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      11-29-2011, 12:25 PM   #1
Sal@Evolve
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Evolve E-Tronic Valve Performance Exhaust Development

Evolve E-Tronic ĎPerformanceí Valve Exhaust Ė BMW E90 / E92 / E93 M3




It's always hard to make an exhaust system which pleases everyone. Some like them loud, some not so. Even in our own case as enthusiasts we understand that there is no perfect exhaust system when it comes to sound level and noise.
Exhaust note and sound level is something that is always a compromise on a fixed system. Sometimes you feel you itís not loud enough and other times too loud depending on what you have purchased.
To have both in one package is the ultimate solution so you can choose.

Creating a well engineered product is not so simple especially when you have so many variables such as back pressure, power output, sound volume and sound type in the equation.
We have seen numerous times where the current systems lose power on the quiet setting with an acceptable sound level and then do not lose power on the louder setting but are simply too loud.
We have gone as far as possible in our development and testing process for both power outputs, sound type and sound level.

Our Objectives:

Sound:

- Noise level and type to be sporty, smooth and sophisticated with the valve closed
- Minimal or zero drone with valve closed
- Valve open noise to be epic without being too loud and something you can actually enjoy without being embarrassed.
- Valve open noise to have a great pitch
- The difference between the valves open and closed not to just be a difference in sound level but also sound type (very adventures from a design point)

Engine Power Output:

- Power output not to change with the valve open or closed (This is not easy!)
- Dyno Testing as part of the development process
- Back Pressure testing as part of the development process

Installation / Servicing:

- Easy of installation of the physical exhaust
- Easy installation of the electronics which control the valve position
- Valve operation to be electronic with a keyfob
- Valve assembly to be easily removed in case of failure (will come with a lifetime warranty)
- A good range of high quality tail pipes
- Tail pipes to be individual and adjustable so individual stagger or length can be setup depending on individual taste and/or rear diffuser type

The Development:

The most difficult aspect of the development was to keep the power output of the S65 engine the same with the valves open or closed. For the evolve team it was unacceptable to lose any power when the valve is closed. It is very easy to make a valve based system where the back pressure dramatically increases with the valve closed. The most common method of creating a valve system is to put the valve on the end of one of the tail pipes on a regular fixed exhaust system.
When this is done the cross sectional area of the perforated section reduces and creates a huge amount of back pressure. This is wrong.

The Evolve E-Tronic uses two completely different paths when the valve is open or closed. We calculate and test different lengths and cross sectional areas of perforated tubes which take different paths.

So how do we start the process?

The first step is to fit pressure sensors across the entire stock BMW system. We fitted pressure sensors after the primary CAT, after the secondary CAT and just before the rear exhaust.
We take a measurement at different RPMís and then during a dyno test.
A completely free flow system is then fitted without CATís and a straight through rear silencer. Pressure testing is done again.
Of course, we all know the results on the dyno of such a change and itís around +20-30hp / 30lb.ft torque.
The aim is then to achieve the same power output but with a system with secondary CATís, mid silencers and a rear exhaust with two different paths for the exhaust gasses to exit (valve).

Alot of time is taken at this stage to achieve the goal.

Once this is achieved then comes a part which is in some ways even more difficult and time consuming Ė the noise type and pitch with both the valves open and closed while maintaining a zero power loss of the fully optimised system. The worst part is where we to make the valve rear silencer sound great with and without a primary DECAT and X Pipe!
Before we even started this process we spoke to many people and what they think is the best noise level and what they want the exhaust to sound like.

We already had alot of previous experience with the evolve X Pipe and fixed rear exhaust which sounded totally unique. Maybe a little too unique for the wider audience.


Our Prototype:












Dyno Testing:

Independant Maha LPS 3000 measuring
- wheel power (Radleistung)
- run down losses (Schleppleistung)
- calculated flywheel power (SAE corrected (Norm-Leistung) and uncorrected (Motorleistung))
- pressure sensors along exhaust (1,2,3)
- ignition timing (Zundung)
- Lambda (OBD)
- Inlet air temperature (T Ansaugluft Deg C)

Note Ė Pressure sensors are placed before the secondary CAT, Before the X Pipe and before the rear exhaust

Fuel Ė 100 Octane (Euro)
Engine Management Ė Stock BMW

1) Stock Rear Exhaust, Evolve X Pipe with 200CPi CATís, Resonators vs AA catless X-Pipe
This dyno test is done to show the difference 200CPi CATís make. Basically very very little!



2) Evolve E-Tronic Rear Exhaust + Evolve X Pipe with 200CPi CATís, Resonators
Valves open vs valves closed


Dyno Data of Valves Open with Evolve X Pipe



Dyno Data with pressure tests with Valves Open and Evolve X Pipe



Dyno Data of Valves Closed with Evolve X Pipe



Dyno Data with pressure tests with Valves Closed and Evolve X Pipe



3) Evolve E-Tronic Rear Exhaust + Factory X Pipe
Valves open vs valves closed




Dyno Data of Valves Open



Dyno Data with pressure tests with Valves Open



Dyno Data of Valves Closed



Dyno Data with pressure tests with Valves Closed




Analysis of results:

1) Evolve E-Tronic Rear Exhaust + Evolve X Pipe with 200CPi CATís, Resonators

The results clearly show there is no real measureable difference in engine power output with the valves open or closed.
The pressure tests show a small increase in back pressure but this is not enough to make any real difference in engine power output. An approximate average increase of 0.10 Bar is seen through the exhaust system.

2) Evolve E-Tronic Rear Exhaust + Factory X Pipe

The results clearly show there is no real measureable difference in engine power output with the valves open or closed.
The pressure tests show a small different in back pressure but this is not enough to make any real difference in engine power output. An approximate average increase of 0.15 Bar is seen through the exhaust system.

Additionally, you can also see an average difference in pressure drop of approximate average of 0.5 Bar before the secondary CATís by deleting the primary CATís. This is why the power increase is so vast from a primary decat. Not just because of such a larger pressure drop but one that is so close to the engine.

The main result is that we do not lose power with our valve exhaust on the quiet setting. To lose power the back pressure increase towards the rear end of the car needs to be very large.

3) The dyno results show that our full system performs to the same level as any other X-Pipe/CAT/Rear Exhaust Setups with both valves open or closed.


Images of pressure sensors locations:








Additional information for readers to analyse results

As you can see from the dyno data every run has information about ignition timing and lambda.
We have shown what the stock ignition and lambda targets from the factory software below so you can have a better understanding of whatís going on.
Please note these are Ďtargetsí and the actual end result has the effects of many variables.



We hope the above information serves to be useful to the readers and shows the extent we go to when developing a product.

Videos and images of tail pipes to follow.


Prices:

1) Rear Exhaust with Valves and Contoller with either tail pipe design - $3500
(Includes connecting pipes to mate to stock X-Pipe)

2) X Pipe with 200CPi High Flow CAT's + Resonators - $2750

3) Full System - $6000

Our valve system will fit any of the X Pipes on the market which mates to a stock rear silencer.

I hope the prices seem reasonable. Given the competing products we are offering quite alot for the money when you consider valves, the highest quality tail pipes, proper engineering, high flow CAT's and resonators in the X Pipe.

Last edited by Sal@Evolve; 11-30-2011 at 12:38 PM.
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      11-29-2011, 12:27 PM   #2
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Looks great! Lot of actual R&D...I like.
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      11-29-2011, 12:29 PM   #3
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So, after you have digested the first post we can move onto some more important things.

There will be better quality images to come.

The initial adjustable tail pipes we will be offering are:

1) 4 x 90mm Thin Rolled 20 Degree Angle Slash Cut Chromed (pictures show non chromed)

2) 4 x 90mm 2.5mm Straight Cut Chromed

We chose the 2.5mm staight cut because it is more visible from the rear.

Images:

4 x 90mm Thin Rolled 20 Degree Angle Slash Cut





4 x 90mm 2.5mm Straight Cut Chromed






Videos (more to come soon):

Please note that the street mode is going to have an adjustment to make it quieter for the final production. The race setting will not change.






Last edited by Sal@Evolve; 11-29-2011 at 12:52 PM.
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      11-29-2011, 12:52 PM   #4
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Looking good. Can't wait to hear it
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      11-29-2011, 01:00 PM   #5
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ive been waiting for you guys to come up this setup! Im pumped!
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      11-29-2011, 01:01 PM   #6
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really nice I have some questions for you

1. Does it drone when its open and close valve?

2. What's the weight?
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      11-29-2011, 01:02 PM   #7
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Quote:
Originally Posted by mkPOTO View Post
ive been waiting for you guys to come up this setup! Im pumped!
Do it
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      11-29-2011, 01:04 PM   #8
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Sounds good!
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      11-29-2011, 01:16 PM   #9
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Quote:
Originally Posted by LV-E92M3 View Post
really nice I have some questions for you

1. Does it drone when its open and close valve?

2. What's the weight?
Hi,

The weight is around the same as the stock exhaust and many of the other stainless steel exhausts (Remus, Eisenmann).

There is no real drone in the quiet setting.

There is drone on the louder setting under 3000 rpm on partial load. Above... none.

The development car with this exhaust has been driven on the Autobahns already at different rpm's constantly. We wanted to see legally what the sound would be like for long crusing at 4000-6000rpm in 7th gear (not legal in the UK to do those speeds!). There was minimal on either setting.

Get on the power and the louder setting really does sound amazing.
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      11-29-2011, 01:18 PM   #10
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Awesome set up guys! Will be contacting you about this exhaust.
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      11-29-2011, 01:18 PM   #11
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Quote:
Originally Posted by Sal@Evolve View Post
Hi,

The weight is around the same as the stock exhaust and many of the other stainless steel exhausts (Remus, Eisenmann).

There is no real drone in the quiet setting.

There is drone on the louder setting under 3000 rpm on partial load. Above... none.

The development car with this exhaust has been driven on the Autobahns already at different rpm's constantly. We wanted to see legally what the sound would be like for long crusing at 4000-6000rpm in 7th gear (not legal in the UK to do those speeds!). There was minimal on either setting.

Get on the power and the louder setting really does sound amazing.
great to hear sal,
when do you think you will have finalize cost for this badboy?
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      11-29-2011, 01:32 PM   #12
Sal@Evolve
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Quote:
Originally Posted by mkPOTO View Post
great to hear sal,
when do you think you will have finalize cost for this badboy?
Probably in the next week or so.

It will be very reasonable given the quality of all of the components from the internals of the silencers to the tail pipes and what people have been paying for other products which are also valve based but do not do what this does.

Also, given that it is the only valve exhaust with so much R&D to prove the power does not fall away.

It will also be at the very top end of of the full exhausts in terms of increasing ultimate power output through the rpm range without the nasty <3000rpm power dip of the majority of exhausts.

To summarise this is a very very unique product which has all of YOUR wishes answered.

Small things like adjustable tail pipes make a big difference because as soon as you fit a rear diffuser most tail pipes will not longer be visible.

Even the valves themselves are removable in case of failure. So you don't have to get a complete replacement but just take 15 mins to change them over without even removing the exhaust.

We are also making the whole system very modular with many different parts. So a system can really be customised.
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      11-29-2011, 01:38 PM   #13
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very nice sal! very pumped!
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      11-29-2011, 01:42 PM   #14
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whoa, sweeeet, sounds n looks awesome.
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      11-29-2011, 01:44 PM   #15
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whoa, sweeeet, sounds n looks awesome.
yes, totally standard BMW Factory calibration.

Well... not anymore
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      11-29-2011, 01:50 PM   #16
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hahah, i figured u would've mentioned it already

any runs w/ evolve tune?
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      11-29-2011, 02:17 PM   #17
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Could you be more specific on the weight? Many aftermarket rear sections are significantly lighter than the oem pancake !
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      11-29-2011, 02:25 PM   #18
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Quote:
Originally Posted by 1SICKM View Post
Could you be more specific on the weight? Many aftermarket rear sections are significantly lighter than the oem pancake !
Hi,

many systems are not actually lighter at all.

We weighed many of the more popular ones and the ONLY one that is actually really lighter is the Akra.

This includes connecting pipes in most cases. Some are actually heavier once connecting pipes are put into the equation! I will not mention which ones these are but they are very popular.

Ours is around the same as stock. You have to expect this from a proper valve system which works and doesn't lose power.

Or we can make one that's significantly lighter but just doesn't work.

Other option is to use really thin matierials but you get sound radiation which doesn't help with drone.

Your real world performance just won't be made much better with losing 5 kg unfortunately. That's the difference between one person and another in most cases.

The biggest weight loss from a full system is 23kg which is the Akra and even then it doesn't really help on a car that weighs over 1.5 tonnes.
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      11-29-2011, 02:27 PM   #19
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Quote:
Originally Posted by the infamous... View Post
hahah, i figured u would've mentioned it already

any runs w/ evolve tune?
No not yet. That will come later.

We are trying to show the product as a standalone and not mix with other products.
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      11-29-2011, 02:35 PM   #20
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Sal,

Thank you. Could you pm pricing when available
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      11-29-2011, 02:38 PM   #21
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Quote:
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Sal,

Thank you. Could you pm pricing when available
No worries.

Just noticed you are SC'd. Weight is of no significance really to you with that sort of power!
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      11-29-2011, 02:39 PM   #22
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No comments about the huge amount of dyno test and technical data on all of the pressure sensor tests!!

Cumon' guys... don't dissapoint me now!
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