Hi folks.
Why is the rear of the car that nervous? Does anybody know how to make the rear more planted not making the car understeer?

235 semislicks all around
2.5° camber 0 toe front
2° cambert 6mm total toe in


I KNOW this is something talked a thousand times but... is very difficult to drive it on bumpy tracks like nurburgring for example.

probably a bigger wing would help? But there are grip problems even at low speed !

kind regards

 

Try reducing your rear toe from 6mm (0.54°) total to something more like 2mm (0.18°) total.
Too much rear toe sucks, for everything. Makes the car hunt all around over bumps/undulations or in the wet when you want to go straight, but then gives you understeer when you want it to turn!

 

thanks for your help, I will modify the rear toe then and try again. What camber do you like to play around with? I thought more toe in more secure back.

 

My car is stock, so I'm limited to around -1° front, -2° rear. Ideally I'd like to run something like -3° front for track work. -2° rear is OK imo...

Yeah, that's what they told me, too... When I started tracking the S2k I ran the max-spec ~0.64° total rear toe-in that was recommended on these forums to tame the back end of the car and make it more stable. First event with the car (Watkins Glen) I found the handling to be a little sketchy and nonlinear, nothing like the linear predictability of my 240Z. Next event at Mosport I shared the car with a friend, and by day two the car was becoming undriveable it was so twitchy. By the end of that day the rears were corded
Not being able to live with that kind of wear rate, I went back to the alignment shop and asked for the min spec rear toe, or ~0.3° total, 0.15° per side. They misunderstood and gave me 0.15° total and I picked up the car too late to have it fixed, and was headed to the track next day. Given the sketchy handling of the car I had experienced, I was *really* worried how it would behave with so little rear toe in to "stabilize" it. What I found was that the car behaved *much* more linearly and was actually easier to drive. And rear tire life more than doubled
Fast-forward to a year later, I was running at Mont Tremblant in the rain. The car would dart left and right going down the straightaway, then it would understeer like mad when I wanted it to turn in at corner entry. WTF?! On the drive home in torrential downpour, again the car was unstable in a straight line, I had to drive at 45-50mph while others were doing 60. Scary... It also darted left/right going over bumps/undulations on the road. Had alignment checked when I got home, and it had shifted from very low rear toe to upwards of 1° total! That was the problem. Had them take it back down to 0.2° total and tighten the frick out of it, and all was well again with handling

In my experience, running a lot of rear toe-in has only ever made my car's handling *less* stable, *less* predictable, *less* fun to drive, and eroded the tires away at a ridiculous rate.

 

^
yup.

you could get a stiffer front sway bar, stiffer springs all around, run less rear toe.

this changed the dynamics of my ap1 considerably.

 

Ap2 rear sway bar. eBay always has them for 50 bucks. Softer than AP1, the rear will feel more planted.

 

235 semislicks all around. Too much grip in the front and not enough at the rear acerbates oversteer. The OEM staggered tire setup was not cosmetic. The original OEM front tires were 205mm in 16" and there was lots of oversteer with these and the early suspensions. The softer rear sway bar in the late cars (as in my 2006 for example) helps minimize oversteer and is worth a try if you insist on a square setup. As will a wider rear tire (for a lot more money).

-- Chuck

 

Guys run square setups all of the time on the track, the tire choice is not the issue. A square setup can be made to work on any S2000 and in terms of lap times will be faster than a staggered setup. I personally run a staggered setup, but don't like any miss information about how it is the tires

 

Well, as I have seen all the fast s2k are driven with 255 allaround or more.

I see now that more toe in doesn't mean more stability like for example on the 5th corner where probably I could handle the situation... modifying the tow.

next step is buying a front ARB and test.

the problem not to install a wider tire are the rims.

uploading a second video for comparison.

 

Low quality phone uploaded