Koni Springs

[driversdomainuk 8]

Hi

 

Would anyone happen to know what the Lb spring rating is on the springs which come with the Koni non coil over adjustable kits..?

 

Also would they be stiff enogh to take 27mm ARB and 25mm TBs - if not what is the ideal LB rating springs up front to work well with this rear end setup..?

 

thanks

[Anthony 1,003]

Can't help with the exact poundage, but I can tell you from my experience that coupled with a standard 309 beam (20mm torsion and anti-roll) the Koni springs produce a fairly balanced, neutral handling car, and with a standard 205 beam (19mm torsion and anti-roll) produce something that understeers slightly on the limit.

 

Thus I'd say with the beam you're talking about, they'd be too soft and the handling balance would definately be on the oversteer side.

[Butler 0]

I have had pretty much the same experience as novelty condom head.

 

I would have thought you'd need anything from 200-400lb springs. I would guess the koni's are about 150-200.

[driversdomainuk 8]

Can't help with the exact poundage, but I can tell you from my experience that coupled with a standard 309 beam (20mm torsion and anti-roll) the Koni springs produce a fairly balanced, neutral handling car, and with a standard 205 beam (19mm torsion and anti-roll) produce something that understeers slightly on the limit.

 

Thus I'd say with the beam you're talking about, they'd be too soft and the handling balance would definately be on the oversteer side.

 

 

Thanks for that Anthony. I don't want the expense of changing both the front springs and dampers then. However, I know you can get custom wound springs to fit non coil overs. I was thinking of around 325lb - would the Koni dambers on hardest settings damp these ok?

 

PS - anyone know the company which does these custom springs for non coil overs..?

[driversdomainuk 8]

Sorry Butler, only read your reply after posting my question!

 

400lb...bet that would be nice on the road LOL - although I would not have to worry about extra rattling as I dont have any interior

 

has anyone tried 500lb springs?

[SimonJ 2]

I have 225lb with 23mm TBs and 24mm ARB and it works well. You're therefore probably looking at around 275lb upwards.

[Butler 0]

I think Phatgti had some koni's revalved for 500lb springs.

 

I "think" James Lumley runs 400lb springs on a tarmac rally car with 23mm bars.

[driversdomainuk 8]

I think Phatgti had some koni's revalved for 500lb springs.

 

I "think" James Lumley runs 400lb springs on a tarmac rally car with 23mm bars.

 

 

So 500LB springs with this setup could be considered..? (also with a Tran-x Diff)

[driversdomainuk 8]

errr - more realistic would 400lb springs work ok with my setup (without revalving the Konis)?

[tom_m 0]

well going by the PTS build manual for bar widths and spring rates the gravel specs are 21mm bars to 185lb springs and tarmac specs are 23mm bars to 225lb springs, so for 25mm bars i'd guess at 265lbs being a good match

[Rippthrough 98]

well going by the PTS build manual for bar widths and spring rates the gravel specs are 21mm bars to 185lb springs and tarmac specs are 23mm bars to 225lb springs, so for 25mm bars i'd guess at 265lbs being a good match

 

 

They're not all that well matched then?

As going by the ratio of the 21mm to 185lbs, then 23 bars would be better with 265lb springs, guess the gravel setup is designed for less oversteer than the tarmac setup.

 

In which case for tarmac and 25mm bars you would need roughly 300lb springs for a similar balance.

[Butler 0]

The stiffness increases exponentially with each mm.

[Rippthrough 98]

The stiffness increases exponentially with each mm.

 

 

to ^4 for fag packet calculations.

Edited November 1, 2006 by Rippthrough

[driversdomainuk 8]

They're not all that well matched then?

As going by the ratio of the 21mm to 185lbs, then 23 bars would be better with 265lb springs, guess the gravel setup is designed for less oversteer than the tarmac setup.

 

In which case for tarmac and 25mm bars you would need roughly 300lb springs for a similar balance.

 

 

So whats the most important rear end mod which governs how stiff the front end needs to be; ARBs or TB's as a few of you have reffered to 25mm or whatever and am not sure which you mean

[Rippthrough 98]

So whats the most important rear end mod which governs how stiff the front end needs to be; ARBs or TB's as a few of you have reffered to 25mm or whatever and am not sure which you mean

 

Torsion bars are the spring rate to set the initial balance with.

 

for example 27mm tb's should be aiming for around 500lb (!) springs.

Edited November 1, 2006 by Rippthrough

[tom_m 0]

So whats the most important rear end mod which governs how stiff the front end needs to be; ARBs or TB's as a few of you have reffered to 25mm or whatever and am not sure which you mean

 

i'm talking about torsion bars, and mention 25mm because thats what you specced in you're original post. as for arb thickness all I know is PTS specced 2mm bigger arb than torsion bars throughout there range, so if it works for them... 27mm arb will work with 25mm arb.

 

general rule of thumb for fwd (as i'm sure you know) is stiff rear and soft front (relative)

Edited November 1, 2006 by tom_m