Hi all,
Anyone here fogged an air box?
Anyone here fogged an air box?
Fogged Airbox
- Thread starter ZTec
- Start date
I have been looking into air boxes lately. The 2.2 and 3.0 L Z3's have a different air box to the other Z3's and a better designed scoop to collect cold air from around the head light area. If it can supply sufficient cold air to the 3.0 L Z3, then it should be an improvement to Z3's with smaller engines.
Still looking for a late model Z3 being parted out locally to get the parts to try it.
Still looking for a late model Z3 being parted out locally to get the parts to try it.
@Antm72 has this airbox on his 2,8
The headlight housing on my 2.8 also has a scoop which directs air towards the air filter. Not massive but certainly some improvement over standard I would have thought.
I suggest that it is worth fogging the box on a 3.0 The reason I say that is I did an experiment using TESTO and air temps. On the same day, same track, almost identical situation [and moving quickly] I got the following results which I conclude means not a whole lot of air is making its way from the outside to the engine bay to the air intake. Not 100% proof but it leans that way. Here it is:
- Ambient air temp is 13 C
- With the fan on the intake is consistently 21 C
- Took fan off and the consistent intake temp went to 40 C.
- the fan is critical in forcing air over the engine [pulling air in actually]
- There isn't a lot free flowing air across the engine through the standard setup
My 2.8 has intake it wraps around the rear of the light and forces the air out in only one direction.
if you run torque app you can monitor intake air temp.... in real time... its surprising how much the intake air temp goes up when standing stationary, or when the car is left parked up i have see intake air rise to abour 30 degrees when in the sun and stationary in traffic.... normally about 15 degrees dependant on outside temp of course....
Just put a massive cone filter on
My car made 205.8 bhp and sounds awesome.
My car made 205.8 bhp and sounds awesome.
what was the dyno result before the cone filter...?
TESTO does that as well as logs information for importing into a spreadsheet. I have semi permanently installed a cable from my under bonnet access point which runs into the cabin and sits under the mat. At any time I can hook up the computer and do the magic! I will certainly run a before and after test when going the fog box.
i have mine permanently hooked up to a bluetooth obd reader and run a switched live to the obd so it turns off when the ignition is off... works great have an old android phone atached to a windcreen mount and usb cigarette lighter charger..,,,
i not tried the testo app i have to have a look for that...
i not tried the testo app i have to have a look for that...
No idea didn't test is as I don't intend to run a standard airbox
Well i though I’d make a start on it today by seeing what I would need to carry out the mod. First impression were it would be a lot easier to blank off the original inlet to the air box and make a new inlet at the front, by doing that the new inlet would be directly in line with the gap to the left of the headlight, (see photos). The number of bends in the new pipe work would be reduced to zero and the length of ducting would be minimal (a few inches at most) and it would point directly forward giving more of a ram air effect. With the original inlet used it is directly behind the radiator expansion tank unless ducted down to behind the fog lights which would be closer to the ground obviously and any water on the roads.
What are your thoughts?
What are your thoughts?
watching with interest
Interested. I wouldn't blank of the other inlet though. Why not keep out open as possible?
- Joined
- Dec 8, 2011
- Points
- 165
I know that you haven't done this, but beware that...
Scooping air directly into the cylinders is not a good thing as it weakens the mixture the faster you go.
You must ensure that scooped air is filtered and is collected in as large a plenum as possible. Beware if you are scooping air into a plenum that is too small, as this may produce a positive pressure in the plenum. This will lead to a false reading on the MAF and possible fueling problems, as there would be the wrong airflow through the MAF compared to engine air consumption.
The main advantage of the "fogged airbox" is the ability to feed the engine with cool air - it is not to scoop the air.
The scoop behind the headlight on mine directs air onto a cone filter, not sure on how it was set up with the standard air box as I took it off and can't remember. I probably should have called it a feed as it just directs air through the front of the car into the engine bay. I don't think it has any effect on performance surely this will only improve it directing air into the area of the cone filter?
Would be nigh on impossible to create a ram air effect on these cars
Basically, do what you want to the inlet, it's all tiny little changes that have little or no affect on the performance.
All about the noise of it
Basically, do what you want to the inlet, it's all tiny little changes that have little or no affect on the performance.
All about the noise of it