Springs 400 front 325 rear
Discussion
After a disappointing experience driving fully loaded up to Wales in the Chimaera, I am thinking about upping the spring rates on my Nitrons from 325/250 to 400/325.
I know there are many people running much higher rates but this car has to be a bit of an all rounder so it has to be good for road, track and road trips (LM, 'ring).
I know there are many people running much higher rates but this car has to be a bit of an all rounder so it has to be good for road, track and road trips (LM, 'ring).
RedCabbage said:
Nitron claim standard valving will cope with four rate increases (25lb each) so I should be well within that. Joolz will probably be doing the set up anyway so I'll speak to him as well.
Have a chat to him about my set RC i have no doubt Joo will sort it to your satisfaction fella 
Im running 375 F / 325 R with Protech's from Jools. I reset the damper adjustment range to give stiffer settings and the result is really excellent. Mine is mainly a road car but also do sprints and trackdays and actually I feel its a bit on the soft side now so I might consider a set of stiffer springs.
Uncle Fester said:
I have 400/325 with Nitrons. I gave Nitrons the data and this is what they suggested. It can crash a bit over potholed surfaces but the handling is very good.
They were supplied and the car set up by Ab Shocks. I wouldn't want to go softer, but would like to try a bit harder.
I agree regarding the pot hole comment Fester and i have 450 front 375 rear which has transformed the car They were supplied and the car set up by Ab Shocks. I wouldn't want to go softer, but would like to try a bit harder.
Can I ask those with up to 450 front and 375 rears, are you running standard profile tyres ??
Lots of Phers seem to be running 17 or 18 rims with 35/40 profile tyres.
If upping the spring rate and lowering the tyre profile, how do you keep your fillings in ??
Out of interest I have Poly bushes, Avos with 275/250 following Jools recommendation for general running. Soft and pilabile for touring with 6/8 clicks.
I also do Sprinting and Hill Climbs (plus a Track day or 2) and the flexibility offerred by 10/12 clicks on the Avos and standard 55 profile front & 50 rears means I'm never too far off the pace - there's never many other TVRs to compare !! I would think the Std Goodyear F1s are the achilles heel, not spring rates ??
Trev Mac
Lots of Phers seem to be running 17 or 18 rims with 35/40 profile tyres.
If upping the spring rate and lowering the tyre profile, how do you keep your fillings in ??
Out of interest I have Poly bushes, Avos with 275/250 following Jools recommendation for general running. Soft and pilabile for touring with 6/8 clicks.
I also do Sprinting and Hill Climbs (plus a Track day or 2) and the flexibility offerred by 10/12 clicks on the Avos and standard 55 profile front & 50 rears means I'm never too far off the pace - there's never many other TVRs to compare !! I would think the Std Goodyear F1s are the achilles heel, not spring rates ??
Trev Mac
Uncle Fester said:
spend said:
That is what they are doing Stupid! The ratio is raised in favour of the rear...
One end more than the other. Not +75 front and rear like me, or +125 front and rear like Pasco.
As in +75 front, +100 rear, or any similar combination.
K4TRV said:
Can I ask those with up to 450 front and 375 rears, are you running standard profile tyres ??
Lots of Phers seem to be running 17 or 18 rims with 35/40 profile tyres.
If upping the spring rate and lowering the tyre profile, how do you keep your fillings in ??
Trev Mac
Well i'm not running rates that stiff, as i said above (375 / 325) but again as stated I would certainly consider going significantly stiffer. I am running 17 / 18 inch rims with 40 profiles and find the set up very comfortable for road use, but then I like the car to be fairly taught and I drive it hard. Obviously personal preference, perception is going to be a major factor and what one person thinks is comfortable / soft someone else will feel is rock hard. Lots of Phers seem to be running 17 or 18 rims with 35/40 profile tyres.
If upping the spring rate and lowering the tyre profile, how do you keep your fillings in ??
Trev Mac
As far as changing the RELATIVE stiffness between front and rear, all other things being equal this will determine the basic handling balance of the car.
Stiffening the front relative to the rear will favour understeer and stiffening the rear relative to the front will move the balance towards oversteer, due to greater load sharing between the tyres on the softer axle (i.e the softer end of the car will grip more than the stiffer end).
Of course increasing stiffness overall will tend to increase grip (on smooth surfaces anyway) partly by reducing roll and the associated loss of tyre contact patch - which any roll induced increase in negative camber can only offset so far.
Pasco said:
steve-V8s said:
One of the reasons I went up 75 at both ends is you only need to buy two springs, at least that is the case with Nitrons. Put the front springs on the rear and the new ones on the front.
This is a man with a Brain 
Dave
spend said:
Pasco said:
steve-V8s said:
One of the reasons I went up 75 at both ends is you only need to buy two springs, at least that is the case with Nitrons. Put the front springs on the rear and the new ones on the front.
This is a man with a Brain Dave
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