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IRS Drag Race setup
http://motorsportsvillage.com/forum/viewtopic.php?f=8&t=8990
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Author:  Disturbed [ Fri Feb 24, 2012 8:17 am ]
Post subject:  IRS Drag Race setup

Guys...I know 100% of NOTHING about suspension setup. I've seen IRS do 1.2 60ft times....how. I'm @ 1.72 right now. I run 345/30/18 BFG DR's. Watch the vid and let me know what needs to be tweeked. I have Moton shocks so they are fully adjustable. I do get a little spin off the line still. I was running tires pressure @ 18psi, this was also my 1st time ever out on DR's. Next time I'll drop to 16psi and hope it hooks a little better. What I do notice, is that the car doesn't squat. I get no lift on the front end. I did remove the front sway bar but I don't think it helped much.

http://www.youtube.com/watch?v=7j1xZ_JmMck

Author:  Disturbed [ Wed Feb 29, 2012 4:01 pm ]
Post subject:  Re: IRS Drag Race setup

Nobody have an idea on IRS setup for drag racing????

Author:  shrinker [ Wed Feb 29, 2012 5:31 pm ]
Post subject:  Re: IRS Drag Race setup

Theres nothing much that you can setup. All you can do is find the best shocker setting. IRS doesnt react the wheels downwards into the ground at the instant of torque application. Normal 4 link or ladder bars shove the wheels down in response to the inertia of the wheel. IRS doesnt do that. IRS has a fixed IC at the front axle. Theres not much you can do with it without making it into something else.

Author:  Disturbed [ Thu Mar 01, 2012 7:06 am ]
Post subject:  Re: IRS Drag Race setup

shrinker wrote:
Theres nothing much that you can setup. All you can do is find the best shocker setting. IRS doesnt react the wheels downwards into the ground at the instant of torque application. Normal 4 link or ladder bars shove the wheels down in response to the inertia of the wheel. IRS doesnt do that. IRS has a fixed IC at the front axle. Theres not much you can do with it without making it into something else.



I am not so sure I agree. Guys are getting 1.2 60ft times with IRS. SOMETHING has to be working.

Author:  Beretta [ Thu Mar 01, 2012 8:32 am ]
Post subject:  Re: IRS Drag Race setup

What's there ET/MPH??????

Author:  shrinker [ Thu Mar 01, 2012 2:29 pm ]
Post subject:  Re: IRS Drag Race setup

Disturbed wrote:
I am not so sure I agree. Guys are getting 1.2 60ft times with IRS. SOMETHING has to be working.

Disturbed wrote:
Nobody have an idea on IRS setup for drag racing????

You asked about the design not the performance. 60' times comes from power and traction. If your not spinning the wheels excessively you have enough traction for your power. Just increase power and maybe get stickier tires and it will go faster 60'

Author:  Disturbed [ Thu Mar 01, 2012 5:24 pm ]
Post subject:  Re: IRS Drag Race setup

Beretta wrote:
What's there ET/MPH??????



7.11@201mph....on M/T 315/60/15 DR's, full weight street car, nothing removed. He's looking for 6's. Below is a video of it doin' work.

http://www.youtube.com/watch?v=ZYpx-0HJMQ4



I love how it launches...just a little squat and it's gone. No Drama, nothin' just hooked and gone.

Author:  shrinker [ Thu Mar 01, 2012 5:32 pm ]
Post subject:  Re: IRS Drag Race setup

Well a 1.2 time for 60' is slow for a car that can do 7.11 and 200mph. Which is what I would expect for an IRS rear end. IRS is not the way to go for traction snap.

Author:  Ken0069 [ Thu Mar 01, 2012 6:13 pm ]
Post subject:  Re: IRS Drag Race setup

With what your car runs now, 1.12 short times still won't get you 7.11 on the other end. The guy in the video has got to have a bunch of stuff in the engine dept that you don't.

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