Drawing through MAF instead of blowing through
Drawing through MAF instead of blowing through since my car is a hybrid i have a bit of room to be creative with teh install.
i was wondering if there would be any advantage to drawing through the MAF vs the traditional blowing through it? is there a certain distance the MAF has to be away from teh engine or a max distance it can be from teh TB before it starts to read incorrectly?
i know i can make a much cleaner looking install with the MAF relo'ed into the nose where i plan to draw air from.
thanks
tim
i was wondering if there would be any advantage to drawing through the MAF vs the traditional blowing through it? is there a certain distance the MAF has to be away from teh engine or a max distance it can be from teh TB before it starts to read incorrectly?
i know i can make a much cleaner looking install with the MAF relo'ed into the nose where i plan to draw air from.
thanks
tim
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Joined: Nov 2001
Posts: 1,190
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From: Las Cruces, NM
Originally Posted by NJSPDER
since my car is a hybrid i have a bit of room to be creative with teh install.
i was wondering if there would be any advantage to drawing through the MAF vs the traditional blowing through it? is there a certain distance the MAF has to be away from teh engine or a max distance it can be from teh TB before it starts to read incorrectly?
i know i can make a much cleaner looking install with the MAF relo'ed into the nose where i plan to draw air from.
thanks
tim
i was wondering if there would be any advantage to drawing through the MAF vs the traditional blowing through it? is there a certain distance the MAF has to be away from teh engine or a max distance it can be from teh TB before it starts to read incorrectly?
i know i can make a much cleaner looking install with the MAF relo'ed into the nose where i plan to draw air from.
thanks
tim
The maf will read correctly either blowthrough or draw through - it measures the mass flow. The farther away from the throttle body you are with the maf the longer it takes realize something has changed. Blow through is also good if you have a blow-off valve since the car won't go rich when it pops.
Gary
thanks guys.
gary, what woudl change between the maf adn teh motor on a draw through set up? the intake air temp?
is this the kind of thing i coudl easily use hptuners to compensate for?
thanks
tim
gary, what woudl change between the maf adn teh motor on a draw through set up? the intake air temp?
is this the kind of thing i coudl easily use hptuners to compensate for?
thanks
tim
TECH Fanatic
Joined: Nov 2001
Posts: 1,190
Likes: 0
From: Las Cruces, NM
Originally Posted by NJSPDER
thanks guys.
gary, what woudl change between the maf adn teh motor on a draw through set up? the intake air temp?
is this the kind of thing i coudl easily use hptuners to compensate for?
thanks
tim
gary, what woudl change between the maf adn teh motor on a draw through set up? the intake air temp?
is this the kind of thing i coudl easily use hptuners to compensate for?
thanks
tim
Gary
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Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
Originally Posted by red ws6 99
The maf will read correctly either blowthrough or draw through - it measures the mass flow. The farther away from the throttle body you are with the maf the longer it takes realize something has changed. Blow through is also good if you have a blow-off valve since the car won't go rich when it pops.
Gary
Gary
ATI, MAF at stock location has higher LTFT's than in pull-thru.
I didn't believe it until the guy claiming this had me do it. I had to modify the MAF tables to get zero/neg LTFT's. I was able to get zero just using the IFR table after making it pull-thru and the car idles MUCH better, too. The con is I lose about a lb of boost.
Something still must be said for having the MAF right before the Throttle body. The throttle response is amazing... I like the fact you can have a blow off valve VS a routing it back to the intake side of the charger. 2nd, having the BOV back to the intake of the blower re-routes hot air into the blower and it's like a heating oven. We would see IAC, intake temps reach 130 to 140 just sitting there idleing in traffic for 10 to 20 minutes in 80 deg weather outside. Went to a BOV setup, or the ATI surge valve blowing off to the outside air and the intake temps dropped a lot! I have never had problems with getting a hold of the L-Trims, problems tuning. Just change the MAF or Injector tables and the L-Trims react accordingly. Idle is fine also, Choppy on my car 
We have a project 396 Stroked LT1 going on right now with a over spun D-1SC feeding it. The ATI kit came with the MAF positioned as a draw through setup. We would get hesatation and slow to react throttle response. We cwitched it to a push through setup and never had an issue.
I just like to see the MAF reading exactly what goes into the engine, and having it right in front of the throttle body is the best place. If Black LS1 TA, who I have talked to in the past, great guy and really knows his stuff. If a draw through is working for him, thats great... I just think a push through is better for the above statements, and I'm sure there are more.
Just my 2 cents.
Clint
We have a project 396 Stroked LT1 going on right now with a over spun D-1SC feeding it. The ATI kit came with the MAF positioned as a draw through setup. We would get hesatation and slow to react throttle response. We cwitched it to a push through setup and never had an issue.
I just like to see the MAF reading exactly what goes into the engine, and having it right in front of the throttle body is the best place. If Black LS1 TA, who I have talked to in the past, great guy and really knows his stuff. If a draw through is working for him, thats great... I just think a push through is better for the above statements, and I'm sure there are more.
Just my 2 cents.
Clint
