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YOUR RESEARCHCoilover spring rate.
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That's my setup, but with Ohlins, and it's what Chris recommended based on mine being a road car.
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In addition to the standard Ohlins there were a couple of cars running the Ohlins with custom spec'd softer springs.
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Mine feels good and I also have the PSS9 set quite soft.
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Others in the test (I'll leave it to them to chime in with their thoughts) had their Ohlins equipped with softer springs as follows.
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My coilovers are 8kg rear and 6kg front according to the supplier. I'm going to get the spring size and try 7kg and 5kg. There are 30 damping settings but obviously spring rate never alters, it feels a bit oversprung. Has anyone altered the springs on coilovers, or has any experience with different spring rates? Cheers.
The 911 & Porsche World issue 310 article about various 996 suspension setups is well worth a read. Many different setups with different spring rates stated along with thoughts on each setup from the guys at Centre Gravity.
Well worth a read, especially from the point of view of the effects of different spring rates.
I think Maldren and Mister Corn (And probably others here) were involved on the day and may have thoughts to add?
Indeed it would. I'm keen to read the feature and get a starting point most dampers have a lot of adjustment but spring rates always seem on the hard end of the scale which is ok on a flat road but elsewhere can be a bit bouncy
I recently went from the 800lb/in rear springs that came with my second hand H&R coilovers to the MO30 rear springs. I had to have the bottom coils heated and opened up so they would fit the coilovers. I now no longer have a sore back after driving on bumpy B roads.
From everything I've read of other people's experiences, the springs that are supplied with coilover kits tend to be grossly over-stiff. I think 250/500 front/rear are the sensible limit for a road car.
Just by way of reference and taking data from the article:
Standard spring rates - 26nm & 53nm
M030 spring fates - 26nm & 53nm (just quoting the article. Sounds a bit unlikely to me that the M030 doesn't have a stiffer spring rate...)
Designtek coilovers - 50nm & 70nm
Bilstein PSS9 - 50nm & 90nm
Ohlins R&T (as supplied) - 60nm & 120nm
Now. In addition to the standard Ohlins there were a couple of cars running the Ohlins with custom spec'd softer springs. As you can see above the standard Ohlins springs are over 100% stiffer than standard. To me my Ohlins equipped car doesn't feel much stiffer than the previous M030 it had but I think that is likely down to the quality of the dampers. Anyway. Others in the test (I'll leave it to them to chime in with their thoughts) had their Ohlins equipped with softer springs as follows.
Ohlins custom springs 1 - 40nm & 90nm
Ohlins custom springs 2 - 40nm & 60nm
I won't go into too much further detail, the article is very good and I think it is fair for 911 & Porsche World to make some money off their efforts so feel free to buy a back issue.
However.
The reviewer Chris Franklin (Of Centre Gravity fame) implied that the 60/120nm standard springs on the Ohlins might be a bit stiff for British roads (Though I love it...) whereas he seemed to prefer the softer sprung versions of the Ohlins, specifically the 40/90nm Ohlins combination which he listed as his favourite.
So. I hope that is helpful. It was interesting that the 'Budget" Designtek coilovers came out sounding pretty good when compared to the likes of Ohlins & Bilstein (For less money). Of course the real benefit of coilovers is the ability to swap out different spring rates to suit your individual requirements.
Maybe some of the others here who were involved in the actual test might chime in with their thoughts (As opposed to me reading a magazine!)
Sorry for the late input....
I started a thread here and the 991 & Porsche World day at Bruntingthorpe because I had been trying to improve the ride on my 996 C2 M030.
I met Dammit and was impressed by the ride of his car and got CG to fit Ohlins R&T setup to my car. There was some discussion about spring rates but their view at the time was that the standard set up was fine and I didn't know that Dammit had softer springs.
I have been very disappointed with the ride on my car but I also saw lots of threads here taking about different spring/damper combinations.
According to 911&PW, the M030 springs are 26Nm/53Nm and the GT3 RS are 43/80. The Ohlins at 60/120 are clearly track biased. I am now about to change to 40/70 and I hope this will give me a good compromise. Of course the dampers are setup for the stiffer springs but by all accounts they adjust well. I'll report back by the end of the month.
I'm currently running 40nm front springs and 90nm rears, I did contact Chris at COG as I bought my PSS9's used. He said the fronts that came with the kit are fine but thought the 150nm were to stiff for the road. Mine feels good and I also have the PSS9 set quite soft. More than happy with this set up.
