There are a few different......>> Opinions on this but the main two are..Remove it and it will improve airflow as the mesh is a restriction you dont need.Don't remove it as the mesh in front of the the element is required to break up the flow and give a "true" reading to the meter.This subject has been debated at length several times with people posting data from dynos to back up one side or the other. Dry doing searches using terms like "MAF", "screen", and "screen and removal".
I have heard.... That you should leave the front screen so the meter gets a "true" signal, but remove the mesh after the meter. How much gains you'll get is debateable, but at least the sensor will get a proper signal and also allow more air to flow through after the sensor.
WYKKED, JEDI-77 reading your car specs you guys have done a lot of mods, have you guys removed your mesh in your a/f meters:?)Did a search last night and WYKKED are you still runnning two front side mount intercoolers:?) and are they still doing the job for you :?) :-Z
Unless you've stumbled onto some new> science/technology, I don't know where this "more air after the sensor" is going to come from Mark.:s I know what your getting at, but with the front mesh restricting the flow the "damage" is already done Perhaps the answer is to run two AFM's (double the airflow) or as UAS have suggested, a Microtech or similar, which removes the need for an AFM altogether.Cheers mate Lloyd :-Z
I disagree somewhat >> Having one mesh screen for the air to flow through will allow a certain flow rate. Adding more and more mesh screens would decrease the flow rate at an exponentially decreasing rate as more mesh screens were added. The mesh screens present a pressure drop and by removing any of them would reduce the pressure drop caused by the mesh screens and increase the flow rate. I think the screens are there for 1) to protect the sensor from being damaged either by mishandling or sucking up wombats into the intake. 2) to increase the accurracy of the sensor by breaking the venturi effect caused by the turbos.By removing the screens the sensor might be reading less air mass than what is actually being fed into the engine and hence leaning the mixture out and giving gains through that. I'm sure it doesn't really matter if they are there or not, just as long as it's not doing any damage and I've heard of no bad stories with the mesh screens removed.
Not sure chilli..... but my brain tells me that you'll get easier flow of air through 1 mesh, rather than 2. But I guess that since the 2nd mesh is after the sensor, it doesnt really do much. I'm not sure...Cheers
No you don't, I agree with what you> are saying(more screens, more restricted flow). I just don't understand how airflow can be increased beyond the rate already determined by the restriction of the remaining screen.(surely, to increase the airflow, you would have to reduce the restriction). I'm quite prepared to be shown otherwise, mate.:YD Cheers Lloyd :-Z P.S. I think Wombat ingestion is an entirely different science.
side mounts some ppl like front mounts and others have just increased the size of their side mounts. its just upto personal preference... i have bigger sidemounts and belelieve it does just as good as job as a front mount however alows more flow to the radiator, i think Wykked has lager side mounts on his beast and feels its sufficient. others may say differ... Cheers,Red Z.
Wykked definitely runs larger sidemounts >>> don't know what brand as they are not in his profile. However, I couldn't let "lager sidemounts" go through to the keeper : - Do they have a foaming problem? - Does brand of lager make a difference? - Does full strength give more kW than light? - There could be some sponsorship opportunities Pete hasn't tapped yet! - How do lager sidemounts work? Is the intake air run through chilled beer before hitting the throttle bodies? - If Poms like warm beer, does this mean lager sidemounts wouldn't be as effective in UK? Hehehehe, sorry to take the piss, couldn't help meself =) =) =). Now back to the fridge :YD. By the way, I still have the standard IC's, when I update it will definitely be to larger sidemounts of 1 brand or another, I agree with your thinking. Cheers, Mikey.
has to increase air flow capability !! c'mon fellas, I think this is simple physics here.A screen would cause a pressure drop at a certain amount of air flow. Adding a second screen would increase that pressure drop, resulting in reduced flow through the pair, and thus a reduction in hp of the engine.If you have one screen, then you have a restriction, a second screen is an additional restirction, even if it was a higher flowing (ie, more open mesh) than the first screen simply becuase the air will become turbulent as it passes the screen, which causes friction, which reduces flow.Think of it another way, if you sqeeze 100 screens in the induction pipe, it cant flow as well as a pipe with only 1 screen, which cant flow as well as a pipe with no screens.But, as people have mentioned, the screen may be there to striaghten air flow, but I have only seen a photo of this mesh, and thats what it is, a mesh. Its not designed to straighten air flow as are some of the screens fitted to different brand air flow meters. It appears to be there to simply stop large objects destroying the internals of the AFM.I will be pulling mine out as soon as I put on the pod filter.Ben
funny that this has just been brought up... again. Was just reading a thread on this site all about this issue yesterday (came up on a search for an unrelated matter). I'll see if I can dig it up again.... here it isFacts & Fallacies (Caution technical, causes headache) anyhoo, I can't really see how it will effect the reading of the AFM. Since the wire is effectively one dimensional in the plane of the flow direction, there will be no change in the rate of particles attempting to pass through it, regardless of the whether the flow is laminer or turbuent (assuming that the mean velocity is the same). Therefore, removing the wire mesh (which will probably result in a more laminer flow), should not change the accuracy of the reading.I pretty sure its just there to stop stray fingers causing damage. Therefore, removal will result in greater airflow, and increased happiness.
I wouldn't imagine so but even on a turbo car it just changes the range of voltage readings e.g.with mesh screens the afm might read 0.1V or idle air flow and 4.5V for air flow at 7500rpmwithout the mess screebs the afm might read 0.3V for idle air flow and 4.7V for air flow at 7500rpmso when the car is self learning the fuel map correction value it will compensate for this change in sensor voltage readings.
I totally agree They are there for fingers. I should also point out that I have not noticed any difference in performance or driveability by removing the screens. If there is a benefit to be had its probably very very small, but every little bit counts I guess =)I haven't got a clue when it comes to physics and the chemistry of molecules etc, if the screens were really there to increase turbulence, wouldn't it be enough that the air has to pass through the restrictions of air filter, plus the fact that air would be comming in from all directions through the filter, not to mention that air molecules have to navigate through or around the AFM right in the middle of the its path???
Now think of it like this......>> Air doesn't flow through the MAF but is drawn through it. Does this make the inner or outer screen the primary or secondary restriction? I'm no rocket scientist so this going to be a very rough example with absolutely no credibility in the figures as I'll be using ones I can easily work with.Say an engine requires a flow rate of 100cfm, and each screen has an effect of reducing airflow by 50%. On the engine side of the MAF is 100cfm, but the screen on the engine side of the MAF cuts that flow by 50% so does it slow the air down? Yes, because we have a constant inside the engine, so that would mean that there needs to be 200cfm in the MAF so that after the 50% restriction we will still have our required 100cfm. Add to that the front screen which also has a 50% restriction and you can see why I believe that removing the rear screen could be of benefit. I still have the front screen in my car and will keep it until someone can provide hard proof that removing it has no effect on the movement of air through the MAF and over the element.Well, those are my thoughts on it so now I'm going to sit back and let all the rest of you specialists, particle physists, and rocket scientists tell me where I'm going wrong.
