I am running 17" Kumho Ecsta Supra's on my DC5, and when i take lazy corners at high speeds, i feel my rear end drifting around. What could i do to solve this problem (its stock except for a tiny drop and rims and tires). What tire pressure could i put in the back to help it stabilize?

 

Get an alignment and have them toe it in in the back if its really a problem. Oh, and stop lifting in the middle of a corner. No idea what kind of pressures to suggest since you didn't put in what sort of motorsport you're participating in, and what wheel/tire combo you're using.

Just in case: IBTL (I just have a feeling about this)

 

What's a lazy corner? I'm assuming we're talking about some kind of large radius sweeper, but if it's a decreasing radius then krshultz might be right, quit lifting. As for pressures, there's no way to answer that question. What's the "tiny drop?" New springs? What rate? What tires? Blah, blah, blah.

 

lazy corner = large radius, long apex, etc. etc.

ill just resay it all:

i was taking a very long, lazy right hander down on our local mountain today. As I was going through the corner, i realized my rear was sliding out from under me. I decided to let off the gas a little and not accelerate so hard through the corner. After i got home, I remembered that I set the tire pressures to 44 the previous day, which seemed a little high to me.

My car has 17" 5Zigen GN+ rims with Kumho Supra Ecsta tires in 225/45. It is lowered on Tein S. Techs which gives it just a tiny drop (about 1.3" in the front, 1.2" in the back.)

Would lowering the tire pressures help a lot, or would I need to do something else, such as tightening up the car (and if so, where? rear upper or rear lower?)

 

Oh boy. Here we go.

Anyway, I'm feeling helpful this evening so I'll throw this in.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Atlas &raquo;</TD></TR><TR><TD CLASS="quote">I decided to let off the gas a little and not accelerate so hard through the corner.</TD></TR></TABLE>

That's the problem. When you let off the gas you're "lifting." And that transfers weight to the front of the car just like braking. Where does that weight come from? The back of the car. Which means less traction, which means, apparently, the rear of your car moving around on a "mountain road."

You should stop driving like this on public roads. Unlikely as it sounds, you could hurt yourself or someone else. Take it to the track (a road course, an autocross...read the FAQ)

I hope the other folks on here are as nice to you as I have been (but somehow I doubt that...get ready...)

IBTL x 2

 

I rented "The Human Stain" tonight and ran across this gem of a line...

"People are getting dumber, but more opinionated."

Well, I guess that about wraps it up.

 

So you had 44 in the back and not in the front, or both? (either way.. 44 psi will reduce your contact patch a good bit and could cause some oversteer)

And we know you lifted already.. so a racing type tire pressure set-up and that got you in a little trouble.

Find an autocross or track day though.. i have seen over the edge of some mountians, I promise cones and grass fields are much beter to find out about mistakes in than trees and dropoffs.

For a track day or autocross.. run 35-38 front and 40-42 rear to start.


Jon K
http://www.seat-time.com

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Atlas &raquo;</TD></TR><TR><TD CLASS="quote">Would lowering the tire pressures help a lot, or would I need to do something else, such as tightening up the car (and if so, where? rear upper or rear lower?)</TD></TR></TABLE>

Unless you want the back end to step out even faster, don't "tighten up" the rear. ibtrj

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Catch 22 &raquo;</TD></TR><TR><TD CLASS="quote">
"People are getting dumber, but more opinionated."
</TD></TR></TABLE>

Do you really think that is true? I wonder if people are more opinionated, or if there is just more people out there who are listening. There has to be some reinforcement for being opinionated, or maybe it's a reinforcement for being dumber. Dunno.

-travis, who is both dumber and more opinionated after participating in this thread.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by krshultz &raquo;</TD></TR><TR><TD CLASS="quote">You should stop driving like this on public roads. Unlikely as it sounds, you could hurt yourself or someone else. </TD></TR></TABLE>

You've never had a drive at a brisk pace through some empty roads?

Anyways, wrong forum.