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M3 Track: Racing and DE Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start!


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Old Sat, Dec-01-2018, 02:28:36 AM   #1
muhli
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Default Spring rates for track car

The m3 is slowly becoming a track car as the only time I ever get to drive it now is on the track.

Getting coilovers soon as I've been running on stock suspension for a while now. Was wondering is it better to slowly increase the spring rate as I progressively get better? Or is it best to jump into spring rates specifically for a track car?

Coilovers I got were MCS s/a 600f/750r
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Old Sat, Dec-01-2018, 02:32:27 AM   #2
Kwakjoe
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Default Re: Spring rates for track car

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Originally Posted by muhli View Post
The m3 is slowly becoming a track car as the only time I ever get to drive it now is on the track.

Getting coilovers soon as I've been running on stock suspension for a while now. Was wondering is it better to slowly increase the spring rate as I progressively get better? Or is it best to jump into spring rates specifically for a track car?

Coilovers I got were MCS s/a 600f/750r
Depends what tire you're using, but when I was talking to someone about MCS, he recommended 650/750 for street/track
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Old Sat, Dec-01-2018, 12:53:18 PM   #3
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Default Re: Spring rates for track car

Muhli:

I have JRZ 2-way adjustable shocks (non-coil over) and am running Eibach 2.25" inside diameter springs:

Front: 700 lbs Length: 6"
Rear: 750 lbs Length 5"

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Old Sat, Dec-01-2018, 05:21:28 PM   #4
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Default Re: Spring rates for track car

MCS 3-way with 900 front and 450 plus helper spring rear (true coilover).

--Peter
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Old Sat, Dec-01-2018, 09:24:56 PM   #5
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Default Re: Spring rates for track car

Was recently having this discussion with a few other trackers. There are a lot of factors that go into it (car weight, aero, tire selection, main tracks) But in general I really don't see the point in springs in the 900-1000# range. Even with splitter/diffuser/wing the underbody aero is not effective so controlling the ride height is not all that important. So the goal should be a set of springs that provides the most grip in the slower speed corners while still having decent support at high speeds.

Ive run 600-700 on Pirelli slicks for the past year and have quite liked that range. With aero I think another 100-150 higher front and rear makes sense. Much higher the car will be giving up too much low speed mechanical grip.
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Old Sat, Dec-01-2018, 10:13:01 PM   #6
herrubermensch
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Default Re: Spring rates for track car

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Originally Posted by Apex_3472 View Post
Was recently having this discussion with a few other trackers. There are a lot of factors that go into it (car weight, aero, tire selection, main tracks) But in general I really don't see the point in springs in the 900-1000# range. Even with splitter/diffuser/wing the underbody aero is not effective so controlling the ride height is not all that important. So the goal should be a set of springs that provides the most grip in the slower speed corners while still having decent support at high speeds.

Ive run 600-700 on Pirelli slicks for the past year and have quite liked that range. With aero I think another 100-150 higher front and rear makes sense. Much higher the car will be giving up too much low speed mechanical grip.
All I can say is that James Clay at Bimmerworld, to whom I accord enormous respect on these matters, will disagree. And most of the successful NASA racers I know with E46 M3s in ST3 and GTS3/4 run at least 900 front.

--Peter
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Old Sat, Dec-01-2018, 10:16:12 PM   #7
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Default Re: Spring rates for track car

Nitron R1s with 900 front 450 rear (True coilover). Car is full weight and Nitron recommended these spring rates. That said, i personally don't have a lot of experience with sizing these things, hence why i went with their recommendation.
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Old Sun, Dec-02-2018, 12:50:50 AM   #8
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Default Re: Spring rates for track car

I am pretty happy with 700F/800R on MCS 2-Way NR.
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Old Sun, Dec-02-2018, 04:08:41 AM   #9
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Default Re: Spring rates for track car

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Originally Posted by ThunderMoose View Post
I am pretty happy with 700F/800R on MCS 2-Way NR.


Denis’ car is where I confirmed my thoughts. His car has full aero/Hoosier slicks and not once did I get the feeling it was undersprung. It was extremely planted through the uphill esses at VIR, which is one of the first spots you’d feel if the car was too soft as the transitions would be sloppy and lazy.


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Old Sun, Dec-02-2018, 04:32:55 AM   #10
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Default Re: Spring rates for track car

I have 600fr/700rr on a 2700lb car with no aero, OE front sway and no rear sway. It was a lot better when the car was at 3000lbs.

Called TC Kline, they recommended 500/600.
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Discussing Spring rates for track car in the M3 Track: Racing and DE Forum - Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)