03 Wheel hop

TRMN8R · 11-27-2010, 06:30 AM

I have a 2003 Cobra with the IRS. Motor has some work, and is putting about 500 hp to the wheels. I recently put a Spec Stage 3+ in the car, and it is a real PITA to launch at the dragstrip. I've got about 600 break in miles on the clutch, and it now has good street manners (it was real ugly when brand new, but they do break in good).

Matt at Spec suggested checking with all of you re how to get a good launch at the strip. The IRS has urethane bushings, not the stock rubber, but factory shocks.

He also suggested I look for RTUSNAKE at this site for suggestions.

ANY ideas, RTUSNAKE or anyone else? I appreciate the help!

TheJeanyus · 11-27-2010, 07:59 AM

Welcome to the forum.

Stickier tires, stiffer springs, and adjustable shocks all help with the wheel hop. A differential brace will help prevent the diff cover from exploding when it does hop.

I had a brace, H&R springs, drag radials (for a little while), and urethane bushings on mine, and it didn't hop too bad...but it was still really hard to launch. The truth is, it's just going to be tough to drive on street tires with 500hp regardless of what you do.

TRMN8R · 11-27-2010, 09:35 AM

Where did you get your H&R springs? I have a differential brace cover, and am running Nitto drag radials. I think Mickey Thompsons next spring may be a good idea. Did you run the stock shocks? I have not been able to find adjustable shocks for the IRS.

qkjuicedpony · 11-27-2010, 10:12 AM

Put a solid axle in it and be done....or spend a lot of money of halfshafts

QWKSNKE · 11-27-2010, 11:33 AM

Moved to the proper forum.

Look into the stuff from Full Tilt boogie

http://fulltiltboogieracing.com/index.htm

I have bought a couple of items for my wife's 01 cobra and plan to buy more since most of her bushing are shot

rtusnake · 11-27-2010, 05:43 PM

If you run at the strip alot, don't run drag radials. Subframes are the best mod imo to help with wheel hop. I had subframes, adjustable shocks and irs brace on mine. Didn't hop on slicks or street tires. I would get a et drag to run at the track. I went a best of 1.48 on my irs and usually mid 1.5s when I had a ported eaton

TRMN8R · 11-27-2010, 06:37 PM

Thanks, all.
I am going to keep the IRS, and the 6 speed. I have a 26 spline (Liberty) in the transmission. I have urethane bushings in the IRS, but will serioulsly look at the alternative to MM parts. I also have full length subframe connectors welded in.
I have Level 5 axles, so no worries about that, although I think they made a mod that affects how they fit, but not how they work. I recommend them for racing, but if you try them and they look like they don't fit right let me know. I can save you some hassles.
I do my own wrench turning, so if you run into a problem installing parts on or in your IRS let me know. You do not need to completely pull the IRS from the car to install any bushing, or to pull the pumpkin(regardless of what you read). I've done it myself, singlehandedly, in my garage.
I am looking for advice or mods that will let me launch with the Spec Stage 3+. I like the grip, but don't know what additional mods or launch technique I need to get it to work real good at the track. I ran 7.4s in the 1/8 with the stock clutch with 40K on it, and finally toasted it last year. I want to get quite a bit faster with the Spec. I plan on new track tires next spring, so advice there is also wanted. I am running 17 x 10.5 rims.

TRMN8R · 11-27-2010, 06:39 PM

What adjustable shocks, and what tires were you running, rtusnake?

darkside · 11-27-2010, 06:47 PM

i don't have anything to add here, but welcome to the forum fellow northern alabamian.

TRMN8R · 11-27-2010, 07:02 PM

Thanks. Darkside. Would like to see your ride. My Cobra is black, with dark grey ghost flames, in Decatur, usually run at Huntsville and Moulton, occasionally Steele.

11-27-2010, 06:30 AM	#1
TRMN8R Junior Member Join Date: Nov 2010 Location: Decatur AL Posts: 6	03 Wheel hop I have a 2003 Cobra with the IRS. Motor has some work, and is putting about 500 hp to the wheels. I recently put a Spec Stage 3+ in the car, and it is a real PITA to launch at the dragstrip. I've got about 600 break in miles on the clutch, and it now has good street manners (it was real ugly when brand new, but they do break in good). Matt at Spec suggested checking with all of you re how to get a good launch at the strip. The IRS has urethane bushings, not the stock rubber, but factory shocks. He also suggested I look for RTUSNAKE at this site for suggestions. ANY ideas, RTUSNAKE or anyone else? I appreciate the help!

11-27-2010, 07:59 AM	#2
TheJeanyus Administrator Join Date: Dec 2004 Location: Huntsville, AL Posts: 14,774	Welcome to the forum. Stickier tires, stiffer springs, and adjustable shocks all help with the wheel hop. A differential brace will help prevent the diff cover from exploding when it does hop. I had a brace, H&R springs, drag radials (for a little while), and urethane bushings on mine, and it didn't hop too bad...but it was still really hard to launch. The truth is, it's just going to be tough to drive on street tires with 500hp regardless of what you do. __________________ 1998 Mustang GT Coupe - World's Slowest Racecar 2005 Toyota 4Runner SR5 V8 2013 Volkswagen Jetta Sportwagen TDI

11-27-2010, 09:35 AM	#3
TRMN8R Junior Member Join Date: Nov 2010 Location: Decatur AL Posts: 6	Thanks, Jeanyus. Where did you get your H&R springs? I have a differential brace cover, and am running Nitto drag radials. I think Mickey Thompsons next spring may be a good idea. Did you run the stock shocks? I have not been able to find adjustable shocks for the IRS.

11-27-2010, 10:12 AM	#4
qkjuicedpony Dayuuuuuuum!!!!! Join Date: Dec 2004 Location: Dallas GA Posts: 2,933	Put a solid axle in it and be done....or spend a lot of money of halfshafts __________________ 86 Mustang Gt......Mods piling up in my garage. 07 F350 dooly.....Tows my fifth wheel

11-27-2010, 11:33 AM	#5
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Moved to the proper forum. Look into the stuff from Full Tilt boogie http://fulltiltboogieracing.com/index.htm I have bought a couple of items for my wife's 01 cobra and plan to buy more since most of her bushing are shot __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

11-27-2010, 05:43 PM	#6
rtusnake Halfshaft Killer Join Date: Mar 2005 Location: The Kingdom Posts: 3,910	If you run at the strip alot, don't run drag radials. Subframes are the best mod imo to help with wheel hop. I had subframes, adjustable shocks and irs brace on mine. Didn't hop on slicks or street tires. I would get a et drag to run at the track. I went a best of 1.48 on my irs and usually mid 1.5s when I had a ported eaton __________________ 03 Cobra 06 F250 (\__/) (='.'=) (")_(")

11-27-2010, 06:37 PM	#7
TRMN8R Junior Member Join Date: Nov 2010 Location: Decatur AL Posts: 6	Thanks, all. I am going to keep the IRS, and the 6 speed. I have a 26 spline (Liberty) in the transmission. I have urethane bushings in the IRS, but will serioulsly look at the alternative to MM parts. I also have full length subframe connectors welded in. I have Level 5 axles, so no worries about that, although I think they made a mod that affects how they fit, but not how they work. I recommend them for racing, but if you try them and they look like they don't fit right let me know. I can save you some hassles. I do my own wrench turning, so if you run into a problem installing parts on or in your IRS let me know. You do not need to completely pull the IRS from the car to install any bushing, or to pull the pumpkin(regardless of what you read). I've done it myself, singlehandedly, in my garage. I am looking for advice or mods that will let me launch with the Spec Stage 3+. I like the grip, but don't know what additional mods or launch technique I need to get it to work real good at the track. I ran 7.4s in the 1/8 with the stock clutch with 40K on it, and finally toasted it last year. I want to get quite a bit faster with the Spec. I plan on new track tires next spring, so advice there is also wanted. I am running 17 x 10.5 rims.

11-27-2010, 06:39 PM	#8
TRMN8R Junior Member Join Date: Nov 2010 Location: Decatur AL Posts: 6	What adjustable shocks, and what tires were you running, rtusnake?

11-27-2010, 06:47 PM	#9
darkside marlboro man Join Date: Apr 2008 Posts: 373	i don't have anything to add here, but welcome to the forum fellow northern alabamian. __________________

11-27-2010, 07:02 PM	#10
TRMN8R Junior Member Join Date: Nov 2010 Location: Decatur AL Posts: 6	Thanks, darkside Thanks. Darkside. Would like to see your ride. My Cobra is black, with dark grey ghost flames, in Decatur, usually run at Huntsville and Moulton, occasionally Steele.