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Old 09-26-2011, 09:30 AM   #1
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IRS wheel hop issues.......

Hey whats up. I have an 01 Cobra convert. w/a few bolt ons. CIA, long tubes, o/r H pipe, some brand of cat back(was on there before I bought it, not labeled anywhere), 65mm t/b, short throw, 4:10s, black 03 cobra rims, and a saleen roll bar. And I'm going to compete at Mustang Nationals this coming wkend in Bowling Green, Ky. in the true street class. Think that this gen cobra is capable of pushing 13s or so in the 1/4. Which brings me to my issue, I've had the car for about 3mo now and have learned that on hard launch that this IRS wheel hops like a *****.

Any suggestions/remedy's that I don't have to buy to alleviate or at least subside this issue? While I'm on the topic, I'm running 275/40 series tires wrapped around a 17" rim, how high would you guys suggest over inflating the fronts to drag and how low would you suggest under inflating for the rears? And do you guys have any other suggestions that could help with my launches, passes, etc. this coming wkend?

Thus far in prep I've removed the front bumper supports and rear bumper supports, the trailer receiver(yes, the previous owner had a trailer receiver on it), and the spare tire assy. then come day before race day I'll be removing the pass seat. Just wanted to give you guys as much info to work with here.

Anywho, I look forward to hearing what you guys have to say, share, and express. You guys are always an awesome resource that I look forward to tapping.

PS
How much power do you guys think I'm making with all those bolt ons?
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Old 09-26-2011, 12:43 PM   #2
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I've learned over the few years I've had my 99 that the car hooks and pulls better times with everything still in the car. And I assume you have street tires on your car? I run the nitto nto5r drag radials on my car and have never wheel hopped with them on and I leave the tree 5k plus. Street tires to me hopped more than the dr's. I don't know of any tricks to fix that with out buying stuff but I have seen some wheel hop eliminator kits online like American muscle steeds and late model restoration for kinda cheap. And your car should be in the hi 12's I went 13 flats bone stock at sea level and it depends on how well u drive too good luck. Others will chime in as well
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Old 09-27-2011, 08:46 AM   #3
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Re: IRS wheel hop issues.......

the trick is to remove all the crappy rubber and upgrade a couple components here and there.

look into these guys they can help you every step of the way
Full Tilt Boogie Racing

I had wheel hop until I put stiffer springs/wider tires that seemed to solve most of mine.
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Old 09-27-2011, 10:57 AM   #4
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I have the complete Full Tilt Boogie bushing kit on my IRS conversion. I can't speak to the wheel hop issue, since I never drove it without the kit, but man it handles nice. Rides pretty smooth too, considering there's no rubber in the back except the tires. Just some gear noise, as Bruce will warn you. Wicked expensive though. Like $600 for the lit (IIRC) plus like 10 hours of shop labor.
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Old 09-27-2011, 11:19 AM   #5
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Re: IRS wheel hop issues.......

go on their site and watch the gif's about free suspension movement with OEM bushings and theirs its crazy lol... dont put poly bushings in the IRS FYI.
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Old 10-02-2011, 08:02 PM   #6
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Re: IRS wheel hop issues.......

So......the inevitable happened this wkend at Mustang Nationals in Bowling Green, Ky. I entered the True Street class for the saturday run. Got there friday afternoon, was able to get some test and tune runs in that afternoon and evening, ran like ****. Got some pointers and tips later on and ran a little bit better saturday afternoon.

Found out that we true street guys could enter the bracket race class for sunday, which I jumped on. My 1st run in bracket, did my burnout, launched slightly over 2k, wheel hopped like a *****, then it broke. My passenger CV let go.

So my question is, what would you guys suggest doing for the quickest, cheapest route to get this back on the road. And, what exactly is involved in swapping my IRS to a solid rear end? Also, about how much should I expect to pay for a CV for my 01 Cobra?

I look forward to hearing from you guys.
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Old 10-02-2011, 08:33 PM   #7
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Re: IRS wheel hop issues.......

upgrade to 31 spline, or grab a bullitt or mach 1 8.8 - since they have the bracket for cobra brakes. you're looking around $300 for a 28 spline half-shaft to replace your broken one. i have fully built my irs and love it, but i only circuit race - no drag.
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Old 10-02-2011, 08:36 PM   #8
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That sucks that you broke the cv axle that's wat I broke doin a 7k launch on radials. I looked from local junkyards and they wanted upwards of a grand for everything to do a swap. I tried to piece everything together and it still came out to 800 but there is a guy in Nebraska that has another axle still here's his number 3089956153 he charged me 150 shipped that was the only 28 spline axle and 31 domineering upgrade is just as expensive as a sra. I would check with him on that used axle
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Old 10-03-2011, 06:44 PM   #9
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Re: IRS wheel hop issues.......

Wheel hop is what kills axles in these cars.

My recommendations are aftermarket springs and a drag radial/slick on a 16" wheel.

I've cut 1.6 60' leaving fairly soft on this setup, left hard a few too many times and broke an axle myself.

It's absolutely nothing to changing the half-shaft out, just have to do it. Hardest part will be getting your hands on one for a decent price.
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Old 10-10-2011, 08:34 AM   #10
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Re: IRS wheel hop issues.......

So, right now, simply trying to get this fixed as quickly as I can. Which brings me to another question......

I think I've decided to swap it to solid rear end soon. But I'd like to get some thoughts, ideas, comments from ppl who know about it this conversion, I'd like to hear from ppl who have done it........

is it worth it? how much am I to expect to spend (there abouts)? I heard from a buddy that swapping to sra detracts from the driving experience? Is this true? Or is it BS? Will it be a straight swap? Or will I have to locate a conversion kit? If so, how much is this conversion kit?

Lots of questions, very anxious to hear back from you guys, looking forward to hearing what you have to say and share. Anymore further thoughts and advice would be appreciated.
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Old 10-10-2011, 08:39 AM   #11
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Re: IRS wheel hop issues.......

swaping over to an SRA is the easy way out IMO, it works... but you give up the advantages of the IRS such as ride quality and handling~ not a huge deal if thats what you want (just to go in a straight line). I would keep the IRS though in case you decide to sell your car later as nothing screams "BEAT TO HELL" like an SRA swaped 03/04 cobra.

With springs, full length weld in sub frames, and wider/better tires I really dont have wheel hop. Final step for me would be bushings and a couple other little things.
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Old 10-10-2011, 09:52 AM   #12
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Re: IRS wheel hop issues.......

whats IMO? Ive got an 01 Mustang V6 with lots of mods, have been pretty content with the ride quality and handling with it. Wouldn't mind getting into auto cross or road coarse racing, but unfortunately, that isn't all that popular around here, so.....1/4mi it is.

Oh yeah, I don't junk, toss, or sell my major components that I mod or remove. So, I'll certainly be keeping my IRS on call. Can't take the son of a b*&% to heaven, drive the h*&^ out of it while you're here.

So, about how much would the swap cost? outside the cost of the diff? do I need any extra components?
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Old 10-10-2011, 09:54 AM   #13
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Re: IRS wheel hop issues.......

IMO is just short for In My Opinion

and swap costs just depends if you swap in all the OEM parts to remove wheel hop for other issues or if you go with better parts ,gears, etc as that can add up VERY quickly (panhard bar, tq arm etc)
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Old 10-10-2011, 06:52 PM   #14
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Re: IRS wheel hop issues.......

To do a solid swap properly.

Housing - $2-300
Diff cover - $50-100
Gears - $130 4.10 ford racing
Locker - $555 detroit true trac
Axles - $249.50 strange 31 spline axles
Studs - $50
Upper control arms - $250
Lower control arms - $250
Swap your driveshaft flange for a SRA flange.
SRA rear springs - $25-200
Proper shocks/struts - $200-300

Total cost will be around 2k if you shop around...definitely not the cheap way out.

I would have already gone solid if it wasn't for the costs involved. You can cheap out somewhat if you get your hands on a 03/04 Mach 1 rear axle as you shouldn't need to upgrade axles for a little while at least, locker will go out before axles break.

But, if you're dead set on drag racing, prepare to spend some money on the right setup.
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Old 10-11-2011, 07:44 PM   #15
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Re: IRS wheel hop issues.......

Cool, that's whats up. I'd like to make this happen as soon as I can. Think I'm gonna collect the parts one at a time over the course of the next few months.

Another question............learned that the trans I have is specific to the cobra only (the 3650 5spd). with my 01 being an early iteration of it. Learned at the the track that the shift is s*&% after 6k. Which, is something I'm not all that excited about....which leads me to my question.....I'll be able to do this swap once....due to the depth of it, so, I want to make my choices wise ones.

I'm torn on which would be better of the 2. swap to a later 3650 (as found in later Mach 1s and terminators) or swap to a 4R70W automatic (as found in V6s/GTs)

I mainly drag race, so, to put that on the table. Look forward to hearing from you guys.
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Old 10-27-2011, 12:10 PM   #16
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Re: IRS wheel hop issues.......

So, good buddy of mine that i've grown up with bought him a 2nd mustang about the same time I did. He bought an 04 GT. This morning at work he mentioned just doing a complete even trade/swap. My IRS for his solid rear end. Like.....backing both cars in his shop and swapping entire rear end assys. over the course of a wkend or what not.

so my question would be.....would kind of hickups would we run into if any? being that we're swapping entire rear ends. i look forward to hearing back from you guys.
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Old 10-27-2011, 02:36 PM   #17
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Re: IRS wheel hop issues.......

do both cars have abs?, brake lines will be different but technically you should have all you need there to swap it over. Your IRS rear has bigger brakes so i wouldnt swap those, keep those (will need bracket and rotor etc)

SRA is not as expensive as an IRS FYI, IRS usually sells for a good price so keep that in mind before doing an even trade research it a bit.

In my opinion you are giving away the major part of what makes a cobra a cobra. Thinking it cant launch well with the IRS is a huge mistake, might not be easy but you give up ride quality (a good bit of it actually), handling, and other things to be able to done thing cheaper (launch and go in a straight line easier)
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Old 10-28-2011, 10:44 AM   #18
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Re: IRS wheel hop issues.......

well, I'm not doing it tomorrow or anything. just simply asking around and doing some research and such. But I'll certainly keep doing some digging.
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Old 11-02-2011, 01:42 PM   #19
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Man keep u IRS just how the exhaust look from the back it is super nice
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Old 12-18-2011, 08:01 PM   #20
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Try stiffer springs
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Old 12-19-2011, 10:25 AM   #21
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Re: IRS wheel hop issues.......

stiffer springs really helped my hop, the H&R race are some of the stiffer ones you can get (non coil over)
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Old 01-26-2012, 11:28 PM   #22
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I have H&R race springs but it still hops. But i have 577rwhp so I guess next is the full tilt boogie irs bushing upgrade.
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