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NorseDave
NorseDave HalfDork
4/18/23 7:18 p.m.

I would love to see the MM / Revival start to gradually include newer stuff.  Like a rolling cutoff of ~40 years?  Like, will we ever get to see a late '80s / early '90s DTM race with M3's and 190 Evo's ??

Tom1200
Tom1200 UberDork
4/18/23 8:57 p.m.
Keith Tanner said:

Man, the slip angles on those Minis with the 10" wheels are just so delicious.

This is what appeals to me as a vintage racer; I want to experience those huge slip angles. One of my fellow Datsun racers in describing my driving style to his daughter said "he drives like those Minis you see racing at Goodwood".

While driving in this manner is the fastest way round in these old cars I will admit it's soooo much more fun than a modern sedan......well at least for me anyway.

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
4/18/23 9:18 p.m.

Isn't the slip angle a function of the tyre type? It's also a way to save the brakes, just pitch it in and scrub the speed off :) I know I've used that technique in the past. 

AnthonyGS (Forum Supporter)
AnthonyGS (Forum Supporter) UberDork
4/18/23 9:40 p.m.

My favorite Goodwood thing sounds like this.

 

adam525i
adam525i GRM+ Memberand Dork
4/18/23 9:46 p.m.
Keith Tanner said:

Isn't the slip angle a function of the tyre type? It's also a way to save the brakes, just pitch it in and scrub the speed off :) I know I've used that technique in the past. 

It's the difference between radials and bias-ply tires
 

 

Pete. (l33t FS)
Pete. (l33t FS) GRM+ Memberand MegaDork
4/18/23 10:04 p.m.
Keith Tanner said:

Isn't the slip angle a function of the tyre type? It's also a way to save the brakes, just pitch it in and scrub the speed off :) I know I've used that technique in the past. 

The other effect, that I can't find right now, is that the lower the tire profile is, the peakier the slip angle curve.

So donut shaped tires, bias ply tires, and especially donut shaped bias ply tires, will have fat, long, lazy slip angle curves that reward driving in a manner that would have a rubberband radial equipped vehicle spun off into the weeds.  They aren't really "sliding" so much as trying to get maximum grip from the tires.

Keith Tanner
Keith Tanner GRM+ Memberand MegaDork
4/18/23 10:31 p.m.

That's what I thought, thanks. 

Tom1200
Tom1200 UberDork
4/18/23 11:13 p.m.

In reply to Keith Tanner :

I run a basis ply tire as well. In my case it's Hoosier TDs. Pete's explanation is pretty spot on.

I think a lot of the cars in the UK run Avon ACB9s or similar. I've run those and they are hilarious fun. They do indeed have a ton of wind up.

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