94 hatch, ITR brakes front and rear, ITR MC & BOOSTER, no ABS, 99/00 Civic SI prop valve, track/street pads front, factory pads rear.

I am trying to prep my car for future HPDE's and right now I have the 94 civic prop valve, witch is fine for the street because I dont drive like and *******, but I have felt the rears lock before the front, and i'm going through my rear pads like they are going out of style. I am hoping that the SI prop valve will fix my bias problem,
what do you think...
Chris

 

It's an HPDE... any setup will work.

Just out of curiosity, when did you feel the rears lock before the front?

 

i have a stock cx prop valve.....with itr front and gsr rears....i am on my second set of pads in 4 years on the rear...and i only chaged the rears cause one of the pads was 1/4 inch thick...

 

Did your car originally have discs or drums in back? If drums, yes change the prop valve. The pressure and flow needed for even small rear discs is way different from what drums need. If it had discs, I would not expect a huge difference from one to another. Have you considered an adjustable one?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mohudsolo &raquo;</TD></TR><TR><TD CLASS="quote">Did your car originally have discs or drums in back? If drums, yes change the prop valve. The pressure and flow needed for even small rear discs is way different from what drums need. If it had discs, I would not expect a huge difference from one to another. Have you considered an adjustable one?</TD></TR></TABLE>

If this is true then how come the 99-00 Civic Si prop valve is an IDENTICAL part number to that of the DX/HX coupe and CX/DX hatch (both with rear drums of course)?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Apocalypse &raquo;</TD></TR><TR><TD CLASS="quote">t's an HPDE... any setup will work.</TD></TR></TABLE>
Sure.. if I only want to use less than half of my braking, coming into turn 1 I might as well just use my e-brake.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Apocalypse &raquo;</TD></TR><TR><TD CLASS="quote">Just out of curiosity, when did you feel the rears lock before the front?</TD></TR></TABLE>
When I first tested them and anytime under hard braking, the rears will lock way before the fronts everytime.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">i have a stock cx prop valve.....with itr front and gsr rears....i am on my second set of pads in 4 years on the rear...and i only chaged the rears cause one of the pads was 1/4 inch thick...</TD></TR></TABLE>
I have the same cx prop valve, but I have ITR rears, and either carbotech or cobalt front and rear pads from a previous challenge race in its former skin. Your GSR rears must be the difference.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mohudsolo &raquo;</TD></TR><TR><TD CLASS="quote">Did your car originally have discs or drums in back?</TD></TR></TABLE>
drums
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mohudsolo &raquo;</TD></TR><TR><TD CLASS="quote">Have you considered an adjustable one?</TD></TR></TABLE>
I have but I am hoping that an SI valve would resolve that problem since the brakes are very simalar in disk size proportion (1" smaller F & R) but there is a little more weight on the rear wheels on the civic because of the trunk, so if I use factory rear pads I am hoping that will compensate.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Hammond &raquo;</TD></TR><TR><TD CLASS="quote">

If this is true then how come the 99-00 Civic Si prop valve is an IDENTICAL part number to that of the DX/HX coupe and CX/DX hatch (both with rear drums of course)?</TD></TR></TABLE>


EXACTLY!!!!!!!!!!!!!!!!!!!!

and i had drums on the rear and put disks!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Hammond &raquo;</TD></TR><TR><TD CLASS="quote">

If this is true then how come the 99-00 Civic Si prop valve is an IDENTICAL part number to that of the DX/HX coupe and CX/DX hatch (both with rear drums of course)?</TD></TR></TABLE>

Now that is very interesting.... and your sure it's the same part # as the 92-95?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">and i had drums on the rear and put disks!!!</TD></TR></TABLE>

ahh, but GSR rear disks. I wonder if you put GSR disks on the front, would the bias shift more towards the rear....? And what chasis are you running? if it is not a 92-95 Civic HB then the weight distribution is different. My rear is very light.


Modified by B18C5 EH at 8:30 AM 12/18/2004

 

Well, sounds like if I ordered that prop valve I would just be getting the same one...
any other ideas?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Hammond &raquo;</TD></TR><TR><TD CLASS="quote">

If this is true then how come the 99-00 Civic Si prop valve is an IDENTICAL part number to that of the DX/HX coupe and CX/DX hatch (both with rear drums of course)?</TD></TR></TABLE>

This is only true for 96-00 Civics does not apply to 92-95. I went from stock DX brakes to GSR disc and the proportioning valve change is not needed since my proportioning valve is the same as the 99-00 Civic Si. In your case however the proportioning valve matching your setup is not needed that badly but wouldn't be a bad idea when you get around to it, shouldn't be a necessity to go out on track, just use stock rear pads and an aggressive HPDE pad.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5 EH &raquo;</TD></TR><TR><TD CLASS="quote">

Now that is very interesting.... and your sure it's the same part # as the 92-95?</TD></TR></TABLE>

No. 92-95's are different numbers all together. I was just wondering why you wanted a 99-00 Si prop valve when the other cars of that same year had rear drum brakes and use the some prop valve, that's all. Just seems weird. I've known and driven lots of use-to-be rear drum cars from 88-00 Civics all without problem. No prop valve upgrade.

Come on now, the difference between running GSR rear disc vs ITR rear disc is not going to be "my rear's lock up before my front's" vs "I rarely even change rear pads". Negligible at best.

 

If they do lock I want my fronts to lock before my rears, the opposite makes me feel uncomfortable.

 

If they do lock I want my fronts to lock before my rears, the opposite makes me feel uncomfortable.

 

the physics of braking a car tends the rear to lock first because of weight transfer. its not uncommon to briefly smoke a rear tire under braking especially if trail braking. it would scare me a hell of a lot more to be entering a corner with my front wheels locking up.

what are your front spring rates? maybe you have a little more nose dive under hard braking and a stiffer set of front springs would help out. thenagain if you up the fronts you will most likely want to up the rears also.