Stett Performance Vacuum Canister Review

[ajm8127]

Not volume as in flow. More like storage volume.

I think this is correct. They are similar to hydraulic accumulators.

The reservoirs even out the pressure in the system when an event occurs like the solenoids open fully to spool the turbos or when the brake pedal is pressed. Without the reservoirs the vacuum system volume is small so any flow to the waste gates or brake booster would result in a larger pressure change in the system until the vacuum pump can catch up versus a system with reservoirs. I don't think it is a mistake that they are placed close to the solenoids.

They are like capacitors in electronics. Capacitors store electric charge and resist changes in voltage. One way they are used is to keep voltage consistent when changes in current, or flow of electric charge, occur. The vacuum reservoirs keep vacuum system pressure consistent when changes in vacuum flow occur.

I agree that if the reservoirs are replaced, the replacement should have the same volume. I don't think it is important if that volume in made up by one or multiple reservoirs.

 

[martymil]

Combining them wont be a problem as long as you have 2 separate outlets going to the solenoids

 

[screaminfast]

Combining them wont be a problem as long as you have 2 separate outlets going to the solenoids

Two outlets vs a Tee?

 

[martymil]

You don't want to do a tee as it halves the flow.

 

[screaminfast]

You don't want to do a tee as it halves the flow.

So based on my design earlier. I could have a bigger inlet size and two outlets to the solenoids. Since I replacing the factory vac line anyways.

 

[martymil]

Yes that's what I do for customers that want it, I do an under ff manifold version.

 

[screaminfast]

Yes that's what I do for customers that want it, I do an under ff manifold version.

10mm for that bigger line right?

 

[martymil]

I use 6an which is plenty and is around the same size as stock.

I custom made my whole line from vac pump to booster

Make sure to use the right hose as most think any hose will do but they collapse under heat.

You want to use a braided hose or similar.

 

[screaminfast]

I use 6an which is plenty and is around the same size as stock.

I custom made my whole line from vac pump to booster

Make sure to use the right hose as most think any hose will do but they collapse under heat.

You want to use a braided hose or similar.

So don't use silicone vac line for that hose?

Was gonna get this stuff: https://www.verociousmotorsports.co...e-Vacuum-Hose-Platinum-Cured-Sold-by-the-Foot

 

[martymil]

you can use silicone vac line for the small hoses but for the main booster hose use a braided reinforced line.

 

[screaminfast]

you can use silicone vac line for the small hoses but for the main booster hose use a braided reinforced line.

Ok Sounds good. So -6 for the main booster hose with a Tee going -6 to my vac canister, then 3.5mm silicone to the solenoids. Solid plan?

 

[martymil]

Sounds good

 

[martymil]

if your anal for detail you can use a one way valve on the vacuum pump to canister so the vacuum does not drop when applying the brakes repeatedly or you have a vacuum operated flapper on the exhaust.

It does help with wgc.

 

[screaminfast]

if your anal for detail you can use a one way valve on the vacuum pump to canister so the vacuum does not drop when applying the brakes repeatedly or you have a vacuum operated flapper on the exhaust.

It does help with wgc.

Good Idea. -6 check valve. I don't have the exhaust flapper anymore.

 

[martymil]

yep any check valve will do, VTT has some really good cheap ones.

 

[screaminfast]

Latest revision:

2 x 5" 6063 extrusion, -6AN welded bung input, 2 x 1/4 NPT weld bungs on output. 1/4 NPT to .170" hose barb. Will use a vibrant -6AN Male to Female check valve on the input side.

 

[ajm8127]

6AN from the pump to the reservoir seem enormous. Lets say the ID is 0.34", which seems to be pretty close to a few hose vendors 6AN. This is a cross sectional area of 0.091 in sq. Two 0.125" lines have a combined cross sectional area of 0.025 in sq. More than three time more cross section with the 6AN hose than with the stock hoses.

I suspect the lines from the reservoir to the vacuum pump can remain 1/8 inch. These do not need to be high flow because that is the point of the reservoir - the reservoirs store vacuum to minimize the changes in vacuum pressure. In fact it might be advantageous to have a smaller line between the reservoir and the pump to limit the flow that can revert back from the reservoirs to the brake booster. This is why you would put a check valve in a 6AN line.

6AN and a check valve won't hurt, but it seems way over engineered when the stock lines are 1/8". I don't really think there would be a benefit to a change like this especially when the lines that matter (reservoir to solenoids to waste gates) are still 1/8", but it is your money.

 

[screaminfast]

6AN from the pump to the reservoir seem enormous. Lets say the ID is 0.34", which seems to be pretty close to a few hose vendors 6AN. This is a cross sectional area of 0.091 in sq. Two 0.125" lines have a combined cross sectional area of 0.025 in sq. More than three time more cross section with the 6AN hose than with the stock hoses.

I suspect the lines from the reservoir to the vacuum pump can remain 1/8 inch. These do not need to be high flow because that is the point of the reservoir - the reservoirs store vacuum to minimize the changes in vacuum pressure. In fact it might be advantageous to have a smaller line between the reservoir and the pump to limit the flow that can revert back from the reservoirs to the brake booster. This is why you would put a check valve in a 6AN line.

6AN and a check valve won't hurt, but it seems way over engineered when the stock lines are 1/8". I don't really think there would be a benefit to a change like this especially when the lines that matter (reservoir to solenoids to waste gates) are still 1/8", but it is your money.

You're absolutely right. When costs of say -4 or the .170" fittings are the same as 6AN, it seemed to make sense. Since I'll be running 6AN for the brake booster line and re-routing it more cleanly, it made more sense to use a 6AN tee and an extra 6AN line vs a 6AN tee with an 1/8" NPT port and another nipple. If I could run -4AN or -3AN all the way to the solenoids I would, but I'm still twins and factory solenoids.

 

[martymil]

No such thing as over engineering, you done the canister the way it should have been.

Now go and build it I love to see the finished product.

I'm glad I'm not the only one that loves doing their own stuff instead of just buying what's available off the shelf.

 

[derekgates]

I don't have the skills to make on my own, but would love one of these custom canisters!

My canisters work fine, but they are rather large and ugly...