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Re: Front End Issues Continue to Haunt Me
[Re: Moparteacher]
#232209
02/22/09 03:52 AM
02/22/09 03:52 AM
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Joined: Apr 2007
Posts: 3,746
Riverside, California
Lil Demon
OP
master
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OP
master
Joined: Apr 2007
Posts: 3,746
Riverside, California
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Quote:
Vegas!...OK..North Las Vegas. Autotmotive Instructor for the College of Southern Nevada.
Cool - I'll come to the MATS a day early and you can teach your students how to fix bumpsteer on the car of an idiot who has mismatched parts - LOL!!! It's a win-win.
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Re: Front End Issues Continue to Haunt Me
[Re: Lil Demon]
#232210
02/22/09 04:41 AM
02/22/09 04:41 AM
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Joined: Jan 2003
Posts: 27,468
So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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Quote:
Quote:
Vegas!...OK..North Las Vegas. Autotmotive Instructor for the College of Southern Nevada.
Cool - I'll come to the MATS a day early and you can teach your students how to fix bumpsteer on the car of an idiot who has mismatched parts - LOL!!! It's a win-win.
You need a bumpsteer gauge for that too.
There is a scrub radius gauge too. I think you could find one through the circle track suppliers like Longacre. SAI measurement on an alignment rack and some calcs should get you close too.
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Re: Front End Issues Continue to Haunt Me
[Re: Lil Demon]
#232211
02/22/09 06:17 AM
02/22/09 06:17 AM
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Joined: Sep 2008
Posts: 2,840
Flint, Michigan
B1Fish540
master
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master
Joined: Sep 2008
Posts: 2,840
Flint, Michigan
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Quote:
Quote:
Vegas!...OK..North Las Vegas. Autotmotive Instructor for the College of Southern Nevada.
Cool - I'll come to the MATS a day early and you can teach your students how to fix bumpsteer on the car of an idiot who has mismatched parts - LOL!!! It's a win-win.
 Lil Demon will be your "visual aid" 
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Re: Front End Issues Continue to Haunt Me
[Re: toddd]
#232215
02/22/09 11:02 AM
02/22/09 11:02 AM
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Joined: Feb 2003
Posts: 3,998
GO BUCKS !!!!!!!
340RICK
master
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master
Joined: Feb 2003
Posts: 3,998
GO BUCKS !!!!!!!
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Your front end alingment is not your prob  Like stated above its the length of tie rods and postion of the tie rod that will cause bump steer. I would bet that you also have a K frame that is flexing as well. The force of the spindle wanting to twist when the brakes are applied is greater than you might think. Bondo and I went all thru this last summer in Perfecting his steering arms and tie rod ends.
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Re: Front End Issues Continue to Haunt Me
[Re: 1976 Aspen]
#232218
02/22/09 11:59 AM
02/22/09 11:59 AM
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Joined: Apr 2007
Posts: 3,746
Riverside, California
Lil Demon
OP
master
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OP
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Joined: Apr 2007
Posts: 3,746
Riverside, California
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Quote:
It shakes only whenyou're braking??? Sounds like warped brake rotors too me  Simple fix 
I'm pretty sure the rotors are not warped, but I'll add that to the list of things to check.
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Re: Front End Issues Continue to Haunt Me
[Re: hot67cuda]
#232219
02/22/09 12:03 PM
02/22/09 12:03 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Some of the guys here think 8*-10* is too much caster, what do you think all of the fastest drag cars run. I have about 10* on my car and I can let go of the wheel anytime after the torque of the engine is done trying to twist the car.... even on decell on top end. Granted its a strut. You have to look at the distance between the ball joint centerline to the center of the tire... thats a substantial leverage arm to apply a load to ANY weak points/parts. In production we didnt put a dished wheel on just to clear the fender, its put on to align the loads 
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Re: Front End Issues Continue to Haunt Me
[Re: 1976 Aspen]
#232220
02/22/09 12:06 PM
02/22/09 12:06 PM
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Joined: Oct 2004
Posts: 1,327
south central,Pa
mopar_to_ya
pro stock
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pro stock
Joined: Oct 2004
Posts: 1,327
south central,Pa
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Quote:
It shakes only whenyou're braking??? Sounds like warped brake rotors too me Simple fix
My LRT does the same thing about midway through the shutdown. If I lift off the brakes and re apply then it usually stops. But if you all are cracking steering arms, that scares me. I thought I was the only one out there with this problem. I guess I'll have to do some more checking.
Rob told me that the new steering arm design would fix any issues, but I never got any to find out for sure.
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Re: Front End Issues Continue to Haunt Me
[Re: mopar_to_ya]
#232222
02/22/09 12:11 PM
02/22/09 12:11 PM
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Joined: Apr 2007
Posts: 3,746
Riverside, California
Lil Demon
OP
master
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OP
master
Joined: Apr 2007
Posts: 3,746
Riverside, California
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Quote:
Quote:
It shakes only whenyou're braking??? Sounds like warped brake rotors too me Simple fix
My LRT does the same thing about midway through the shutdown. If I lift off the brakes and re apply then it usually stops. But if you all are cracking steering arms, that scares me. I thought I was the only one out there with this problem. I guess I'll have to do some more checking.
Rob told me that the new steering arm design would fix any issues, but I never got any to find out for sure.
I have the new arms and never had this issue before putting them on. I'm not blaming them, just pointing out they could be a contributing factor.
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Re: Front End Issues Continue to Haunt Me
[Re: 540dust]
#232223
02/22/09 12:12 PM
02/22/09 12:12 PM
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Joined: Apr 2007
Posts: 3,746
Riverside, California
Lil Demon
OP
master
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OP
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Joined: Apr 2007
Posts: 3,746
Riverside, California
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Quote:
Your situation may be different but when I had my Dare the more bumpsteer I took out of it made no difference at all on the shake.
I'ver always had bumpsteer, but never the shakes like this.
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Re: Front End Issues Continue to Haunt Me
[Re: Lil Demon]
#232225
02/22/09 12:25 PM
02/22/09 12:25 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Your situation may be different but when I had my Dare the more bumpsteer I took out of it made no difference at all on the shake.
I'ver always had bumpsteer, but never the shakes like this.
All thats really happened is that with changing some
parts trying to get lighter you have found some weak
points, weather its a control arm or what ever, as soon
as you apply load to the tire on braking its twisting
the front end at the weak point. The guys with the
big off road tires have the same issues but they
cover it up with the damper on the steering... they
just found the weak point also. We already know its
not your alignment(if things dont change or bend)
because its not doing it during your run... this is
induced when you apply the brakes
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