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Old 07-02-2007, 02:02 PM   #1
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Default Stupid Stupid Stupid IRS

Oh who can help me? I'm running 13psi on my cobra with just the front lowered. The car doesn't grip up at all it's embarrasing, I took it to the track and only ran a 13.3 at best. The car will roast the tires all the way through first and pretty much second untill it starts to wheel hop. I was thinking about buying the hard launch bar and urethane bushings from rpmoulet, but will these really help? and are there other mods out there for the IRS? Other then that, but what I don't want to do because I'm not planning on making this car into an all out dragster, was buying a solid axle rearend. I'de like to through some slicks on the car and take it to the track now and again, but I know it won't grip and slicks will just rip the axles in half. For all you 11 sec peeps are you running the IRS? Or did you just swap it out?
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Old 07-02-2007, 02:09 PM   #2
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I used to cut 1.6-1.7 60' times on the IRS with drag radials... and ran pretty consistent 11.6-11.9s.

What kinda tires are you running? A good tire makes a HUGE difference.
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Old 07-02-2007, 02:10 PM   #3
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Biggest issue you never mentioned is tires... what are you running? A good set of MT DR's or BFGs may solve all your problems.
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Old 07-02-2007, 02:14 PM   #4
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I'm running michelin pilots $430.00 a pop. they got ubber sticky but didn't help. I even dropped the psi. won't drags cause me to break somthing important when everything in the rear is stock?
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Old 07-02-2007, 02:18 PM   #5
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Poo... nice for street driving.

All I have is a BF IRS brace and DR's... of course I just finally broke a half shaft after 100+runs. End of the day... wheel hop or not, eventually something will break. I would rather do it having fun and succeeding than spinning and being miserable about it.
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Old 07-02-2007, 02:21 PM   #6
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If you're gonna go to the dragstrip and want to get decent times you're gonna need a decent tire, there's no way around it. Michelin Pilots will never be anywhere near as sticky as a set of Micket Thompson DRs, ET Streets or slicks.

I also didn't hear you mention a Billetflow IRS brace. Without that, your half-shaft days are probably numbered anyway.

You can:

a) not drag race it and keep your IRS happy
b) drag race it without a decent tire and consistently fall way short of the cars' potential
c) bolt on a sticky tire and run some representative times (albeit with risk to the stock half-shafts)

It's all a trade off.
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Old 07-02-2007, 02:21 PM   #7
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So you guys don't know anything about the irs mods?
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Old 07-02-2007, 02:23 PM   #8
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Originally Posted by TwoTonedRoush View Post
So you guys don't know anything about the irs mods?
They're not gonna get you to hook at the dragstrip without a sticky tire.

LOL - Looks like almost the entire CSVTDRRRT has spoken.
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Old 07-02-2007, 02:24 PM   #9
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Im curious as to why you just lowered the front end? I ask that because what it sounds like it happening is your are nailing it and in doing so your ass end is coming down and all that interia is coming back up causing your ass end to pop up more than usual and spin the tires? I had both front and rear lowered with springs and it helped to balance out the car so when i gun it the whole thing kinda squats and comes back together and Im off. But like the guys said tires make these cars. Im too cheap to run DR's but I have a set of KDW's and for the most part we all spin thru 1st gear regardless but by the time I hit 2nd I have caught and im off
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Old 07-02-2007, 02:25 PM   #10
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Quote:
Originally Posted by TwoTonedRoush View Post
So you guys don't know anything about the irs mods?
The only IRS mods you need are the diff cover brace (to keep it from exploding) and some decent tires.
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Old 07-02-2007, 02:27 PM   #11
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the car came with just the front lowered, maybe the rear was lowered a bit but it doesn't look like it.
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Old 07-02-2007, 02:27 PM   #12
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+1 to the CSVTDRRRT Team.
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Old 07-02-2007, 02:29 PM   #13
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I'm running with Steeda Sport Springs, BF IRS brace, and MT stock size street radials and it was those tires that made the difference.

1st and 2nd were worthless with the stock F1s and GS-D3s. At 10mph on a hot day I can "mat it" and hook. I was never able to do that until I got the MT street radials.
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Old 07-02-2007, 02:30 PM   #14
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Lol I'm afraid to ask but what will a good set of aftermarket halfshafts run a guy now days.
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Old 07-02-2007, 02:30 PM   #15
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I have had both Mickey and Nitto's and they both work well. Mickey > Nitto
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Old 07-02-2007, 02:31 PM   #16
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Well grasshopper you need to get a better tire....

I remember back in the day ( like I am some old man ) when I first went to the track in Byron. I had an 2.76 upper, stock lower, Sutton Ford Tune, and a set of BFG Drag Radials.

I took off of the line and got a 12.95 and was pretty dissapointed. I got to talking to Wiked03, Flatliner, and GNXS. They asked what was your tire pressure???? I said ohh 32PSI.

I lowered that shiznit to like 16PSI and busted out a 12.00 my next run.

Get a real good tire, lower the PSI, and side step that clutch and you should be at least in the 12's.

There is a whole lot of folks making big power and getting great times while still using the IRS.

Wax on.....Wax off.....
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Old 07-02-2007, 02:37 PM   #17
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ok now that tires are my deal, what size? how wide can I go? Come this winter I think the IRS is gone anyway. None of you have tried the hard launch bar?
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Old 07-02-2007, 02:46 PM   #18
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Quote:
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None of you have tried the hard launch bar?
Nope.
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Old 07-02-2007, 02:50 PM   #19
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Quote:
Originally Posted by TwoTonedRoush View Post
So you guys don't know anything about the irs mods?
Not many have bothered with the hard launch kit. I'm pretty sure its made to eliminate wheel hop. If not many chime in and say they have it then it's prob not a product worth investing in.


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ok now that tires are my deal, what size? how wide can I go? Come this winter I think the IRS is gone anyway. None of you have tried the hard launch bar?

IMHO. I wouldn't worry about breaking a half shaft with a real good tire. That is my .02(as long as you don't get wheel hop. If it starts to hop get out of the gas right away)

Like they said above. You have street tires you'll never hook with that. Seat time seat time seat time is what it will take to get a good launch out of the IRS. I've had mine for 2 years and now I can do a half ass launch.

What size tire can you fit..

People fit Nitto 315 Drag Radials on the stock 9" rims. Some get away w/o rubbing some don't. I ran a BFG 315(they run a little larger than nittos) on a 10" wide rim and I didn't have any problems with rubbing. Only rubbing the inside of the fender well on hard right hand turns. EVERY CAR IS DIFFERENT. Wheel spacers and rolling the inside of the fender lip will stop the rubbing so you can fit a large tire in there.

This is what a 275 Mickey Thompson drag radial looks like on the stock 9" rims.


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Old 07-02-2007, 02:52 PM   #20
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Quote:
Originally Posted by TwoTonedRoush View Post
...I was thinking about buying the hard launch bar and urethane bushings from rpmoulet...
To answer your question, yes this will help, but at the end of the day will not solve your problem.

Take your cash and buy:
- BF IRS Brace
- MT or BFG drag radials, even on a set of rims... I think 01sleeper may have somthing for sale but not sure what tires are on there.

Have fun and enjoy it... if something breaks, then consider your next options.

- If you are lucky you may find someone to switch out IRS for solid.
- You can buy level 2's or level 5's, but you can also buy many stock one's for the price of those.
- a SRA properly set up can be some serious $$$$ and at the end of the day could break to.

Judgement call is yours, hope you enjoy yourself...
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Old 07-02-2007, 02:59 PM   #21
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ok now that tires are my deal, what size? how wide can I go? Come this winter I think the IRS is gone anyway. None of you have tried the hard launch bar?
Heres my $.02.... I will give you my recipe and just give you some food for thought...I run a set of 17inch BFG KDW's and most would say im nuts. I tried a set of DR's on and got 3000 miles out of them and still had spin issues on the stock suspension setup

First thing i did was get lowering springs front and rear to balance out the car...which caused the car to hook alot better.

Next I went with the Sub-Frame connectors which helped tremdously

Then I optd to go with the IRS Cradle bushings(huge help) and the IRS dif cover(so I dont blow out the rear)

I except the fact that I do really hook well in first gear but by the time i am into 2nd gear I have caught and Im on my way.

With that I agree that its all about the tires but Im not going to spend $$$$ on tires every 3-4 months in the process I like to drive my car more often than not so DR/Slicks are not the way to go for me. Alot of the other guys are more disciplined than I and can refrain for driving their monster all the time

Everyones giving there input sooo there you go
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Old 07-02-2007, 03:03 PM   #22
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...Next I went with the Sub-Frame connectors which helped tremdously...
Wow... I completely forgot about that part. I have full length MM, and yes that would be on the priority list as well.

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I except the fact that I do really hook well in first gear but by the time i am into 2nd gear I have caught and Im on my way.
You haven't raced me yet...
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Old 07-02-2007, 03:04 PM   #23
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You haven't raced me yet...
Come get some buddy

Street Tires Twin Screw vs Eaton Drag Radials
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Old 07-02-2007, 05:06 PM   #24
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All I can say is that Michelin Pilot Sports SUCK ASS!!! My BFG KDW2's are 100x's better. Your best bet is to find a set of extra rear wheels, slap on some M/T DR's and nail it like there's no tommorrow. Swapping half shafts will soon become as easy as opening your eyes.

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Old 07-02-2007, 05:55 PM   #25
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I'm running low 11's on my IRS, billet flow brace and MM diff bushings are my only mods, on a 315 MT DR. I've broke a axle...yea so what? You have a soild...guess what you brake stuff...Same shit different setups.

Don't waste your time on Level 2's or Level 5's they are all over priced junk. John could chime in here.

Get sum MT tires and a Billet flow diff brace and id call it a day.

Somehow I still don't have MM Subframe connectors..They are on the "to get list"...

CobraChris, your days are numbered on those 20K axles, im just waiting for the phone cal..

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