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      04-16-2018, 01:49 PM   #155
berns
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Originally Posted by Ginger_Extract View Post
1:34 at Big Willow is moving. Went there recently for the first time in years. Ran 1:35 in the first session...and corded ANOTHER Nexen SUR4 in the second session. You're lucky you haven't run into wear issues. These tires are fast, but total junk.
Try the Sur4G next? I loved mine and they wore beautifully. I still have my 255s here that had a few days on them. They look good and I'll keep them around for drift scrubs I think.

The RT615k+'s have definitely started to wear down from 2 track days and road miles to/from the track. I'd say I have another 3 days on them though.

Next tire will be the BFG Rival S, 245 front, 275 rear, until I go wide. Then I'll do them in 275 squared. These BFG's run SUPER wide. 275s look like 305s. If you look closely, my buddy in the E46 is running them on a 9.5" wheel out back, compared to my 9.5" wheel with the Falken 275s.

Forgot to mention another change that has really helped make the car super neutral and fast. I'm now running 8k front springs and 12k rear, as opposed to the 6k's I had before. Front end feels much better, more responsive and the rotation is super predictable now. I'd like to keep this split, revalve my shocks and go up to 10k/15k but I'm going to leave the car as is now, because it's the best it's ever felt. Can't wait for -3.5* up front though! I think that'll be a game changer.
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      04-16-2018, 05:29 PM   #156
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Try the Sur4G next? I loved mine and they wore beautifully. I still have my 255s here that had a few days on them. They look good and I'll keep them around for drift scrubs I think.

Have a leftover set of Hankook RS3 from 2015, will run on those and then figure it out. Probably going to try RS4. I have no faith in the Nexens. Cording tires every 1.5 track days fucking sucks, and is a massive waste of money.

The RT615k+'s have definitely started to wear down from 2 track days and road miles to/from the track. I'd say I have another 3 days on them though.

How do these compare to the SUR4G? No real data out there on the Falkens.

Next tire will be the BFG Rival S, 245 front, 275 rear, until I go wide. Then I'll do them in 275 squared. These BFG's run SUPER wide. 275s look like 305s. If you look closely, my buddy in the E46 is running them on a 9.5" wheel out back, compared to my 9.5" wheel with the Falken 275s.

The BFG's run wider than the Nexens? If so, holy shit. These 265 Nexens are way oversized for a 9.5" wheel. Going to try a 10" wheel fitment soon.

Forgot to mention another change that has really helped make the car super neutral and fast. I'm now running 8k front springs and 12k rear, as opposed to the 6k's I had before. Front end feels much better, more responsive and the rotation is super predictable now. I'd like to keep this split, revalve my shocks and go up to 10k/15k but I'm going to leave the car as is now, because it's the best it's ever felt. Can't wait for -3.5* up front though! I think that'll be a game changer.
We need to grab a drink in person and shoot the shit about these cars. Have some ideas I want to bounce off someone.
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Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18
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      04-16-2018, 05:52 PM   #157
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Quote:
Originally Posted by Ginger_Extract View Post
We need to grab a drink in person and shoot the shit about these cars. Have some ideas I want to bounce off someone.
Come hang dude.

My 255 nexens were wide but pretty perfect on a 9" wheel.
The BFGs are seriously stupid wide. I'll update once I fit them.

Can't believe how terrible your experience was on the Nexens. How many track days did you try to get out of them? Our cars are probably harder than most on street tires due to big weight, big speed and big horsepower.

The RT615k+ was not so fun at Buttonwillow on a 90* day when brand new. But I was really, really impressed with them at Big Willow on a 70* once they'd been tracked once. I did 10 lap sessions and was still grooving. Thing my PB was on lap 6, which is impressive.
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      04-16-2018, 06:51 PM   #158
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Originally Posted by berns View Post
Come hang dude.

My 255 nexens were wide but pretty perfect on a 9" wheel.
The BFGs are seriously stupid wide. I'll update once I fit them.

Can't believe how terrible your experience was on the Nexens. How many track days did you try to get out of them? Our cars are probably harder than most on street tires due to big weight, big speed and big horsepower.

The RT615k+ was not so fun at Buttonwillow on a 90* day when brand new. But I was really, really impressed with them at Big Willow on a 70* once they'd been tracked once. I did 10 lap sessions and was still grooving. Thing my PB was on lap 6, which is impressive.
I went through 2 pairs of SUR4 rear tires in 3 events combined. Both times, the outside edge of the rear tires corded. Tons of meat on the rest of the tire. Seems like sidewall squirm and "only" -2.3* of camber killed them. This was with cool down laps. Never had rear tire wear issues until I used the Nexens.
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Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18
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      04-16-2018, 07:56 PM   #159
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Come hang dude.
Yup, That's a conversation I'd like to listen in on
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      04-17-2018, 09:06 PM   #160
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Someone earlier in the thread had mentioned the amount of steering input seemed to be too much vs the turn angle. I thought so too. Took me a little to find why, knew I'd read about it before ...

http://www.1addicts.com/forums/attac...6&d=1395978128

From post --> http://www.1addicts.com/forums/showp...2&postcount=23


Basically the high static negative camber is fighting you. To make up for it you naturally go to a stiffer spring, which is actually the opposite of what you want to do. What you actually want to do is reduce static negative camber and go to a softer spring. Allow the camber/toe gain/loss to work.


Let's talk about this for a second. I've noticed it lately on my car as well, running -2.8* up front. Even with an M3 rack, the amount of steering input I need while daily driving is conspicuous. The car seems to handle fine on track.

So, what do I want to do here? Everyone always talks about getting -3* up front, wouldn't that just exacerbate the issue?

Berns, what's your take?
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      04-18-2018, 01:51 AM   #161
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Originally Posted by ajsmithvmi View Post
Let's talk about this for a second. I've noticed it lately on my car as well, running -2.8* up front. Even with an M3 rack, the amount of steering input I need while daily driving is conspicuous. The car seems to handle fine on track.

So, what do I want to do here? Everyone always talks about getting -3* up front, wouldn't that just exacerbate the issue?

Berns, what's your take?
Read through the links and data. Sure, bump steer is a factor. But running less overall camber to work the wheel less, at the expensive of grip, makes no sense to me. My steering feels perfectly fine and predictable to me. The car goes where I want it until the front end looses grip and starts to push. More camber will help that.

Run less static camber? Softer front springs? Why would I want to do that? Static camber is the starting point, and for a short wheelbase car that loves to understeer at the limit, both low speed and high speed corner exit, more negative camber will be hugely welcomed.

I'm currently stuck at -2.8* static, with Vorshlag camber plates and M3 front lower control arms. I finally have the car set up to being pretty neutral, responsive and controllable, so I'm confident that -3.5* will really send this setup home. The whole crazy soft spring rates everyone runs on these cars seem to make less and less sense to me as time goes on. It is a heavy, heavy car. I want to go stiffer still. Swapping the 6k fronts for 8k's got the rear end in-check, stopped the front from bottoming out, and improved front-end grip all around.

The 8k/12k split feels awesome, and I'd like to go up from here but keep the split. Might have my KWs revalved and go for 10k/14k.

About the camber -- I'm working with SPL Parts at the moment to test out their front lower control arms and make sure there's enough adjustment to go from -2.8 to -3.75/-4. Updates this week or next. I will say, though, these arms are BEAUTIFUL. More soon.
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Last edited by berns; 04-18-2018 at 01:16 PM.
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      04-18-2018, 01:51 PM   #162
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I read through the in depth analysis that fer1x did, but wanted to get your take on it. I agree that stiff springs and -3* feels good on track. Predictable and holy hell does the car want to rotate now. Good to hear your experience matches mine.
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      04-18-2018, 02:07 PM   #163
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Quote:
Originally Posted by ajsmithvmi View Post
I read through the in depth analysis that fer1x did, but wanted to get your take on it. I agree that stiff springs and -3* feels good on track. Predictable and holy hell does the car want to rotate now. Good to hear your experience matches mine.
And matches most other cars and BMWs on track... Cars and chassis are all unique but the general base of knowledge is still applicable. This isn't some crazy vehicle. I'm going to go from -2.8 to -3.5 and see how I feel.
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