AdiSRI
Member
Registered: 1st May 02
Location: Berkshire
User status: Offline
|
My current ones on my FK highsports are
FK1865 Main Spring Length 180mm Inner Diameter 61mm 50N/mm
i find it too soft for my liking and get a bit more bodyroll than id like now i have removed the front arb. My dilemma is which set of replacement springs to get, there are 3 that interest me..
FK1767 Main Spring Length 170mm Inner Diameter 61mm 70N/mm
FK1768 Main Spring Length 170mm Inner Diameter 61mm 80N/mm
FK1769 Main Spring Length 170mm Inner Diameter 61mm 90N/mm
anyone have any insight as to which might be best?
|
TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
|
What engine you running again? You dont HAVE to stick with FK springs - there are many more manufacturer's of 2.25" coilover springs that are prob a bit cheaper than FK. Ive found 300lb best for 20XE - not sure what that equates to in N/mm though.
|
Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
|
I think 300 lbft is roughly equivalent to 40 N/mm... seems quite a soft spring setting.
Adi, go for the FK1767's.
|
AdiSRI
Member
Registered: 1st May 02
Location: Berkshire
User status: Offline
|
i have the X14XE engine, but plan to fit a C20LET at some point...
i find the current ones60N/mm to be pretty soft, and i wonder if the 70N/mm ones will be enough stiffer...
|
A2H GO
Member
Registered: 14th Sep 04
Location: Stoke
User status: Offline
|
i have da same problem, i find the back 2 b alot harder that the front, i have alot of clearance between the arch and wheel at the front but it scrapes lyk mad on 16's on corners due 2 the body roll.
|
TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
|
right 300lb is 52.63n/mm and believe me they AINT soft! Spax fit 256lb springs to all of there RSX nova/Corsa coilovers and AVO fit something in the region of 260lb.
with 300lb springs you get a firm ride, I know from experience as ive tried a few different poundages on my coilovers.
Deffo want something in the region of 300-330lb for the 20XE and 350lb+ for the LET with F28 in a Corsa. If you dont believe me ask a few motorsports people - PROTEC for one are Corsa Rally specialists and ask them what they recomend for fast street use. Also just look at the spec on some top cars - Martin Reyland had 485lb upfront on his Escort and 180lb on the rear and that was a true track car.
Another big thing you have to think about is if the dampers are upto the job of higher poundage springs. My guess is that the FK's will be valved for a fairly soft setting, fit too harder spring and you'll get bounce and twitch as the dampers cannot keep up controlling such a hard spring.
I just dont understand how you can get such roll from a 50N/mm springs which you are currently running - these equate to about 280lb ish. How low are they set? How confident are you that the FK springs are indeed 50N/mm, and what they are telling you is correct? I'd go with a set of 325lb ers if I were you. What meet are you next at? - take a drive in my car and see if you like.
|
A2H GO
Member
Registered: 14th Sep 04
Location: Stoke
User status: Offline
|
I kno ur replying 2 Adi but, mine r set with about 2cm of thread under the rings, and u can feel wen u go over speed bumps, the front is soft and drops loads and the back is rock hard. was considering a whiteline anti roll bar 2 reduce body roll thus keepin the arches further away from the tyres on roundabouts etc.
|
TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
|
Dont understand what your saying about how low yours are - just how much lower than std are yours - approx 30mm/40mm/60mm? What your describing is suspension travel no? - i.e doing its job. The back will probably be bottoming out onto the bumpstops hence rock hard? So it rolls round corners badly then, lowering further will reduce this as it will mean that the car just sits on the outside bumpstop on corners but thats not ideal for good handling, especially in bumpy wet corners.
My guess is that FK have there facts wrong and they are supplying you with lower poundage springs than they say, can you push the front corners of the car down with you hands - mine barely moves!...
I'll try and post a pic to show just how thick the coils are on my Harry Hockley coilovers...
[Edited on 09-02-2005 by TOMAS]
|
A2H GO
Member
Registered: 14th Sep 04
Location: Stoke
User status: Offline
|
Its probally lowered 60mm ish on 16's and theres about 1cm between the wheel and arch. my m8s is on gmax springs and shocks -60mm and the arch sits closer 2 the tyre and dusnt rub round corners. my rear suspension is the fk springs that came with the coilovers with the adjuster cups taken off, hence jus the springs lyk a normal suspension kit, will get a pic of my suspension wen i get it bk from the bodyshop on satD.
its only running a 1.4 16v so there isnt that much weight up front.
so i dnt kno???
have u2u'd Fear as he is runnin the same wheels and suspension and his sits way lower than mine at the front.
|
AdiSRI
Member
Registered: 1st May 02
Location: Berkshire
User status: Offline
|
the springs on the car are 1865's which are 50N/mm its stamped on them.
They are soft, my old apex -40mm kit was far stiffer, there is noticable bodyroll at the front, and as with corsash it rubs when u corner at speed.
mine are set like this...
any advice then, i guess going harder than the 70N/mm ones would be silly?
|
AdiSRI
Member
Registered: 1st May 02
Location: Berkshire
User status: Offline
|
quote:
Originally posted by CorsAsh-Sport
Its probally lowered 60mm ish on 16's and theres about 1cm between the wheel and arch. my m8s is on gmax springs and shocks -60mm and the arch sits closer 2 the tyre and dusnt rub round corners. my rear suspension is the fk springs that came with the coilovers with the adjuster cups taken off, hence jus the springs lyk a normal suspension kit, will get a pic of my suspension wen i get it bk from the bodyshop on satD.
thats gonna be very low at the back, at least an inch lower than mine so no wonder it rubs!!
its only running a 1.4 16v so there isnt that much weight up front.
so i dnt kno???
have u2u'd Fear as he is runnin the same wheels and suspension and his sits way lower than mine at the front.
Fear has konigsports with adjustible damping, so he can stiffen them right up...
|
AdiSRI
Member
Registered: 1st May 02
Location: Berkshire
User status: Offline
|
anyone!!!
|
TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
|
Adi if your fitting a LET with F28 then just go out and get yourself some 350lb 10" springs, they DONT have to be FK, Tweeks do Faulkner, Avo etc...
With 350lb and your current engine you'll loose your fillings but your convinced you've got bad bodyroll on the bends and if your currently running 280lb springs then a 70lb increase will be plenty.
As for your scrubbing, a higher poundage springs should reduce how easy it is for the strut to compress so therefore should reduce scrub but the only sure way your gonna get rid of scrubbing is fit smaller wheels/narrower wheels or bigger bumpstops.
What sort of answer are you looking for?
I can only tell you what works for me with 20XE and my experiences with my Corsa after 4 years, 65,000 miles and approx 5 diffo suspension kits - as well as mixing and matching those 5 kits.
Ive ran...
G Max kit
Avo kit
Spax PSX kit
Spax RSX kit
Harry Hockley Grp A Tarmac/Bilstein
Adi, have a look on MIG web, the subject of spring poundages with 2.0 16V Nova's/Corsa's is quite talked about...
|
Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
|
just on this subject does anyone else notice when they change something on there suspension to cure under steer it works great..... for a week then the under steer is back?
i have a right pain in my arse battling with understeer again.... changed stuff around last week the car was amazing.. couldnt get it to slide... this week understeer.. yay!!
[Edited on 11-02-2005 by Siberia]
|
TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
|
Could it be the weather perhaps?
|
Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
|
quote:
Originally posted by TOMAS
Could it be the weather perhaps?
i was putting it down to this last week cos it was raining and the roads were slippery... but yesterday it was bone dry and the car didnt feel too good in the bends...
|
AdiSRI
Member
Registered: 1st May 02
Location: Berkshire
User status: Offline
|
yeah its due to the greasy roads atm, mines sliding again aswell.
Mainly i would like to know the dangers of using springs that are too harsh, ob there will be less grip and i dontr want to buy springs that are soo stiff they make the car dangerous for everyday all weather driving.
So does that mean u think the 70N/mm ones will be plenty stiffer than my current ones and should do the job.
|
TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
|
Put it like this... Back in the day due to my seriously poor knowledge of suspension I drove around for the best part of a year on a set of bottomed-out shocks (I was sitting on bumpstops) it was awfull and handled really really bad - If I caould do that then believe there will be nothing wrong with 350lb springs on a LET.
You WILL find them hard with your current engine but they wont be bang bang hard like bottoming out, just very firm. I'd go for it so long as youve deffo got the LET in the pipeline otherwise 350 is too hard IMO.
Dont go for FK springs, go for Faulkners at Demon Tweeks - they are what im running, and you'll have to calculate what length you need as a 350lb spring WONT compress as much as a 280lb so you'll have to wind the bottom spring seats further down, might be worth going for a 1" shorter spring than you currently have or even shorther, which will mean then you have to wind the bottom seat up the leg therefore giving you extra tyre clearance which is a bonus.
|
AdiSRI
Member
Registered: 1st May 02
Location: Berkshire
User status: Offline
|
ok i think ill get the 70's and see how they are.
thanks again.
|
