Speed density to MAF help

[Punisher]

I have a speed density out of a 89 mercury and want to convert to MAF. Any links. How tos. Videos would be great. I've searched but still lost. I need pics or vids. Lol. Easier the better. Thanks.

 

[Timmy390]

89 Mercury what? Cougar? Capri?

I converted a 96 SD E350 van to Mass Air SN95 Stang. Those two system are very closely pinned.

I recall during my research that converting the early ones is not that hard. Just have to track down a pinout of the EFI you have now. Add a few sensors and an additional O2 and swap a few pins. I think you can even leave it "bank" fire on the injectors.

Tim

 

[Punisher]

Grand marquis

 

[DirtDonk]

Interesting. I thought you needed a new MAF based computer too. But apparently not if you say all you have to do is re-pin things. Very interesting.

As for sensors, obviously you need the MAF sensor.
The MAP (manifold absolute pressure) sensor stays the same, but you remove the vacuum hose from the fitting and leave it open on the sensor and cap off (obviously) the engine side. This turns the same unit into a BAP (barometric pressure) sensor.

Those are two that come to mind.

Paul

 

[Timmy390]

Paul, I didn't explain myself...yes you need the mass air ECU.

There is a Youtube video of a guy changing over a T-bird. I can't find the link I thought I had. Let me look for it.

Tim

 

[Timmy390]

Found it......Badshoe

https://www.youtube.com/watch?v=mnnTgXkHU9Q

Tim

 

[pcf_mark]

Why would you want to use a MAF?

 

[DirtDonk]

Not sure about the OP, but the main reason is to make it more responsive and cooperative with any modifications. Even better breathing exhaust can sometimes throw Ford SD a little bit of a curve, but cams and other stuff are just not going to make it happy. Aftermarket SD systems (most of them out there) don't care about that stuff. But factory SD is not mod-friendly.

I seem to remember it's a little less responsive to major changes in altitude under modified conditions too, but it's been so long since we've talked about Speed Density I might be making that up in my head.;D

That what you have in mind Punisher? Or are you just doing it to do it?
If so, and you're just running stock, or fairly stock stuff, nothing wrong with SD.

Paul

 

[Broncobowsher]

Will also need injectors. The grand marque uses smaller injectors than the MAF computer is expecting to be firing.

 

[pcf_mark]

Not sure about the OP, but the main reason is to make it more responsive and cooperative with any modifications. Even better breathing exhaust can sometimes throw Ford SD a little bit of a curve, but cams and other stuff are just not going to make it happy. Aftermarket SD systems (most of them out there) don't care about that stuff. But factory SD is not mod-friendly.

I seem to remember it's a little less responsive to major changes in altitude under modified conditions too, but it's been so long since we've talked about Speed Density I might be making that up in my head.;D


That what you have in mind Punisher? Or are you just doing it to do it?
If so, and you're just running stock, or fairly stock stuff, nothing wrong with SD.

Paul

Interesting thanks I have avoided SD because of the restriction.

 

[Tiko433]

I'm looking into doing this now for my sons 89 FSB 5.0 it is SD. There is a company that offers a kit that does everything. It's pricey but comes with everything that is needed. I can't remember the company's name.

 

[Punisher]

Thanks Timmy. That was almost a info overload. I put the speed density on my motor about 5 years ago and to be honest I don't know what if any was done to the motor. But it idles bad and doesn't rev good. Plus I have a cam I want to put in it. Just hopping to run a little smother and not worry about future mods.

 

[Punisher]

So I guess I'm going to look for a computer and some injectors. Then just add some wire.

 

[brianstrange]

So I guess I'm going to look for a computer and some injectors. Then just add some wire.

The throttle body is smaller than a 86-93 5.0 mustang as well. You will need to do some re-pin work, add VSS wires, add pin 19 (Fuel Pump monitor) circuit, add a second O2 sensor. You will also convert the MAP sensor to BAP sensor by removing and blocking the vacuum line on the engine side.

It's pretty easy to do, but that motor will need a lot of work before you see a benefit. This change will not help your motor unless you change heads and cam. You may find that converting to an explorer motor and computer will save you some dough, while returning respectable performance.

 

[Punisher]

The throttle body is smaller than a 86-93 5.0 mustang as well. You will need to do some re-pin work, add VSS wires, add pin 19 (Fuel Pump monitor) circuit, add a second O2 sensor. You will also convert the MAP sensor to BAP sensor by removing and blocking the vacuum line on the engine side.

It's pretty easy to do, but that motor will need a lot of work before you see a benefit. This change will not help your motor unless you change heads and cam. You may find that converting to an explorer motor and computer will save you some dough, while returning respectable performance.

What do you mean by a second 02 sensor? I have one after each exhaust manifold now. I would need another?

 

[Timmy390]

What do you mean by a second 02 sensor? I have one after each exhaust manifold now. I would need another?

Interesting.....I was under the impression all SD systems used only one O2 sensor. The system I converted had only one and I had to add the second one the MA system was looking for.

If you have 2 now you got all you need.

Tim