big red race valve

[JeremyH]

Here you can see it in action, open at idle then slightest touch of the throttle it snaps shut then opens again to vent when you let off.
(keep in mind its upside down in the vid lol)

 

[onequicktang]

well my vacuum seemed pretty low since switching to the procharger. like 6 at idle compared to 14 when i had the whipple.

 

[19COBRA93]

well my vacuum seemed pretty low since switching to the procharger. like 6 at idle compared to 14 when i had the whipple.

If you're seeing only 6 at idle you have a vacuum leak or something going on. I was around 14 with my Procharger, and still 14 with the rotrex.

 

[onequicktang]

im thinking maybe its the big red. no vacuum leaks anywhere else.

 

[19COBRA93]

im thinking maybe its the big red. no vacuum leaks anywhere else.

The big red, or any bov, should have no effect on your vacuum unless it's leaking.

 

[onequicktang]

no idea. procharger was the only thing that was changed from the whipple. still have great brakes, and no other issues with the low vacuum.

 

[19COBRA93]

no idea. procharger was the only thing that was changed from the whipple. still have great brakes, and no other issues with the low vacuum.

Well, considering the whole intake manifold get's changed as well, it's a possibility.

 

[onequicktang]

ya thats true, with delete plates, its kind of hard to listen for any hissing under the hood with the procharger now to lol. my afr is spot on tho so that kind of eliminates a vacuum leak?

 

[t-kid]

Where's youre wideband located?

 

[onequicktang]

right after my long tubes.

 

[t-kid]

right after my long tubes.

So it's reading adjusted AFRs?

 

[gt08vapor]

I see -18 vacuum at idle with my pricharger and red race bov. I would say your leaking somwhere

 

[05stroker]

What size pulley is on the car?

 

[t-kid]

You didn't answer my question...

If your wideband is located after your primary and secondary o2 sensors it's doing you no good...

 

[Godzirra]

It's still probably reading fairly accurate if no cats are in place

 

[19COBRA93]

You didn't answer my question...

If your wideband is located after your primary and secondary o2 sensors it's doing you no good...

It has nothing to do with sensors, it's more about before or after the cat.

 

[t-kid]

It has nothing to do with sensors, it's more about before or after the cat.

If it's post sensor in a closed loop setup its reading "adjusted" AFRs is it not?

 

[19COBRA93]

If it's post sensor in a closed loop setup its reading "adjusted" AFRs is it not?

The sensors themselves don't adjust afr. They simply send readings to the PCM for the PCM to adjust. The afr is what it is once it leaves the exhaust port. Unless there's an exhaust leak, it doesn't change. AFR is only changed by the PCM via the injectors. If that makes sense.

 

[gt08vapor]

What size pulley is on the car?

I run a 3.4

 

[t-kid]

The sensors themselves don't adjust afr. They simply send readings to the PCM for the PCM to adjust. The afr is what it is once it leaves the exhaust port. Unless there's an exhaust leak, it doesn't change. AFR is only changed by the PCM via the injectors. If that makes sense.

I was under the impression the PCM adjusted fuel trims with voltage regulation from measurements taken by the o2s and MAF... Thanks for the info!