What size masters are you running
 

front and rear, pedal ratio, piston sizes and pads?

Master Cylinders (front and rear) are 13/16" bore
Pedal Ratio is 6.25:1
Pads are Mintex Xtreme (which appear to want higher temps)

I had the same problem with my
 

twin set-up. With a 6:1 ratio I ended up with a 5/8 on the front and 3/4 on the rear. There is plenty of fluid volume, so do not let someone scare you off with that. With gauges at the calipers, I am developing 1200 psi on front and 1100 psi on the rear with about 100 lbs of leg pressure, which is a hard push. I am running Wilwood 6 psitons up front and 4 pistons in the rear.

Because of brake bias you want the rear master to usually one size larger(more volume, less pressure) than the front to keep the rears from locking first, then use the balance bar to fine tune.

Where I think the size is sometimes missed, assuming the balance bar is set neatural in the center, your leg pressure is being divided by 2. Each system is different and you will need to play with the sizes to get it just right. Huge rear tires and smaller fronts may take the same size front and rear to get maxium braking out to the car.

Put a set of gauges on and get a reading. I would size the front down to 3/4 and leave the 13/16 and see if it gets any better. You should be able to lock the fronts with 1000 or so psi.

I am not familiar with the pad, but it may be a combination of not enough pressure along with the pad. If it is a track pad it will kill your rotors if you are not generating enough heat. I would get a set with a compound you can use on the street and maybe autocross and save those for open track stuff.

Not that it is the same but I have BP-10's for the street and a set of "b" pads for track days.

I can tell you I have messed with mine for at least a year to get it right. Numerous phone calls and hours spent on calculators. Ron (guy with the 68 and the twin turbo mustang motor) runs 3/4 front and rear on his dual set-up.

Wow – what a great weekend!

It’s hard to put the last five days into words but I’ll take a shot at doing it justice.

As many of you know, after the Goodguys show in Del Mar, the Camaro went home with David and Mary Pozzi for some much needed tweaking. The car was coming around but there were still some suspension setup issues that needed to be addressed – a rear bar being first and foremost on the list of must dos – and the Pozzis were the more than up for the task. When I got to California on Wednesday the new rate adjustable rear bar (a modified Hotchkis second gen piece) was in place and ready to go and we were going to finish up a couple of things Thursday and leave for Willow Springs mid day on Friday. That was the plan…

http://www.onelapcamaro.com/WillowSp...rear%20bar.JPG

Thursday and Friday we made wholesale changes to the suspension tuning. David picked out some new springs – stiffening the car up front and rear – and we added proper bump rubbers to the shocks for some added protection. We reset bump steer up front, adding “some” additional spacing between the steering arm and the end links.

http://www.onelapcamaro.com/WillowSp...mp%20steer.JPG

We increased the ride height by ¾” of an inch front and back and corner balanced the car properly (for what it’s worth, we wound up with a 49.7% cross weight and 54 / 46 % front to rear). Finally we aligned the car and completed a nut and bolt inspection, (which necessitated a minor, last minute tweak)…

http://www.onelapcamaro.com/WillowSp...clearance2.jpg

…eventually giving the car a clean bill of health for the weekend. At 9 pm on Friday we loaded up the trailer and, after a quick dinner and a couple of hours of sleep, we hit the road at 2 am for the 6 hour drive to Willow Springs.

Despite all of us being completely bagged, the drive to the track was smooth sailing. Mary made it to the track first with the car and had it though tech when David and I arrived in the motor home – with about 5 minutes to spare before the drivers meeting.

http://www.onelapcamaro.com/WillowSp...Willow%201.JPG

After filling the car with some 100 octane race fuel David took the first lap of the weekend in the ‘beginner’ group (sorry about that David)

http://www.onelapcamaro.com/WillowSp...t%20MP%201.JPG

and came back with a big grin and suggested only a minor adjustment to the brake bias.

http://www.onelapcamaro.com/WillowSp...Willow%202.JPG

I was up next and after getting settled in the car had only a brief moment of panic and frustration when, upon turning the key – absolutely nothing happened. After some quick diagnosis – made a bunch easier thanks to the self diagnostics of the ISIS system – found that I had knocked some relays loose when I was adjusting the brakes. The rest of the day was as close to “flawless” as I could have hoped.

http://www.onelapcamaro.com/WillowSp...t%20MP%202.JPG

David and I continued to alternate sessions, making minor brake and ride height adjustments through the day (Mary thought the car looked like a “backwards stinkbug” when the front end came up onto the straightaway).

http://www.onelapcamaro.com/WillowSp...t%20MP%203.JPG

The only hiccup for me occurred in the final session of the day – as I approached the rumble strips on the far end of the track the car ‘hesitated’ briefly; it wasn’t much but I pulled off a couple laps early to try to see if there was a problem. Nothing was obvious so we parked the car and called it a day.

http://www.onelapcamaro.com/WillowSp...f%20Willow.JPG

I took the opportunity that evening to walk the track and make some more detailed notes on lines and how far I thought I could push things here and there. There are a lot of elevation changes on the track so some things were a little deceptive from inside the car. Finally (ok, it was 8 o’clock) I retired to the trailer and called it a day.

Sunday morning was more of the same. Up bright and early (just barely beating Carl and Chad) and back onto the car. There was one point that morning, as everyone was getting settled at the track, when First Gens probably outnumbered any other group in the pits – I had never seen so many great cars together in one place outside a show – it was really cool. Back to business - fill with gas again, drop the car another ¼”, dial in a little more rear brake and back on the track.

http://www.onelapcamaro.com/WillowSp...%20Sun%201.JPG

Since we were lapping most of the red group we moved up to the intermediate group which gave us a chance to play tag with Carl and his awesome ’68.

http://www.onelapcamaro.com/WillowSp...%20Sun%202.JPG

For the most part Sunday was a repeat of Saturday – no real problems but a lot of fun. I did have a nagging warning light coming on throughout the day and seemed to be a little bit slower than I had been on Saturday but I couldn’t see anything wrong on the dash so kept an eye on it and continued until the last session. There were three outings in a row where Carl and I seemed to be in a world of our own out there – we were swapping spots every few laps and pushing each other every lap, passing Mustangs, ‘Vettes and everything else we could get around like they weren’t even there. It was honestly the most fun that I have had in the OneLap car since the day I started the project.

http://www.onelapcamaro.com/WillowSp...%20Sun%203.JPG

In kind of a repeat of the previous day, the last session ended a bit early for me… I was noticing that the warning lights were becoming more frequent and the car was hesitating more often. There was also a bit of a noise coming from the front end that I couldn’t put my finger on so, after nearly looping it once on the straight and finding it difficult to keep up to Carl and Rocco, I reluctantly pulled into the pits and called it a weekend.

http://www.onelapcamaro.com/WillowSp...Willow%204.JPG

It didn’t take long to find the first problem… with the car running the dash was showing less than11.5 volts – definitely not enough to keep an LS engine happy. Monday we found the other minor issue of the day – the front brakes were dragging (a lot). It turns out that the last bias adjustment took the front pushrod just slightly out of its comfort zone and the MC wasn’t fully releasing the front brakes – hence the squeak and the sudden desire for the back end of the car to try to pass the now slower front of the car. Likewise, the charging problem was traced to a failed regulator in the alternator.

SO… trying to shorten a really long story…

Thank you so much to David and Mary for their help, hospitality, and patience. David’s mentoring, advice, and input helped me a ton both in setting up the car as well as driving it and seeing where improvements can be made. Mary’s enthusiasm, drive, and screaming (including the incredible hissing gopher incident) went a long way to help maintain focus and make the weekend an overwhelming success.

The car is now getting prepped for the Nevada Open Road Challenge next week. Repairs have been made to the brake bias and the alternator and a couple of subtle improvements are being worked in.

Thanks again to everybody and to the LA Shelby Club for putting on an awesome event. Hopefully we have an opportunity to do it again sometime soon.

And some video from Sunday - mostly chasing Carl around...

SplitterVision with Carl (Camaro) and Rocco (Mustang)


Vent Windows... gotta love 'em...

WOW! You had one hell of a weekend. What lap times did you run compared to David? Good luck in the SilverState :thumbsup:

the car looks awesome.

I can't tell you how N V US i am to see you having a good old time with your car. Thank you for sharing the pictures.

Very jealous myself! Car looks great.