mwood

At Marina running two events this weekend. ran with bmw club today and understeer is out of control. going to full soft stock bar. what else? pressure suggestions? car sux...

pda sorry

mwood

oh yeah...it's off corner as soon as I pick up th throttle. just can't steer with throttle or rotate the car. turn in is not quite as bad

fastmike

Not too much front toe out and zero the rear toe.
That should help some.
FM

Cooper47

I would try to balance it out with tire pressures. I would start with 45 in the rear and 35 in the front and see where it's at. Of course, like you mentioned earlier, it's tough to get a car to handle well at Marina. You would think some of the local guys would have figured it out.

ULLLOSE

iTrader: (1)

Just wait longer to step on the gas.

SouthFL

What are your car's alignment settings?

TeamRX8

iTrader: (25)

the bar won't help much in that situation

less rear camber
less rear toe
higher rear air pressure
more rear shock bump valving
possibly higher front air pressure if the corner rollover is too much
more front camber but you're probably maxed out

mwood

konis are full stiff rear. tried softening fronts, went too far started picking up inside rear. don' want to mess with alignment for one event, the car is good everywhere else. started at my normal 39f 37r ended up at 40f 36r...went wrong way? start at 38f 40r today and soften bar.
thnx

mwood

doesn't matter. still can't steer with throttle have to have wheel unwound before gas = slow

fastmike

"WAIT" is a very bad word to use!!!
You can easily mess with toe at the site for tuning for the surface/weather you are running at.
FM

SouthFL

What's your current alignment setup like? It would help us to answer your question.

mwood

Sorry, I was posting using my pocket PC earlier and hate typing on the Qwerty key board...didn't want to take time to clarify for all. I run the "normal" B Stock alignment. -1.7f/-1.8r, 1/8" toe out front/zero toe rear.

I was just looking for one of the other BS guys who already know my set up (like ULLLLLLLLLLOSE, who has fought this understeer problem on concrete...and was of no help ) to chime in with a quick fix, as I had a regional event today and discovered the issue yesterday. I figured that I needed a band aid fix, since I didn't really want to mess with the rear eccentrics and dial the car in for a surface which I (particularly now) have no interest in running on.

Anyhow, I did go to the softest setting on my modified stock bar and ran 39f/40r pressures to start. Big improvement, the car felt pretty darn good...unfortunately, the driver had problems, today. I don't think I even pax'ed top 10

Thanks for the help, though!

TeamRX8

iTrader: (25)

if your on V710s your front pressure is too low

balefire

iTrader: (2)

I hate the concrete plow mode. I've tried going from 43 psi to 35 psi in the rear and it didn't feel better really either way.

mwood

How do you figure? The roll over was right where I want it, about 1/16" of the shoulder surface is not being used.

SouthFL

I also noticed my car plowed some at Sebring (concrete) while it easily rotates at other tracks.

TeamRX8

iTrader: (25)

you must not be driving hard enough then we have to run 42-44 psig front pressure even on asphalt

but then I guess it depends what you're calling shoulder surface, when I looked at your 275 front HooHoos they were rolling way too far onto the sidewall IMO

mwood

^I must be much smoother and more precise with my inputs, I guess

Cooper47

Are you saying that using less of the tire creates more grip then more of the tire? That more flex in the tires creates less friction then a stiffer sidewall? Inquiring minds want to know?

Seriously, I'm a little lost with the 18's and uber short sidewalls....

TeamRX8

iTrader: (25)

Maybe too smooth and too precise because the people beating you are running that high too

mwood

Who? I believe Jason is right where I am, in terms of pressures

clyde

Perhaps J handles the pressures better than you?

mwood

I get it

One thing which did become clear to me this weekend is that the RX8, as many of us have them set up, is pretty sensitive to rear tire pressure...much more so than the Z06 I ran, for example. Raising rear pressures by 4 psi made a significant difference in the handling, more than I would have expected, freeing up the back end a bunch. On the other hand, dropping rear pressures really didn't do anything. I'm not sure what this all means (maybe someone can take a shot at quantifying), but it is good information to have learned.

TeamRX8

iTrader: (25)

all the pieces are right in front of you, you just have to put them together ...

mwood

please elaborate, sensei...I'm not really good at snatching pebbles from an open hand...