Holy Understeer!

Hotrodz · 07-17-2018, 04:34 PM

Quote:

Originally Posted by igota21incher

How is that even possible? No understeer?

You just go straight and then make a granny turn to the left or right!

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Tractionless · 07-19-2018, 07:13 AM

Quote:

Originally Posted by Rusty

Toe in inches is the old way. The way I was taught doing alignments many years ago. Also toe in inches is affected by size diameter. Where in degrees is off of vehicle center line. Tire diameter won't affect it.

So 1/16" toe in with a 27" tire is .1326288 deg total toe. Or .0663144 deg for one wheel.

For the rear toe. A lot of the track rats here run close to zero toe on the rear. Helps the car rotate.

255 front, 325 rear, and no understeer? You really haven't pushed all that hard.

Thanks for explaining the inches measurement, interesting substitute.

I guess understeer is subjective. Sure if I go 100 mph into a round about I'll get understeer but for the purposes of the OP, which are spirited street/twisties driving I do not have any.

Give me a legitimate scenario to test and I'll do so. As mentioned above, such a test won't be 100 mph into a round about as the most track savy Z on this forum will even understeer in such a circumstance.

Hotrodz · 07-19-2018, 08:33 AM

Quote:

Originally Posted by Tractionless

Thanks for explaining the inches measurement, interesting substitute.

I guess understeer is subjective. Sure if I go 100 mph into a round about I'll get understeer but for the purposes of the OP, which are spirited street/twisties driving I do not have any.

Give me a legitimate scenario to test and I'll do so. As mentioned above, such a test won't be 100 mph into a round about as the most track savy Z on this forum will even understeer in such a circumstance.

You don't have to be traveling at a 100 mph to have understeer. Understeer is when you turn the wheel and the car continues to go straight and adding addition input or turning does not help in getting the car to turn. I NASCAR they call it push because car wants to push through the turn. So Rusty's comment that you aren't driving hard enough refers to how aggressively you take a turn and that can be at 15 mph. It is about your inputs, speed into the corner and power out of said corner. So with your tire combination and the weight of the front end of the Z it is going to understeer when driven hard or at the limit for your tire and alignment setup.

igota21incher · 07-19-2018, 10:59 AM

Quote:

Originally Posted by Hotrodz

You don't have to be traveling at a 100 mph to have understeer. Understeer is when you turn the wheel and the car continues to go straight and adding addition input or turning does not help in getting the car to turn. I NASCAR they call it push because car wants to push through the turn. So Rusty's comment that you aren't driving hard enough refers to how aggressively you take a turn and that can be at 15 mph. It is about your inputs, speed into the corner and power out of said corner. So with your tire combination and the weight of the front end of the Z it is going to understeer when driven hard or at the limit for your tire and alignment setup.

This.

2011 Nismo#91 · 07-20-2018, 09:50 AM

Quote:

Originally Posted by Hotrodz

You don't have to be traveling at a 100 mph to have understeer.

But its more fun when you are.

https://youtu.be/Mmgk-LvZdfc

( Click to show/hide )

Rusty · 07-20-2018, 11:03 AM

Dead video.

Hotrodz · 07-20-2018, 11:19 AM

Quote:

Originally Posted by Rusty

Dead video.

Hmmm, worked for me!

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igota21incher · 07-20-2018, 11:04 AM

Now imagine that happening on the street with no cushy grass shoulder to soften your misstep

Hotrodz · 07-20-2018, 11:20 AM

Quote:

Originally Posted by igota21incher

Now imagine that happening on the street with no cushy grass shoulder to soften your misstep

This is what I think happened to Cupcakes!

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Rusty · 07-20-2018, 11:38 AM

Quote:

Originally Posted by Hotrodz

This is what I think happened to Cupcakes!

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I keep getting an error message.

JARblue · 07-20-2018, 02:16 PM

Quote:

Originally Posted by 2011 Nismo#91

He used the YOUTUBE tag incorrectly. Needs to take out the domain portion and just use the individual video identifier at the end of the URL. I fixed it above.

Rusty · 07-20-2018, 04:32 PM

3 years ago at ZDayZ. The wifey and me did a poker run there. On a couple of the back roads with down hill switchbacks. I had understeer.

The wifey ask me if I blew the turn. And I said no. The front just drifted a little more then what I wanted. I didn't want to tell her I was too hot for the turn, and I BLEW IT!

That's something I don't want to do on the street. Track is another thing. You got no one coming at you. I blew turn 1 at Pitt International North Course. Coming down the front straight at about buck thirty . Grap 2 down shifts, hard on the brakes. Let up on the brakes some, turn the wheel to the left. And keep going straight.

Rejoin the track between turn 3 and 4. I went farming.

This was towards the end of the session. About 20 minutes into it. Overheated the tires and they get GREASY.

Tractionless · 07-20-2018, 05:12 PM

Quote:

Originally Posted by Hotrodz

You don't have to be traveling at a 100 mph to have understeer. Understeer is when you turn the wheel and the car continues to go straight and adding addition input or turning does not help in getting the car to turn. I NASCAR they call it push because car wants to push through the turn. So Rusty's comment that you aren't driving hard enough refers to how aggressively you take a turn and that can be at 15 mph. It is about your inputs, speed into the corner and power out of said corner. So with your tire combination and the weight of the front end of the Z it is going to understeer when driven hard or at the limit for your tire and alignment setup.

I think I know a little about vehicle dynamics, no definition needed. And to repeat, regarding the OP's street scenario; I have no understeer.

Eagle · 07-20-2018, 06:52 PM

Quote:

Originally Posted by 2011 Nismo#91

But its more fun when you are.

https://youtu.be/Mmgk-LvZdfc

( Click to show/hide )

Coming in hot!!!! Good job on keeping it collected while mowing the lawn and away from the wall though.

markesc · 07-21-2018, 03:05 PM

My lowly 100% stock settings keep me in control on the streets. We're perpetually stuck behind suv/cuv drivers here in Portland, so it's rare to actually enjoy any corners, BUT, is the conscensus that aside from tire choice, is the front sway bar the next best thing?

I actually like the compliance of the stock suspension / or have just learned to live with it

07-20-2018, 11:03 AM	#6 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,341 Drives: 2011 Nismo GM 6M Rep Power: 2684438	Dead video. 2011 Nismo#91 likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

07-20-2018, 11:04 AM	#8 (permalink)
igota21incher Base Member Join Date: Dec 2008 Location: new york Posts: 100 Drives: 07 civic Rep Power: 17	Now imagine that happening on the street with no cushy grass shoulder to soften your misstep 2011 Nismo#91 likes this.

07-20-2018, 04:32 PM	#12 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,341 Drives: 2011 Nismo GM 6M Rep Power: 2684438	3 years ago at ZDayZ. The wifey and me did a poker run there. On a couple of the back roads with down hill switchbacks. I had understeer. The wifey ask me if I blew the turn. And I said no. The front just drifted a little more then what I wanted. I didn't want to tell her I was too hot for the turn, and I BLEW IT! That's something I don't want to do on the street. Track is another thing. You got no one coming at you. I blew turn 1 at Pitt International North Course. Coming down the front straight at about buck thirty . Grap 2 down shifts, hard on the brakes. Let up on the brakes some, turn the wheel to the left. And keep going straight. Rejoin the track between turn 3 and 4. I went farming. This was towards the end of the session. About 20 minutes into it. Overheated the tires and they get GREASY. Eagle, 2011 Nismo#91, Hotrodz and 1 others like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

07-21-2018, 03:05 PM	#15 (permalink)
markesc Enthusiast Member Join Date: Apr 2014 Location: Utah Posts: 381 Drives: 2014 370z M.B. 7AT Rep Power: 3366	My lowly 100% stock settings keep me in control on the streets. We're perpetually stuck behind suv/cuv drivers here in Portland, so it's rare to actually enjoy any corners, BUT, is the conscensus that aside from tire choice, is the front sway bar the next best thing? I actually like the compliance of the stock suspension / or have just learned to live with it Eagle likes this.

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