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The rear end.

0

01VENOM03

Guest
urithane bushings. and better control arms. change out the springs with like ibach or something. but the urithane bushings will help alot.
 
blackstallion06

blackstallion06

Everrett Wa. Soon to be St. Louis MO.
Donator
Venom is right about bushings. You can go through W.S. and get a discount through Stang suspension. they have life time warrenty to. Send Emilio a PM
 
Windveil Blues

Windveil Blues

OLD FART
Be sure and expect a stiffer, noisier suspension, though. Phill and I both thought something was wrong after we changed our control arms... lol. I don't even hear them anymore. But yeah, urethane is the way to go to stiffen things up.

Jim
01VENOM03 said:
urithane bushings. and better control arms. change out the springs with like ibach or something. but the urithane bushings will help alot.
Click to expand...
 
W

wickedstangs

Guest
blackout03 said:
Any body got any suggestions on getting more traction out of the irs set up?
Click to expand...

QUESTION: I want a stronger rear setup for racing. Should I swap for a live rear axle or build up the IRS system?

ANSWER: Either one will work if done properly. Some want a simple but strong rear setup and choose the live rear option at the expense of slightly compromised ride and handling. Others choose to build up the IRS system.

The Red Pill also includes info on how to drop the transmission to install the LDC cooling mod.

Special thanks to Dave Franey (Postban on SVTPerformace.com) for his great research and documention.


You need the Red Pill
pill-red.jpg

pill-blue.jpg


Welcome to the RED PILL, my name is Dave, 4+ year SVTP veteran poster and 03 Cobra owner/modifier. I have compiled this post through spending my own money, buying, trying, breaking these components. My own experience, my opinions, my conclusions.

I have owned 2 03 Cobras, the first a live axle, ported Eaton, Pullied, Bassani, PHP intake Convertible. The second is the car I have now, 670sae RWHP, T76 Hellion Turbo, Cammed, ported heads, built shortblock, custom return fuel, Viper trans and Level 5 IRS coupe. Now, on to the RED PILL.

The only cure for wheelhop is the system approach. The stock car has many flaws in the rear suspension system. Soft rubber bushings, flexible body structure, unsupported IRS mounts, soft springs in the vert, slippery tires, weak halfshafts and a fragile diff cover.

The basic premise is firm up the points of contact for each of the major components.

Below is a list of relationships so you understand where hop comes from;

*Differential case is mounted with soft bushings, allows it to rotate side to side and front to back, MM bushings cure this.

*IRS Cradle is mounted with flexible bushings, allows it to move in relation to cars chassis mounting points, MM polyurethane bushings cure this.

*Upper and lower countrol arms are mounted with flexible bushings, this allows the wheel to move forward/back when you only really want it to move up/down, MM delrin bushings, aluminum sleeves cure this.

*Toe link bars are very small diameter and flexible, weakest point of support for the wheel, allows wheel to turn in/out and move forward/back, using PHP toe link bars cures this.

*Rear IRS subframe mounts are cantilevered 3+" from the rear subframe, allows for up/down flex in the IRS cradle mounting point, using Billetflow IRS Mount brackets with backer plates cures this.

*Convertible springs are too low of a rate to work with us to reduce hop, using coupe rate springs helps.

All these parts moving and flexing and rotating...... it has no choice but to hop.

Luckily now, after several years of suffering, a replacment or improvement exists for everyone of those components.

Follow this proven mod path to a hard hooking but smooth riding/handling Cobra IRS.

The below mods are carefully arranged to help you out.

You should start at #1 and go straight to #6 for any car from stock up to 500rwhp.

All those mods compliment each other and will dramatically reduce wheelhop on all surfaces. Do not ask me which of the first 6 you can skip, the answer is NONE.

FOR WHEELHOP
Listed in order of necessity/priority.
Stock to CPIE wheelhop mods

1)Billetflow Diff Cover Brace $160
2)MM Diff bushings $50 or $250
3)MMFLSFC's installed $250-300 installed
4)MM IRS Bushings $50 with 14mm bolts/nuts $15
5)Billetflow IRS Mount Brackets $50
6)Used coupe springs $50 (est) (only for verts)
7)Nitto DR $375-$425 installed

500rwhp and up
8)PHP toe link bars $410
9)Maximum Motorsports UCA/LCA Bushings $550
10)Level 5 shafts $1500
 
blackstallion06

blackstallion06

Everrett Wa. Soon to be St. Louis MO.
Donator
Wow great post! Have any of the other cobra drivers went this route? I know some of you have some high hp. cars ( y-sam)
 
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