Track Video Thread

[samthejam]

Why are my RS4s chunking on the rear inside?

Really fun footage of Jay and I doing some back and forth.

[samthejam]

1:38.52 Road Atlanta, didn't beat my PB but tried to give it my all to match my used A052 time with these used RS4s.

[samthejam]

New Personal Best at MSRH CW for me

Close call avoiding spin:
Timestamped Link:

https://youtu.be/KL12k8puD44?t=88

1:44.70

1:44.53

1:44.66 Same pace but with much more understeer on the LF, tires degraded overall

[Wernd]

Wernd

Thank you! This year is going to be interesting as I'm installing a cage and trying to make the move to w2w! I'm very interested in the Road America weekend with WC/Badger. Hopefully see you out there!

For that video I was in Gridlife Street class trim which means no aero and 285width RE71RS. Interior is mostly stripped behind the driver's seat, but for the class we have to keep front interior, carpet, etc. Probably weighs 3150 ish without me.

I won't be doing RA this year, it's a once a decade for me basically, I view it as just a braking exercise. I was there last year for O'Fast so I'm good for some time now.

Good luck with the w2w!

[bojangles]

Wernd

Thank you! This year is going to be interesting as I'm installing a cage and trying to make the move to w2w! I'm very interested in the Road America weekend with WC/Badger. Hopefully see you out there!

For that video I was in Gridlife Street class trim which means no aero and 285width RE71RS. Interior is mostly stripped behind the driver's seat, but for the class we have to keep front interior, carpet, etc. Probably weighs 3150 ish without me.

[Wernd]

Likely not, have an event that week at Mid Ohio and might be coming off of Gridlife Road Atlanta, depending on if my car is ready in time.

Would like to try a Windy City event, though. I've only ever done events with the Detroit chapter.

Motor city was good, I am not trying to sell WC BTW just asking. There's probably a reason it's gone from a well attended 3 day event down to just 2 days.......

Good luck at your events this year!

I'm curious, is your car gutted with a wing? What's it weigh and what tires were you on for that Autobahn video?

[bojangles]

That's impressive! Will you be at the WC event in May?

Likely not, have an event that week at Mid Ohio and might be coming off of Gridlife Road Atlanta, depending on if my car is ready in time.

Would like to try a Windy City event, though. I've only ever done events with the Detroit chapter.

[Wernd]

Finally getting around to uploading a few videos from last year - here's my latest attempt at Autobahn Country Club - South Circuit.

Pretty happy with getting into the 33s, but there's definitely more time in it.
Car was like skipping and bouncing the whole weekend, and i just couldn't solve it with damping and compression changes....you can see it very clearly in Turn 8, completely upsets the car at the apex and on exit. Also meant that i couldn't hit the curbs like normal.
Turns out that one of my rear shocks had lost all gas pressure....

https://youtu.be/rtpBRq15A1w

That's impressive! Will you be at the WC event in May?

[bojangles]

Finally getting around to uploading a few videos from last year - here's my latest attempt at Autobahn Country Club - South Circuit.

Pretty happy with getting into the 33s, but there's definitely more time in it.
Car was like skipping and bouncing the whole weekend, and i just couldn't solve it with damping and compression changes....you can see it very clearly in Turn 8, completely upsets the car at the apex and on exit. Also meant that i couldn't hit the curbs like normal.
Turns out that one of my rear shocks had lost all gas pressure....

https://youtu.be/rtpBRq15A1w

[Wernd]

I'm aware of the flat ride idea but it's above me honestly.

Stock front bar (I think I need the bimmerworld bar which will fit with their splitter)
No rear bar

I run the suggested by bimmerworld settings for my MCS coils. With the 1500 spring MCS recommended adding at minimum 4 clicks of rebound to the rear.

Honestly after the doghouse alignment the car felt almost perfect, it was rear limited but felt artificially low. So doghouse recommended lowering the canister pressures from 205 to 170. After driving that I was pulling 1.39 and 1.41g on a basically full interior and Re71rs tires. The car felt amazing but a bit too much roll so DH suggested adding 10psi to the front cans. After doing that the car felt almost perfect and I wanted to be done tuning and just drive.

My rear doesn't feel too stiff or anything like a pogo BTW

[bigjae46]

Yeah I saw your car, wish I had known you were a forum member!

1500 sounds high but with math it's actually a 653lb spring. The spring sits 2/3 the way out on the control arm that the shock does so it's 2/3 the spring rate, then the spring only compresses 2/3 what the shock does, so it's 2/3 of that.

1500x.66=990
990x.66=653

I know it sounds crazy but try it and you won't be disappointed. Or I should say try to match your front spring

My front is 750 so I may actually go higher in the rear

Did you look at the FCM spring rate calculator?

[bojangles]

Yeah I saw your car, wish I had known you were a forum member!

1500 sounds high but with math it's actually a 653lb spring. The spring sits 2/3 the way out on the control arm that the shock does so it's 2/3 the spring rate, then the spring only compresses 2/3 what the shock does, so it's 2/3 of that.

1500x.66=990
990x.66=653

I know it sounds crazy but try it and you won't be disappointed. Or I should say try to match your front spring

My front is 750 so I may actually go higher in the rear

This is very interesting. I tried 1100lb, and the rear was a pogo stick, even with significant rebound (no aero). Where is your rear rebound set? I'm guessing you are not running a rear sway?

Are you attempting to reach a "flat ride" approach where the rear bounce frequency is higher than the front? And a high front roll couple %?

You may also be able to approximate a higher spring rate by upping the canister pressure. I believe MCS canisters can go up to 275psi, could try raising yours a bit.

[Wernd]

1500, wow!

Nice laps. I was there too, still learning my new setup, but very fun on the 3.1. And I didn't get any data all weekend, but a buddy caught me mowing the grass. 🤪

https://youtu.be/uGp24ie5COg

Yeah I saw your car, wish I had known you were a forum member!

1500 sounds high but with math it's actually a 653lb spring. The spring sits 2/3 the way out on the control arm that the shock does so it's 2/3 the spring rate, then the spring only compresses 2/3 what the shock does, so it's 2/3 of that.

1500x.66=990
990x.66=653

I know it sounds crazy but try it and you won't be disappointed. Or I should say try to match your front spring

My front is 750 so I may actually go higher in the rear

[George Hill]

Dang...at least you didn't go flying off there sideways and out of control. That turn is scary.

I saw it coming, I was working on carrying speed through T5 and then coming into T6 if I don't plan my downshifts with my brake input properly it upsets the car and looses grip. I didn't want to go off side ways so I just committed to going for a ride 😅

[George Hill]

My buddy's wife was taking pics, I think this is your car Wernd ?