60' times and the IRS - ModernCamaro.com - 5th Generation Camaro Enthusiasts
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post #1 of 14 Old 07-14-2009, 10:16 PM Thread Starter
 
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60' times and the IRS

So I was surprised to find that Chevy went with an IRS on this thing. I had a 2005 GTO putting down 450 at the wheels and far and away the IRS was the weak link. Couldn't hook without some serious suspension mods (and after rolling the fenders, and doing some cutting to get some decent rubber under it), then when it finally hooked, the rear grenaded. Couldn't take the power.

Any predictions as to how the rear on the Camaro is going to hold up as people start getting into the 500's and running 11's? Also, any idea how this thing hooks with some good drag radials, and stock suspension? Wondering if the gears, CV's, ets are as weak on this thing as they were on the GTO. I correct myself, the stock GTO underpinnings were great in stock form, with a stock car. Curious how the Camaro rear is going to hold up and hook.
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post #2 of 14 Old 07-15-2009, 07:34 AM
 
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Not really apple to apples, but I have a 2006 Dodge Charger R/T (5.7) W/IRS & W/drag radials I have run 12.0s on motor & 11.3s on juice. My 5.7 puts down 426 RWHP/460#RWTQ N/A, 555 RWHP on the juice.

Yes a solid axle is easier to hook up, but we (Charger, Magnum, 300C owners) are running as quick as high 9s for blown & sprayed strokers on the stock suspension W/upgraded halfshafts.

Good drag radials & a moderate stal convertor do the trick.

The weak link in our case has been the halfshaft spline @ the wheel hub.

After market halfshafts have cured that & the factory upgraded the outer spline in "09"

The old stcok halfshafts were good for low 12s/high 11s W/some care on the launch.

I have upgraded to an 8.8 Ford IRS setup from the Ford/Lincold SUVs.

It was a wash as far as $$$$ to install a 3.23 R&P, Aftermarket LSD & upgraded halfshafts in the Mercedes derived stock diff. The Ford unit makes replacemnt parts & upgrades much more cost effective.

So, in a nutshell, IRS does not automaticly prevent hooking up as long as the components can take the TQ.

Last edited by FormerGMemployeee; 07-15-2009 at 09:45 AM.
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post #3 of 14 Old 07-15-2009, 08:44 AM
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This has been addressed with the Camaro IRS.

It will still be costlier to do upgrades, but it's not going to be the same miserable experience as you had with the GTO.

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post #4 of 14 Old 07-15-2009, 09:52 AM
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The IRS on the Camaro is completely new, it's even a newer design than the G8's IRS.
While being very similar to the G8's (and based on that), it is stronger.

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post #5 of 14 Old 07-15-2009, 10:23 AM
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I'm quite glad that Chevy went with a IRS on the camaro. It provides a much smoother ride as well as much better handling on roadways which is where 95% of my driving occurs.

Obviously for the drag strip people are generally going to prefer a solid axle for maximum performance and strength, but hopefully the newly redesigned IRS on the camaro will prove to be more than adequate for the part time hot rodders. Anyone doing a pure Drag build are going to be rebuilding so much as it is that adding a solid rear supspension will just be par for the course.

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post #6 of 14 Old 07-15-2009, 11:38 AM
 
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The harsh part on most IRS rears is the wheel hop.

A good set of rear shocks like adjustable QA1s would prolly cure most hop.

Also the G8s have all kinds of upgrade bushing packages available now.

I don't see the Camaros having too many problems.
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post #7 of 14 Old 07-15-2009, 01:33 PM
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Quote:
Originally Posted by cobrakid View Post
The harsh part on most IRS rears is the wheel hop.

A good set of rear shocks like adjustable QA1s would prolly cure most hop.

Also the G8s have all kinds of upgrade bushing packages available now.

I don't see the Camaros having too many problems.
There is no wheel hop for the Camaro from what I have heard.

I believe the CTSV's and the GTO's hop problem was solved with asymmetrical axle replacements.

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post #8 of 14 Old 07-15-2009, 01:33 PM
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diameters that is....

2005 CTSV BLACK LS7 Clutch/Flywheel/Slave, Tick Speed Bleeder, Tilton Clutch MC, RevShift Bushings, Domestic V8 Solutions (shifter, 8.8 Diff conversion, srut tower braces, sub-frame connectors), SLP cats, no cags, xpipe, bullet mufflers, Volante, iPod dock, G-force tune; 379hp 381tq.

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post #9 of 14 Old 07-15-2009, 02:03 PM
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Quote:
Originally Posted by 54inches View Post
There is no wheel hop for the Camaro from what I have heard.
During my drive of the SS at Carlisle, it was very smooth in putting the power down. Driving my GTO the same way would have induced bone-jarring hop.


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post #10 of 14 Old 07-15-2009, 06:50 PM
 
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...oh sorry .. "wheel hop" I have it in the G8 under certain conditons...assumed the Cam would too.
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