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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


 
 
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Old Sun, Dec-27-2015, 11:02:19 PM   #11
EricSMG
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Default Re: Shock dynos, Fat Cat Motorsports and custom valved Bilstiens

Quote:
Originally Posted by RedM3/4 View Post
Nice write up. After you try the dinans, will you ask FCM to tune to OE or the Dinans?
My dinan springs were about 7.8" shorter at free length, but only about 1/8" shorter ride height after wear in, so my assumption is they have to be stiffer.

ADS
My butt dyno says the Dinan's are only marginally stiffer than stock - most of that in the rear. So, I'll just tune it by feel which, to me, is all that matters. I know exactly how I 'want' the car to feel and so now I get to play the part of race car driver and explain to the tuner (FCM) how the car behaves differently than how I want it to behave. I am learning how to articulate what the dyno shows into how the car feels on the road and how changes in the shape of the dyno will change how it feels. It's fun and challenging at the same time.

Over the next few days I will:

1. Perform the zip tie test to determine the level of interaction of the rear bump stops depending on vehicle speed and road surface.

2. Download an accelerometer app to my phone and measure the up/down movement of the chassis over different surfaces at different speeds.

3. Test the Dinan springs with current valving.

From these, and the butt dyno, Shaikh and I will come up with the revision two settings.

We want maximum comfort and maximum performance = a car that is very easy to drive, fast, over real world roads.

The current setup is very good.

Edit - with Konis + Dinans I saw a solid ~5/8" drop all around. So I'm hoping with the FCM HD's + Dinans to be at around 3/8" to 1/2" drop all around. This could truly be nirvana in this car.
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Last edited by EricSMG; Sun, Dec-27-2015 at 11:06:18 PM.
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Discussing Shock dynos, Fat Cat Motorsports and custom valved Bilstiens in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)