Advantages of running MAS in "Blow Through"?

[chriso]

What are the advantages of running a GM MAS in "Blow Through" mode vs. using a stock or Lex AFM? Should I stick with my Lex or go the GM route?

I am ready to purchase my MAFT-Pro and don't quite understand the full capabilities of the unit especially running the "blow through" style. And, yes, I've read through all 80+ pages of the post in here.

 

[Kyle87T]

Why would you want to run blow through when you can run in speed density? It removes the AFM totally.

 

[chriso]

Why would you want to run blow through when you can run in speed density? It removes the AFM totally.

I don't know???? What is meant by "speed density"?

 

[90T04]

You can only run speed density with the MAFT Pro. The regular MAFT unit only lets you run a GM MAF (mass air flow sensor). The MAFT takes the signal from a MAF sensor and translates it to a signal usable by the Toyota ECU.

Speed density based air measurment utilizes a MAP sensor (or Manifold Absolute Pressure) sensor to determine the amount of air coming into the engine. The MAFT PRO translates the signal from the MAP sensor and provides it to the Toyota ECU in a form it can recognise.

But to answer your question, the advantage for me running in blow through mode was the fact that I didnt have to have any pre - turbo restriction. I just used a 4" intake pipe to a large filter, and installed my GM MAF in the IC pipes before the TB.

Some people have said that the MAF is not supposed to have pressurized air flow, but honestly it works perfectly in blow through mode. My car ran better with the MAF in blow through than it ever did with a Lexus AFM.

Hope this helps.
Ryan

 

[hottscennessey]

:withstupi

The perks of running GM MAF in blow through seemed so petty when i first considered it, it was only after i installed it when i realized what a great modification it really is. I love it, and the only reason i wouldn't switch to MAFT Pro is because this works so well for me, it wouldn't be worth switching.

 

[chriso]

You can only run speed density with the MAFT Pro. The regular MAFT unit only lets you run a GM MAF (mass air flow sensor). The MAFT takes the signal from a MAF sensor and translates it to a signal usable by the Toyota ECU.

Speed density based air measurment utilizes a MAP sensor (or Manifold Absolute Pressure) sensor to determine the amount of air coming into the engine. The MAFT PRO translates the signal from the MAP sensor and provides it to the Toyota ECU in a form it can recognise.

But to answer your question, the advantage for me running in blow through mode was the fact that I didnt have to have any pre - turbo restriction. I just used a 4" intake pipe to a large filter, and installed my GM MAF in the IC pipes before the TB.

Some people have said that the MAF is not supposed to have pressurized air flow, but honestly it works perfectly in blow through mode. My car ran better with the MAF in blow through than it ever did with a Lexus AFM.

Hope this helps.
Ryan

Yes, it helps a lot for me to understand. Thank You. Now I only have a 60-1 Trim CT-26, so would it be advantageous for me to run this method?

:withstupi

The perks of running GM MAF in blow through seemed so petty when i first considered it, it was only after i installed it when i realized what a great modification it really is. I love it, and the only reason i wouldn't switch to MAFT Pro is because this works so well for me, it wouldn't be worth switching.

So you wouldn't run MAFT-Pro???

 

[hottscennessey]

Nah, I'm 100% content with MAF-T.

 

[MK3Brent]

Not to mention the blow through close to the TB means you can blow off your IC pipes, and still make it off the road somewhere safe to fix it.

 

[Untouchable7mgte]

amen love my MAFT. Blew numerous IC pipes and the car rans like nothing happened. Just wish i had a wideband to tune it a little more. that Vf signal thing sucked

 

[Cya]

Those DSM guys are running blow thorugh mod with two clamps on both sides to prevent IC pipe blow off...just an FYI.

 

[hottscennessey]

I run T-bolt clamps w/ it and it helps a lot. I havn't blown a single one off yet at 22psi.

 

[Cya]

Is anyone here running a FFIM?

 

[hottscennessey]

I wish.. I might run one and stick with MAF-T (obviously).

 

[pimptrizkit]

i couldn't see any reason not to run speed denisty,

it's the way i set mine up.

i can have no filter pipe, or run what ever cobination i want off the turbo,

i have a air temp sensor about 10 inches before the tb, and have the map sensor posted on the back on the manifold by the fire wall.

speed denisty is a calculation done by the pro, which figures rpm, air pressure, air temp,pump size (3L in our case) tps, and figures out how much air is going through the motor at 100 percent efficcy, know this will give you how much mass the air has, and how much fuel should be added.

 

[Nick M]

i couldn't see any reason not to run speed denisty,

Becuase a mass air flow sensor is more accurate. Speed density is fine on a track car, or with dyno time.

 

[Cya]

another point the should be said is that to run blow through mode you need your MAF to be 6-8" from the TB, the same goes for the MAF to the BOV.

 

[hottscennessey]

^ and the turbo. a member on this forum had a slew of problems which all cleared when he relocated the MAF.