Eventuri development

[Eagle7]

Are we confident that the Mass Air Flow sensor scaling will support an increase in airflow? I'd hate to spend a bunch of money on a fancy airbox and find that the ECU can't read anything higher than the "fully open" value pre-programmed to the voltage output of the MAF, and in fact may throw errors on voltages above the "wide open" value in the table.

Eventuri has been doing this for years with other brands of high performance cars. Their reputation is solid and I haven't seen any reports on any of the videos I've watched that there were any issues with ECU management. The thing to look for on the dyno tests will be comparing the stock A/F ratio to what's happening with the other air filters and Eventuri's system.

 

[Eagle7]

You can accomplish that just fine with silicone hoses. For example, I ran this turbo inlet on one of my Subaru STIs with no issues. It's multi layer silicone reinforced by a SS support wire:

View attachment 44712


And here are the silicone boost hoses on my 300ZX twin turbo.. No issues with melting or collapsing, even at 28psi and over 450whp.

View attachment 44713

Yes you can, and that's probably what Eventuri has used. However, as you'll note from the pictures I posted, the angles, twists and short distance from the intake box to the manifold make it impossible to just bend a thick silicone tube to fit, which is why Eventuri went to the trouble to design and fabricate a molded custom piece. It's not just a simple tube bend. However I suspect it's their box and filter design that makes the real difference. We'll see soon enough.

 

[Porter]

Eventuri and another owner have confirmed no codes with its use.

I'm not talking about codes, I'm talking about the ability for the ECU to deliver additional fuel to match the increased volume of air. That's surely what we're talking about here right?

I mean this is a forced induction motor, it's not like a naturally aspirated motor where we are depending on the free flow of air through a plenum under vacuum, and delicate tuning of the flow makes a big difference. This engine has a supercharger, it's cramming air into the intake manifold under pressure and the intake (vacuum) side of that system is mostly about volumetric reserve rather than velocity.

The stock system seems short and quite reasonable in design, to me. Plus the air intake scoop itself on the side of the car is directly pressurized by the motion of the car through the air. If it were a front engine car we'd all be talking about it having "ram air" induction.

I would have to see some clear A/B evidence of an aftermarket intake making a big difference before I personally get on board with it. And that test needs a blower pointed directly into the side scoop if it's a dyno test, otherwise it's not using the aerodynamics of the car to pressurize the intake in the way that the Emira is designed to do.

 

[Porter]

Yes you can, and that's probably what Eventuri has used. However, as you'll note from the pictures I posted, the angles, twists and short distance from the intake box to the manifold make it impossible to just bend a thick silicone tube to fit, which is why Eventuri went to the trouble to design and fabricate a molded custom piece. It's not just a simple tube bend. However I suspect it's their box and filter design that makes the real difference. We'll see soon enough.

FYI they don't bend silicone tubes, they make a form and then spiral wrap the silicone around it to make a shape. That's for low volume production, for high volume stuff they make a mold. But it's never a generic silicone hose that's being bent into shape.

 

[Eagle7]

I'm not talking about codes, I'm talking about the ability for the ECU to deliver additional fuel to match the increased volume of air. That's surely what we're talking about here right?

I mean this is a forced induction motor, it's not like a naturally aspirated motor where we are depending on the free flow of air through a plenum under vacuum, and delicate tuning of the flow makes a big difference. This engine has a supercharger, it's cramming air into the intake manifold under pressure and the intake (vacuum) side of that system is mostly about volumetric reserve rather than velocity.

The stock system seems short and quite reasonable in design, to me. Plus the air intake scoop itself on the side of the car is directly pressurized by the motion of the car through the air. If it were a front engine car we'd all be talking about it having "ram air" induction.

I would have to see some clear A/B evidence of an aftermarket intake making a big difference before I personally get on board with it. And that test needs a blower pointed directly into the side scoop if it's a dyno test, otherwise it's not using the aerodynamics of the car to pressurize the intake in the way that the Emira is designed to do.

The A/F ratio is what I'm going to be looking at with the dyno tests that @GRP does. If the Eventuri delivers at low rpm what their dyno indicated, that shows that the supercharger isn't getting as much air as it can use through the stock filter system. It's not bad, just not ideal. Obviously at higher rpms it needs even more airflow which is where the less restrictive air filters will come into play.

The ability to deliver enough air fast enough is what's going to make the difference. The intake valve is only open for a fraction of a second, so delivery speed is important. The supercharger can only deliver what it can get from the air intake box.

It's like a dozen people trying to get through one door. If they all try to do it at the same time, they bunch up and it slows down people getting through. Pressing them all together from behind isn't going to get them through the door any faster either, the flow pattern has to change. If they form into a single file and work together, they can get through faster. The room hasn't changed, the door hasn't changed, and the number of people haven't changed; what changes is organizing their movement pattern so they can get through the door faster.

The stock air box is 'bunching up' the air into turbulence which is slowing down airflow through the filter. This isn't unique to Lotus; pretty much all factory designed air boxes do this, which is why aftermarket companies are able to slightly improve performance (sometimes) with their intakes. There are usually compromises though compared to stock, typically noise level and often exposure of the filter to the elements by not enclosing it completely like the factory system does. OEM's have gotten much better over the years with their intake systems in order to comply with regulations and emissions requirements, but there's still some room for improvement.

We'll see how the test goes and what the results are. If the Eventuri is the only one that shows improvements immediately, while the less restrictive filter element and whatever other systems GRP tests don't come into play until the upper rpms, that's going to tell the story. In essence, the Eventuri will be directing the airflow into a single-file pattern which will allow more air through faster. Of course the dyno shop is going to have blowers aimed at the intakes, both the engine intake and the radiators so each system tested will have the same conditions. They have to to prevent overheating and blowing things up as well as simulate a vehicle in motion.

 

[Porter]

The A/F ratio is what I'm going to be looking at with the dyno tests that @GRP does. If the Eventuri delivers at low rpm what their dyno indicated, that shows that the supercharger isn't getting as much air as it can use through the stock filter system. It's not bad, just not ideal. Obviously at higher rpms it needs even more airflow which is where the less restrictive air filters will come into play.

The ability to deliver enough air fast enough is what's going to make the difference. The intake valve is only open for a fraction of a second, so delivery speed is important. The supercharger can only deliver what it can get from the air intake box.

It's like a dozen people trying to get through one door. If they all try to do it at the same time, they bunch up and it slows down people getting through. Pressing them all together from behind isn't going to get them through the door any faster either, the flow pattern has to change. If they form into a single file and work together, they can get through faster. The room hasn't changed, the door hasn't changed, and the number of people haven't changed; what changes is organizing their movement pattern so they can get through the door faster.

The stock air box is 'bunching up' the air into turbulence which is slowing down airflow through the filter. This isn't unique to Lotus; pretty much all factory designed air boxes do this, which is why aftermarket companies are able to slightly improve performance (sometimes) with their intakes. There are usually compromises though compared to stock, typically noise level and often exposure of the filter to the elements by not enclosing it completely like the factory system does. OEM's have gotten much better over the years with their intake systems in order to comply with regulations and emissions requirements, but there's still some room for improvement.

We'll see how the test goes and what the results are. If the Eventuri is the only one that shows improvements immediately, while the less restrictive filter element and whatever other systems GRP tests don't come into play until the upper rpms, that's going to tell the story. In essence, the Eventuri will be directing the airflow into a single-file pattern which will allow more air through faster. Of course the dyno shop is going to have blowers aimed at the intakes, both the engine intake and the radiators so each system tested will have the same conditions. They have to to prevent overheating and blowing things up as well as simulate a vehicle in motion.

The air against the back of the intake valve is compressed by the supercharger, it isn't an atmospheric engine. Are you suggesting that the aftermarket intake is going to make the boost pressure go up?

 

[Time2Fly]

The air against the back of the intake valve is compressed by the supercharger, it isn't an atmospheric engine. Are you suggesting that the aftermarket intake is going to make the boost pressure go up?

I think the indication for any of these to work is that the supercharger could be doing better if it was getting more air to start with.

 

[Porter]

I think the indication for any of these to work is that the supercharger could be doing better if it was getting more air to start with.

I mean, that sounds great! But I would definitely like to see independent data before assuming that any product claims are genuine, even from reputable brands.

 

[Eagle7]

The air against the back of the intake valve is compressed by the supercharger, it isn't an atmospheric engine. Are you suggesting that the aftermarket intake is going to make the boost pressure go up?

When the cam pushes the intake valve to open the intake port, the engine is pulling the piston down to draw air into the combustion chamber. The downward movement of the piston creates vacuum to literally suck air into the chamber. The valve however isn't stationary; it's constantly in motion as it 'gradually' (it's very quick actually) opens the port, which allows air to immediately begin to be pulled into the chamber the instant the port starts opening, and once the valve reaches its maximum travel, it immediately begins closing which starts to 'gradually' close the port opening. The window of opportunity for air to flow through the port is short and constantly varying.

There's the possibility of turbulence in the intake port of the heads too. Engine builders take great pains to port and polish the heads to improve the flow speed of air through them to improve combustion and power. The shape of the edge and surface of the valve can create turbulence, which is why dirty valves can lower engine performance. Turbulence creates resistance and that slows down the flow speed or current. It's like water flowing in a creek or stream; if there's turbulence, the current slows down. Air is very fickle when it comes to flow speed. You have to channel it. Look at a tornado; it's channeling air into a vortex which increases the speed and power. If you could create a vortex in the intake to pull air into the engine, and then a vortex in the exhaust to pull the exhaust gases out of the engine, you'd have an engine breathing to perfection, but it's got to do it very fast to be efficient.

Volume is one thing, but speed is important too. There's a very quick and constantly changing opportunity to get air into the chamber, and that's where flow speed matters. Air being able to move faster during that limited opportunity enables more air to make it in there before the door is closed.

Will that increase boost pressure? Yes, slightly. What the Eventuri is doing isn't dramatic or extreme; it's only allowing an increase of anywhere from approximately 10-20 hp at top rpm, but even at lower rpm it's working. What's interesting is that seems to be consistent on all the videos I've seen of other cars using their system. It seems to be finding that extra 2-5% of efficiency that the OEM systems have left on the table.

Hopefully GRP will be able to do this comparison test soon. I can't wait to see the results.

 

[David s]

The A/F ratio is what I'm going to be looking at with the dyno tests that @GRP does. If the Eventuri delivers at low rpm what their dyno indicated, that shows that the supercharger isn't getting as much air as it can use through the stock filter system. It's not bad, just not ideal. Obviously at higher rpms it needs even more airflow which is where the less restrictive air filters will come into play.

The ability to deliver enough air fast enough is what's going to make the difference. The intake valve is only open for a fraction of a second, so delivery speed is important. The supercharger can only deliver what it can get from the air intake box.

It's like a dozen people trying to get through one door. If they all try to do it at the same time, they bunch up and it slows down people getting through. Pressing them all together from behind isn't going to get them through the door any faster either, the flow pattern has to change. If they form into a single file and work together, they can get through faster. The room hasn't changed, the door hasn't changed, and the number of people haven't changed; what changes is organizing their movement pattern so they can get through the door faster.

The stock air box is 'bunching up' the air into turbulence which is slowing down airflow through the filter. This isn't unique to Lotus; pretty much all factory designed air boxes do this, which is why aftermarket companies are able to slightly improve performance (sometimes) with their intakes. There are usually compromises though compared to stock, typically noise level and often exposure of the filter to the elements by not enclosing it completely like the factory system does. OEM's have gotten much better over the years with their intake systems in order to comply with regulations and emissions requirements, but there's still some room for improvement.

We'll see how the test goes and what the results are. If the Eventuri is the only one that shows improvements immediately, while the less restrictive filter element and whatever other systems GRP tests don't come into play until the upper rpms, that's going to tell the story. In essence, the Eventuri will be directing the airflow into a single-file pattern which will allow more air through faster. Of course the dyno shop is going to have blowers aimed at the intakes, both the engine intake and the radiators so each system tested will have the same conditions. They have to to prevent overheating and blowing things up as well as simulate a vehicle in motion.

Love reading your posts, and how you explain things in a simplistic way. Now. Can can you define what is a woman?

 

[Eagle7]

Love reading your posts, and how you explain things in a simplistic way. Now. Can can you define what is a woman?

ROFL well now.... let's see.... from a purely objective viewpoint, they're these strange creatures that want to do odd things like... make decisions, tell men what to do, etc. They like to use the royal "we" when describing things that "we" need to do, but that royal "we" is spelled by the letters of your first name. They fill closets with shoes; some of which they'll only wear once, and some they'll never wear and don't even remember they have. They buy lots of purses, all of which they claim to hate, yet are continually on the lookout to buy another one.

They think they rule the castle and all the lands in the domain, yet call on men immediately if something serious and threatening appears... like a spider or a bug, or you know, God forbid a mouse or something that needs to be destroyed. They have no sense of what the word "steady" means when it comes to room temperature and HVAC controls. They can reproduce our own kind, which is a pretty remarkable thing.

Sometimes they're fun, sometimes they're frustrating. Sometimes they do wonderful things, and sometimes they do things that make no sense whatsoever. Some are high maintenance, some are low maintenance, and some are better avoided altogether. They can be predictably unpredictable. You can't live with them; you can't live without them, but if you find a good one... they're good for a lifetime.

 

[David s]

ROFL well now.... let's see.... from a purely objective viewpoint, they're these strange creatures that want to do odd things like... make decisions, tell men what to do, etc. They like to use the royal "we" when describing things that "we" need to do, but that royal "we" is spelled by the letters of your first name. They fill closets with shoes; some of which they'll only wear once, and some they'll never wear and don't even remember they have. They buy lots of purses, all of which they claim to hate, yet are continually on the lookout to buy another one.

They think they rule the castle and all the lands in the domain, yet call on men immediately if something serious and threatening appears... like a spider or a bug, or you know, God forbid a mouse or something that needs to be destroyed. They have no sense of what the word "steady" means when it comes to room temperature and HVAC controls. They can reproduce our own kind, which is a pretty remarkable thing.

Sometimes they're fun, sometimes they're frustrating. Sometimes they do wonderful things, and sometimes they do things that make no sense whatsoever. Some are high maintenance, some are low maintenance, and some are better avoided altogether. They can be predictably unpredictable. You can't live with them; you can't live without them, but if you find a good one... they're good for a lifetime.

OK. I think I`d prefer to learn more about airflow through my supercharger. Too much reality gives me a sore A hole.

 

[David s]

BTW. Has anyone here upgraded their standard air filter? If so, how did it go?

 

[Golden Parrot]

Installed the EVenturi Kit today. Thanks to Greg for the quick shipping!
Intake noise is obviously louder, engine seems to rev more freely, will take some driving to see if it feels quicker.
Installation is easy and takes about one hour

 

[Eagle7]

Installed the EVenturi Kit today. Thanks to Greg for the quick shipping!
Intake noise is obviously louder, engine seems to rev more freely, will take some driving to see if it feels quicker.
Installation is easy and takes about one hour

Looking forward to your driving impressions.

 

[VL3X]

Installed the EVenturi Kit today. Thanks to Greg for the quick shipping!
Intake noise is obviously louder, engine seems to rev more freely, will take some driving to see if it feels quicker.
Installation is easy and takes about one hour

Let's see some pics!

 

[EZcheezy]

Let's see some pics!

screw pics, I wanna hear some audio!

 

[Golden Parrot]

Let's see some pics!

posted some pics here:

What did you do to your Emira today?

Nice, did you also add a k&n? Nope. haven't seen any compelling data to change an air filter (and probably won't care under warranty). I'm not going to chase HP gains with this car. My wife and I drove about a hundred miles yesterday across the Hudson Valley on some fun roads and I never...

www.emiraforum.com

will try to get some audio clips soon

 

[Blackthought_]

For those who have installed the eventuri intake, how is it!? Any issues? @Golden Parrot anyone else install it as well?

 

[Golden Parrot]

For those who have installed the eventuri intake, how is it!? Any issues? @Golden Parrot anyone else install it as well?

Driven the car a bit now. My impressions are that there is a small but noticeable increase in performance. The car pulls more, especially in lower gears. Induction noise is much louder with the window open (as in it sounds like a turbine next to your ear) but almost same as stock with the window closed.
Overall happy with the results!

edit: Keep in mind my car has the AERIE titanium exhaust with cat delete.