MAF Distance

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Apr 23, 2008 | 12:10 PM

78F150XLT

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From: On a farm in Alberta.

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?

Apr 26, 2008 | 08:39 PM

ReAX

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From: Central Florida

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.

Apr 26, 2008 | 10:47 PM

78F150XLT

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From: On a farm in Alberta.

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.

Apr 29, 2008 | 08:44 AM

Conanski

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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.

Apr 29, 2008 | 11:10 AM

78F150XLT

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From: On a farm in Alberta.

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)

Apr 29, 2008 | 02:47 PM

Conanski

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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.

Apr 29, 2008 | 03:00 PM

ReAX

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From: Central Florida

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.