Man I am stumped. Maybe you really do have that much extra grip from the 245/275 V710 combo. I guess the next step would be to try the solid center section for the bar. In a couple weeks some other members here should have some findings with the same tire setup, we'll see if it's a problem or not.

Just out of curiosity, how far off the ground are you picking up the inside rear?

Peter

 

Just barely, I think. I saw a bit of daylight when my son drove; I was shocked. But I felt the wheel spin perhaps 5 times in the course, a very, very tight course.

 

Interesting update.

I did an autocross in the rain on Sunday. Horrible handling, even considering the conditions; rear end all sorts of loose.

Today, I took off the tires from Sunday, and was going to soften the front bar for street use, especially since I'm putting on snow tires, and it's always wet here for the next 7 or 8 months.

Well, the bolt that holds the bushing tight onto the bar, on the left side, had disappeared, and the bushing was no longer functioning. So my bar was moving pretty freely on the left side.

Two questions:

What kind of problems would I see from this?

If this was a long-standing condition that I hadn't seen before, could it be softening up the chassis enough to have caused the inside rear wheel spin?

Thanks. Live and learn, I guess....

 

That's definitely the cause of your problem -- without that bolt holding the bracket in place, your front bar's essentially useless. Andy Howe / shaggy and I had the same problem at last year's Nationals Warm-Up -- the bolt just backed itself out somewhere between Portland and Topeka. I'd make sure you have thread lock on the replacement bolt.

Steve

 

If the bolt has been backing out over the last few months, that would be the cause of the wheelspin. No doubts here.

Steve is being generous about our issues last year... I had the bolt fall out en-route to Topeka, he had problems at the Warm-Up. I think Steve's quote when he came in from his first run was something to the effect of, "The car is broken. I got wheelspin everywhere!" Thankfully, my Nationals kit involves a spare kitchen sink (you didn't know the S2k had a kitchen sink?) and we were back on course 10 minutes later. And FYI... a similar thing happens when that bracket breaks at a track day.

Andy

 

Andy and Steve, thanks for the quick response.

Unfortunately, of course, I won't have a dry autocross run for four or five months in which to see about this, but I'm now fairly confident that this was the source of my problem.

 

Damn... I told you that something was not right. Glad you found it.

Peter

 

You sure did; I just didn't look hard enough. Thanks for helping!

 

I have posted this info before but none seemed to believed my word . You can run stock rear bar in a softer setting by just unbolting the end links of the bar , which by factory are bolted with the bolts facing inwards , and bolt them the other way , mounting bolts facing outwards . Doing that is decreasing the motion ratio of bar movement to wheel movement and thus simulating a thinner bar . I have the formula somewhere but I'm too busy now to do the math and tell you the percentage change in roll stiffness . In high speed runs is necessary to adjust rear shock if possible when using this option , in order to maintain control of the rear end and to limit excessive toe changes which make the car feel unstable . Another option to fight inside rear wheel lift is by mechanically raising the outside front . In our car which uses a negative front offset design ( too negative ) this can be done by increasing the front caster , although in cases of clearly seeing the wheel lifting I dought it can help .

 

Hello all, new here, just picked up an '05 and plan to run it in AS. Very interesteing thread, I was very worried at the begining, inside wheel spin, and I'm hoping the bolt was the cause. I'm also glad to hear the front bar helps a lot.

124pider, any rubbing issues running 245/275 710s? And what wheels do you guys recommend? Sorry if this is a little OT, I'm still learning my way around here. Can't wait 'til this break-in period is over! In FL, this is the best time to autox/track our cars!

Jamal