Question for Claudius
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Evolving Member
Joined: Dec 2002
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Question for Claudius
Hi Claudius,
You have mentioned that more rear brake bias can be achieved in the Evo VI by draining the proportioning valve. Is this true on our Evo VIII? How exactly is it done?
Cheers,
You have mentioned that more rear brake bias can be achieved in the Evo VI by draining the proportioning valve. Is this true on our Evo VIII? How exactly is it done?
Cheers,
Evolving Member
Joined: Dec 2002
Posts: 171
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From: Frederick, MD
Me no likey sudden spinouts when brakes lockup in rain...
Just curious why you're wanting more rear bias? Do you feel the rears might actually have more stopping power to contribute? My Talon has a bit too much rear bias now and it's damn frightening for me to drive it in the rain.
Thomas Dorris
Just curious why you're wanting more rear bias? Do you feel the rears might actually have more stopping power to contribute? My Talon has a bit too much rear bias now and it's damn frightening for me to drive it in the rain.
Thomas Dorris
Evolving Member
Joined: Dec 2002
Posts: 171
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From: Frederick, MD
Gotcha. That's the same type of thing I was trying with the Talon by swapping to a different bias valve. The '95 turbo AWD Talon came with two different types of rear rotors. The vented rear rotors were made for all of two months, I think, and the bias valve for that had slightly less rear bias than all the other '95 Talons that had non-vented rear rotors. I have the vented rotors on my car, but installed the non-vented bias valve to get a little more rear bias to see if I could keep the fronts a little cooler.
Just that little difference in bias, though, has made the car an unpredictable nightmare in anything but the clearest, driest of days at the track. My last trip to Summit Point resulted in a rather scary spin out at 80-90 mph that I'd rather not repeat anytime soon. Must... locate... proper... bias.... valve. FWIW, that particular bias valve is back ordered from Japan never to be produced again as far as I can tell. :-( Perhaps I need to switch to the non-vented rotors instead.
Anyway, I'm sure you're plenty aware of all this having raced for so long. Just throwing it out for others to consider... Changing the factory bias can be a tricky undertaking.
Bill, have you considered an adjustable bias valve? I guess you're just looking to do a quick test to see what helps and what doesn't.
Thomas Dorris
Just that little difference in bias, though, has made the car an unpredictable nightmare in anything but the clearest, driest of days at the track. My last trip to Summit Point resulted in a rather scary spin out at 80-90 mph that I'd rather not repeat anytime soon. Must... locate... proper... bias.... valve. FWIW, that particular bias valve is back ordered from Japan never to be produced again as far as I can tell. :-( Perhaps I need to switch to the non-vented rotors instead.
Anyway, I'm sure you're plenty aware of all this having raced for so long. Just throwing it out for others to consider... Changing the factory bias can be a tricky undertaking.
Bill, have you considered an adjustable bias valve? I guess you're just looking to do a quick test to see what helps and what doesn't.
Thomas Dorris
Thread Starter
Evolving Member
Joined: Dec 2002
Posts: 447
Likes: 1
I can't run a bias valve in T2, but what I thought Claudius was talking about was draining fluid from an existing part of the stock brake system for more rear bias. Just looking for an easy answer before trying to figure it out the hard way.
Cheers,
Cheers,
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Hi wtz 
When I got my car seam welded, roll caged, stroker installed etc., they did a lot of "minor" mods to the car which they do to GrN cars. One of them is the mod of the brake proportioning device which I mentioned before. I have not seen this, but I was told there are springs and a small plate in it, giving little rear brake bias and causing early front brake lockup, which I can confirm happened on my car before, especially with Pagid RS14 brake pads.
They basically "emptied" the brake proportioning device of its contents, throwing the springs and plate out. That's at least how I remember it; I will call the rally team who did the work and have them explain it to me. They'll be able to tell me if that's the same on the 7 (and thus 8 I would guess (CT9A), you'll have to check). I'll let you know
When I got my car seam welded, roll caged, stroker installed etc., they did a lot of "minor" mods to the car which they do to GrN cars. One of them is the mod of the brake proportioning device which I mentioned before. I have not seen this, but I was told there are springs and a small plate in it, giving little rear brake bias and causing early front brake lockup, which I can confirm happened on my car before, especially with Pagid RS14 brake pads.
They basically "emptied" the brake proportioning device of its contents, throwing the springs and plate out. That's at least how I remember it; I will call the rally team who did the work and have them explain it to me. They'll be able to tell me if that's the same on the 7 (and thus 8 I would guess (CT9A), you'll have to check). I'll let you know
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