VR'92

I find this is one of the hardest things with my C4 when driving at the upper limits. The backend wants to lift and lift early.

As much as I love these cars I really wish the handling was better in stock form. Any idea?

http://www.axisofoversteer.com/Media...n_08262006.wmv

My brother is camera car in a BMW 325is while a unknown C4 takes a good spin. Happend over the weekend at Summit Point. Probably ruined his damn day.

WNDOPDLR

Could not get the link to work.

VR'92

Still works fine for me. Here it is in photobucket if anyone else is having an issue:

http://s75.photobucket.com/albums/i2...n_08262006.flv

2000BSME

FELNGR8

We had a short discussion about this spin over in C4 general. Can anyone here give us a likely reason that he lost it here?

Did he lift on the throttle at a critical point? Did he give it too much throttle too early? Does he have a chassis setup problem, or is there something worn like bushings?

We all experience the C4 rear end wiggle at unexpected times. So far I've made it through all of mine without wrecking, but don't want to trust to luck. Any advice?

TedDBere

My first impression was that he tracted out too soon, either by entering the turn too soon or too hot, or by early apex'ing. When he started to run out of exit space he slightly lifted and seems to try turning back in at the same time. Voila, spin. Watch the line of the car following him to see what I'm saying.

Vetracr

Looks like he went in too hot and then made the mistake of lifting. Been there, done that.

Larry

Falcon

Wow! The little red car behind the C4 missed hitting him by a RCH!

Do you know who the organizing group was for that event?

TedDBere

I can't believe you posted that...did you read my other post first? Two RCH references in the same day is just too hard to believe!

Falcon

Honest, I didn't see your other post, where is it?

That was a term we used frequently when I was in the navy,

MattW_VA

Odd, quite a lot of folks go off there and do just that-hard to tell with the red car in the way but looks like he may have pinched it-there's actually quite a lot of room there to track out if you don't mind getting in the dirt a little...

Slalom4me

Appears to be a bit of a crest past the apex.

Watching the C4, it seems to be tracking straight out to the apron
before disappearing from view in front of the Honda. It looks like it is
carrying speed rather than accelerating much as the gap between cars
does not change as much as its torque advantage could let it.

If the car was light from the crest and the driver lifted instead of
crusing (or accelerating to plant the rear) and the rear has insufficient
toe-in then it is possible the rear began to steer out. A human response
of lifting further, or worse - braking would just serve to create a
terminal spin. Heavy/full power to bring weight rearward to plant the
tires and induce squat that would toe-in the rear might have saved it.

My armchair opinion, anyway.

Anyone know the driver? It would be helpful to have first-hand
input.

.

Slalom4me

Wanted to add that there are some superb threads in the archives.

Go back and look at posts about the C4 by people such as Solofast,
fmrfast, Vetracr and DOCTOR J to name a few.

Here is a sampling
.

xsiveone

96LT1

That corner is well known for that. I'd say he felt the car get light, thought it was going to slide out and lifted. You have to drive through that corner. A number of guys with C4s shortshift to 4th so they don't have quite as much torque going through there.

Slalom4me

I think there is a bump somewhere near the apex, maybe in addition to
a crest or a transition from concrete to asphalt on the corner exit.

In an '05 video in the C4 General thread (where another C4 spun
and reportedly flipped) the camera car has 500 lb springs and at
the corner, the camera joggles enough for there to be a momentary
interruption.

.

gonzalezfj

The RCH is an official unit of measurement known to every mechanical engineer in this country. Red because they are thinner than any other color (this fact has been established through extensive research).

Frank Gonzalez

VR'92

Update on the info:

"the C4 was race-prepped (including r-compound tires) and the film is from the middle of a NASA club race last Saturday, not a HPDE."

UstaB-GS549

I would check for toe-out at full suspension droop at rear. Normally, drop throttle oversteer is a mid/rear engine car phenomenon.

loiq

That little GTI or whatever was behind him was giving him a run for his money!