Quote:
Originally Posted by David Pozzi
A Ford 9" with no floater and 14" rotors, 6 piston calipers weighs 195 lbs.
A Ford 9" with floater and 14" rotors and 6 piston calipers weighs 220 lbs.
To compare to the Morrison, you would need to know the weight of the shock mount bar, panhard bar, brackets, and 3 link equipment.
According to Morrison, their IRS is 30-40 lbs heavier total than a Ford 9" with suspension, but it has an even larger ring gear & is stronger. The added weight is low and to the rear which is the best place to add it if you have to add weight. The un-sprung weight drops from 150 lbs per wheel to 80 lbs assuming a 50 lb wheel and tire.
In terms of ride, IRS wins hands down, it's way way smoother riding & you will enjoy driving the car so much more on the street, it isn't funny.
In terms of autocross times, IRS will beat a stick axle with equal tuning time invested. How much? I don't know if it's a second faster, but somewhere close to that.
How much better on a road course? I don't know, but if it's a bumpy track the IRS will be faster, since lap times will be longer on a track, I think easily a second faster, maybe more, but I'm guessing. You will feel more confident going over rough sections of the track.
For a car to drag race, the stick axle probably has an edge in theory, more anti-squat could be used, but there are plenty of late model Corvettes doing pretty well at the drags.
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David you bring up a very good point that I didn't even consider in unsprung weight on the tires. I didn't even think of that! And also a lot of good input.
And I didn't know that the IRS was that light. I know a 9" can be a hefty chunk of weight.
David I know you guys have the A/M IRS in Marry's car is there any potential limits on rear tire size with the A/M rear clip?
Quote:
Originally Posted by Rick D
Kody, first I think you are off a bit on that $10K?? I think the A/M unit is almost $12K just for the unit and then if you can't install it yourself you have another $6-8K in labor to install it. Now again you will close to that to install most of the 3-4 link setups as well so more of a wash on the labor end.
As for the Roadster Shop setup your not just buying their IRS your buying a complete chassis but if you start adding up all the cost of ALL of your suspension its not that far off with the added cost of labor compared to installing the RS frame.
Now as far as the rest I have know idea but as most would say, what are your goals? Have fun look cool, or are you looking to be at the front of the pack?
I know your just kicking around the question but to think about for sure, but great topic for sure, especially with all the opinions we have today from a lot of great company's making awesome products!!
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Rick I know I came in a little low on the price, I just pulled a bare RS clip with no options and that was the price so I just threw that one up there lol.
As far as install, I'm building my whole chassis myself and plan on just buying the rear suspension as a "clip" doing it myself so I'm only looking at the parts prices.
Also what is every body's thoughts on a C6 IRS swap and using the trans axle?