GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Not to rehash the IRS vs SRA

Old Feb 24, 2006 | 11:23 PM
  #1  
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I was under the impression from the anti solid rear axel crowd, only the SRA has wheel hop. What about this z06 then at the strip:
http://forums.corvetteforum.com/showthread...60&forum_id=100
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Old Feb 24, 2006 | 11:50 PM
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The IRS is less desirable for the drag strip. It's better on bumpy/curvy roads.
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Old Feb 24, 2006 | 11:56 PM
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<div class='quotetop'>QUOTE(don_w @ February 25, 2006, 12:53 AM) Quoted post</div><div class='quotemain'>
The IRS is less desirable for the drag strip. It's better on bumpy/curvy roads.
[/b][/quote]

That's honestly a myth. IRS isn't bad at the strip, just ask the Supra boys. The Cobra IRS is very poorly designed and gets a bad wrap.
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Old Feb 25, 2006 | 10:27 AM
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<div class='quotetop'>QUOTE(max2000jp @ February 25, 2006, 1:59 AM) Quoted post</div><div class='quotemain'>
That's honestly a myth. IRS isn't bad at the strip, just ask the Supra boys. The Cobra IRS is very poorly designed and gets a bad wrap.
[/b][/quote]
Yeah, Right, Sure [img]style_emoticons/<#EMO_DIR#>/lol.gif[/img]
This happened on the cars 2nd run down the track.
There was a little wheel hop on the first run but he didn't back out of it.
As soon as he launched on his second run the rear end exploded.
The only mod to the car was a tune. It was even running factory tires.
This isn't the first C6 to leave the diff on the track either.

Manufacturers are using band-aid solutions such as torque limiting software instead of designing parts that will handle the output of the engine. This is why we see so many nearly stock cars leaving parts down the track.


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Old Feb 25, 2006 | 10:35 AM
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<div class='quotetop'>QUOTE(thump_rrr @ February 25, 2006, 11:30 AM) Quoted post</div><div class='quotemain'>
Yeah, Right, Sure

The only mod to the car was a tune. It was even running factory tires.
[/b][/quote]

Something was defective in that rear end. I can probably find some SRA pics too if I looked real hard. There are Supra's in the 8s on the stock rear.
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Old Feb 25, 2006 | 10:44 AM
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<div class='quotetop'>QUOTE(max2000jp @ February 25, 2006, 12:38 PM) Quoted post</div><div class='quotemain'>
Something was defective in that rear end. I can probably find some SRA pics too if I looked real hard. There are Supra's in the 8s on the stock rear.
[/b][/quote]

I didn't have to look for the pics since I am the one who took them.

This happened on the cars 2nd run down the track.
There was a little wheel hop on the first run but he didn't back out of it.
As soon as he launched on his second run the rear end exploded.
The only mod to the car was a tune. It was even running factory tires.
This isn't the first C6 to leave the diff on the track either.

Manufacturers are using band-aid solutions such as torque limiting software instead of designing parts that will handle the output of the engine. This is why we see so many nearly stock cars leaving parts down the track.
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Old Feb 25, 2006 | 10:57 AM
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<div class='quotetop'>QUOTE(thump_rrr @ February 25, 2006, 11:47 AM) Quoted post</div><div class='quotemain'>
I didn't have to look for the pics since I am the one who took them.

This happened on the cars 2nd run down the track.
There was a little wheel hop on the first run but he didn't back out of it.
As soon as he launched on his second run the rear end exploded.
The only mod to the car was a tune. It was even running factory tires.
This isn't the first C6 to leave the diff on the track either.

Manufacturers are using band-aid solutions such as torque limiting software instead of designing parts that will handle the output of the engine. This is why we see so many nearly stock cars leaving parts down the track.
[/b][/quote]

I've got a friend whom sprays his C6 and another friend whom has a 470+rwhp C5. Neither have had problems with the diff. IRS's get a bad wrap in the drag racing crowd, especially amongst Mustang guys. The Cobra IRS suspension was poorly designed and implemented in a chassis never designed to have one. Again, I can post numerous links of 8,9,10 second Supras running IRS rears.
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Old Feb 25, 2006 | 12:03 PM
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<div class='quotetop'>QUOTE(max2000jp @ February 25, 2006, 12:00 PM) Quoted post</div><div class='quotemain'>
I've got a friend whom sprays his C6 and another friend whom has a 470+rwhp C5. Neither have had problems with the diff. IRS's get a bad wrap in the drag racing crowd, especially amongst Mustang guys. The Cobra IRS suspension was poorly designed and implemented in a chassis never designed to have one. Again, I can post numerous links of 8,9,10 second Supras running IRS rears.
[/b][/quote]


Yeah I bet those supras are all making 1000+ to the wheels too. Everyone knows the downfall of supras when drag racing is their suspension. This is why most supras are roll race cars only. If they put a proper suspension in those cars they'd run a full second faster. Easy.
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Old Feb 25, 2006 | 12:18 PM
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<div class='quotetop'>QUOTE(Shifty @ February 25, 2006, 1:06 PM) Quoted post</div><div class='quotemain'>
Yeah I bet those supras are all making 1000+ to the wheels too. Everyone knows the downfall of supras when drag racing is their suspension. This is why most supras are roll race cars only. If they put a proper suspension in those cars they'd run a full second faster. Easy.
[/b][/quote]

Umm do a bit of research on Supras. There is a local guy in Chicago running low 8s@160+ in a street Supra. If you can drive the car, they launch pretty hard.
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Old Feb 25, 2006 | 12:37 PM
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<div class='quotetop'>QUOTE(max2000jp @ February 25, 2006, 1:00 PM) Quoted post</div><div class='quotemain'>
I've got a friend whom sprays his C6 and another friend whom has a 470+rwhp C5. Neither have had problems with the diff. IRS's get a bad wrap in the drag racing crowd, especially amongst Mustang guys. The Cobra IRS suspension was poorly designed and implemented in a chassis never designed to have one. Again, I can post numerous links of 8,9,10 second Supras running IRS rears.
[/b][/quote]

You are convinced that the IRS isn't a bad setup for the strip so you are trying to find facts that support your position.
Since you keep referring to the Supra IRS I'll respond to that first.

Is it possible that the Japanese simply designed a better product?
Maybe you can show me what the 2006 Supra looks like.
Oh I forgot they haven't produced that car since 2002 and it hasn't been imported to the USA since 1996.
The reason that car hasn't been imported into the USA since 96 was the lack of sales.
Why didn't they sell well in the USA? Because they were priced near $50,000

You are presented with proof that the C6 vette has wheel hop and you dismiss it as being a myth.
So since 2 of your friends don't have problems with their diffs over 2 separate generations of vettes therefore there cannot be a problem with current C6 differentials. [img]style_emoticons/<#EMO_DIR#>/lol.gif[/img] [img]style_emoticons/<#EMO_DIR#>/lol.gif[/img]

As far as the C6 goes there have been numerous failures. If you don't believe me go look at the vette forums. The rear end has been redesigned already for 2006 and carries a different part number.


I also have a friend running 9's in a Cobra with IRS without a hitch.
At the same time my other friend tore the rear out of his 04 Cobra with less than 1000 miles on it bone stock.

You are convinced that IRS is superior to a SRA so then Tell me which car won the Grand Am Cup Gran Sport championship last year?

Oh I forgot it was the SRA equipped Mustang that blew the IRS equipped BMW M3 off the racetrack. Therefore SRA is also superior to IRS on racecourses.
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Old Feb 25, 2006 | 12:42 PM
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<div class='quotetop'>QUOTE(max2000jp @ February 25, 2006, 1:21 PM) Quoted post</div><div class='quotemain'>
Umm do a bit of research on Supras. There is a local guy in Chicago running low 8s@160+ in a street Supra. If you can drive the car, they launch pretty hard.
[/b][/quote]

Yeah and how much power is he puttin down? 1500? 1600? Think of what numbers any stang would throw up with that kind of power and you'll see my point. Supra's are dyno queens, end of story.
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Old Feb 25, 2006 | 12:55 PM
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<div class='quotetop'>QUOTE(thump_rrr @ February 25, 2006, 1:40 PM) Quoted post</div><div class='quotemain'>


You are convinced that IRS is superior to a SRA so then Tell me which car won the Grand Am Cup Gran Sport championship last year?

Oh I forgot it was the SRA equipped Mustang that blew the IRS equipped BMW M3 off the racetrack. Therefore SRA is also superior to IRS on racecourses.
[/b][/quote]

Alright my conversation with you is done because of your pure ignorance. Pickup a racing book, read, and learn something about suspension design. Or better yet, go to a road course and see what real race cars use as suspensions. Heck, go look at the best handling production cars. Vehicles like the C6 Z06, GT3, Elise etc. If SRA was superior in the handling department, I am sure Porsche Motorsport or even Corvette race engineers would be using it. SRA superior to IRS on road courses?? LOL!


<div class='quotetop'>QUOTE(Shifty @ February 25, 2006, 1:45 PM) Quoted post</div><div class='quotemain'>
Yeah and how much power is he puttin down? 1500? 1600? Think of what numbers any stang would throw up with that kind of power and you'll see my point. Supra's are dyno queens, end of story.
[/b][/quote]

I've seen his car at the track and it's impressive. I wouldn't call a verified 8 second fully streetable car a dyno queen.

I did a bit of research, 1200 hp on the 8.45 pass. This is in a 3600lbs car with full interior, pwr steering, and a/c. The car has made 1500whp, but hasn't made any passes at that boost level that I can find.
http://100psi.com/marko-845.wmv
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Old Feb 25, 2006 | 12:55 PM
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<div class='quotetop'>QUOTE(max2000jp @ February 25, 2006, 1:49 PM) Quoted post</div><div class='quotemain'>
Alright my conversation with you is done because of your pure ignorance. Pickup a racing book, read, and learn something about suspension design. Or better yet, go to a road course and see what real race cars use as suspensions. Heck, go look at the best handling production cars. Vehicles like the C6 Z06, GT3, Elise etc. If SRA was superior in the handling department, I am sure Porsche Motorsport or even Corvette race engineers would be using it. SRA superior to IRS on road courses?? LOL!
[/b][/quote]

Ok I'm with you on that one. Properly designed IRS is kind in road racing. I don't know what that guy was thinkin.

I'm not really impressed by a car that makes 1200+ hp and only runs mid 8's. Sorry.
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Old Feb 25, 2006 | 01:07 PM
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<div class='quotetop'>QUOTE(Shifty @ February 25, 2006, 1:58 PM) Quoted post</div><div class='quotemain'>
I'm not really impressed by a car that makes 1200+ hp and only runs mid 8's. Sorry.
[/b][/quote]

And your car runs what? Give credit where it's due. The fast Mustangs in the 7s and 8s I've seen are fully stripped and weigh under 3000lbs. That's 600 lbs less than the car above. That makes a bit of a difference. Secondly, how many are fully streetable cars? I am guessing not too many.

For comparison, here is a guy that's a friend with a good friend of mine. Next time I see him I will ask him how much power the car makes truely. The article states 1100+. This is a truely streetable stang that pulled up and ran a best of 8.40.

http://www.musclemustangfastfords.co...s/0406mm_twin/
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Old Feb 25, 2006 | 01:20 PM
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<div class='quotetop'>QUOTE(Shifty @ February 25, 2006, 2:58 PM) Quoted post</div><div class='quotemain'>
Ok I'm with you on that one. Properly designed IRS is kind in road racing. I don't know what that guy was thinkin.

I'm not really impressed by a car that makes 1200+ hp and only runs mid 8's. Sorry.
[/b][/quote]
I was being SARCASTIC

The only point I was trying to make was that you can come to any conclusion you want if you try and find it using flawed data such as his 2 friends don't have any problem with their IRS equipped Vettes therefore they are good for drag racing.

My 05 Mustang GT is the first car I ever bought with a SRA. It is also the first North American Car I have ever bought in the 20 years I have been driving. I have made over 550 1/4 mile passes down the track this past summer alone. I don't think I would have done so with an IRS equipped anything.

Do I think SRA is better than IRS? NO
Would I have preferred IRS? YES
Would I have paid what i paid for the car if it had IRS? NO
Would it be as reliable at the drag strip if it had IRS? NO

It's like saying a garden shovel is better than a snow shovel. It's only better if you are digging a garden.
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Old Feb 25, 2006 | 01:22 PM
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I love IRS/SRA discussions [img]style_emoticons/<#EMO_DIR#>/popcorn2.gif[/img]

Guys, just please keep this from becoming a pissing match... I'm tired of having to clean up entire threads
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Old Feb 25, 2006 | 01:29 PM
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<div class='quotetop'>QUOTE(thump_rrr @ February 25, 2006, 2:23 PM) Quoted post</div><div class='quotemain'>


The only point I was trying to make was that you can come to any conclusion you want if you try and find it using flawed data such as his 2 friends don't have any problem with their IRS equipped Vettes therefore they are good for drag racing.

[/b][/quote]

And your picture of your friend blowing his dif isn't flawed data and therefore IRS is bad for drag racing? Go over to the GTO forums and CorvetteForum. It's not a common problem. A properly designed IRS can handle the power. heck there are C6 Z06 guys running mid-high 11's@125ish in bone stock vehicles. I've got a friend running mid 11s in a Twin Turbo 350Z(6 speed) and there are cars running even faster than that.
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Old Feb 25, 2006 | 01:51 PM
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<div class='quotetop'>QUOTE(max2000jp @ February 25, 2006, 2:10 PM) Quoted post</div><div class='quotemain'>
And your car runs what? Give credit where it's due. The fast Mustangs in the 7s and 8s I've seen are fully stripped and weigh under 3000lbs. That's 600 lbs less than the car above. That makes a bit of a difference. Secondly, how many are fully streetable cars? I am guessing not too many.

For comparison, here is a guy that's a friend with a good friend of mine. Next time I see him I will ask him how much power the car makes truely. The article states 1100+. This is a truely streetable stang that pulled up and ran a best of 8.40.

http://www.musclemustangfastfords.co...s/0406mm_twin/
[/b][/quote]

Don't even start the "your car is slower so bow down to everything faster" crap. I'm sorry I'm only 18 and I don't have thousands of dollars to drop on my car. I will be running 11's by the end of the month which looks a lot faster than you seem to be running.

I've got a vid of a single turbo streetable cobra running 7.97.

http://www.racingsouthwest.com/~buffhomer/Keenan797.wmv

Why don't you stop running your mouth for all your "friends" and let them speak for themselves huh? Stop being a fan boy.
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Old Feb 25, 2006 | 01:54 PM
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<div class='quotetop'>QUOTE(max2000jp @ February 25, 2006, 3:32 PM) Quoted post</div><div class='quotemain'>
And your picture of your friend blowing his dif isn't flawed data and therefore IRS is bad for drag racing? Go over to the GTO forums and CorvetteForum. It's not a common problem. A properly designed IRS can handle the power. heck there are C6 Z06 guys running mid-high 11's@125ish in bone stock vehicles. I've got a friend running mid 11s in a Twin Turbo 350Z(6 speed) and there are cars running even faster than that.
[/b][/quote]
Here is another one on a C5 from the corvette forums this week.
You are the one who is claiming it's a myth.
I don't see anyone else taking your side

http://forums.corvetteforum.com/showthread...al&forum_id=103
http://www.lgmotorsports.com/catalog/produ...roducts_id=1461


It's just a common a problem for every vehicle driven down a dragstrip.
It is simply more common for IRS equipped vehicles because the components are more fragile.
The rear axle on my Mustang GT is also used on an F150 pickup.
Try installing the rear end of a Vette in a silverado. [img]style_emoticons/<#EMO_DIR#>/biggrinjester.gif[/img]


The problem is the WHEEL HOP not the horsepower. Production cars use soft bushings such as rubber or hydraulic filled mounts which can lead to wheelhop which can cause disasterous results.
It is obvious that anyone building a 1000+HP car is not driving on factory suspension.
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Old Feb 25, 2006 | 02:19 PM
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<div class='quotetop'>QUOTE(Shifty @ February 25, 2006, 3:54 PM) Quoted post</div><div class='quotemain'>
Don't even start the "your car is slower so bow down to everything faster" crap. I'm sorry I'm only 18 and I don't have thousands of dollars to drop on my car. I will be running 11's by the end of the month which looks a lot faster than you seem to be running. [/b][/quote]
[img]style_emoticons/<#EMO_DIR#>/lol.gif[/img]
<div class='quotetop'>QUOTE(Shifty @ February 25, 2006, 3:54 PM) Quoted post</div><div class='quotemain'>
Why don't you stop running your mouth for all your "friends" and let them speak for themselves huh? Stop being a fan boy.[/b][/quote]
[img]style_emoticons/<#EMO_DIR#>/thumb.gif[/img]
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