Simota intake

[Sajk]

I have an opportunity to pick one of these up second hand. The filter looks small and I don't know about its quality.

Any thoughts?

 

[GazHyde]

If it's a genuine Simota then it should be fine assuming it's correct for the engine. Is the cone original? Do you know what car it came off?

 

[Sajk]

It's from an M never used. What I don't know is A) is it just going to heat soak B) how much power will it lose over the stock box and C) what the filter efficiency is.

It's for induction noise. That's why I am interested. Do you perhaps know what additional induction noise a drop in high flow panel would add?

 

[Pingu]

A) Yes
B) Measure the temp on the air box. 1% less molecules per cube for every 7 deg C temp increase.
C) Best flow is the standard BMW paper filter. Found by experiment on a flow bench.

 

[Sajk]

As expected... more noise how then?

 

[t-tony]

Basically more noise = less performance. Your choice. Me, I went with the noise option.

View: https://www.youtube.com/watch?v=QjS5-Uv0PoM


Tony.

 

[Pingu]

As expected... more noise how then?

I call it the syringe effect.

If you stick an empty syringe in water and drag it too fast, three main things are observed.

1. It makes a slurping noise
2. The syringe doesn't fill
3. The syringe piston is pulled back when you let go

• The slurping noise is the noise we all like. Good.
• The syringe not filling shows you what happens when a piston tries to draw fluid to quickly through an orifice. The cylinder won't fill. This means there will be a smaller bang. Bad.
• The last one is the real performance killer. In an IC engine, this would have the effect of trying to turn the crankshaft the wrong way. It takes power to make it continue in the correct direction. This power can't now be used to turn the wheels. Very bad.

 

[Sajk]

Basically more noise = less performance. Your choice. Me, I went with the noise option.

View: https://www.youtube.com/watch?v=QjS5-Uv0PoM


Tony.

What intake is that?

 

[Sajk]

I call it the syringe effect.

If you stick an empty syringe in water and drag it too fast, three main things are observed.

1. It makes a slurping noise
2. The syringe doesn't fill
3. The syringe piston is pulled back when you let go

• The slurping noise is the noise we all like. Good.
• The syringe not filling shows you what happens when a piston tries to draw fluid to quickly through an orifice. The cylinder won't fill. This means there will be a smaller bang. Bad.
• The last one is the real performance killer. In an IC engine, this would have the effect of trying to turn the crankshaft the wrong way. It takes power to make it continue in the correct direction. This power can't now be used to turn the wheels. Very bad.

Would that effect only happen if the intake could not meet flow demands or are you saying that the pressurized air box model used by bmw is what negates it.

 

[t-tony]

What intake is that?

This is what I used Sajk.

https://zroadster.org/attachments/024-3-jpg.50007/

Tony.

 

[Sajk]

I have one of those. Maybe i will put it on and see how it sounds. No heat shield though?

 

[t-tony]

I have one of those. Maybe i will put it on and see how it sounds. No heat shield though?
[/QUOT

I made one.

Tony.

 

[Sajk]

How are your intake temps?

 

[t-tony]

If you look through that progress thread I did do some tests and listed them on my thread.

Tony.

 

[Sajk]

Just read the e89 thread. Is the intake in the e85 thread or did I miss it?
Edit.
Found.

 

[Pingu]

Would that effect only happen if the intake could not meet flow demands or are you saying that the pressurized air box model used by bmw is what negates it.

Yes, but any reduced flow rate sounds more "throaty".

You can measure the flow rates through the MAF and see if "after" is better than "before". Use the same test track and Testo, or you could use a recordable voltmeter that is connected to the MAF's output wires.

You could use a rig similar to this, but it won't account for any heat soak

This shows the difference that heat shielding your plenum, MAF and air filter from the engine can do.

This is my Testo video to show what you can do with it. 11:45 shows the syringe effect. This was with a standard air filter.

 

[Sajk]

I will put this in the wanted section but Tony or anyone else who reads this thread do you happen to have an e85 M airbox hanging around?