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MAF conversion
#697650 October 12th 2015 8:53 am
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eastbay Offline OP
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Hello All! New 1993 E250 (28k miles!) owner here.

I'm planning on towing a boat long distance and I'm interested in optimizing performance on the 351w; I also wouldn't mind gaining some mpg.

Has anyone done a MAF swap out for the SD system? This seems to be the closest to a plug and play kit that I can find- http://shop.fiveologyracing.com/1985-96-FORD-F-SERIES-50-58L-E4OD-MASS-AIR-CONVERSION-KIT-FSEMAK.htm

But it says at the bottom in tiny print that it is not compatible with the E Series, which may because of the K&N intake and mount that they suggest you use, so it isn't quite P&P for us. With the K&N kit that we can't use it costs $1k.

The Fiveology site claims a 4-6 mpg gain, it would pay for itself if that is true.

I understand that the MAF unit also converts the motor to sequential (one at a time) rather than bank (4 at a time! WTF?) injection, which I don't fully understand but sounds good.

So has anyone tried one?


Re: MAF conversion
eastbay #697658 October 12th 2015 10:40 am
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YES! I did this swap on my 1989 Ford E-150. Honestly, I would not recommend doing it. It is a complicated process that really doesn't benefit much. I did my swap using parts sourced from 5.0 Mustangs. See here.

That kit will work with an E series, but you are right- the K&N air filter housing is not intended to work with a van body. If you read the thread I made documenting my conversion from speed density to MAF, you can see your two options- cobble something together, or spend the time to track down the hard to find factory parts.

Bank or batch fired injection is actually fine. Once you get off idle RPM the intake valves are opening so fast that there is little difference between batch fired and sequential fired injectors. Think about it. An injector fires once every two engine revolutions. If your engine is turning 2000 RPM the injector is firing 1000 times per minute. That means the injector is firing 16.67 times PER SECOND. Whether the injection system is batch fired or sequential, there is really going to just be a constant mist of gasoline hanging outing the intake waiting to be sucked into the engine.

If you MUST do this, that kit looks like a good deal, provided you can get the air intake ducting sorted.


Windows- they're what make a van worth owning!
Re: MAF conversion
eastbay #697659 October 12th 2015 10:51 am
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Nice, Thank you. Sorry I missed the other thread, I'll look at it because I'm interested, but you saved me a lot of time and money and what you say makes sense- I never thought of how often those suckers are going off! So they are more or less maintaining an explosive charge I guess, waiting for the spark, which as you say happens a lot. Very interesting.


Re: MAF conversion
eastbay #697667 October 12th 2015 4:37 pm
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carpal tunnel
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Ford played with SFI vs Bank Fire injection quite a bit in the late 80's and early 90's. They built and sold a model of their "Lightning" pickup that had a supercharged 351. Ford engineers were so worried that the engine would lean out at higher RPM the computer was actually programmed to, under the right conditions, do both! Under full boost and WOT conditions the computer would fire the injectors sequentially AND as a bank to insure they wouldn't burn a piston. Do the math....!! Very, very rare factory computer set-up and impossible to find.
As far as MAF vs Speed Density I agree with Reed, I don't think it's worth the trouble. The SD systems will pull just as hard or harder in a towing application.

BTW.....1996 and a very very few late 1995 (E350) 351w equipped vans were MAF from the factory.

Last edited by CatFish; October 12th 2015 4:43 pm. Reason: kant spel
Re: MAF conversion
eastbay #697673 October 12th 2015 6:18 pm
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I would love to put a Lightning supercharger and computer in my van, though. laugh laugh laugh laugh laugh


Windows- they're what make a van worth owning!
Re: MAF conversion
eastbay #697685 October 12th 2015 9:23 pm
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OK, so if I stay with SD there seems to be varying opinions available in interweb land as to the best or any performance upgrades that can be done.

If I'm looking at keeping it CA legal, is there anything that I could do like intake, mild cam, better flow exhaust- or should I just leave it alone? Again, it is a 1993 with only 28k miles, unmolested. I'd also like to stay stealthy.

Re: MAF conversion
eastbay #697697 October 12th 2015 10:43 pm
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carpal tunnel
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Originally Posted by eastbay
OK, so if I stay with SD there seems to be varying opinions available in interweb land as to the best or any performance upgrades that can be done.

If I'm looking at keeping it CA legal, is there anything that I could do like intake, mild cam, better flow exhaust- or should I just leave it alone? Again, it is a 1993 with only 28k miles, unmolested. I'd also like to stay stealthy.


Keeping it smog legal would be hard to do in CA from what I know of California laws. I know very little about them but I understand they are very strict.
Here in metro Atlanta we have no visual inspection (except to verify that it has a converter), if it passes the tests that's what they want and they don't care what other changes have been made. It's not statewide here and only goes back 25 years. Any vehicle 20 years or over also gets a special allowance if needed to pass.
If you get better/colder airflow in and better exhaust flow out there may be a few add-ons sold/talked about on the interweb that claim to "fool" the factory computer into richening the mixture but they are not legal.
Have you considered a Gear Vendors type of mod?

Re: MAF conversion
eastbay #697761 October 13th 2015 9:05 pm
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Thanks Catfish! I'll keep looking, but maybe I'll be staying stock- that GV system looks cool as hell but pricey!


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