How Much Secondary Leakage?
 

Just how much does your secondary vacuum system leak?
With your ign key turned on and engine not running
how much time does your aux pump stay off.
That is, once it runs for a time (maybe it keeps running)
how long (in seconds) does the pump stay off?

PLEASE if you deleted the secondary do not vote.
PLEASE use actual numbers, don't guess.
If you have more than one ZR-1 sorry you can only vote once
(only because I blew it when setting up the poll)
If your aux pump keeps running then the off time is 0 seconds.

Re: How Much Secondary Leakage?
 

I Concur with Marc :cheers:
If the vacuum pump cycles 5, 10, 15 seconds or at all....the vacuum system is NOT TIGHT but normal and functional for the age of the vacuum system with components not replaced with NEW LINES AND NEW RUBBER (soft) CONNECTORS.

Disconnect the drivers side center plenum vacuum source and hold your finger over the rubber connector disconnected (Engine OFF but Key ON). IF THE SECONDARIES (Secondary Canisters) FUNCTION AND HOLD POSITION WHEN TESTING SECONDARIES WITH PLENUM IN PLACE (Key on) Verifying Secondary Actuator Operation with the Plenum in Place END OF DISCUSSION ;)

I will think further on this but for now I am busy planting corn and beans ;)

Re: How Much Secondary Leakage?
 

Bwwwahhhhh ha ha ha ha
After this we'll have a poll on how many still have their tire pressure sensors in place and leave their tire pressure at 26psi.
And how many run their cars on bald tires.

I just remembered. I still check the washer fluid
every now and then but almost never drive it in the rain.
Kinda funny.

But seriously ......
I don't think Mark H. is advocating NOT to fix your
vacuum leak, just that a 1 sec cycle time will not effect secondary operation. Of that I'm not sure I agree. What I do know is that
if you have a leak big enough to cause a 1sec cycle time then there's not much wiggle room before you're at a bigger leak where as the pump runs constantly and you'll get a code 61 and loss of power above about 4000rpm. Just fix the dang thing before that.
It doesn't even take baling wire to fix just patience and the resolve to do so.

Re: How Much Secondary Leakage?
 

91= 2.5 min.
93= 45 sec.

Re: How Much Secondary Leakage?
 

WOW! 2.5 min is the top score so far. She's tight!!!
I get 66seconds on mine.

Re: How Much Secondary Leakage?
 

Marc, just went thru the system when I had it up for the 510 package :dancing

Re: How Much Secondary Leakage?
 

Pump runs one second every five. Have a new vacuum solenoid and MSD coils to install this week. New left side oxygen sensor yesterday as i moved it from right to left and the code followed. Rear tires are bald and the washer fluid is full.

Re: How Much Secondary Leakage?
 

Interesting stuff! Thanks for taking it a step farther and starting this thread, Scott!

Re: How Much Secondary Leakage?
 

It's good to get things documented. When a reference is made to "average" ZR-1 then we know what's what.

Re: How Much Secondary Leakage?
 

I just recalled that the source of the leakage on mine was a real slow seepage out of the mini vacuum tank. This was a couple years back when I was testing the tubes with a handheld vacuum pump. It totally doesn't matter as the pump sucks air way faster than anything could possibly leak out besides a torn diaphragm.

I guess if my pump turned on every 5 seconds, I'd try to improve that, but otherwise it is just an academic discussion.