Dual MAS Setup

[16g-95gsx]

After reading up on MKIV Supras for a while you will eventually find out about their dual MAF trick. Basically a single MAF will flow only enough to match about 500whp or so without becoming a restriction itself. Now the Supra guys have began (for a few years now) using dual MAF's as a cheap alternative to the VPC. They will install a form of a "Y" intake pipe with dual MAF's at each of the tip and the filter at the other end, and then they will attach one of the MAF's up to the factory harness, and then the other MAF's runs off of the same wiring as the original one EXCEPT the output signal for the airflow. Instead they use the Safc's blue wire to connect to the output signal. They then adjust fuel accordingly. It appears that it is a very basic recalibration that would need to be performed on the Safc in the beginning to account for the lost air value, but that exact value could be picked up by the Blue wire mod easy. What are your thoughts on this. I want a nice in depth discussion about this, as the physical aspects of this project would be very easy to do, just the tuning would be the difficult part IMO. There is the threat of potentially running rediculously lean in the beginning, so some initial calculations would need to be made for sure. If this works however, we could potentially have the intake power of a VPC with the cost of around 150 dollars total or so.

 

[ItsStockOfficer]

You could have 10 MAF's and it would not flow like a VPC. Theres still restrictions and then more turbulence when the air merges. In addition the blue wire measures voltage and our mas measure Karman HTZ, not a measureable value using that input.

 

[Culetto]

it sounds like an interesting idea to me, but explain a little more how it would hook up to the harness, if you ran them both parallel would it tell the ecu that double the air was comming in?

 

[KenTSIII]

Why would you go to all this trouble when you can just hack you mafm go 2g maf, or use the safc w/ the dejon intake w/ the bypass tube? Sounds like someone thought waaay too much when there was a very simple solution staring them in the face.

 

[GoSpeedRacerGo]

Not to mention the reduced flow from having X amount of MAFs and not short route piping to the turbo

 

[BatmanGSX]

When your are making 400hp you can pull your honeycombs out. Are you making anywhere near that? Then don't worry about it.

 

[dsm1]

Actually it could be feasible to run dual mafs, we are working on a set with 2 granitelli 80MM mas air's in our drag FWD with a narrow angle y pipe feeding the turbo. Yes, car is standalone. Yes, we actually idle great like this, odd for this engine.


jeff hidek, Pres.
Diamond Performance

 

[ItsStockOfficer]

If you have a standalone, why the hell would you not go speed-density? @ mas's is still a restriction, and it still creates turbulence...

 

[dsm1]

Some particular engine setups lack part throttle response with speed density, ie., anything that affects vacuum.

 

[dsm1]

BTW, its only being tested on the drag car, not for permanent use on this application.

 

[ItsStockOfficer]

Originally posted by dsm1
Some particular engine setups lack part throttle response with speed density, ie., anything that affects vacuum.

VPC's maybe, not standalone systems....speed-density on a ems is like it was designed that way...