Brake pressure regulator?
Discussion
cheers for the info.
basically i also hillclimb small turbod scimitars and a friend has built a 300hp Sabre turbo and is in the process of fitting discs to the rear (along with monster fronts) and the aftermarket brake supplier has suggested that a brake reg will help reduce the braking under heavy dive. I mentioned that my S2 has just such a device but didnt know which car it was from.
it may never be required, but if we have one to hand, it can be fitted when testing on track and run back to back.
seems to work well stopping the rear of the Tiv from locking up under hard braking
basically i also hillclimb small turbod scimitars and a friend has built a 300hp Sabre turbo and is in the process of fitting discs to the rear (along with monster fronts) and the aftermarket brake supplier has suggested that a brake reg will help reduce the braking under heavy dive. I mentioned that my S2 has just such a device but didnt know which car it was from.
it may never be required, but if we have one to hand, it can be fitted when testing on track and run back to back.
seems to work well stopping the rear of the Tiv from locking up under hard braking
Edited by CNHSS1 on Wednesday 10th November 10:18
you can get generic ones from various motorsport suppliers, try Demon Tweeks or somewhere like that.
Not sure they work in the same way though in terms of inertia, I think it just regulates the pressure (adjustable) going to the rears, which might be a better plan if you're pointing the front end at the sky doing hillclimbs.....
Not sure they work in the same way though in terms of inertia, I think it just regulates the pressure (adjustable) going to the rears, which might be a better plan if you're pointing the front end at the sky doing hillclimbs.....
Some of the aftermarket ones are variable so you can adjust pressures front to back as you require, however there is something I read about these which said if they are to be used on the road then the regulator must be locked off so that it can't be adjusted to be unsafe for road use. Worth checking out. The sierra unit we have must be fitted at an incline for it to work correctly. I don't know if the incline is different from car to car according to weight etc. The sierra item has a bloody big ball bearing in it that rolls up and down to allow for the inertia of the car.
the car has a bias pedal box and the possibility of a bias 'valve' to go in the rear line, but as Tonup says, the Tiv-fitted one uses a ball bearing which actually alters the braking effort under heavy dive, which is more what we think we are going to need. We can set the bias pedal box (2 x m/cyls, 1 x F, 1x R circuit) but that makes as permanent and constant change to braking effort to the given circuit. What the aftermarket peeps sell as a bias valve, is basically a restrictor in the line to the rear brakes, reducing effort over the whole range of pedal movement, which again isnt what we think we are going to need to do.
The car in question is a trackday car mainly (not mine, thats purely hills) but its used most weeks on the road as a daily. when used on the road the shocks are backed off to give a more sesnible ride, but as such the car dives under braking more like any nromal road car. The Tiv-fitted regulators appeal, is that under normal braking, even firm, if the car stays reasonably level, the rear brakes do a reasonable amount of the cars total braking effort. When one 'throws out the anchor' the weight transfer is such that the front tyres and brakes actually do nearer 85-90% of the braking so the rears will lock solid, possibly causing a car/ditch interface moment
. The ability for the regulator to 'back off' the braking effort to the rears in this situation is what we are looking for.
Basically if theres one to hand, its minutes work trackside to whip it off, fit a double ended apdator in its place, re-bleed and try without.
Plan is to make up a bracket same angle as my S2 for starters, and then we can tweak the angle (bend the bracket, how techie!) to fine tune if needs be.
hope that all helps Chaps, now whos got a part number of teh one used on the S2 if theres more than one version? or one kicking around?
The car in question is a trackday car mainly (not mine, thats purely hills) but its used most weeks on the road as a daily. when used on the road the shocks are backed off to give a more sesnible ride, but as such the car dives under braking more like any nromal road car. The Tiv-fitted regulators appeal, is that under normal braking, even firm, if the car stays reasonably level, the rear brakes do a reasonable amount of the cars total braking effort. When one 'throws out the anchor' the weight transfer is such that the front tyres and brakes actually do nearer 85-90% of the braking so the rears will lock solid, possibly causing a car/ditch interface moment
. The ability for the regulator to 'back off' the braking effort to the rears in this situation is what we are looking for. Basically if theres one to hand, its minutes work trackside to whip it off, fit a double ended apdator in its place, re-bleed and try without.
Plan is to make up a bracket same angle as my S2 for starters, and then we can tweak the angle (bend the bracket, how techie!) to fine tune if needs be.
hope that all helps Chaps, now whos got a part number of teh one used on the S2 if theres more than one version? or one kicking around?
Edited by CNHSS1 on Wednesday 10th November 14:46
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