Stett Performance Vacuum Canister Review

[martymil]

Its not insufficient at stock boost levels but when you start to crank up the boost the boost solenoids need a lot more volume of vacuum to operate especially when pushing the turbos to near their limits..

I upgraded all my vacuum lines also through out the whole system to minimise any possible restrictions as well.

Did I need to ?

Most probably not but why not, wont hurt and its cheap.

 

[Jeffman]

Just a WAG, but I suspect one could easily measure throttle response time by logging with the stock vacuum canisters and then with the Stett vacuum canisters. OP may have stumbled upon something, but let’s see some objective data to support his subjective observations.

 

[Mikejones1208]

You know nothing about my car. There was no placebo effect. The throttle response definitely became sharper. Not due to the canister being inherently better than the plastic version in any secret way but due to the fact that it had zero leaks vs. The plastic ones which were less than a year old. I am well aware of the contents of the plastic empty canisters. You keep wanting to discount my report... go ahead, but don't misread my reviews.

The canisters are simply leak proof and that is why I had better response. No magic, no secret sauce.

People come to reviews with their know it all attitudes trying to talk down positive reports... "oh l, it's just placebo..." or "oh, it's only because your old canisters were leaking..." Well no shit they were leaking. That's the whole point of getting metal ones. I did not want to delete the stock design but wanted peace of mind so I upgraded to indestructible canisters. Just so happens the upgrade yielded improvements I noticed. I did not expect to feel any improvement, but I did... end of story.

Finally, you're the one who says that it is deletable and I am the one saying don't delete the design but just upgrade and keep factory setup... and you are saying that I am spreading false information? I am not the one that even considers deleting a factory design just because I see no effect. You think they decided to add two items because they wanted to spend more on production??? Wtf?

Please show me one place in this thread where i said to delete them or that they were deletable...... I'll wait. So now your agreeing with me? And admitting your old ones were leaking..... My work here is done

 

[The Convert]

Please show me one place in this thread where i said to delete them or that they were deletable...... I'll wait. So now your agreeing with me? And admitting your old ones were leaking..... My work here is done

Arguing with him is like wrestling with a pig.

 

[SlowE93]

Its not insufficient at stock boost levels but when you start to crank up the boost the boost solenoids need a lot more volume of vacuum to operate especially when pushing the turbos to near their limits..

This is a pretty good point and most likely overlooked by many. Mostly everything on our cars were designed to work effectively as designed for stock application. Pcv, intake flow, cooling, driveshaft, halfshafts, transmission, pistons, rods, etc

 

[matreyia]

Please show me one place in this thread where i said to delete them or that they were deletable...... I'll wait. So now your agreeing with me? And admitting your old ones were leaking..... My work here is done

Well no shit they were leaking. I told you the metal ones made the throttle response better. You're the one talking as if I said they were special or something... the metal ones have zero leak...that's why there was improved response.

Are you on crack?

You thought "razor sharp response" was me saying that the metal canisters were some magical thing??? That's your error. The improved razor sharp response is due to zero leaks vs. The plastic crap ones. You are the one needing reading comprehension. Read the review again, then read your comments afterwards where you said I spread fake information. What fake information are you referring to?

 

[martymil]

Count to 10 people and lets have a civilised conversation.

There are lots of overlooked parts of our cars that need addressing, the people that push the boundaries and records dont say anything because of these type of attacks on them.

They all might be small or minute gains but when you add them all up they equate to reasonable gains.

Then people wonder how did he do that, i can't so must be bull shit right ?

I think there are gains to be had by getting better boost solonoid than our crappy ones, I tried talking about it years ago but got shut down.

I've had two sets of boost solonoid fail on me in the last 3 years and they aren't cheap either.

Converting to something like the single turbos guys use would be heaps better and more durable and much higher flowing for better boost control.

But unless someone like mhd done something we are stuck using the plastic sub par crap bmw is pushing on us located it a position that just cooks them like chest nuts on a pan.

 

[fmorelli]

Its not insufficient at stock boost levels but when you start to crank up the boost the boost solenoids need a lot more volume of vacuum to operate especially when pushing the turbos to near their limits..

I upgraded all my vacuum lines also through out the whole system to minimise any possible restrictions as well.

Did I need to ?

Most probably not but why not, wont hurt and its cheap.

This is where I get lost. A lot more volume - the orifice of the solenoid is fixed and that limits the volume given a fixed vacuum amount. Boyle's Law? I'm just lost and how the solenoid is getting more volume with a fixed orifice. Oh well.

With a different solenoid, with a difference orifice size I could see greater volume. With a higher vacuum I could see a greater volume. It's not my field, though, so I probably have this wrong.

Filippo

 

[SlowE93]

This is where I get lost. A lot more volume - the orifice of the solenoid is fixed and that limits the volume given a fixed vacuum amount. Boyle's Law? I'm just lost and how the solenoid is getting more volume with a fixed orifice. Oh well.

With a different solenoid, with a difference orifice size I could see greater volume. With a higher vacuum I could see a greater volume. It's not my field, though, so I probably have this wrong.

Filippo

Not volume as in flow. More like storage volume. Like an air compressor with same motor, fittings, etc but larger tank. Stroker motor with same intake and exhaust still yields results as it breathes more air through the same orifice / intake and exhaust.
A larger resorvoir just means you wont run out as fast, wether its water, air , gas, etc. Larger lungs if you will. Bike tire vs Big Rig tire. Same orifice / valves. Release the air from both. Which one runs out of breath faster ? Regardless of same orifice as all schrader valves are basically the same, still more volume.

 

[martymil]

Lets look at it this way sucking through a super long skinny straw or sucking through one 30% bigger which would be easier for the port to breath through ?

The gains aren't great and even small but still better than stock and the solonoid is still the restriction.

If you look at the stock hoses they are tiny compared to a quality aftermarket one and are smaller in size than the port.

Well mine where at least that's why I changed them.

Any improvement is for the better, even if it's 5% more flow but its more like at least 20 to 30 judging by the size.

If it decreases wgdc only 5% it was worth it as the mod is less than 20 dollars in rubber vacuum hose and a set of cans.

 

[fmorelli]

This is what confuses me:

Lets look at it this way sucking through a super long skinny straw or sucking through one 30% bigger which would be easier for the port to breath through ?

So ... suck through a super long 3mm straw attached to a 2mm ID orifice at the end of the straw. Then install a super long 5mm straw to a 2mm orifice. Which is easier to breath through? They're the same best as I can tell.

If you look at the stock hoses they are tiny compared to a quality aftermarket one and are smaller in size than the port.

This makes sense to me. If the ID of the stock hoses is smaller than the ID of the solenoid orifice, getting an hose ID at least the same size as the solenoid orifice makes a difference. But that is a hose undersize to orifice position, not a general "the bigger the hose the better the suck".

Filippo

 

[martymil]

But if there is bigger line going to the 2mm port it will never run out as the line is bigger and so is the supply, by running a smaller line and supply like stock there won't be enought vacumm supply for the solonoids to operate the Wastegate diaphragm properly.

Slower response, more lag and less throttle response due to less initial boost.

The gains are small but they are there, gains like inlet manifolds, ic piping, turbo manifolds and so on that people say there are only tiny gains to be had but when all those little gains are added up they make substantial ones as you just got rid off all the small restrictions

So if you look for and get rid of all of them you might be surprised how much you'll gain in the end, but most of the time those little restrictions can be very costly.

 

[Benji335i]

Sorry to re hash an old thread. I am trying to source these and Stett don't seem active in the BMW community any more.

There is a website N5tuner but its not secure and there Facebook page doesn't seem that active.

Wonder if anyone could help!

 

[matreyia]

Sorry to re hash an old thread. I am trying to source these and Stett don't seem active in the BMW community any more.

There is a website N5tuner but its not secure and there Facebook page doesn't seem that active.

Wonder if anyone could help!

Call him directly but they do sell them still. Number should be on website.

 

[screaminfast]

Been thinking about making some for my car. Any thoughts about going to one single canister with multiple ports? I have some leftover oval exhaust piping.

 

[matreyia]

Been thinking about making some for my car. Any thoughts about going to one single canister with multiple ports? I have some leftover oval exhaust piping.

You got me. I don't modify already engineered things. I only buy upgraded things that follow factory engineering with better materials so as to increase usage life and operating limits.

 

[screaminfast]

You got me. I don't modify already engineered things. I only buy upgraded things that follow factory engineering with better materials so as to increase usage life and operating limits.

Whipped this up in SolidWorks just now as a thought....

 

[JBacon335]

They both use the same vacuum source and are even T'd together after the solenoids so why not combine the reservoir? It should be fine

 

[screaminfast]

They both use the same vacuum source and are even T'd together after the solenoids so why not combine the reservoir? It should be fine

That's what I figured too. That design is 4" long has has about 31.5in^3 of volume.

 

[matreyia]

They both use the same vacuum source and are even T'd together after the solenoids so why not combine the reservoir? It should be fine

I am not qualified to agree or disagree. Give it a try and see what happens.