De screened MAF

[billyhas]

De screened the maf housing on my LCR at the weekend with good results.I took out all the restriction from an old housing and fitted a good sensor.Before this mod the highest g/s reading was 212 but now that has increased to 216 .Heres the log;

Sunday	14	February	2010	19:19:37							Monday
1ML 906 032 		1.8l R4/5VT         0001									1ML 906 033
											
	Group A:	'003				Group B:	'115				
		RPM	Mass Flow	Load	Ign. Timing		RPM	Load	Absolute Pres.	Absolute Pres.	
	TIME					TIME					
Marker	STAMP	 /min	 g/s	 %	 °BTDC	STAMP	 /min	 %	 mbar	 mbar	Marker
	0	2040	50.06	100	14.3	0.32	2120	124.8	1840	1460	
	0.62	2200	63.89	100	11.3	0.92	2280	146.6	1950	1710	
	1.23	2400	81.11	100	4.5	1.52	2480	175.2	2150	2070	
	1.83	2560	110.33	100	3	2.13	2680	191.7	2210	2310	
	2.43	2800	106.56	100	3.8	2.74	2960	191.7	2240	2270	
	3.03	3080	110.58	100	6.8	3.34	3160	191.7	2280	2220	
	3.64	3320	133.31	100	7.5	3.94	3440	191.7	2330	2280	
	4.24	3520	139.83	100	9.8	4.55	3680	191.7	2370	2310	
	4.84	3800	153.56	100	9.8	5.15	3920	191.7	2400	2340	
	5.45	4040	160.33	100	10.5	5.75	4160	191.7	2410	2390	
	6.06	4280	177.08	100	11.3	6.36	4400	191.7	2380	2480	
	6.66	4520	182.33	100	12.8	6.96	4640	191.7	2380	2440	
	7.68	4920	191.58	100	10.5	7.97	5040	191.7	2360	2400	
	8.27	5120	203.5	100	9.8	8.57	5240	191.7	2340	2360	
	8.87	5320	207.61	100	9.8	9.17	5440	191.7	2320	2320	
	9.47	5520	206.92	100	9.8	9.78	5600	191.7	2300	2270	
	10.08	5680	211.25	100	10.5	10.38	5760	191.7	2270	2230	
	10.68	5880	213.28	100	12	10.98	5920	182.7	2260	2280	
	11.29	6000	211.25	100	11.3	11.59	6080	180.5	2230	2250	
	11.89	6160	216.36	99.6	12.8	12.19	6240	179.7	2220	2200	
	12.49	6280	215.64	100	12.8	12.79	6360	178.9	2200	2210

 

[leon cupra r]

forgive me if I'm being a donut, but do you mean getting rid of the plastic 'mesh' between the sensor + the airbox / induction kit?

 

[billyhas]

There's a plastic mesh on either side of the maf housing and a metal mesh inside.I took all of them out

 

[leon cupra r]

Ah right cool, not a bad increase for somethin that simple then! can you notice a change when driving at all?

 

[D.K]

Did you get any pictures of what you did ?

 

[rsmith]

This screen is there to straighten the airflow so the MAF can get an accurate reading, i actually talked to a company that remaps and they told me to avoid doing this.

Its still up for debate though

 

[billyhas]

No pics but really easy to do. Unplug maf,undo jubilee clips,remove maf from car,remove sensor using 5 sided security torx bit(ts25).I used a dremil type drill to remove the plastic mesh but you could easily use a stanley knife and a hacksaw blade.The metal mesh just pushes out easily.If you have any rough edges you could use sandpaper to remove them.I would recommend a good wash and dry before re assembly

 

[billyhas]

This screen is there to straighten the airflow so the MAF can get an accurate reading, i actually talked to a company that remaps and they told me to avoid doing this.

Its still up for debate though

I think this is bulls--t .I really can't believe the screens could possibly make any difference to the "straightness"of the airflow.I simply removed a restriction which increased airflow

 

[rsmith]

I think this is bulls--t .I really can't believe the screens could possibly make any difference to the "straightness"of the airflow.I simply removed a restriction which increased airflow

I have read on several forums and told by mappers it purpose is to straighten air and protect the maf, If it does straighten air to get a more accurate reading then your reading with not be accurate there for your AF mix will be wrong inevitable hurting power not increasing it.

This has been tackled a few time on this forum, still no decisive conclusion but for the sake of 4g/s is it really worth it?

 

[traumapat]

I think this is bulls--t .I really can't believe the screens could possibly make any difference to the "straightness"of the airflow.I simply removed a restriction which increased airflow

You have to ask why theres screens in the first place... they`d have made more profit not bothering. I have heard too that they play a part in the mafs reading but who knows.

Suck it and see

 

[Willie]

You have to ask why theres screens in the first place... they`d have made more profit not bothering. I have heard too that they play a part in the mafs reading but who knows.

Suck it and see

But perhaps in there developement they never tried with these removed to see if they help/reduce the restriction.
They might have thought the screens needed to be there no matter what.
The only way to prove this it to do this on a RR, back to back.
MAF readings are to believed and have proven to be correct with an upscaling figure to give an arrurate BHP reading with the screens in place
Perhaps it's also correct with the screens removed.

I would only be convinced with BHP or Torque increase proven on a RR

But am still thinking about doing this too

 

[leon cupra r]

But perhaps in there developement they never tried with these removed to see if they help/reduce the restriction.
They might have thought the screens needed to be there no matter what.
The only way to prove this it to do this on a RR, back to back.
MAF readings are to believed and have proven to be correct with an upscaling figure to give an arrurate BHP reading with the screens in place
Perhaps it's also correct with the screens removed.

I would only be convinced with BHP or Torque increase proven on a RR

But am still thinking about doing this too

Very true Willie, also, Seat may have put the screens in there as extra protection for the MAF / to smooth out airflow, whatever the reasons, and even with them in there may have been perfectly enough airflow for a stock engine.

However, once remapped etc, the grills may start to become restrictive for the extra airflow required by the engine.

As you said, theres only one way to find out!..... FIGHT!! (sorry couldnt help myself!)

 

[wild willy]

I've done this and rate it highly. You can see that the turbo is boosting spot on to the requested too. A log of channel 118 would be good to see n75 duty cycle. The Jetex and descreening has removed 2 of the biggest restrictions in your intake, now all you need is a 3 inch custom TIP and your there.