describe the details on the Mopar E body chassis please?

Is the design like the Schwartz chassis where the body sits on the frame with minor cutting of the unibody?

Photos would be nice! :hail:

Beautiful pieces.

thanks
Darren

If I had the money, I will be all over it.

You need a 1st gen Camaro for a guinea pig? Maybe we can work something out :unibrow: After all, I am only about 45 minutes up the road...

Thanks. We are just finishing 2 chassis for 70 Challengers right now. I will start a new thread on them next week when they are completed. It is a true full chassis design, unlike others that you have mentioned. We did not see that you could gain any additional strength going that route. It also leaves the car sitting rather high for our liking. Our chassis will require cutting the passenger floor out of the car, but we have deigned an angled inside frame rail and dropped center crossmember that allows you to build a drop floor in the car since these are tight on head room.

Van, tempting.... but we are gonna have to pass.:_paranoid We currently have a 69 in the shop tht we are starting a full build for a local customer using this set up, and we will be building a 70 very shortly.

Irs
 

Great looking setup, any pricing worked out yet.
I'de like to run the IRS in one of your Fast Track frames to suit Gen 1 68 Camaro.

Any ideas on how much metal work will need to be done in the rear seat and trunk area.

Great work as always.

John:thumbsup:

Thanks John!

On the Chevelle, all that was needed was to extend the section of the floor above the rear end back a few inches before dropping off to form the trunk well. It appears that a Camaro will need the same modification.

This was a pretty simple sheet metal filler piece we made. The additional room is actually only needed for frame rail clearance.
http://i563.photobucket.com/albums/s...cture18421.jpg

I didn't understand...is the 69 getting a full chassis under it, or is the Camaro getting just the IRS in the back?

Do you plan on building a rear kit for the first gen?

David

Very very nice. How much?

Any pics of the 69 install? Is it getting the full frame of just the IRS?

Any pictures or info on a 2nd gen camaro install? also can you PM me a ballpark price for the system?

how is the adjustability on the camber/caster on the rear? awesome design, its about time these muscle cars get away from that solid rear end BS

Sorry to everyone for the delays in responding. We will be updating our vendor specific section this week and next week to showcase all of our products including pricing. Our web site is just finally getting updated and are just waiting on a few final components to go live. The site has really been completely re-designed with a lot more pictures and information on our chassis as well as updated builds going on in the shop.

We will be starting a build thread shortly on the 69. it is a pretty unique build and is getting a lot more than our standard chassis.

We are just starting the chassis build on the 2nd gen after a breif pause to wrap up a few other items in the shop. We should be back on that shortly and will post pics for that too.

The caster/camber is completely adjustable through shims where the control arm bolts to the crossmember.

New Addition!!!!!
 

The Fast Track IRS is now available on our popular 1955-57 Chevy chassis!

Stay Tuned for more fully independent Fast Track chassis in the upcoming weeks. First and Second Gen Camaros are completed along with C1 Corvettes!

http://i563.photobucket.com/albums/s...rf/cutout1.jpg

http://i563.photobucket.com/albums/s...ture221266.jpg

http://i563.photobucket.com/albums/s...ture221257.jpg

http://i563.photobucket.com/albums/s...ture221259.jpg

Simply Awesome !!!

Yeah but would it fit the Nomad body -- which is slightly different than all the others?

Awesomeness by the way!

Thanks Marty!

Greg, it will fit the Nomad as well. The only issue is that you must remove the spare tire well and you can not use the stock nomad gas tank, which is generally thrown out anyways. We have a stainless tank that fits between the rails and can still use the stock filler location. The spare tire well is only big enough to carry spare brake rotors anyways and is generally replaced with a smooth floor. The nomad also has an additional body mount or two (Don't remember exactly off hand) that we have located in our jigs for when we build a Nomad chassis.

I know a certain turquoise and ivory nomad that could use one of these!:unibrow: