Give me tips on launching a IRS!!

[99stanger]

Well I hope you just knocked on wood after that post

 

[IronTerp]

So what exactly is "it" that breaks the halfshafts and such? Is it more so the wheelhop or is it the shock of the grabbing of the tire? Are there any people on this board that have snapped a halfshaft running an et bias ply tire? I am wanting to know because I myself will be running et street slicks this year and I am hoping the irs will hold up with just an iirs brace.

It's the stiffness of the sidewall of a street tire or drag radial that "re-transferes" a good deal of the torsional forces from the drivetrain to the tires and back to the drivetrain. With a softer sidewalled tire, the tire itself will absorb a bit of these forces and not transfere it back through the drivetrain. Make sense?

I have broken 2 half shafts on drag radials and 0 on slicks.......

 

[TheDarkness03]

It's the stiffness of the sidewall of a street tire or drag radial that "re-transferes" a good deal of the torsional forces from the drivetrain to the tires and back to the drivetrain. With a softer sidewalled tire, the tire itself will absorb a bit of these forces and not transfere it back through the drivetrain. Make sense?

I have broken 2 half shafts on drag radials and 0 on slicks.......

so in a sense, it's almost safer to run full slicks than drag radials at a track?

 

[Senkak]

so in a sense, it's almost safer to run full slicks than drag radials at a track?

absloutely!!!
The slicks absorb the initial hit and transfer less shock to the drive train.
Also slicks almost never wheels hop.
Here is a pic of my rear tire at launch.

-

 

[TheDarkness03]

wow i never knew that! i was always under the impression that the harder your car hooked, the more stress is put on the drive train, thus more parts breaking. :idea:

 

[Senkak]

wow i never knew that! i was always under the impression that the harder your car hooked, the more stress is put on the drive train, thus more parts breaking. :idea:

This is actually true but if we can lauch harder, hook with less shock to the drive train the better.

 

[TheDarkness03]

absloutely!!!
The slicks absorb the initial hit and transfer less shock to the drive train.
Also slicks almost never wheels hop.
Here is a pic of my rear tire at launch.

-

thats quite a pic there :thumbsup:

i was always kinda afraid to buy slicks...but now i think i may need some in the near future epper:

 

[IronTerp]

Here's one of mine:

 

[03Cobra1979]

Here's one of mine:

Sick ass picture! I made it my desktop.

 

[Senkak]

Here's one of mine:

That is a great pic.
I want to see a pic of your car with air under the front tires!!!



-

 

[Smacked_in_ATL]

Once you goto the track with DOT slicks or slicks, you'll never go back to a DR, TRUST ME!

I dropped a full second on my 1/4 time going from street tires straight to ET Streets with no other mods. 13.3 to a 12.3 - Stock pulley!

 

[IronTerp]

I want to see a pic of your car with air under the front tires!!!

Gonna have to raise my launch rpm to 6,000 for that one Rick! Here's one that was getting up there fairly well.....

 

[P49Y-CY]

Gonna have to raise my launch rpm to 6,000 for that one Rick! Here's one that was getting up there fairly well.....

:rockon: awesome! those 28's look sick

 

[Mr Patience]

I have to agree with all that say slicks are the #1 choice for the IRS. I made over 60 passes this past summer with a 5000 - 6000 rpm launch (1.61 - 1.65) each time and no issues.

 

[Antex]

What everyone said - rev 'er up, let 'er rip and hold on for the ride. 0 half-shaft breakage - over 250+ passes on Slicks/ET streets. 1 half shaft breakage on DR's...

 

[Silver o1]

I have to agree with all that say slicks are the #1 choice for the IRS. I made over 60 passes this past summer with a 5000 - 6000 rpm launch (1.61 - 1.65) each time and no issues.

You made those passes on a 99 irs?

 

[Mr Patience]

You made those passes on a 99 irs?

03/04 diff and shafts.

 

[Mr Patience]

You made those passes on a 99 irs?

Double post

 

[Silver o1]

Anybody have any experience launching 01 cobra on 17


























































































Anybody have any experience launching a 01 cobra on 17" et streets with just a billetflow brace?




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