Simota Intake will be available in August

[pilchardthecat]

Exdos - have you plotted static pressure vs speed/rpm in the factory airbox?

(i dont care which side of the filter - of all the things that cause a pressure drop the filter is probably the smallest one)

 

[ChawenHalo]

Gruppe M sounds great, looks good and there is no drop in power that I can notice. Would be nice to get to the bottom of it though.

I replaced the left hand front brake intake last year as it popped out on a high speed run and did figure that those bloked off panels direct air behind the bumper and towards the air intake, and though it wa an odd way (if descreet and esthetic) of doing it.

Don't understand how it created a RAM AIR effect though. THe real rm air stiff I've seen on race bykes pretty much go directly to the filter. :?

 

[exdos]

Exdos - have you plotted static pressure vs speed/rpm in the factory airbox?

(i dont care which side of the filter - of all the things that cause a pressure drop the filter is probably the smallest one)

I've not plotted this as a graph, as such, but I have recorded it as a video with the combined use of my datalogger and a Magnehelic pressure gauge and you can see what happens here: http://youtu.be/RzyV4g9KK7M In this recording, my Z4MC was completely OEM.

The graph below is the theoretical increase in static pressure versus velocity: i.e. "ram pressure". As you can see, the pressure inside the air intake (as recorded by the Magnehelic gauge) is varaiable at any given speed dependent upon gear ratio, vehicle speed and throttle opening. As my video shows, the OEM kit is very good to start with but it still can be improved some more.

 

[exdos]

Don't understand how it created a RAM AIR effect though. THe real rm air stiff I've seen on race bykes pretty much go directly to the filter. :?

Movement through air creates drag by creating ram pressure. If you can "feed" the engine some of that air under ram pressure you also increase engine power which partially assists in overcoming the effects of drag. Simples!

 

[pilchardthecat]

Exdos - have you plotted static pressure vs speed/rpm in the factory airbox?

(i dont care which side of the filter - of all the things that cause a pressure drop the filter is probably the smallest one)

I've not plotted this as a graph, as such, but I have recorded it as a video with the combined use of my datalogger and a Magnehelic pressure gauge and you can see what happens here: http://youtu.be/RzyV4g9KK7M In this recording, my Z4MC was completely OEM.

The graph below is the theoretical increase in static pressure versus velocity: i.e. "ram pressure". As you can see, the pressure inside the air intake (as recorded by the Magnehelic gauge) is varaiable at any given speed dependent upon gear ratio, vehicle speed and throttle opening. As my video shows, the OEM kit is very good to start with but it still can be improved some more.

Thanks - Where was the gauge sited exactly?

 

[exdos]

Thanks - Where was the gauge sited exactly?

The Magnehelic gauge uses two pilot tubes which you can see coming out of the device on the left. One pipe, was fed out through the passenger window (which was closed except for a half inch gap at the top) and then passed below the windscreen under the bonnet and then back through the air-intake inlet where the end was left inside the air-filter box just in front of the filter, and the other tube remained inside the car to act as the ambient reference.

Magnehelic gauges are excellent and very accurate. You can pick them up on ebay for next to nothing: mine cost a fiver. They're also great for working out aerodynamics. Here, grab a bargain: http://www.ebay.co.uk/itm/magneheli...LH_DefaultDomain_3&hash=item3f1f67f25f&_uhb=1

 

[GroundEffect]

So I've read the last few pages and I'm still not sure what to make of it.

*Does this system function with the MAF?
*Does it restrict the airflow?
*Has anyone actually dyno'd one yet against OEM or GruppeM?
*Where to source in UK?
*Is it worth spending the extra once GruppeM?

 

[mmm-five]

So I've read the last few pages and I'm still not sure what to make of it.
*Does this system function with the MAF?

Yes

*Does it restrict the airflow?

According to the figures from Exdos it does

*Has anyone actually dyno'd one yet against OEM or GruppeM?

No, but I've bought it for noise/looks rather than power (as I would the GruppeM) - so less than half the price of the GruppeM seemed reasonable

*Where to source in UK?

Sanspeed

*Is it worth spending the extra once GruppeM?

Not IMHO

 

[exdos]

*Does it restrict the airflow?

According to the figures from Exdos it does

*Has anyone actually dyno'd one yet against OEM or GruppeM?

No, but I've bought it for noise/looks rather than power (as I would the GruppeM) - so less than half the price of the GruppeM seemed reasonable

Mmm-five, If you'd like to get to the bottom of this, you could datalog your Z4MC with your Traqmate software, and I'd be happy to produce the graphs of Volumetric Efficiency for you. If you're interested, I'll tell you which parameters you need to log.

 

[mmm-five]

Mmm-five, If you'd like to get to the bottom of this, you could datalog your Z4MC with your Traqmate software, and I'd be happy to produce the graphs of Volumetric Efficiency for you. If you're interested, I'll tell you which parameters you need to log.

No need, I'm perfectly comfortable with just increased/balanced noise front & rear

I was just pointing out that I'd not measured/calculated the sizes of the older housing to compare it with the Simota, and that you had

Don't have a Traqmate either - just got Harry's LapTimer app for the iPhone/iPad.

 

[exdos]

Fair enough.

 

[pilchardthecat]

My current project will retain the stock induction system but increase induction noise, amongst other things. I will start a thread in a couple of weeks. Best of both worlds.

 

[Shooter]

My current project will retain the stock induction system but increase induction noise, amongst other things. I will start a thread in a couple of weeks. Best of both worlds.

I'll be watching you... :evil:

 

[BMWZ4MC]

Although having had the OEM system in bits now i believe i have worked it out

So there are now 2 of us who claim that performance gains are possible!

I say three Although I have now reverted to an aFe "cold" air intake with an RPI scoop as I like more noise

 

[pilchardthecat]

I have the noise thing figured out too.

 

[pvr]

So .. did you fit this one mmm-five?

 

[mmm-five]

So .. did you fit this one mmm-five?

Not got round to fitting it yet as had other things going on - including the possibility of selling/trading to fund a CSL purchase - so left it off until I know the sale is off, which is looking likely as the guy interested has gone quiet.

Now there's a misting of oil in the gearbox (very light and is only coating the underside of the 'box) that the dealer is going to look at during it's final BMW inspection (specialist from then on), as the warranty expires at the end of the month so want it in tip-top condition in case the sale comes to fruition or I evev if I simply keep the car.

Both of those items have made me think twice about putting it on yet, as I don't want there to be even the slightest chance the dealer doesn't want to fix it due to being 'modified' - and this way I'll get a new air filter out of them (which I should considering it's included in the I2 price).

I'll endeavour to get it fitted and recorded before New Year.

 

[ChawenHalo]

Any pics of the kit please?

 

[sam1832]

Your taking your time with this ... lol

Sent from my GT-I9300 using Tapatalk 2

 

[mmm-five]

Your taking your time with this ... lol

Don't usually rush to fit things anyway - to buy yes, but not to fit! But usually I've got other things that get in the way and I simply move the unimportant things aside for a while, and then occasionally forget about them for a couple of months