Bigger tires up front, more pronounced hunting on the road
#2342475
07/24/17 03:49 PM
07/24/17 03:49 PM
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Joined: Jan 2003
Posts: 1,721 Eugene, OR
FuryBoy
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,721
Eugene, OR
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Went from 235/60r15s to 245/60r15s on the front and 245/60r15s to 255/60r15s on the back. Haven't adjusted the torsion bars yet, but I think the front end could be lowered down a little bit now.
The car has hunted a little bit forever, it has a FF stage 2 steering box, FF seemless HD tie rods, FF 1.06 torsion bars, moog problem solver bushings, new ball joints, pitman/idler arms, new LCA bushings, re-inforces LCAs, factory sway bar and poly bushings/endlinks.
The car feels like it has an inch of slop in the steering and will violently hunt back and forth when it finds a new set of ruts. Is this bump steer? I have had no luck with local alignment/suspension shops. I thought maybe the return on the steering box needed some adjustment but now I am wondering if I just have some severe bump steer due to K frame issues.
I suppose I should adjust the ride height and have the alignment checked again. What should I be aiming for with the problem solver bushings and 15 inch radial tires(won't be going to larger tires for quite some time)
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Re: Bigger tires up front, more pronounced hunting on the road
[Re: FuryBoy]
#2342827
07/24/17 11:55 PM
07/24/17 11:55 PM
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Joined: Dec 2003
Posts: 22,695 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,695
Bitopia
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What wheels do you have, or more to my point, did the offset change with change of wheel from OEM? Reason being, I've always suspected a change of wheel offset, would change tire "scrub, and might lead to wandering, this point I mention it because it is seldom discussed, why (?), because it has no merit, or whatever? Just throwing it out there. "When the vehicle has been modified with offset wheels, larger tires, height adjustments and side to side camber differences, the scrub radius will be changed and the handling and stability of the vehicle will be affected." Wiki https://en.wikipedia.org/wiki/Scrub_radius
Last edited by jcc; 07/25/17 12:02 AM.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Bigger tires up front, more pronounced hunting on the road
[Re: FuryBoy]
#2343480
07/26/17 02:09 AM
07/26/17 02:09 AM
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Joined: Jan 2003
Posts: 27,444 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,444
So Cal
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You only went up one side wider/taller tires. The car only rose a 1/4" ( radius of 1/2" diameter change). Your caster and camber will not change. The toe change is insignificant
How does this car's steering feel compared to the other vintage Mopars you've owned?
Last edited by autoxcuda; 07/26/17 02:24 AM.
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Re: Bigger tires up front, more pronounced hunting on the road
[Re: FuryBoy]
#2343518
07/26/17 07:22 AM
07/26/17 07:22 AM
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Joined: Jan 2003
Posts: 1,376 NORTHERN CA
HUSTLESTUFF
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,376
NORTHERN CA
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Straightened the steering wheel when I got home last night and snugged some 2x4s next to the tires. I should have snapped some pictures, but it does appear that the tires are toed out a decent amount.
That could have been the problem the whole time. You can adjust your toe with the tie rods and your 2x4's. Try that and see if it changes anything. Mike PS do you still have those headers from like 1999 I sent you? LOL
"Were in it to win it. Anything less will end up being..... A whole lot of fun doing!!" UNLAWFL RIP UN
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Re: Bigger tires up front, more pronounced hunting on the road
[Re: HUSTLESTUFF]
#2343732
07/26/17 03:44 PM
07/26/17 03:44 PM
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Joined: Jan 2003
Posts: 1,721 Eugene, OR
FuryBoy
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,721
Eugene, OR
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Straightened the steering wheel when I got home last night and snugged some 2x4s next to the tires. I should have snapped some pictures, but it does appear that the tires are toed out a decent amount.
That could have been the problem the whole time. You can adjust your toe with the tie rods and your 2x4's. Try that and see if it changes anything. Mike PS do you still have those headers from like 1999 I sent you? LOL Holy smokes, yes, I kind of do! Was that off MoparChat or Moparts? I used the headers on the 318 but eventually put hooker super comps I snagged from the swap meet once I swapped to my 360. Installed the old headers on my grandpa's '4 Plymouth that had a diplomat front end in it. They fit surprisingly well. Mopar people are the best people! Was 15 when you sent me those headers! I'm gonna lower the front end a smidge as it's riding fairly level right now and then re align it.
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Re: Bigger tires up front, more pronounced hunting on the road
[Re: FuryBoy]
#2346846
08/01/17 07:30 PM
08/01/17 07:30 PM
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Joined: Jan 2010
Posts: 1,440 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,440
NW Chicago suburban area
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For "pylon" autocrossing (where quick l-r-l-r-l-r responses are needed), a little toe-OUT is actually preferred as it helps quicken the maneuvers, but for street/highway/hi-speed track events a little toe-IN is preferred ... for stability at higher speeds.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: Bigger tires up front, more pronounced hunting on the road
[Re: FuryBoy]
#2351247
08/09/17 11:51 AM
08/09/17 11:51 AM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Toe out will wander as said.
Wider tires will wander too, but your change shouldn't be enough to change that.
I once had a set of 315 wide road race tires on the front of my Dakota. It wandered over every crown in the road, every rut in the asphalt. I did not like it and changed my wheel combo.
Now with 285 wide fronts, it does not wander
Adjust your toe and report back
**Photobucket sucks**
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Re: Bigger tires up front, more pronounced hunting on the road
[Re: FuryBoy]
#2382812
10/06/17 02:01 AM
10/06/17 02:01 AM
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Joined: Mar 2005
Posts: 792 Earth
Rob C
super stock
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super stock
Joined: Mar 2005
Posts: 792
Earth
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