10 replies to this topic

[Kieran McC]

What is the best number of clicks to set Nitron NTR 40s at for track and road use ?

[FLD]

Surely the damping rates is dependant on the springs you have, the corner weights of your car etc.  Simply saying X-clicks would be talking pish.

[CocoPops]

saying X-clicks would be talking pish.

[Dave E]

Agree with the above but for reference with 450/550 springs I start with 6 clicks from hard front and rear, then adjust to get the required balance. If it's understeering I'll go softer on the front, oversteering then go softer on rear. I find going any harder on the front can make it skip under braking.

[Dave E]

Oh and road settings I usually go 14/12, from hard again.

[P11 COV]

What is the best number of clicks to set Nitron NTR 40s at for track and road use ?

You don't mean what number for track and road do you? Surely you mean how many for track and how many for road? Anyway as others have said it all depends...

[Kieran McC]

My spring rates are 350 front and 450 rear  Only just had these fitted looking at what is the best stating point ,Ride height 125 rear ,115 front

[PaulCP]

As stated it depends on other factors but mine were usually set at -15 road and <> 6-8 track with minor adjustments as described by Dave above

[CocoPops]

Most importantly... How does it feel to YOU Kieron?

[Kieran McC]

Most importantly... How does it feel to YOU Kieron?

 

It will be nice to find out when the car is running wright LOL  

[alexb]

That's the beauty of suspension setup, very hard to say what's right and what's wrong. I tried my very best to find some facts, but ended up with guidelines, all with a remark that these provide a starting point but from there you can go in any direction.

 

Guidelines:

- start with ride frequency, which determines spring rate. Track use you want a higher ride frequency than road use. So you go for a compromise. You're spring are in the compromise area. Track use you go higher rate, pure road lower

- ride frequency at the front should be about 10% lower than at the back to avoid pitch due to resonance. This is where things already go terribly wrong, as even for the standard springs this is not true. Everybody seems to go for about the same ratio as for the standard springs, so say rear 15-20% higher than front. I've no idea why Lotus did this however, so assuming that for higher spring rates you should use the same ratio is tricky. As everybody is seems to do this, very little evidence for the contrary

- next thing is roll stiffness, which is where ARB's come in

- distribution of roll stiffness front and rear

- damping ratio for single bump (compression damping)

- damping ratio for rebound

(this is the short version)

 

Your question is about the last two. In case you have one ways, the ratio between compression and rebound damping is fixed. Probably around 3 times as much rebound damping as compression damping. Don't know what the ratio is that you can select with the NTR's, I've never seen it published for any shock.

 

So in short: 6 from hard for track, 12 from hard for road (just kidding!! right answer is above: whatever feels good for you. Start full soft and go from there is the practice that is most used. You will need to do some 'testing'. You're lucky to have one-ways: only 24 settings. Three ways take a little more time )

 

(I've asked Nitron to send me the speed-force diagrams for my shocks that are being refurbished and they promised to send me some. So at some stage I might get a clue about what the setting are. Not that it helps in any sense, but I can do cool calculations if I have the data)