Was wondering if someone can educate me what is the difference between both of them.. Also, I've been told that LMAF (which is the meter that I am using) will not work in a blow through setup.. Here's how I am currently doing my TT...

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Is that blow or draw?

 

Thats blow thru.Which in terms means that it is after the turbo and air is being forced thru it or "Blow thru".Draw thru would put the meter in front of the turbo where air is being sucked thru or "Drawn thru" It all depends who you ask i guess kind of like which one is better auto or 5 speed?But from my underestanding it is hard to tune a blow thru for the streets as when you do a shortblast and let of the meter see's somethings out of wack and goes into open loop hence looking at a different VE table and as soon as it figures out everything is ok it goes back into closed loop.Please this is just my two cents take it for what its worth.

 

The new hot ticket in terms of metering is supposed to be blow-through with a 05+ maf. Apparantly it gives the ebst signal, you can buy em from justin @ VMP tuning. I am thinking that i will be going with one of those once i get my blower on.

 

This is just my experince but I did try that setup when I had a Vortech on my car. I had absolutly no luck with it because there was a lot of signal noise. I aculay did every thing I could to try to reduce noise, put it in the straightest section of pipe as far from a bend as possible. I think If I could have come up with a screen it would have been great though.

 

I forgot to say but I ended up going back to an older pro-m draw through. It was not perfect either but was a lot easier to tune.

 

good to know. I think this style of metering is pretty new so there isn't alot of info out there, aside from people that are trying to sell me stuff (Don't get me wrong, Justin has been great in answering all of my questions) so it's nice ot hear a third party.

 

Not a problem. I know other people have had great success with it which makes me kind of wounder.

 

It's been from two sources that tells me that the LMAF is a big no no for blow through. I went to VMP and holy crap, 199 for the Blow-through 75MM MAF, damn.. I thought that it would be easy to tune with the LMAF, but I guess if you go the draw through way.. Damn..

 

But it will support 600RW in that 75mm

 

Now that I did not know... Does the regular 05 GT MAF support the same HP? no Uh?

 

i converted my 02 gt with a vortech on it to blowtru. i am using a 95 mm mass air i got from snipertuning which is a promass meter. it worked great for me. people i talked to siad it is better than draw thru because it is metering air that is actually going in to the motor. for some reason the fuel can be cut back about five percent on a blowthru as well. i will always use blowthru.

 

there is a guy on MPH, making about 850rwhp and uses a LMAF with MPH's Maf Extender in a blow through setup.

 

Not so much... IIRC 300 in 3" and like 400 or something in a 3.5" ... a Mafia might fix that, but I don't know what the range of the stock meter is... the HPX is the way to go really with capability for over 1000HP worth of airflow reading

I hear ( no personal exp) that the 05+ meters DO NOT like tube sizes more than 3.5"

 

Many people have told me that it is a pain to tune LMAF and that the reading on a blow thru was really bad, and I was told that by an SCT Tuner, so I belive him. he told me that 05 GT are the way to go with blow thru.
So I went to VMP and saw that they have the 75MM, so as soon as I sell my LMAF I am buying that maf. Better be safe then sorry... Plus, I would like to have the tunes be smooth without any problems..

 

Its almost impossible to do a draw through twin turbo setup.

I am running blow through with a BA2800 meter with no extender. My car is making 700HP, and is around 950 MAF counts, so there is plenty left. Resolution is actually pretty good.

 

Here is my experience, without being biased...


I have ran blow through, and draw through on several different cars.
Both work, and seem to get the job done just fine. I've used Pro M's bullet meter, 80mm, stock meters, Lightning 90mm, PMAS HPX, and stock 05 GT, as well as coupled with the MAFIA.

IMO, for the most clean piping/maf setup, ease of tuning ( compitent tuner!) go blow through.

The only real advantage I see with draw through is a little more range of the meter, and ever so slight increase in boost on demand when shifting gears ( which really isnt an issue with most V8's) because of a recirculated air charge to compressor.

 

Not sure what the various setups being used and or discussed here are but I have seen the driveability differences that are gained by going from blow thru to draw setups.... Please don't get me wrong - I am not saying that the blow thru setups are junk and have ALL kinds of issues..... This is not what I am saying. BUT that being said if you area a daily driver type of guy and wants near stock driveability without any little hiccups(sp?) or the sometimes current low speed/RPM surging you get with the blow thru setups then I just plain have to say that the draw thru is the way to go in my humble opinion.

Used to work at a shop where there were several customers that would come in with all the right parts on their car but were fighting driveability issuesand most often they wanted to hear nothing of their blow thru setups being the major cause. BUT, several wold go ahead and let us convert to the draw thru setup and then after the fact could not describe not understand why the difference was so big...

I have seen 1st hand numerous times the gains (typically driveability) that were had by changing the system to a draw thru setup. Most we did wold use the SCT meter just downstream from the filter inlet - just like the factory maf is setup. Once that has been done then the only main hurdle is getting the blowoffs of recirc valves to release back into the inlet side of the maf.

Hope my worthless .02 helps....

Draw thru for he WIN IMHO!!

Dave

 

+1 the only way I can think of to do draw through with twin is to have a y pipe connecting the compressor inlets, or run a seperate computer for each bank of the engine each with it's own maf.

 

i've allwatys ran blow through setups on everything I have done. I guess it started because my 1st kits was twin turbo and so when I switched to a single I went with the same thing and the car runs great. While this is on a fox I'll be turboing my 01 mustang in the next couple weeks and I'm going to try a blow through setup on it 1st.

 

Thanks for all the inputs guys. Now.. My question is this: Should I stay with the LMAF (picture above) on a 3" pipe or should I change to the 75MM Blow-Through MAF that VMP Tunning sells?! After reading all of what you have said, many used different setups, MAF's, etc...