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      09-03-2020, 02:39 PM   #23
m3less
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Great thread, plenty of great info
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      09-03-2020, 04:17 PM   #24
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Thanks for all of the information in detail regarding your modifications. For my track- focused M2, I am running camber plates in front and a Ohlins R&T set up. We have the same suspension and obviously some difference in weight - I zeroed the toe at the rear and running about 1.5 degrees neg camber. This settled the car down significantly under high-speed braking prior to turn-in. Running -2.0 negative camber up front. Handling is quite neutral on R compound tires. Could use another -1 degree up front, but I drive the car on the street, also

I'm jealous of your brakes!
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      09-03-2020, 04:50 PM   #25
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Quote:
Originally Posted by gsrbri View Post
Thanks for all of the information in detail regarding your modifications. For my track- focused M2, I am running camber plates in front and a Ohlins R&T set up. We have the same suspension and obviously some difference in weight - I zeroed the toe at the rear and running about 1.5 degrees neg camber. This settled the car down significantly under high-speed braking prior to turn-in. Running -2.0 negative camber up front. Handling is quite neutral on R compound tires. Could use another -1 degree up front, but I drive the car on the street, also

I'm jealous of your brakes!
You must mean zero toe up front? Our cars toe out in the rear slightly under heavy braking. So the rear will feel darty with zero toe. I believe almost every car out there runs some amount of rear toe. Miata's run maybe 1/16" and heavy horsepower big tire cars might run 1/4" or more.
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      09-03-2020, 09:19 PM   #26
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Quote:
Originally Posted by gsrbri View Post
Thanks for all of the information in detail regarding your modifications. For my track- focused M2, I am running camber plates in front and a Ohlins R&T set up. We have the same suspension and obviously some difference in weight - I zeroed the toe at the rear and running about 1.5 degrees neg camber. This settled the car down significantly under high-speed braking prior to turn-in. Running -2.0 negative camber up front. Handling is quite neutral on R compound tires. Could use another -1 degree up front, but I drive the car on the street, also

I'm jealous of your brakes!
Just curious which half cage and rear seat delete is that?

Thanks
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      09-03-2020, 11:08 PM   #27
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Quote:
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Quote:
Originally Posted by gsrbri View Post
Thanks for all of the information in detail regarding your modifications. For my track- focused M2, I am running camber plates in front and a Ohlins R&T set up. We have the same suspension and obviously some difference in weight - I zeroed the toe at the rear and running about 1.5 degrees neg camber. This settled the car down significantly under high-speed braking prior to turn-in. Running -2.0 negative camber up front. Handling is quite neutral on R compound tires. Could use another -1 degree up front, but I drive the car on the street, also

I'm jealous of your brakes!
Just curious which half cage and rear seat delete is that?

Thanks
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      09-04-2020, 07:31 AM   #28
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Mark Mcmahan at McMahan Autosport in Akron, OH. Original crew member of TC Kline Racing And now greatest cage builder east of the Mississippi. The goal was a completely removable system with my wife’s safety in mind. The spreader plates off the main hoop are the size of the entire floor area in the rear. The seat delete or rear bulkhead is so simple yet so perfect. The fit is within 1mm of everything around it.

He normally does full on race cages in gutted cars but has done some cars with full cages and full interiors.
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      09-04-2020, 04:05 PM   #29
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Quote:
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Quote:
Originally Posted by gsrbri View Post
Thanks for all of the information in detail regarding your modifications. For my track- focused M2, I am running camber plates in front and a Ohlins R&T set up. We have the same suspension and obviously some difference in weight - I zeroed the toe at the rear and running about 1.5 degrees neg camber. This settled the car down significantly under high-speed braking prior to turn-in. Running -2.0 negative camber up front. Handling is quite neutral on R compound tires. Could use another -1 degree up front, but I drive the car on the street, also

I'm jealous of your brakes!
You must mean zero toe up front? Our cars toe out in the rear slightly under heavy braking. So the rear will feel darty with zero toe. I believe almost every car out there runs some amount of rear toe. Miata's run maybe 1/16" and heavy horsepower big tire cars might run 1/4" or more.
Just pulled-up my alignment specs. Dialed almost all the toe from the rear. Car is quite stable on turn-in, if a little lively, which is my preference in the M2.
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      09-04-2020, 07:06 PM   #30
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Well, if you were even more toed out before, than closer to zero would feel better. I’d still recommend trying toe in, as in the max BMW recommenced toe in. I think you’ll feel that you can get on the gas sooner coming out of corners and harder with more confidence.
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      09-05-2020, 02:18 AM   #31
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spring rates of 350fr/600rr... that's pretty soft for a track car with the tires you're running.
I would run 500-600fr/800-900rr with the setup you have... although I doubt those konis could handle it without revalving.
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      09-05-2020, 07:51 AM   #32
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spring rates of 350fr/600rr... that's pretty soft for a track car with the tires you're running.
I would run 500-600fr/800-900rr with the setup you have... although I doubt those konis could handle it without revalving.
We also feel a stiffer car would inspire confidence, however, TC Kline is prettty adamant that softer is the way to go. He might know a thing or two having an FIA/IMSA racing career, then moving on as a factory backed team owner, all before getting into the suspension parts business.

The car has seen track times at NCM down to 2:20 on 20+ heat cycle Toyo RR's with this setup. And it is repeatable with the wifey, myself, and our setup guy/ driving coach all being able to repeat personal bests quite easily.

Our goal was to make a car easy to drive and most importantly repeatable. I feel like it would be better to explore new tracks with a setup like this before going for all out best times. Until I see another F8X with a full interior and stock engine run lap times any quicker, who am I to say the setup needs to change. There is an M2 with tune, aero, DH scrubs, Ohlins R&T. Best time is 2:19... but repeatable? No! Always making damper adjustments, wing adjustments, with lap times all over the map. Some can be attributed to the driver having a bad day, but I think the car and setup itself has something to do with that.

Development work and track time must account for something.
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      09-17-2020, 05:43 PM   #33
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So I did a thing. Why not?

285/645-18 and 305/660-18 Pirelli DH Scrubs. Got them from JB Racing Tires. These sizes kinda keep the height stagger the same although the tires are shorter than stock.

Not really sure what to expect. Softened up the front bar per TC Kline and ran wife and I beat our best times in this car on RE71Rs. Not sure if the Toyo's are really all that. Or maybe it was the bar. So anyways, gonna try these.

FF62B4E9-5D3C-4144-A27C-8B284D06E0EF by D S, on Flickr
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      10-01-2020, 06:10 AM   #34
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If anyone is interested, here is a Blackstone report. The oil was Redline10w40 and had 4 track days on it (16 sessions). No street miles.

Redline has some very high moly and zinc additives. The most shocking number is the silicon. Running OEM paper air filters. And after 4 track days, there is more contaminant than a motor that has seen 4900 total miles.

f80blkstn by D S, on Flickr
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      10-29-2020, 07:10 PM   #35
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So, about those Pirelli's... after going through 2 sets of Toyo RRs, the Pirelli's finally made there way on. All I have to say is OMG! The AP brakes with DTC70 pads have finally met there match. On RE71Rs, the brakes would easily over power them, on Toyo RRs, it was a more even match up. But against the Pirelli's, the APs actually have to work a bit. Ambient temp on test day was 55 deg F and cloudy. The tires have grip for days! And are super consistent. My wife dropped 3 seconds from her personal best and was able to do so for 4 laps in a row. 3 laps being within 0.1 sec of one another.

So if you're not already on these tires, stop, do not pass go, get some!

8DDB58D7-F6F3-4C74-ABEE-F2C70FCADE0E by D S, on Flickr
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