Horrible handling

Red__Zed · 09-17-2012, 09:56 PM

Quote:

Originally Posted by SPOHN

The frame machine came back dead on so there was no pulls made to the sub frame/ unibody area. The alignment was hardly off. I haven't been on the tack in close to four months. I am running on new tires with about 800 miles on them. Maybe it's me. My nerves were shot trying to get back into the feel of it all. But even then I didn't feel right.

I talk to my buddy Mike and he feels also the toe maybe the issue along with the sway being to stiff. The turn in felt great but the exit of all turns felt slick. Maybe the tires need more time. Just trying to get different views here.

the obvious first comment is the new tires...you sure mold release, etc was good?

If we are staying on the topic of toe, you dialed in .08 of toe in, when the 370Z has an issue of too much toe when in on-throttle corner exits. If you were noticing it while on the gas, that really doesn't surprise me much...you were probably seeing an excessive amount of toe-in.

SPOHN · 09-17-2012, 11:01 PM

It was definitely when on throttle or applying throttle.

Red__Zed · 09-17-2012, 11:03 PM

Quote:

Originally Posted by SPOHN

It was definitely when on throttle or applying throttle.

I think the toe explanation is pretty reasonable then.

I definitely saw gain of > 1/32 when on throttle exit, and starting at .08 means you are probably seeing some crazy numbers.

Red__Zed · 09-20-2012, 10:56 PM

chris, you ever get a chance to tweak the toe and see how it felt?

SPOHN · 09-21-2012, 06:59 AM

Not yet. Changing traction arms tomorrow. Alignment next Friday. Been crazy busy with life lately.

MACSIMIZER · 09-21-2012, 08:28 AM

Thats what chicks will do to you.

sig11 · 09-21-2012, 09:50 AM

Some much more experienced folks have chimed in already but the first thing I would have done in that instance was soften the rear sway bar.

My first event of the year was my first on coilovers and with the rear bar at full stiff the car was very unpredictable and liked to step out mid-corner. (It put me 4 off twice! in one session) Dropped it to the middle setting and the car was much more predictable.

SPOHN · 09-21-2012, 10:43 AM

I'm going to make a handful of adjustments. With as much weight out of the rear and the roll cage added its definitely light and stiff back there.

Ubetit · 09-21-2012, 11:42 AM

I wouldn't put the rear sway on full stiff. I'm looking at the Whitelines and even on the softest setting, they are something like 30% stiffer. With the sways super stiff, you leave a lot up to the traction of the outside tire.

Dwnshift · 09-21-2012, 09:38 PM

I would have rechecked the toe.
Toe in will not do what you were experiencing. There are sooooo many things it could be.
Just as an FYI... Our front bar is 1.75" and our rear bar rates just a bit stiffer than stock

Again.... Without knowing everything.... It could be anything.

SPOHN · 09-21-2012, 10:22 PM

I feel now it's the sway bar. I'm changing traction arm tomorrow and will recheck alignment after. Do you guys feel I should keep the toe at .08 in?

I think I might had another issue. The same day I had a small fuel leak from the stock fuel side. A single screw was missing that holds the pump in and the O ring expanded allowing fuel to come out. So it ended up being a good bit coming out under track conditions. I wonder being the tank is on the outside of the car if the fuel was spilling onto the tire. Some fuel ended up in the passenger side floor board also. I had been testing the handling of the car on the street with no issues till that day.

ZeN · 09-21-2012, 10:43 PM

SPOHN, what you describe is exactly how I felt when running with my hotchkis sway bar set to full stiff at rear, I'll loosen it up to lowest if I were you.

SPOHN · 09-21-2012, 11:32 PM

That's what I was running (full stiff). Worked super great for me. But I believe the roll cage stiffened up the rear a lot. Never got to fully test my car after for the day I went to the track it was raining. definitely going softer setting. I'll get it right. It's definitely not the toe.

threeseventy · 09-22-2012, 12:41 AM

In for updates!

Shamu · 09-22-2012, 01:25 PM

Quote:

Originally Posted by M.Bonanni

I highly doubt the toe-in was the issue unless he accidentally went toe-out. You say you did or did not change the traction arms prior to the event? If you did, that's likely the issue as they can affect bump steer. Where exactly was it loose? Entry? Mid-corner? Braking? Exit? All of the above? If you answered all of the above its most likely a toe situation unless there is something mechanically wrong/broken that you didn't notice.

I agree sounds more like toe out issue or something that is not right after accident. Too much rear bar can be problem too.

09-17-2012, 11:01 PM	#17 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	It was definitely when on throttle or applying throttle. __________________

09-21-2012, 06:59 AM	#20 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	Not yet. Changing traction arms tomorrow. Alignment next Friday. Been crazy busy with life lately. __________________

09-21-2012, 10:43 AM	#23 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	I'm going to make a handful of adjustments. With as much weight out of the rear and the roll cage added its definitely light and stiff back there. __________________

09-21-2012, 10:22 PM	#26 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	I feel now it's the sway bar. I'm changing traction arm tomorrow and will recheck alignment after. Do you guys feel I should keep the toe at .08 in? I think I might had another issue. The same day I had a small fuel leak from the stock fuel side. A single screw was missing that holds the pump in and the O ring expanded allowing fuel to come out. So it ended up being a good bit coming out under track conditions. I wonder being the tank is on the outside of the car if the fuel was spilling onto the tire. Some fuel ended up in the passenger side floor board also. I had been testing the handling of the car on the street with no issues till that day. __________________

09-21-2012, 10:43 PM	#27 (permalink)
ZeN Base Member Join Date: Apr 2011 Location: Malaysia Posts: 116 Drives: 09 PW 7AT 370z Rep Power: 14	SPOHN, what you describe is exactly how I felt when running with my hotchkis sway bar set to full stiff at rear, I'll loosen it up to lowest if I were you. sig11 likes this.

09-20-2012, 10:56 PM	#19 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 120	chris, you ever get a chance to tweak the toe and see how it felt?

09-21-2012, 08:28 AM	#21 (permalink)
MACSIMIZER Enthusiast Member Join Date: Feb 2011 Location: Pensacola FL Posts: 268 Drives: '10 370Z Rep Power: 18	Thats what chicks will do to you.

09-21-2012, 09:50 AM	#22 (permalink)
sig11 A True Z Fanatic Join Date: Jun 2009 Location: Detroit Posts: 1,294 Drives: 09 370Z Red Sport-MT Rep Power: 18	Some much more experienced folks have chimed in already but the first thing I would have done in that instance was soften the rear sway bar. My first event of the year was my first on coilovers and with the rear bar at full stiff the car was very unpredictable and liked to step out mid-corner. (It put me 4 off twice! in one session) Dropped it to the middle setting and the car was much more predictable.

09-21-2012, 11:42 AM	#24 (permalink)
Ubetit Track Member Join Date: May 2012 Location: Ohio Posts: 527 Drives: the women lazy Rep Power: 14	I wouldn't put the rear sway on full stiff. I'm looking at the Whitelines and even on the softest setting, they are something like 30% stiffer. With the sways super stiff, you leave a lot up to the traction of the outside tire.

09-21-2012, 09:38 PM	#25 (permalink)
Dwnshift Track Member Join Date: Feb 2012 Location: Cincy Posts: 717 Drives: NISMO 370Z RC Rep Power: 14	I would have rechecked the toe. Toe in will not do what you were experiencing. There are sooooo many things it could be. Just as an FYI... Our front bar is 1.75" and our rear bar rates just a bit stiffer than stock Again.... Without knowing everything.... It could be anything.

09-21-2012, 11:32 PM	#28 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	That's what I was running (full stiff). Worked super great for me. But I believe the roll cage stiffened up the rear a lot. Never got to fully test my car after for the day I went to the track it was raining. definitely going softer setting. I'll get it right. It's definitely not the toe. __________________

09-22-2012, 12:41 AM	#29 (permalink)
threeseventy Track Member Join Date: Mar 2011 Location: Huntington Beach, CA Posts: 600 Drives: Opinion Rep Power: 15	In for updates!

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