Last week I installed a new set of Protech 400 (single valve) in my car. Springs are 300lbs at the front and 175lbs. at the back.
Yesterday I tested it in a circuit and the tail is, although predictable, very happy. I can't apply power until the car is completely straight.
In tight turns in 2nd I get lots of wheel spin with some nice spins 
Now, I plan going to 350lbs at the front, that seems the easier but I can go the ARB route with I like to reduce roll.
What should I do?
Many thanks!
cheers
That's a huge question 
I think we would need to know a whole lot more about your set up before we could answer that.
just for starters:
It could just be tyres or tyre pressures causing this. Suspension geometry, or even too much power 
do you have a limited slip diff?
what sort of car?
A front anti-roll bar is fairly easy to make up, if you go this way the arb needs to be fairly soft by road car standards, try 13mm dia for
starters.
On the other hand springs are fairly cheap but you might have to try a few sets.
Interested in the answer to this as I'm in a similar boat (car). Mine rolls a lot on 450/300 lb springs front/rear - the result is a slightly
wallowy-feeling car and I suspect an ARB would improve this. I've tried going stiffer on springs but found that the car starts to lose grip more
than it improves roll behaviour. Handling otherwise seems OK though.
Ride height could be a factor, if you can lower it you'll get less roll. Has the car been properly set up (and shocks adjusted properly)?
Pictures of your car mid-corner might help us get an idea of how much its rolling.
[Edited on 10/11/14 by rodgling]
Does the geometry of the suspension allow you to put preload on the front springs? ie zero droop. If so, try putting about 100 lb preload per side ie 1/3"up. on the spring platforms on the front.
quote:
Originally posted by rodgling
Interested in the answer to this as I'm in a similar boat (car). Mine rolls a lot on 450/300 lb springs front/rear - the result is a slightly wallowy-feeling car and I suspect an ARB would improve this. I've tried going stiffer on springs but found that the car starts to lose grip more than it improves roll behaviour. Handling otherwise seems OK though.
Ride height could be a factor, if you can lower it you'll get less roll. Has the car been properly set up (and shocks adjusted properly)?
Pictures of your car mid-corner might help us get an idea of how much its rolling.
[Edited on 10/11/14 by rodgling]
I would add to the confusion - Rear dampers too short.
Sound like it is unloading the inside rear wheel.
I also vote for a front ARB. Try 22mm O/D 3mm wall tube and flat levers
Depending on lever length and drop link position, it's worth about 160 Lb of weight transfer
and a similar amount of roll resistance as the 300 lb springs.
This could cut the roll by 1 deg and retain more weight on the inside rear.
Hi. You dont add an anti rollbar in to the equation untill the handling is already sorted. That's the big mistake most make.
Yo do not use an anti rollbar to stop the car rolling you use it to fine tune the weight transfer.
The one very basic question is what is the valving ratio on the dampers being used ?. If you don't know the answer to that your just guessing.
99% of dampers supplied by manufacturers have basic saloon car valving IE far too stiff in compression and no where near enough rebound to control the
very basic problem that is being discussed.
Adding a front ARB to cure the problem at the rear is a backwards step.
Cheers Matt
quote:
Originally posted by procomp
Hi. You dont add an anti rollbar in to the equation untill the handling is already sorted. That's the big mistake most make.
Yo do not use an anti rollbar to stop the car rolling you use it to fine tune the weight transfer.
The one very basic question is what is the valving ratio on the dampers being used ?. If you don't know the answer to that your just guessing. 99% of dampers supplied by manufacturers have basic saloon car valving IE far too stiff in compression and no where near enough rebound to control the very basic problem that is being discussed.
Adding a front ARB to cure the problem at the rear is a backwards step.
Cheers Matt
And a picture of the car!
