brake booster with high lift cam

[unfamilia 1,938]

Maybe not specifically Ford orientated but what do you do with a brake booster when you install a high lift cam.

Due to the decrease in the manifold vac pressures I've read you get poor low speed brake assistance.

 

Options I've read or been told are :

 

Gut the booster and block the line just run unassisted.

 

get a 12v vac pump

 

Get a vac canister and t it in line for added capacity.

 

 

I'd consider the 2nd option possibly or first as I've driven un brake boosted cars a lot of my life. They aren't bad if under 1000kg.

[RAWDEAL 222]

Gut the booster and block the line just run unassisted.

 

lol maybe if you changed the master cylinder? otherwise it would be terrible.. 

 

id just get a combo of option 2 and 3 and you should be sweet 

[slydog 7,873]

Duration not lift causes vac issues.I run 686 lift 286 @50th and with the hose still conected I have a soft pedal. The webers how ever have no vac port and I have a ED falcon cruise control pump and vac can for booster assistance but TBH its not needed as you get use to the stiff pedal in no time.

[unfamilia 1,938]

So what's your set up sly?

You just disconnect hose?

[Thom 6,650]

What about using a alternator/vac pump setup like some 4 wheelers and light jap trucks use

[unfamilia 1,938]

Where do I find them cheap thom? Haven't seen one before.

[wagoon 2,429]

Duration not lift causes vac issues

So around what duration does the cam start to effect the booster? Or at least have a noticeable effect

[Thom 6,650]

Where do I find them cheap thom? Haven't seen one before.

 

80's Japanese diesel 4wheel drives (nissans/some toyotas) are a few cars I've seen them in, also late model commodores have an electronic vacuum pump that's quiet, but they may be pricey if you were to buy one new

[slydog 7,873]

So what's your set up sly?

You just disconnect hose?

 

When I run the webers I just brake with out the pump pretty much but I have a comp cams reservoir tank under the dash and the pump sits behind the left front guard. When I want power brakes I turn the pump on...soft pedal.

 

With the 4 barrel I just hooked the hose up to the vac port on the back of the carb...power brakes,soft pedal. Oh roller cams prob help there though...my bad just thought of that  

[ando76 4,354]

The booster just improves pedal effort and not performance.  it means you will need to push the pedal further to get the same result - unboosted.

 

I fitted a 12v vac pump and reservoir to my speedway car because I very rarely used the brakes - but when I did I needed them - LIKE NOW.  It worked very very well.

 

I am working with the engineer on the Honda VTEC powered mini project and he is a big fan of no booster at all on his cars.  He loves street sprint style events and drives his race car on the road - full rego.  Provided the master cylinder size and caliper piston sizes fall within specs he says no booster is required and encourages running without them  - WHY?  More pedal feel.  Yes you have more travel, but you gain more feel. 

 

It all comes down to what you are happy with feel wise.  If you want a short sharp pedal - you can't beat the vac pump and reservoir.  I just used the Summit kit - when the $$ was good. 

[unfamilia 1,938]

I actually prefer no booster cause that's what I'm used to on all my older cars. This is my first with booster

[unfamilia 1,938]

Those alternator pumps need an oil feed and return. Yuck

[unfamilia 1,938]

So for an oil feed would I just t into the oil pressure sender? Obvious choice

For the return is it just a line with a Bung into the sump? Above or below oil line as it includes air from the pump.

 

I'm thinking booster less may be easier

[slydog 7,873]

Well yes of course but if you want soft pedal...Falcon cruise unit,Comp tank and your set.