Weird rear end feeling while exiting corners...
11-01-2005, 07:17 PM
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Weird rear end feeling while exiting corners... After a few spirited drives through the mountains the past month, I have come to notice somethings.
Once I start slowing down for a corner, as I enter the corner, then as soon as I start to accelerate hard to exit the corner, there is a weird feeling coming from the rear. It feels as if the rear is "moving" from side to side or the "body moving over the rear" maybe. It is hard to explain unless you have felt this before.
I thought that a Adj. Panhard bar would help. Just seeing if someone could shed some light on this for me.
Once I start slowing down for a corner, as I enter the corner, then as soon as I start to accelerate hard to exit the corner, there is a weird feeling coming from the rear. It feels as if the rear is "moving" from side to side or the "body moving over the rear" maybe. It is hard to explain unless you have felt this before.
I thought that a Adj. Panhard bar would help. Just seeing if someone could shed some light on this for me.
11-01-2005, 07:44 PM
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Originally Posted by 1BADAIR
Stock LCA's and PHB??
Originally Posted by 1BADAIR
cause a rear steer feeling.
11-01-2005, 08:03 PM
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Does it make any noises when you hit a bump or rough patch of pavement? My suspension is totally stock and is doing something similar but it makes a rattling and squeeking sound when it hits a bump. It also makes a popping sound when I start to back and turn in my yard.
11-01-2005, 08:05 PM
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Originally Posted by BS
Does it make any noises when you hit a bump or rough patch of pavement? My suspension is totally stock and is doing something similar but it makes a rattling and squeeking sound when it hits a bump. It also makes a popping sound when I start to back and turn in my yard.
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11-01-2005, 08:33 PM
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Originally Posted by mitchntx
What kind of tires, size and air pressures?
I actually think I haven't pumped the rears up since the drag strip, so if I had to guess 22-28psi, maybe lower.
11-01-2005, 09:03 PM
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Originally Posted by mitchntx
Add some air ... maybe to 32. I bet that solves 90% of the problem ...
EDIT: What psi should the fronts be too??
11-01-2005, 10:05 PM
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Originally Posted by OneMeanZ
After a few spirited drives through the mountains the past month, I have come to notice somethings.
Once I start slowing down for a corner, as I enter the corner, then as soon as I start to accelerate hard to exit the corner, there is a weird feeling coming from the rear. It feels as if the rear is "moving" from side to side or the "body moving over the rear" maybe. It is hard to explain unless you have felt this before.
I thought that a Adj. Panhard bar would help. Just seeing if someone could shed some light on this for me.
Once I start slowing down for a corner, as I enter the corner, then as soon as I start to accelerate hard to exit the corner, there is a weird feeling coming from the rear. It feels as if the rear is "moving" from side to side or the "body moving over the rear" maybe. It is hard to explain unless you have felt this before.
I thought that a Adj. Panhard bar would help. Just seeing if someone could shed some light on this for me.
11-01-2005, 10:28 PM
#14
Originally Posted by OneMeanZ
I think there around 30-32psi
11-02-2005, 01:34 AM
#15
My rear used to feel like that, a little shimmy in the corner just like you're describing.
My stock panhard rod was BENT. Not just a little either. If you want me to I can post a pic tomorrow. I replaced it with a non-adjustable BMR piece, and that solved the problem with the shimmy. Check your panhard!
My stock panhard rod was BENT. Not just a little either. If you want me to I can post a pic tomorrow. I replaced it with a non-adjustable BMR piece, and that solved the problem with the shimmy. Check your panhard!
11-02-2005, 10:46 AM
#16
If the rear tires are indeed in the low 20's, that's a problem because the car will squim on the sidewalls. Air gives the tire support and some spring rate as well. 22 is too low. 32 is too high on street tires IMHO. Try 28-30 first, I bet you find it a lot better.
A better PHB would certainly help and actual lateral movement of the body relative to the axle.
Might be a roll generation thing...I think you just took some springs off the car and are getting more roll because of that. Might consider some bigger swaybars to get the roll stiffness under control. And I think you have Koni's correct? You can try and mess with the rear damping to see what happens.
Note that the shocks can't fix the pressures that are too low. The PHB can't fix a shock setting issue. Shocks can't fix the need for more PHB. Any of the above will make the rear feel a bit lazy compared to what you had before, so you have to figure out what you are feeling. Luckily you have the shocks and ability to air up the tires already so you cand figure some things out. If you find that more shock helps the feel, but the setting makes the ride too firm, that's an indication of wanting more bar.
A better PHB would certainly help and actual lateral movement of the body relative to the axle.
Might be a roll generation thing...I think you just took some springs off the car and are getting more roll because of that. Might consider some bigger swaybars to get the roll stiffness under control. And I think you have Koni's correct? You can try and mess with the rear damping to see what happens.
Note that the shocks can't fix the pressures that are too low. The PHB can't fix a shock setting issue. Shocks can't fix the need for more PHB. Any of the above will make the rear feel a bit lazy compared to what you had before, so you have to figure out what you are feeling. Luckily you have the shocks and ability to air up the tires already so you cand figure some things out. If you find that more shock helps the feel, but the setting makes the ride too firm, that's an indication of wanting more bar.
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Results matter. Talk is cheap. We are miles beyond the success anyone else has had with the 4th gens, and C5, C6, C7 Corvettes,
10 SCCA Solo National Championships, 2008 Driver of they Year, 2012 Driver of Eminence
13 SCCA Pro Solo Nationals Championships
2023 UMI King of the Mountain Champion
11-02-2005, 10:55 AM
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Well in December Sam, your 35mm bar and 22mm bar will be going on the car, along with a PHB. And unfortently I only have Koni's up front right now. But the rears will be coming very soon to along with new tires.
Sam what do you think about the front tires psi? What should they be at also?
Sam what do you think about the front tires psi? What should they be at also?
11-02-2005, 11:08 AM
#18
So what are the rear shocks? Stock? Bilstein's? And if so 3rd gen or 4th gen?
Depending on what shocks you have installed, my opinion of what's causing this could and would change.
Pressures.. I find 32/30 to be best, but if you have DeCarbon's or on the rear, you might like a higher pressure better for control, but it'll also ride more harshly and get tossed about over small bumps more often.
Depending on what shocks you have installed, my opinion of what's causing this could and would change.
Pressures.. I find 32/30 to be best, but if you have DeCarbon's or on the rear, you might like a higher pressure better for control, but it'll also ride more harshly and get tossed about over small bumps more often.
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www.stranoparts.com --814-849-3450
Results matter. Talk is cheap. We are miles beyond the success anyone else has had with the 4th gens, and C5, C6, C7 Corvettes,
10 SCCA Solo National Championships, 2008 Driver of they Year, 2012 Driver of Eminence
13 SCCA Pro Solo Nationals Championships
2023 UMI King of the Mountain Champion
www.stranoparts.com --814-849-3450
Results matter. Talk is cheap. We are miles beyond the success anyone else has had with the 4th gens, and C5, C6, C7 Corvettes,
10 SCCA Solo National Championships, 2008 Driver of they Year, 2012 Driver of Eminence
13 SCCA Pro Solo Nationals Championships
2023 UMI King of the Mountain Champion
11-02-2005, 11:31 AM
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Adjustable Panhard bars generally have a jam nut
that can back off over time making the rod end
kind of sloppy. That wants checking, maybe a dab
of RTV to keep it from walking again.
Might also check the upper mount point and the
cross brace stamping, make sure there's nothing
loose or missing there.
The other element (than side-side) is thrust angle
control, this is the LCAs' job and looseness in the
linkage there can make the car change geometry
under acceleration / braking even in a straight line.
My GS-D3s (285/40R17) are squirmy at 30PSI and
like 32PSI a lot better.
that can back off over time making the rod end
kind of sloppy. That wants checking, maybe a dab
of RTV to keep it from walking again.
Might also check the upper mount point and the
cross brace stamping, make sure there's nothing
loose or missing there.
The other element (than side-side) is thrust angle
control, this is the LCAs' job and looseness in the
linkage there can make the car change geometry
under acceleration / braking even in a straight line.
My GS-D3s (285/40R17) are squirmy at 30PSI and
like 32PSI a lot better.