Lexus AFM or GM Air meter

[Crazybobmundo]

So I am facing a dilemma right now...

I have 2 Lexus AFM housings laying around and I just ordered 550cc's. Clearly I can just go that route.

The other option I have is the GM 3" Airmeter set up. I have 3 GM Meters on the shelf as well. The issue is that I have to obviosly buy that MAFT Translator box.

So I know the lexus AFM helps me increase power by allowing unmetered air to go through.
Does this GM sensor allow me to produce more power or is it just an option for its less restrictive airflow paths?

I kind of like the idea of not having an AFM infront of my turbo. But If a GM meter doesnt necessarily increase my power like the lex upgrade does whats the purpose of the GM mod?

Not sure if I have already asked this before, I apologize if I have but now Im closer to finishing my project and want better point of views on these two set ups.

 

[87M-GTE]

Does this GM sensor allow me to produce more power or is it just an option for its less restrictive airflow paths?

I kind of like the idea of not having an AFM infront of my turbo. But If a GM meter doesnt necessarily increase my power like the lex upgrade does whats the purpose of the GM mod?

The GM mass air flow meter is way more beneficial than a Lex afm imho, with the GM you can tune to match any size injector, with the meter behind the turbo you are allowed to vent you BOV to atmosphere with no issues, and you can either run open turbo or have a nice cold air intake. also there really are no limitations with the GM maft, being able to compensate up to 1000+cc injectors

*edit

http://www.extremeturbosystems.com/Toyota-86-92-MK3-Supra-MAF-Translators/c128_129_675/index.html

 

[rayall01]

^ +1 I'm going that route, as it's the least expensive way to upgrade from the stock AFM. You're already a step ahead, Having the GMs on hand. The standard MAFT is pretty cheap too. The pros cost more, but do more too.

 

[Crazybobmundo]

Nice nice. Well I was looking at the website where the maft systems are sold and I was reading on that gen 2 and how it has "AF Technology"

How it automatically adjusts ratios.

It doesnt seem to explain if it can be hooked up to a laptop or not or weather it shows you readings on its screen. Im assuming it can but..
Anyone know more on this Gen 2 Translator?

 

[grimreaper]

download the manual from their website. They also have a decent forum for their products too. Check it out, a bit of searching should answer all your questions in that regard

 

[Crazybobmundo]

Well so far it looks liek I will be going witht he GenII with the GM 3" Sensor.

Grimreaper, I did what you suggested and I found out that you can watch A/F ratios with the unit but it also says to compare the readings with a real wideband gauge. Obviosly I have to buy the O2 sensor seperately and need the LC-1 unit which is pretty pricey but Ill get that later.

Thanks guys for the advice.

 

[lewis15498]

I'm unsure about MAFT GEN 2 but theyre website says MAFT PRO is windows compatible.

 

[Poodles]

Karmen Vortex AFM is far more accurate then a hot wire MAF...

If you're going with MAFT, step up to the MAFT Pro and go MAP based and get rid of the meter entirely...

 

[lewis15498]

Karmen Vortex AFM is far more accurate then a hot wire MAF...

If you're going with MAFT, step up to the MAFT Pro and go MAP based and get rid of the meter entirely...

+1 I was estatic when i found out i could convert to speed density! suprasports got a kit that includes everything for the conversion + wideband o2 sensor

 

[TurboStreetCar]

No air meter or maf will increase or allow increase of power. The lex/550 modification increases fuel delivery. This is compensated by a larger afm housing to allow more airflow into the engine with less accounted for air to keep air fuel ratios correct.

The key to this upgrade is the larger injectors not the afm swap. Runnng larger injectors allows you to scale the air flow signal back to retain proper air fuel ratios thereby increasing the threshold of airflow to cause fuel cut.

The injectors are the key component in achieving this goal and utilizing either the maft/gm maf or lex afm will net the same results. The only diffrence is the lex afm will only work (theoreticly) with 550cc injectors at stock fuel pressure where the maft could allow for a wider range of injectors including stock and allow the ability to tailor the afm signal to tune air fuel ratios.

If you go maft and do decide to do tuning, monitor VF to keep the TCCS happy and do not try to tune in closed loop or the TCCS will correct itself and undo any of your tuning.

 

[IJ.]

Airflow Metered cars usually drive a little nicer as well

 

[bountykilla0118]

So I am facing a dilemma right now....

Crazy your dilemma will only get worst if you dont take the time to understand the basics of cars and performance ..... from the way you worded your question I would say you should to go lex afm. No offense, but you don’t seem to have a decent understanding of the metering systems and how they work. None of them increase your power per say, but they do leave you more potential to make power. Yet you want to install and play with the tune with MAF-T, or are you going to pay to have it done? Your pockets have to deep to play the game, and even deeper if you cant be your own mechanic.

Lex AFM is very user friendly and can support very respectable numbers and it doesn’t sound like you are trying to make 600rwhp.

 

[rayall01]

While I agree that the AFM is more responsive, it's propensity for failure tips the scale for me. I've gone through a couple of them so far, and I'm tired of that. The blow through factor weighs heavily in that choice as well. I would definitely like to vent to atmosphere with my next mod, without the potential for stalling/idle issues. Lastly, cost is the final deciding factor. The MAFT/GM system is the least costly way to eliminate the fragile AFM, and allow greater tuning flexibility.

 

[Crazybobmundo]

Bountykilla, I dont take offense. I asked this question for a reason, I didnt know the pros and cons.

I do understand that changing metering devices doest necesserally increase power.

The reason I worded it the way I did was so I wouldnt get a "Well why would you want to go Maft"...."Why lex upgrade"..."Get supporting mods". This and that kind of veers off to a whole other direction. So far everyone is sticking to the subject and giving their input.

No Im not looking for a 600hp build. Not at all. Maybe in the future I want 400 but as of now I just want a Supra that runs .

I just wanted to open up my options. I dont think money is much of an issue, I just dont want to go out just buying crap that I think I need. Im still shopping wisely, hence some of these questions.

Not to mention I do have the parts on hand minus a Maft translator.

 

[Crazybobmundo]

Another thing. If I wanted to I would just go get the MAFT Pro and just forget about all of this.
But I just dont feel like buying equipment that I dont think I need.

I know some of you may agree that a MAFT Pro is the better choice. But honestly I dont know how long I am going to stick with the set up and to dump 400-750 dollars on tuning devices to lets say a year later decide I want something else is kind of a waste. I think I said this before on an injector thread.

This is why I felt that the GM Meter or the Lexus AFM (which I have) were better options for me, as of now.

This isnt a how do I get to 600hp thread on a 200k mile engine... This is a what would you choose if you had these 2 options.

 

[lewis15498]

Another thing. If I wanted to I would just go get the MAFT Pro and just forget about all of this.
But I just dont feel like buying equipment that I dont think I need.

I know some of you may agree that a MAFT Pro is the better choice. But honestly I dont know how long I am going to stick with the set up and to dump 400-750 dollars on tuning devices to lets say a year later decide I want something else is kind of a waste. I think I said this before on an injector thread.

This is why I felt that the GM Meter or the Lexus AFM (which I have) were better options for me, as of now.

This isnt a how do I get to 600hp thread on a 200k mile engine... This is a what would you choose if you had these 2 options.

Well if you put it that way, Lexus AFM

 

[Nick M]

The purpose of the Lex meter is to slow the Hz from the meter, delaying fuel cut.

KV is not more accurate. More accurate thant what GM requested from Hitachi, maybe. Draw through is more acccurate, the air is not yet compressed. Vent to atmosphere is like driving with a bad tune when it opens. Just do it right, instead of hacking your cars then starting 10 threads on what is wrong with my car. Then saying that isn't it, because I drove it for 2 months and it didn't do that.

As stated previous, I think you should just go to the MAFT Pro, if you intend on going further. If you are going to stop at nothing more than a Boss Jr or similar, stay with the Lex meter.

 

[shaeff]

Here's my cookie cutter response to any LEX AFM/550cc thread. Read it, understand it, then read it a few more times:

http://rob.carlile.home.mchsi.com/lexus/lexus1.htm

 

[Poodles]

Yes, KV is more accurate than the hotwire setup.

Not to mention it flows more than the hotwire (unless you pull the screens out of the hotwire, but then they don't last long).

 

[Nick M]

Yes, KV is more accurate than the hotwire setup.

Not to mention it flows more than the hotwire (unless you pull the screens out of the hotwire, but then they don't last long).

It most certainly is not. KV can't even account for humidity, which effects density.