Built IRS should be an option.
Does your car have the Stock IRS or SRA
- Thread starter nextime
- Start date
Agreed!:beer:
IRS here.
Death to all DROIDS!
Death to all DROIDS!
I figured there would be more IRS than SRA. I guess if SRA was that good the numbers would be reversed.
Glad Ford is going back to IRS for all Mustangs in 2015!
Glad Ford is going back to IRS for all Mustangs in 2015!
SRA here, if setup correctly sra can be pretty comfy and alot stronger. Now i will say the irs is ultimately more comfy to ride in but i enjoy the huge weight loss and the fact i dont have to worry every time i drop the clutch at the strip. I still have the irs in my vert and its nice also.
04 Mach 1 SRA here. Got it for $250 and only have about $600 in it. Miss the IRS but would have cost way more to upgrade it. I am happy with my SRA as I am more straight line than corner carving anyway.
There are more IRS... because that's what our cars came equipped with, not necessarily because its "better." :dw:
Awesome traction, buttery smooth burnouts, zero wheel hop at any time....but it is a tad noisier. Even with the FTBR kit ive driven an IRS car that still hopped pretty bad and I couldnt deal with that. Knowing that I pretty much cant break the rear is a great feeling.
SRA w MM torque arm, MM lower control arms, MM pan hard bar, and bilstein coil overs here
Sent from my DROID BIONIC using Tapatalk 2
Sent from my DROID BIONIC using Tapatalk 2
I have a SRA in my vert, best move I've made since I'm always drag racing it. My coupe still has the IRS.
How much weight loss swapping to a SRA for all of you who say they can feel the weight difference?
Should be around 110lbs give or take
IRS with Full Tilt Boogie Racing kit.
Also swapped out the aluminum diff with a '92 T-Bird Super Coupe cast iron diff. It is a street driven vert so I was not that much concerned with weight, just bulletproofing.
This pic is before painting it with hi temp aluminum colored paint. It looks factory.
While I was at it, she got 3.73 gears.
Also swapped out the aluminum diff with a '92 T-Bird Super Coupe cast iron diff. It is a street driven vert so I was not that much concerned with weight, just bulletproofing.
This pic is before painting it with hi temp aluminum colored paint. It looks factory.
While I was at it, she got 3.73 gears.
IRS with Maximum Motorsports race grip package, DSS level 5 half shafts, 3" ARP extended studs, Billetflow IRS brace etc. etc. = Awesome IRS.
!! Hell ya
I know these cars are nose heavy to start. Would love to lose some weight but not all in one bad spot to lose it from. I would really like the piece of mind of an Sra though
IRS is heavier but its a different type of weight without as much consequence, unsprung vs sprung weight. Reducing unsprung weight hugely impacts confidence and stability, turn in etc.
Honestly, the factory motor can be recessed back several inches, this alone helps weight balance and chassis mods like kmember/a-arms with light weight wheels, and so forth are better ways to trim weight and will actually help weight distribution, launch, cornering dynamics etc.
I'd be willing to bet that an IRS cobra would pull faster laptimes than the same cobra with an sra swap even though the sra car would be lighter/"more planted on corner exit" assuming similar states of build with the rear suspensions (stock vs moddest or built up irs vs built up sra, don't nit pick the obvious please), exact same tires, brakes/pads etc, power et al just swapping rears.
I'd even bet it's not too drastic a difference at the drag strip. It's not like bone stock 2004 mustang gt's magically hook amazingly well, they need lower control arms, pan hard bars, 31 spine setups, etc etc to honestly hook a 1.50 or better. Obviously the newer 2011+ 5.0's are a different story but in general, a $1500 rear sra setup is usually not a fully built/stout sra, and for $1500, you can get ftbr's kit, diff cover, brace, etc, and so on which makes the IRS very robust. Either setup will need slicks/skinnies/ et al so I'm just comparing $1500 in drivetrain vs drivetrain.
People are right that fully built sra way out do stock irs cars in traction, launch, and durability but there are irs cobra's hitting 1.38's with full drag shocks/slicks setups so honestly I think it's just that a lot of dedicated drag racers would rather take a sure route via sra then gamble/try learning irs setups.
No harm/foul, we're all pretty tech savvy with our cars and a lot of sra guys are very happy as they use the car more at the drag strip. The bunk about absolutely terrible ride etc is not true but yes an sra will be a little worse on broken pavement but remember that a built sra handles that better than a stock sra via much improved geometry/capability/dampening etc.
IMO, built IRS has loads of potential but sra is more proven:1979-now to test/tune vs 99-04(and upto now obviously by guys still using irs).
Both can be fast, IRS is a little better for handling, but not as great for drag, sra great for drag and still good for handling.
Sra American iron cars are no slouch
IRS cobra hitting 1.38's aren't slouches either
Honestly, the factory motor can be recessed back several inches, this alone helps weight balance and chassis mods like kmember/a-arms with light weight wheels, and so forth are better ways to trim weight and will actually help weight distribution, launch, cornering dynamics etc.
I'd be willing to bet that an IRS cobra would pull faster laptimes than the same cobra with an sra swap even though the sra car would be lighter/"more planted on corner exit" assuming similar states of build with the rear suspensions (stock vs moddest or built up irs vs built up sra, don't nit pick the obvious please), exact same tires, brakes/pads etc, power et al just swapping rears.
I'd even bet it's not too drastic a difference at the drag strip. It's not like bone stock 2004 mustang gt's magically hook amazingly well, they need lower control arms, pan hard bars, 31 spine setups, etc etc to honestly hook a 1.50 or better. Obviously the newer 2011+ 5.0's are a different story but in general, a $1500 rear sra setup is usually not a fully built/stout sra, and for $1500, you can get ftbr's kit, diff cover, brace, etc, and so on which makes the IRS very robust. Either setup will need slicks/skinnies/ et al so I'm just comparing $1500 in drivetrain vs drivetrain.
People are right that fully built sra way out do stock irs cars in traction, launch, and durability but there are irs cobra's hitting 1.38's with full drag shocks/slicks setups so honestly I think it's just that a lot of dedicated drag racers would rather take a sure route via sra then gamble/try learning irs setups.
No harm/foul, we're all pretty tech savvy with our cars and a lot of sra guys are very happy as they use the car more at the drag strip. The bunk about absolutely terrible ride etc is not true but yes an sra will be a little worse on broken pavement but remember that a built sra handles that better than a stock sra via much improved geometry/capability/dampening etc.
IMO, built IRS has loads of potential but sra is more proven:1979-now to test/tune vs 99-04(and upto now obviously by guys still using irs).
Both can be fast, IRS is a little better for handling, but not as great for drag, sra great for drag and still good for handling.
Sra American iron cars are no slouch
IRS cobra hitting 1.38's aren't slouches either
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^ You have a fair and balanced opinion. Probably the best reply I've ever read about this topic.
Thanks man, like a lot of things in life, there's two sides to a story and the truth. Both can be very good setups, the IRS can be built to be a little better for circuit/drift/street while the sra can be a little better for drag/mile/topspeed but obviously either can do 8/10th of the other. That last 2/10th is where they adhere to physical differences.
* I mention drift because sra or irs, its a moldable chassis and there's a pretty insane video of a ratted out 03 cobra (salvage title for the cringers) drifting with motorcycles up a circuit and snakey roads that made me think it'd be an awesome drift car/plus I mean Forza4 cobra r's rock for drifting!! Haha but seriously its logical that IRS suit's circuit work while sra suits launch/straight line better.
That video is "motorcycle vs car drift battle 2" or just search "cobra cop drift motorcycles. It's 8min and gets good around 3 minutes but its well produced and entertaining the whole way through
*They even show a reel of an '89 s13 (?) Flipping at the end.
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