Dual intake system???

[elroo]

im trying to install a dual intake system in my automatic 94 explorer,my only concern is the MAF sensor do i need 2 sensors or it will work with only 1 or wont work at all. please Help

 

[O.Madsen]

Good question, but 2 sensors? I dont see how that would be possible. ? Normally one signal would be recieved, but with 2 .. How are you going to do that?

My bet is you only chance is with one sensor.. on one bank.. But how that would turn out in reality.. Well, thats a whole other story...

what is you point in making this dual intake, anyways?

Regards,

Ole

 

[elroo]

my point of trying to make a dual intake system to see if a can get a little more horse power or fuel economy,and for the looks

Thanks for the help

 

[O.Madsen]

For the Hp i doubt this would be worthwhile, when you´re thinking of all the different ways to improve airflow (& mpg) such ass swiss cheese mod, CAI etc. Without a proper exhaust system benefits would be little (in terms of power), besides better throttle response and WOT sound..

But if you do it for the looks. Well. Go ahead. There is not really anything to discuss.

I say do what you wanna do. But i think you should give some of the clever people a chance to jump in before you go ahead with the dual setup. I bet someone would have some good input to consider before jumping into it.

But hell, i´d love to see how this one would turn out.

Ole

 

[SuddenDeath]

The two intakes would have to join at one point to go into the throttle body...i'd just somehow mount your MAF there. Two intakes, both comming into 1 MAF and then into the TB. Make sense to me.

 

[Joe Dirt]

Yep- the MAF would have to be after the join, or the fuel curves will be all messed up.

 

[94Gexplorer]

so my quesion is how would this provide any gain over stock besides sound its still the same motor it will suck the same ammount of air no matter how many filters you put on it unless internal work is done

 

[elroo]

thanks for the great tip SuddenDeath install the maf sensor were the 2 intakes connect to the throttle body

 

[jd4242]

Swap the maf out to a mustang gt 77mm wile your at it and do a tb min,all cheap and will let more air in.

 

[elroo]

jd4242 ur saying to swap the maf sensor for a mustang gt 77mm right

 

[jd4242]

Yep

 

[Turdle]

And once it is all hooked up , don't forget the oscilloscope so you can see the distortion created in the maf signal by adulterating the upstream airflow.

Mafs are "tuned" so to speak. You cannot change what is upstream of the sensor without effect. The effect could be bad

 

[shawn.m]

swap in a 93 up aerostar MAF sensor - it is 75mm. what I did for $20 to the junkard

 

[2000StreetRod]

increasing the MAF sensor diameter

The PCM uses the MAF sensor output to calculate engine load. While increasing the diameter of the MAF sensor reduces air flow friction it also reduces air flow speed because of a larger cross sectional area. A lower air flow speed results is a lower mass air flow reported to the PCM. The PCM reduces the fuel injector pulse width resulting in a lean mixture. The O2 sensors detect the lean mixture and report it to the PCM. In closed loop the PCM adjusts the fuel trims, widens the injector pulse width and restores the optimum air/fuel ratio. If the MAF sensor diameter is increased too much the PCM will reach the fuel trim adjustment limits and the air/fuel ratio will be lean.

When the PCM is in open loop (as in WOT) the O2 sensor outputs are ignored and the mixture will be lean sacrificing performance. The ignition spark advance will also be compromised because the calculated load is incorrect.

I frequently read posts on the forum stating that acceleration performance improved after installing a larger diameter MAF sensor. I challenge any of those members to validate the statement with dyno test results or track test times. I believe the perceived improved performance is a result of the changed intake air noise. I went from a stock 55mm MAF sensor to a lightning 90mm MAF sensor which required a custom tune to restore my optimum air/fuel ratios which were monitored and recorded via a wideband a/f ratio meter.

 

[jd4242]

I agree but how big is too big and what are the limits on computers end?all ways smart to get a tune after changing anything.

 

[shawn.m]

good posts! I can actually do some time tests with both MAF Sensors and record the differences. That would address what gains am I getting from a less restrictive intake system.
I used the same MAF sensor from the stock so that I would avoid messing with the computer. My goal was to avoid the flow restriction inside the stock box and the stock MAF Sensor housing. Since I used a MAF Sensor housing from a 4.0 the sample tube should be the same. Or the air going past the sensor should be the same amount.
the hp gain would be from less restriction in the air box and less restriction in the MAF Sensor housing. I should be gaining in closed loop as the computer adjusts to more air coming in with less work. In open loop I may be running lean as the computer goes to fixed fuel rates. Normally Ford does their stock computers really rich stock for WOT. Unfortunately I don't have a wide band to measure at the moment. I do have a regular A/F meter that I need to hook up to see if I am running lean.

sorry for the long post.

For the OP - If you want to do it - do it. But do it for looks and your self. I would not expect huge hp gains.
Here are some suggested part numbers to build your systems.

MAF sensor to air filter
http://www.spectreperformance.com/#CATALOG.8145
1 y-Adapter
http://www.spectreperformance.com/#CATALOG.9479
Universal Air Filter to Intake hose
http://www.spectreperformance.com/#CATALOG.8220
2 of these
http://www.spectreperformance.com/#CATALOG.8748
then 2 of these at the end of the hose in the bumper to catch cold air.
http://www.spectreperformance.com/#CATALOG.9787

 

[2000StreetRod]

Spectre air filter

I have a Spectre cone air filter with 4 inch diameter tubing to the 90mm MAF sensor. The main intake tube then decreases to 3 inches for my racing 75mm throttle body as shown below. The red arrows indicate the location of T bolt clamps I used instead of screw clamps.

When I opened the sealed package on the Spectre cone filter there was a strong smell of oil so I let it air out for a couple weeks before installing it to avoid contaminating the MAF sensor element. I don't like pulling warm air from the engine compartment in the summer with the cone filter. I eventually will revert to an Amsoil drop in filter that has excellent filtration, air flow and no oil. I have removed the cone silencer in the lower section of the air filter enclosure and have two 1.75 inch diameter air inlet tubes connected to the front of my Sport as shown below.

I still need to modify the upper section of the air filter enclosure for a 4 inch diameter tube.

 

[shawn.m]

Pic of my setup.
I am using the Aerostar Air Intake tube, Aerostar MAF Sensor, Spectre 4" Adapter with the 4" Spectre Air Filter. Lots of fresh air coming up to the air filter from the front. I do need to build a heat shield to block the air filter off from the engine compartment.
Eventually I am thinking about going to a enclosed air box so that I could run a snorkel.