Ford 9" IRS in a C3
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
I'm not saying live axle cars are bad handling, but a parallel four link with a diagonal link designed for drag racing is not the best handling suspension. Now if you have a non-parallel 4 link or 3 link with a watts-link to control the role center location and height its a whole other story (what most 5.0 fox body's run).
By the way I have a older Cutlass with a drag racing suspension, a Mustang with a 3 link/watts link setup, and my C3 with IRS. They all have their benefits and act somewhat different. Not slamming a drag racing suspension at all, love it for the car's purpose and wouldn't want anything different under the Cutlass.
I know direhrd's car has high HP and is fairly fast in a straight line (~10 sec 1/4?), and I'm not even sure why that is even a point in a suspension thread. I run with alot of cars that have more HP than me, pass me all the time on the straights, ... no tears here
.
By the way I have a older Cutlass with a drag racing suspension, a Mustang with a 3 link/watts link setup, and my C3 with IRS. They all have their benefits and act somewhat different. Not slamming a drag racing suspension at all, love it for the car's purpose and wouldn't want anything different under the Cutlass.
I know direhrd's car has high HP and is fairly fast in a straight line (~10 sec 1/4?), and I'm not even sure why that is even a point in a suspension thread. I run with alot of cars that have more HP than me, pass me all the time on the straights, ... no tears here
.
Former Vendor
Joined: Jan 2016
Posts: 83
Likes: 4
I'm not sure if we will have a display rear end there but I will be running the 48hr car at the Autocross so you can look at it.
Drifting
Joined: Jul 2002
Posts: 1,995
Likes: 110
From: Garland Texas
Former Vendor
Joined: Jun 2012
Posts: 100
Likes: 8
If anyone is going to the NSRA Street Rod National's this coming weekend in Louisville, Ky, Chris will be running the 48 Hr Corvette with this new 9" IRS under it. NSRA is holding their first ever autocross at the Nationals in Louisville this year. Should be a great time...and potentially lots of run time. NSRA has recently opened up their year break to vehicles 30 years old or older. So if you have an 86 or older Corvette [or any other car]...bring it on out.
Former Vendor
Joined: Jun 2012
Posts: 100
Likes: 8
BTW...we will also be running the Corvette at the following events this fall:
SCCA CAM Challenge - Peru, In. - Aug. 12-14
LS Fest - Bowling Green, KY - Sept. 9-11
Goodguys Ft. Worth - Sept30-Oct 2
Goodguys Bowling Green - Oct 14-16
Goodguys Scottsdale - Nov 18-20
SCCA CAM Challenge - Peru, In. - Aug. 12-14
LS Fest - Bowling Green, KY - Sept. 9-11
Goodguys Ft. Worth - Sept30-Oct 2
Goodguys Bowling Green - Oct 14-16
Goodguys Scottsdale - Nov 18-20
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Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
Are you intending to use the factory rubber cushions between the x-member and frame, or have you considered anything else like polyurethane or solid bushings to minimize deflection?
Drifting
Joined: Aug 2015
Posts: 1,939
Likes: 477
From: NSW, Australia
C3 of Year Finalist (track prepared) 2019
Looks like a great setup! I find it curious that in the installed pic you have the strut rods in the highest holes for what appears to be a lot of camber gain? Yet most people lower those pivot points to reduce camber gain?
Former Vendor
Joined: Jan 2016
Posts: 83
Likes: 4
I'm running polyurethane in the test car. We will probably look into alternative material.
Former Vendor
Joined: Jan 2016
Posts: 83
Likes: 4
This car is a track car so we want the camber gain. I also effects roll angle height.
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
1500.00 for the 4 link and shocks then You still need the straight axle and 9" carrier about 1800.00 , axles and berrings 350.00
3650.00 for all fresh parts , with a tru track and 4.11 .
I am not down playing the set up in this topic and may have considered it if it was available last winter ! Mater of fact I know only 1 other company making this set up and its like 12,000.00 or more..
I am curious what this set up cost less install
3650.00 for all fresh parts , with a tru track and 4.11 .
I am not down playing the set up in this topic and may have considered it if it was available last winter ! Mater of fact I know only 1 other company making this set up and its like 12,000.00 or more..
I am curious what this set up cost less install
Drifting
Joined: Aug 2015
Posts: 1,939
Likes: 477
From: NSW, Australia
C3 of Year Finalist (track prepared) 2019
Very very very nice! And not an overly unreasonable price. Can it be used with a leaf spring, or only with coilover setups? Is the diff, or more importantly the inner mounts for the half shafts, mounted higher in the chassis than stock (to allow better geometry when running low)? Any floor modification required?
Last edited by Metalhead140; Sep 13, 2016 at 09:02 PM.
Former Vendor
Joined: Jan 2016
Posts: 83
Likes: 4
Can it be used with a leaf spring? It is not set up for the leaf. if you are a good fabricator you could make a mount.
coilover setups? It appears it will work with most coilover kits
Is the diff, or more importantly the inner mounts for the half shafts, mounted higher in the chassis than stock (to allow better geometry when running low)? With the height of the axles in the 9" we could not move it any higher in the chassis. I believe it is 1/2 inch higher then stock
Any floor modification required? Floor no, left battery box needs the corner trimmed off depending on 3rd member this varies.
coilover setups? It appears it will work with most coilover kits
Is the diff, or more importantly the inner mounts for the half shafts, mounted higher in the chassis than stock (to allow better geometry when running low)? With the height of the axles in the 9" we could not move it any higher in the chassis. I believe it is 1/2 inch higher then stock
Any floor modification required? Floor no, left battery box needs the corner trimmed off depending on 3rd member this varies.