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Old 04-23-2008, 12:10 PM
78F150XLT 78F150XLT is offline
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MAF Distance

hey! on my 95 F150 i put a gt 40 upper/lower intakes with a 65mm thorttle body. i had to get a BBK cold air intake for a 93 stang to use the throttle body cause stock ones on F150s of that year are dual throttle bodies. i need to make a bracket/fitting so i can bolt the BBK round air filter to the MAF block in my air tube. My question is, is the distance from the filter to a MAF block need to be a certain length or it dosnt matter? and the sensor tahst after the airfilter still in the stock air box, where do i mount it?
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95 F150 Reg. Cab, Long Box, 4X4, Customd

02 F250 Lariat Ext. Cab, Short Box, 4X4.
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Old 04-26-2008, 08:39 PM
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It doesn't really matter, but the distance can give different readings. I am not sure about your MAF, but you should have a separate air temp sensor. The temp sensor should be in the coolest place you can find in the run, normally closer to the filter and away from the radiator.

For the MAF, the air has more opportunity to straighten out and increase velocity. Closer to the filter will probably match your calibration closer.
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Old 04-26-2008, 10:47 PM
78F150XLT 78F150XLT is offline
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ok thanks. I was just wondering if it will effect how well my truck runs. I was told it mught but on an after market MAF system i found the MAF block was quite further away from the air filter then a stock one.
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95 F150 Reg. Cab, Long Box, 4X4, Customd

02 F250 Lariat Ext. Cab, Short Box, 4X4.
6.5 Procomp lift, 37/13.5/20 nitto mud grapplers, Garret turbo, boost fooler, studs, 4inch Turbo back exhaust to 5in stack, Injectors, fuel pump, AFE Stage 2, NADP tranny, ZEX Nitrous, edge evo. Possible common rail next??
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Old 04-29-2008, 08:44 AM
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You don't want an open filter element under the hood attached directly to the MAF meter. Yes.. all the stang guys do this it seems, but that's just the ones that don't know any better. The reason not to do this is fan wash will disrupt airflow over the MAF sensor element and this will hurt performance and milage. It will also draw only hot under hood air, this too will hurt performance. Putting the filter in a box and ducting it to outside air avoids both these issues.
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Old 04-29-2008, 11:10 AM
78F150XLT 78F150XLT is offline
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ok.. can I use flex tube as the elbow for the bend? what should I build my box out of to make it heat resistant for the coldest air (I have a ram air hood by the way)
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95 F150 Reg. Cab, Long Box, 4X4, Customd

02 F250 Lariat Ext. Cab, Short Box, 4X4.
6.5 Procomp lift, 37/13.5/20 nitto mud grapplers, Garret turbo, boost fooler, studs, 4inch Turbo back exhaust to 5in stack, Injectors, fuel pump, AFE Stage 2, NADP tranny, ZEX Nitrous, edge evo. Possible common rail next??
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Old 04-29-2008, 02:47 PM
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Plastic or light aluminum are good materials to use, I have seen others relocate the washer/coolant tank back to the stock airbox location, and use the front corner to house the conical air filter inside a custom box. The opening in the rad support where the stock 460 air duct would go will act as the air intake.
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Old 04-29-2008, 03:00 PM
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PVC pipe makes great tubing, but I went a different way on my custom intake. I used rubber sewage fittings to connect aluminized exhaust pipe up.

You could probably make a nice airbox from a big piece of PVC pipe (8"+), cut a portion of it off and seal it to your hood, use a bushing to support the filter. I think it can be done nicely.
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Old 04-29-2008, 10:15 PM
78F150XLT 78F150XLT is offline
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I was thinking of building the box out of a sheet of aluminum and then mod then under side of my hood so the ram air will tie into the box... so flex tube wouldnt be a good idea hey? I'll look for a 90 elbow so I can make the filter work with the box... I was going with aluminized exhaust pipe like ReAX did. I'll pick some up tomarrow when I head to town. I'll get back to you guys
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95 F150 Reg. Cab, Long Box, 4X4, Customd

02 F250 Lariat Ext. Cab, Short Box, 4X4.
6.5 Procomp lift, 37/13.5/20 nitto mud grapplers, Garret turbo, boost fooler, studs, 4inch Turbo back exhaust to 5in stack, Injectors, fuel pump, AFE Stage 2, NADP tranny, ZEX Nitrous, edge evo. Possible common rail next??
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