Sierra Master cylinder with outlets on top/bottom/driver?

[dank]

Ok well the bloody 20v 4age intake plenum is a massive thing designed to get even volume of air to all 4 individual throttle bodies.

I've dumped the body back on my zook and what I suspected has eventuated. The air intake plenum hits the master cylinder brake line outlet.

Not good.

This shows the intake assembly intact without the master cylinder:


This shows the bottom half of the plenum with one of the intake trumpets in place to show the clearance.


The obvious way to go is to get a custom intake plenum fabbed up which is no real problem but I am hoping to keep it as stock as possible as toyota obviously designed the intake in that fashion for certain reasons. Mucking around with the length of the trumpets starts causing differences in the torque curve of the motor. As far as my research goes the shorter the trumpet the higher the torque curve peaks towards higher rpm, losing any low end torque that the engine may have...which is not much at all in the first place.


My question is, does anyone know of a master cylinder that will bolt up that has the line inputs on the drivers side, top or bottom? this will give me room to run the standard intake.

I have heard forester? not sure on outputs though...

[PJ.zook]

Yeh looks like a Forester master cylinder will fix youre problems. Heres a pic of mine, the outlet is at the top for rears, and the side facing battery for fronts.



I got mine from the Subaru wreckers right next to Moorabbin airport i think it was, for around $150ish

[dank]

Nice one PJ. Thanks. Can you remember what year Forester it was? I know Jayson B4T was looking at this mod...

I also found a Suzuki Swift Cino models 94-99 and Holden Barina MH series master cylinder looks like this and could solve my problems as well. Only issue is that it has 3 outlets I'm guessing two for the front and one for rear drums. considering i'll be going 4 wheel disc the forester one might be the go as the proportioning will be set for all wheel disc...

swift/barina type

[mrcurlywhirly]

Just interested... How can you be sure the Forester MC will not result in an overbraked Sierra? My Foz is around 125KW and close to 1500KGS, even the base was around the 90KW mark at a similar weight. Wouldnt that result in a hair trigger braking setup for a lightweight and low powered (standard) Sierra? particularly if you go four wheel disks?

Underneath i want it bad, braking is not our Sierras strong point..just like to know how the calculations are made.

[dank]

My zook wouldn't be too far off those specs. The engine in new condition makes around 120kw and my zook isn't the lightest around, full trail ready setup would be pushing 1150-1200kg upper limit at a guess.

Bar + Winch = 85kg
4age 20v + auto = 150kgish
34s on 15x8 steelies = 40kg each
recovery gear = 15kg
spares box 10kg
water= 5kg
random stuff = 10kg

All adds up.

[Guy]

Also remeber that the subie has much larger rotors\callipers and smaller lighter wheel\tyre combo.

[PJ.zook]

Its not weight that affects it, its the size of all youre cylinders.
If you have a larger bore master, its going to move a lot more fluid than the smaller oem master. Since the calipers/drums still require the same amount of fluid to function normally, it means youre going to have a lot less movement in the pedal for the same braking force, plus the pedal will be harder to move.

My brakes are pretty sensitive at the moment due to the larger master cylinder, but thats not for long as im going to be upgrading again soon.

[MART]

Dank , you'll be surprised how much more it ways than that , also the 75 kgs for each adult , you will probably be under braked for that much weight and tyre size , also exceeding the GVM for the vehicle , when I had my truck the engineer stated that I could not have run the 35's without the brake upgrade which was the hilux front rotors and the rodeo rear rotors , both obviously of larger vehicles , I was up arround 1500 kg empty , Cheers Paul.

[built4thrashing]

hey dank . Ive got that suby master here if you wanna come have a look at it all. Ya can borrow it to do a test fit too if you want. Just remember to give it back.


B4T

[dank]

Hey MART, before the engine upgrade I was pretty happy with the braking power with rear drums and standard front rotors. I will be going to a lwb vitara rotor and caliper in the front and sierra front rotors and calipers in the rear. It should be a lot better than what it was. Plus I have a transfer mounted disc handbrake setup as well which used to be my main worry when wheeling....not having a decent handbrake to hold the vehicle on a steep slope.

In essence I agree with you, adding all the fluids, bigger battery, driver, passenger plus everthing above will make it a fair bit heavier than stock, but I don't have a cage yet. I would be surprised if It topped 1500kg.


Jase I might pop past one day soon to borrow that master cylinder although I've found that a barina cylinder from an early model also has a remote reservoir which will make it even easier to fit....

[built4thrashing]

the barina wont give you any improvement in brakes but. it has the same bore as the sierra i think where as the forester one is larger. better suited to bigger brakes and already suited to rear disc.

B4T

[mrcurlywhirly]

OK, switching the brake mc on a 120KW - 1200kg zook with bigger wheels and wider tyres makes more sense.
I was thinking more about a standard Sierra.. our LWB is only around 870KG unladen, and makes bugger all power - maybe 30kw, plenty less than a Forester.

[boost=money]

is there a mc that is a direct replacement that will increse brakeing power and what about booster? sorry to change subject.

[dank]

Type - "brake and master and cylinder" into the search function, limit to "suzuki" forum and start reading...

have fun. Its all there.

[PJ.zook]

is there a mc that is a direct replacement that will increse brakeing power and what about booster? sorry to change subject.

The only thing that will increase braking power is a better/larger caliper and disc setup.
Enlarging the booster will only give you less effort in pressing the pedal, not increase peformance of brakes.
Increasing the size of the MC will only make it harder to press pedal along with much shorter pedal travel, unless you also upgrade youre calipers to larger (or more piston) units which require more brake fluid to move.