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Imho if you are making bells then use the same disc size as the boxter, thats what the calipers where designed for and porsche don't get it badly wrong most of the time.
Ragusa Coupe gone!
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S2 has a different balance to a Porsche so the consideration for disk size means a different solution is ideal unless you start playing around with brake balance in other ways (playing with the pressures or pad selection).
Handbrake off the Ultima are made by Brembo and are suitable for a maximum disk thickness of 28mm. I have a source for these calipers and they are not too expensive. The same caliper is used on various supercars including the Ferarri Modena 360. It is big but it is the best option caliper for a separate handbrake on the rear setup. Your brackets need to be quite large too to mount 2 calipers.
1995 S2 Avant with some upgrades
Designun Limited....
Aerospace, Space and Motorsport Design Consultancy and hardware supply.
still looking at the bias valve option,
could this be mounted in the pipe lines going to the rear just after the abs unit,
or would the distance away from the caliper have to be the same
still reading up about this - any experiance/advice welcome
i am machining the brks to suit so no need to worry bout them just need prices for the caliper as it may be cheaper to buy than try and fabricate a set
still looking at the bias valve option,
could this be mounted in the pipe lines going to the rear just after the abs unit,
or would the distance away from the caliper have to be the same
still reading up about this - any experiance/advice welcome
cheers
will
HI,
I don't know if the S2 is the same as the coupe, but the brake bias is right on the end of the master cylinder. You can replace it there with an adjustable one. Tilton makes a lever type, but I think the dial type from Wilwood is better.
Turn off you ABS, and go out to a large parking lot. Have someone else there to watch your tires. You adjust the rear bias until the rear brakes lock up before the fronts. Then you back it off. You want it so all the brakes lock up at the same time.
Greg
They can have my car when they pry my cold dead fingers from the steering wheel.
Just remember that fuel load has an effect on brake bias. Try your bias adjustments with both a full fuel load & then at about 1/4 tank level. I like the Wildwood bias valve better too. How about cockpit adjustable?
Chris
Just remember that fuel load has an effect on brake bias. Try your bias adjustments with both a full fuel load & then at about 1/4 tank level. I like the Wildwood bias valve better too. How about cockpit adjustable?
Chris
Cockpit adjustable brake balance is right way to crash on the race track. Unless you are professional rally or track driver.
Sau
200 20vt 88' 3b, human carrier
CQ typ85 with AAN inside, see project blog at http://kwlw.blogspot.com
HI,
I don't know if the S2 is the same as the coupe, but the brake bias is right on the end of the master cylinder. You can replace it there with an adjustable one. Tilton makes a lever type, but I think the dial type from Wilwood is better.
Turn off you ABS, and go out to a large parking lot. Have someone else there to watch your tires. You adjust the rear bias until the rear brakes lock up before the fronts. Then you back it off. You want it so all the brakes lock up at the same time.
Greg
mines not an s2, 90 CQ with 3B engine, so it will be the same, anyone want to post a picture with an arrow then i know exactly what im looking at
Cockpit adjustable brake balance is right way to crash on the race track. Unless you are professional rally or track driver.
Sau
if it aint broke dont fix it! if its set, it can stay set,
could it be done on a rolling road? i took a waggon for an MOT, to test the braking capability they run two rollers under the wheels, get you to stand on the brakes and they measure how much torque is required to drive the rollers while you are braking- anyone know of anywhere that does this for 4wheels?
Yes... to a point. Remember that braking forces are also influenced by the friction coefficient between the tire & the road surface. As far as a cockipt adjustable brake bias goes, this will allow you to compensate for the foward/rear weight bias differentiation that will occur during on track racing conditions. As fuel is burned off the front end will become heavier compared to the rear of the vehicle. KWLW is correct, you better know what you are doing.
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Try your bias adjustments with both a full fuel load & then at about 1/4 tank level. I like the Wildwood bias valve better too. How about cockpit adjustable? 
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