4350 replies to this topic

[jamiewillson]

Why have you got your pagid blues on the back calipers then?

[Mike (Cliffie)]

Huh, that is what I thought was right. Well pointed our, cheers Jamie.

[Scuffers]

Blue front please! (black rear)

[fezzasus]

The black (RS14 I assume?) are much more aggressive pads, surely in combination with the 4 pots that will move the brake bias massively to the rear?

[techieboy]

Exactly. About time the rear's put some braking effort in.

[VIX]

Problems of brake balance (front bias) discussed here way back in 2004 : http://www.vx220.org...e-distribution/

[ArticMonkey]

Can you not use the AP bias valve to your advantaged with this car? It adjusts the amount of fluid is sent to the callipers I believe.

[alanoo]

It only limits the pressure, does not add some + it's a bit more difficult on the VX brake circuit as due to the ABS, the 4 corners and brake hoses are independent which is different to the non ABS Elise with its two Y derivation blocks for front and rear. (Although it can be easily fixed if you remove the ABS unit)

[Scuffers]

blimey there are some interesting comments on here! in general, yes, for a track car you need the rears to do more. now, we have changed all the callipers, and in the process (with piston sizes) moved the balance a lot rearward, as well as fitting a bias valve, but as had been said a bias valve can only 'limit' the rear, not improve it. back to the pads, the reason for going with the mix is this, the initial bite characteristics are different, (as well as the coefficient of friction, but that's not why I am going this way).

[Mike (Cliffie)]

scuffers knows what he is doing, the bias valve was always planned as part of the job and the front ans rear callipers have different sized pistons.

[alanoo]

I know he does

[GeorgeBC]

Do you know when the sticker packs get released Mike? Don't know what space we have on the car until we know.

[The Batman]

Usually just before first race

[SteveA]

I thought the rear caliper had a handbrake in it.

[FLD]

Random thought (might be pish): If you knock up a bias box (which is fairly easy) could you use the two lines from this into the abs block and still get decent bias adjustment? These would just replace the two lines from the OE MC so it might work and give you good adjustment. Alternatively you'd have to bin off the abs and I'm not sure of the implications of doing this.

[fezzasus]

Random thought (might be pish): If you knock up a bias box (which is fairly easy) could you use the two lines from this into the abs block and still get decent bias adjustment? These would just replace the two lines from the OE MC so it might work and give you good adjustment. Alternatively you'd have to bin off the abs and I'm not sure of the implications of doing this.

I think there's a few people who bin their S2 Exige ABS units and replace with dual master cylinders and a bias bar. Only implication is road legality

[rob999]

I need to find one of these people...

[SteveA]

[Mike (Cliffie)]

Plan is to keep the abs, with an off switch and run the bias valve to the rear.

[Scuffers]

Random thought (might be pish): If you knock up a bias box (which is fairly easy) could you use the two lines from this into the abs block and still get decent bias adjustment? These would just replace the two lines from the OE MC so it might work and give you good adjustment. Alternatively you'd have to bin off the abs and I'm not sure of the implications of doing this.

your over-thinking this....

MC to ABS is only 1 pipe per cct (front/rear), if you want to fit a bias valve, you have to do it BEFORE the ABS unit - otherwise it (the ABS) will not understand what's going on as you have just detached it from the wheel calliper and thus it does not know what pressure the line is at.

In this case, I don't know how well the ABS is going to cope with the change of callipers as well as the change in tyres sizes (from what it was configured for), the std tyres are only 1.6% different, the Kuhmos are some 9% different, so I suspect not well!