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spring rates on jpsc cars with ARB please?
bi22le - 30/12/15 at 08:46 PM

Just wondering what the tried and tested guys are running on their cars.

I know car weight is important so please state this. Competition car info preferred.

I am expecting to be changing my Current 300lb front springs to mid or low 200lbs following some calcs and chats to a few people.

Rears will probably stay the same at 225lb.

i am going to fit caterham S3 ARBs as a starting point. Hopefully nice and soft and from a car of similar weight, 540kg.

mark chandler - 30/12/15 at 09:52 PM

What size springs you running Bizzle, I have some 2 1/4, 225lb 9'" long ones that I would like to swap for some that are around 300lb.

jeffw - 30/12/15 at 10:10 PM

I run 250 fr, 225 rear.


[Edited on 30/12/15 by jeffw]

adithorp - 30/12/15 at 10:28 PM

I'm running 210 front and 180 rear with a front ARB. 550kg

theprisioner - 30/12/15 at 11:13 PM

200ib front 300 rear and arb front and back own design

http://sylvabuild.blogspot.co.uk/2014/11/anti-roll-bars-arb.html

I did not do much calculation but I can tell you it works wonderfully at Kames sprint track 99.6s last MSA timed run. Of course it is a J15.

226/326 550Kg total

[Edited on 30/12/15 by theprisioner]

SPYDER - 31/12/15 at 01:59 PM

When we were building our Phoenix we asked our friend Tim Gray ( Multiple Locost, RGB and Bikesports Champion )
He said to go 250 all round. So we did.

MattD - 31/12/15 at 02:27 PM

Chassis supplied with 180fr / 130 rr, but that was way too soft.

Currently on 225 Fr / 180 Rr with front ARB, live axle rear, which is a good compromise.

Was better on 275 fr /225 rr on track, without the ARB but too stiff for regular road use (my old steel s/a AVO shox prob a factor too).

Stylus, 625 KGs

bi22le - 31/12/15 at 06:54 PM

quote:
Originally posted by mark chandler
What size springs you running Bizzle, I have some 2 1/4, 225lb 9'" long ones that I would like to swap for some that are around 300lb.


I mark. Unfortunately mine are 13.5" long as per procomp shocks. I would probably try and keep my old springs anyway just incase I need to revert back.

I think I have a set of 225 squirrelled away somewhere. These seem to aiming in the right ball park.

strikerbird - 1/1/16 at 07:25 PM

I use 225 front with an arb, 125 rear with a live axle on a striker. It handles well I won class 2A in the service hydraulics championship, so it works for me.

Jim Spencer won about every championship going a few years ago using the same setup.

John Bradshaw also competes in a striker and I'm sure his rears are around the same.

The shocks are protech ones that have been valved to suit the car. My car weighs 490kgs.

Hope this helps