Sebring, BRZ & Tarmac II's

[Opie]

So I'm attending my first HPDE in a twin and was wondering if anyone had any setup recommendations for one running RCE Tarmac II's. (Bump & Rebound).


All my previous HPDE's were in a 3,600lb AWD understeering pig (in the background of the pic below) so the transition to a RWD over-steering BRZ should lead to a fun weekend.

[FirstWinter]

The settings in the manual are a good starting point. Tune to preference/track from there. Since Sebring is a bit bumpy you might want to bump back compression/rebound a couple clicks. Of course the rest of your setup will also determine how your dampers are set.

[Jamestl]

Opie... do you work at a subie dealer?

I bought your LGT if you are who I think you are...

[Opie]

Originally Posted by Jamestl

Opie... do you work at a subie dealer?

I bought your LGT if you are who I think you are...

I do, I sold my ABP LGT to a guy from New York in 2010...was wondering if it would ever surface again. Still in good shape?

[Racecomp Engineering]

I's start here and add bump in 2 click increments. I would NOT rely on rebound to calm the car thru turns 17 and 1. Seems like backwards thinking but it works.

Front rebound 10 clicks ( from full stiff)
Front bump 12 clicks

Rear rebound 13 clicks
Rear bump 8 clicks.

Randy Pobst ran the Chin Motorsports car there and loved it. That car DID have 500 lb springs on it and ran close settings to this but with 3 clicks MORE bump damping.

Myles

[Opie]

Thanks Myles! I actually had the Chin car at my house for a few months (I fixed a tranny issue for them that came up at the May Sebring event) and loved it, I am building my BRZ using a lot of info I learned from the Chin car.

My BRZ is currently set as you listed above, alignment & corner balancing was done today. Ready to go get some seat time in a week and a half.

[smg1138]

Originally Posted by Racecomp Engineering

I's start here and add bump in 2 click increments. I would NOT rely on rebound to calm the car thru turns 17 and 1. Seems like backwards thinking but it works.

Front rebound 10 clicks ( from full stiff)
Front bump 12 clicks

Rear rebound 13 clicks
Rear bump 8 clicks.

Randy Pobst ran the Chin Motorsports car there and loved it. That car DID have 500 lb springs on it and ran close settings to this but with 3 clicks MORE bump damping.

Myles

Thanks for that info, Myles. Do you remember the ride height and camber settings when Randy drove that Chin Motorsports car?

[Jamestl]

Originally Posted by Opie

I do, I sold my ABP LGT to a guy from New York in 2010...was wondering if it would ever surface again. Still in good shape?

A guy from New York is me Moved to Chicago about two years ago.

I sold the car about two years after I bought it from you. Added a DP and TMIC and a tune for a little more power, but left it pretty much as is otherwise. It was very tastefully modified so I didn't need to do anything.

Looks like we both wanted to move to something lighter and more fun! I got my FRS a few months ago and have taken it to a couple of track events. A ton of fun so far.

Good to reconnect again!

[Racecomp Engineering]

Originally Posted by smg1138

Thanks for that info, Myles. Do you remember the ride height and camber settings when Randy drove that Chin Motorsports car?

They're posted somewhere in the suspension forum, but I'd have to dig for them. They're surprisingly not that aggressive.

- Andrew

[FirstWinter]

Originally Posted by Racecomp Engineering

They're posted somewhere in the suspension forum, but I'd have to dig for them. They're surprisingly not that aggressive.

- Andrew

Found the set up that Randy drove. From the earlier pages in the thread the spring rates seem to be 560 lb/in (10k) - they are running NT01s.

I've been thinking about going from 400/400 on my T2s to something stiffer like 504/616 (9k/11k). You have any experience with that set up on the T2s? I'm looking for a little bit more rotation and it still isn't quite there with the Perrin RSB I have on now. I might play with the damper settings this weekend though to see if I can get it just where I want it.

[Racecomp Engineering]

Originally Posted by FirstWinter

Found the set up that Randy drove. From the earlier pages in the thread the spring rates seem to be 560 lb/in (10k) - they are running NT01s.

I've been thinking about going from 400/400 on my T2s to something stiffer like 504/616 (9k/11k). You have any experience with that set up on the T2s? I'm looking for a little bit more rotation and it still isn't quite there with the Perrin RSB I have on now. I might play with the damper settings this weekend though to see if I can get it just where I want it.

I believe he was on the standard 400/400 rates, and added the stiffer springs later.

- Andrew

[renfield90]

Originally Posted by FirstWinter

Found the set up that Randy drove. From the earlier pages in the thread the spring rates seem to be 560 lb/in (10k) - they are running NT01s.

I've been thinking about going from 400/400 on my T2s to something stiffer like 504/616 (9k/11k). You have any experience with that set up on the T2s? I'm looking for a little bit more rotation and it still isn't quite there with the Perrin RSB I have on now. I might play with the damper settings this weekend though to see if I can get it just where I want it.

500/600 is my current T2 setup (autocross application FYI). It does rotate better than my old 400/500 setup, to the point that I actually took some rear bar out. Definitely worth a shot.

[FirstWinter]

Originally Posted by renfield90

500/600 is my current T2 setup (autocross application FYI). It does rotate better than my old 400/500 setup, to the point that I actually took some rear bar out. Definitely worth a shot.

I use the car primarily on the track. Don't do as much autox anymore. I was looking at starting with 500 lb in the rear and tuning from there with the rear swaybar. I'll definitely give it a try first before going higher.

[Pat]

Originally Posted by Racecomp Engineering

I believe he was on the standard 400/400 rates, and added the stiffer springs later.

- Andrew

Man, that just seems like a setup that would understeer much more than I would want and certainly more than my car does. Even with 1* more camber in the front than the rear and no toe my car on T2s with standard springs and suggested settings understeered more that I like.