Subject	maf attack!
Posted by	andygp on April 21, 2012 at 4:45 PM
	This message has been viewed 943 times.
Message	Hi, I have reached a stage where I need to fabricate the pipework for the dual MAF/Selin kit and firm-up the final location of the huge RAMAIR filters. I am going to mount each filter above each side scoop, which will sit in air flow that enters the centre nose section and travels up to the engine bay under the the hood, and each will also be served by a small custom scoop in either side of the front fascia specifically for same. Filters will live here... I have not converted turbo/inlet to 3" piping yet - but will do at a later stage; but while I am fabricating inlet, I intend to use 3" (76mm). So I have started mocking up the 76mm piping where they will join the 63mm stock air inlet pipes in the centre nose section: Looking like this currently.. So the new piping will join to the existing pipes, 90 degree forward and then 90 degree back under the old headlamp position each side - then 45 degree forward to sit/secure on top of the outside/top of the new main scoops. I really wanted these to be one piece per side with no joins - so the MAF unit on each side became a bit of an issue for me... ...I searched and found that a few people had had a similar issues and had fixed it by dismantling the MAF and remounting the parts in a custom flange welded to the pipe work and/or using a MAF mount - which would create 2 more joins!!. Like this excellent effort: And a typical MAF mount section: (v expensive!!) These seem good solutions... I decided to simplify - So I just cut the ends off my MAF(s) and then sliced them down so that all the original delicate parts/housing remains untouched, but easily mounted on the new piping as below... Cut here.. These are the two ends cut off and the sensor section removed: And we end up with this... To mount this anywhere in my new inlet piping I simply have to drill a 20mm hole and glue the unit on with a suitable sealer as shown on this piece of scrap tubing: To me this makes a lot of sense - but I don't think I have seen anyone else chop up there MAF and mount it in this way before!! I also removed the little mesh screens that protect the MAF element from 'objects' in the airstream - I hope to fab these into the pipework in-front and behind the MAF unit when in the new pipework somewhere. More 76mm pipe is awaited so I cant finish this yet - but will post some more pics when I can get the welding done and it's mounted on the front. To remove/clean the elements I envisage chopping them out of the silicon with a cheese wire and then just re-sealing them back in afterwards! Question: Is increasing the run length of the inlet piping going to have any effect on how she runs/idles/whatever? Because of the Selin cable lengths - the MAFS will still be mounted pretty much close to where they would mount in a stock conversion. Comments appreciated as ever.
Follow Ups	maf attack! - andygp 16:45:53 04/21/12 Those are some pretty harsh 90's, was there no other way - FuerGrissa 17:24:34 04/21/12 Re: Those are some pretty harsh 90's, was there no other way - andygp 02:29:00 04/22/12 ...and I have Selin DMS (n/m) - andygp 06:24:52 04/22/12 Ram air? (n/m) - BigTDogg (MA) 20:18:38 04/21/12 Re: Ram air? - andygp 01:54:32 04/22/12 yes, it will make a difference (n/m) - Dane (Houston) 03:15:39 04/22/12 Re: yes, it will make a difference - andygp 06:24:04 04/22/12 cool, way to go (n/m) - Dane (Houston) 10:08:05 04/22/12 shhh! - LJZTT 04:08:53 04/22/12 Re: shhh! - andygp 06:22:44 04/22/12 Ram air on this car is bad. Causes turbulence past the MAF - BigTDogg (MA) 11:39:13 04/22/12 I don't think I buy that - FuerGrissa 13:55:44 04/22/12 Not with those 90s (n/m) - BigTDogg (MA) 21:18:04 04/22/12 Its long proven that you will never make pressure - Antihero 08:31:52 04/23/12 Re: maf attack! - carwash 20:41:52 04/21/12 Re: Re: maf attack! - OverZealous (CT) 11:43:11 04/22/12 Everyone keeps misapplying that term. (n/m) - zfan21 14:58:35 04/22/12 MAP Sensor FTW! (n/m) - Z_Pilot 22:48:01 04/21/12 Re: MAP Sensor FTW! - andygp 06:23:17 04/22/12 I disagree... (n/m) - Machtavian 08:11:24 04/22/12 Educate me! - andygp 09:32:36 04/22/12 Not necessary, depends on the ecu and the tuning strategy. - ztunerz 11:54:10 04/22/12 Exactly, Maf is more accurate with our ecu. But, when you - Machtavian 12:40:06 04/22/12 Please redo those pipes, those angles make me cringe. - zxtuner161 00:54:35 04/22/12 Will do - when I'm done mocking up the run and mounts Mal. (n/m) - andygp 06:26:27 04/22/12 Re: maf attack! - andygp 02:24:27 04/22/12 Yeah the way you mounted it is very clever/a good idea. - Crazy Greek 07:11:59 04/22/12 Thanks Jo - I hope I will ;-)) (n/m) - andygp 09:59:15 04/22/12 Got it. Nice adaptation of the MAF. - OverZealous (CT) 11:47:09 04/22/12 /facepalm (n/m) - LJZTT 04:10:47 04/22/12 Interesting. Would like to see your total Motor compartment - Boosted1 06:57:42 04/22/12 How are you going to caliberate your maf ? (n/m) - ztunerz 11:51:58 04/22/12 Could he not just tweak the K-value in the ECU? (n/m) - EUGENE 04:53:31 04/24/12 No he would have to rebuild the vq curve. The correct - ztunerz 09:00:26 04/25/12 any pics of everything together in the bay? (n/m) - ZiNnYc 12:36:08 04/22/12 Why not run them blow through on the intercooler pipes - zxtuner161 16:30:54 04/22/12 wouldn't oil contamination be a big issue? (n/m) - Antihero 08:34:03 04/23/12 If you set your crank case vent up correctly you shouldn't - zxtuner161 16:46:39 04/23/12 If you set your crank case vent up correctly you shouldn't - zxtuner161 19:20:25 04/23/12
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