Low Vacuum with big cams

[purxr6t]

Yeah the brake pedal is like a rock in bad traffic which is annoying,

Pretty much have one hit of the brakes then there's no more vacuum.

 

Good that the vacuum canister worked,

Have also seen the electric vacuum pumps for sale as well for around $475 or something.

 

Heard some Mondeos have a factory electric vacuum pump,

Seems like it might be OK too,

Would try to plumb it in so it could only add vacuum,

And work as normal if the pump failed....

[Puffwagon]

Not being facetious but you can just press the pedal harder, I did that with mine all the time. I also had a split booster in my other car and the pedal was like a rock in that. I'd just press the fark out of it and it worked fine. Not so much for the missus though lol.

 

Thinking outside the box here, you could raise your idle speed a couple hundred rpm, might be enough to make a difference you can live with.

 

Another outside the box fix could be raising the ignition timing at idle to 20 degrees to get it to idle high, but close the throttle blade a bit too make the idle normal again. Having the throttle blade closed more would create a lot more vacuum at idle and decel. You would have to tune for it but it seems feasible. I'll see if I can get it to work on my car and let you know 

[purxr6t]

That sounds like it could work.

 

As for the pressing the pedal harder thing several people drive the car,

Females included.

 

I myself have also driven with a blown booster too and just pressed harder.

In heavy traffic when people are jumping in front / cutting others off at the last second,

It would be best to have it functioning more normally as

It takes longer to stop than it would with better brake vacuum.

 

It already has 6 piston brake callipers etc.

[xr6tForMe]

I thought "There may also already be a product specifically for this application somewhere?" and found these

https://aeroflowperformance.com/brake/brake-accessories/vacuum-pumps

 

Then I found this for $147

BRAKE BOOSTER VACUUM PUMP FITS Expensive Daewoo Late model camira VE VF V6 V8 HOTROD GM 92227002

Edited 27/02/24 11:05 PM by xr6tForMe

[Puffwagon]

The Late model camira one looks like a pretty easy solution. Cheap enough too that if it sucks, or rather doesn't suck enough, you can just donate it to goodwill.

 

Edit: it pulls 29.5 inhg or 14.5psi vacuum, that's more than a stock barra at idle.

Edited 27/02/24 11:33 PM by Puffwagon
I've often wondered how much you can type into the edit box...

[xr6tForMe]

I think it would also need a couple of other items, like those listed on the aeroflow site.

-a one way valve, so it is not just sucking from the intake manifold and

-a vacuum switch so it only runs when necessary

These might also be available for the commodores.

[purxr6t]

That sounds like it could work.

Seeing as it used on a factory vehicle it seems easy enough.

 

One would think it would have an inbuilt system to turn off once a set vacuum is reached,

If not it seems easy enough to make something that will work.

 

The more factory stuff the better though.

 

Yes would use some one way valves etc, 

So that whichever is producing the most vac. works,

And the vac pump isn't sucking from the manifold,

Etc.

 

How did adding more advance at idle go @Puffwagon?

Did it make more vacuum?

 

Thanks for all the replies,

They were very helpful.

 

Cheers.

[Puffwagon]

I haven't tried it yet, I forgot, I'll get onto it tomorrow.

[purxr6t]

All good,

            It sounds like it could work as well.

Looking forward to seeing if it does.

 

Cheers.

[Puffwagon]

I haven't forgotten again lol but I've been tied up most of the day and now it's dinner time and kids etc. Haha I will go out there and make some changes tomorrow morning and update then.