TURBO819

iTrader: (5)

My plans are to place the MAF sensor in the pipe after the Blow Off Valve about 8" to 10" before the Throttle Body.

My reasons for wanting to try the Blow Through Set-Up.
- Accurate Metering
- Actual Air Temperature Going into the Engine
- Not having to Recirculate the Blow Off Valve


I Found this on Another Web Site

Blow Through Pros
- Fastest A/F Ratio Changes
- More Accurate
- Eliminates 99% of Idle Problems
- Meters Exactly how much Air is Going into the Motor, not how much is in the Intake.
- Easier to use Blow Off Valve
- Can use Atmospheric Blow Off Valve
- Totally Eliminates Recirculation Setups

Blow Through Cons.
- MAF more Prone to Heat Soak (can be minimized by using a good intercooler)
- If not Properly Placed on the Intake Side can cause Hesitation in Motor.
- Can be hard to hook up.
- Can get Oil in MAF from SuperCharger / Turbo Leakage.
- Can't use certain Methanol Injection Kits


Questions
- Who has Used this Set-Up???
- What's the Best Placement of the MAF before the Throttle Body???
- What's the Best Placement of the Blow Off Valve before the MAF???
- Any Likes or Dislikes???
- Any Tuning Issues???
- Any Idle Issues???
- Should a Breather Filter (Valve Cover) or a Catch Can be used to Reduce MAF Sensor Oil Contamination???

Cablendz

whats the average cost for an MAF sensor???

1sxyrxy

plenty of people do it, but your very limited, to about 300ish hp from what i recall. also makes it very easy to tune, just have to tune for boost.

1sxyrxy

you should register on clubna-t. if you are take a look there. there is alot of information for blow through
http://forum.clubna-t.com/showthread...ht=blowthrough

turbodremz

iTrader: (18)

why not find a VVT-i JDM GTE ecu and just eliminate the MAF and run MAP?

and blow through setups have been used for several turbo applications, I know AKA Paco's RSP is setup to blow through for one SC example, but there are several members running that way very successfully. Just keep in mind that the maf can only meter so much air before maxing out the possible voltage reading.

TURBO819

iTrader: (5)

Thanks for the information. I am going to see if I can find some more information on their sey-up. I have the 2jzgte vvti ECU. The 2jzgte uses the MAF as well as the MAP.

TURBO819

iTrader: (5)

I am going to check out that link. Good Looking.

turbodremz

iTrader: (18)

really?? Cause I have never seen a JDM GTE use an MAF. I know the USDM GTE's do, but this is the first I have heard a JDM using the MAF and first I have heard of a 2JZ using both MAF and MAP metering systems in pair.

TURBO819

iTrader: (5)

My SCxxx
http://www.youtube.com/watch?v=qLP0O90wwfU
http://www.youtube.com/watch?v=6quvP---MKk
See the 6:00 Mark
http://www.youtube.com/watch?v=qAP8C...next=1&index=5

turbodremz

iTrader: (18)

hmm, must be a VVT-i thing. Glad I never went with a vvti. I would go to clubna-t.com and see if there is any relevant info there, but you may also want to try supraforums.com seeing as how they are IMO the #1 source for GTE information.

and thanks for the vids, I learned something new today.

TURBO819

iTrader: (5)

I was having a stalling problem because I placed the BOV on the cold side of the intercooler pipe (Throttle Body) not recirculated. To solve that problem. I just need to move the BOV to the hot side of the intercooler piping and recirculate it. I also wanted to use 4" piping for the inducer side of the Turbo. I was unable to use it because of the MAF being pressure sensitive / Calibrated for 3" piping. When I installed the 4" piping to my SCxxx. The car would not start or it would stall out after one compression cycle. I was just looking to the Blow Through Method for a cleaner install with 4" Piping, MAF install by the Throttle Body & the BOV hidden on the Hot side of the intercooler piping. The strange thing is if you look at the video clip you would see that my SCxxx is running with the 4" piping for the first few Start-Up

http://www.youtube.com/watch?v=tp-xVplrUos

Ali SC3

iTrader: (10)

the jdm vvti uses a hotwire maf. the rest of the jdm's use map sensors.

check out my vid, I used to run in blowthrough with an safc. it worked, stalled alot less, but in partial boost it can act funny.
http://www.youtube.com/watch?v=ppveAzduYUw

with the maf before the turbo, you still know how much air went by (if you have no leaks / VTA BOV) cause there is no boost ever here and the maf can read regular airflow just fine.

with the Karman maf in blowthrough, it basically cant detect any boost and just sees airflow past it, so you have to tune for your fuel for the max amount of boost.
So in partial boost even accidentally (like going up hill) the ecu really has no idea how much air is in there and can have issues sometimes especially if you are still in closed loop, and with the way 2jz's spool turbos i found myself in partial boost quite a bit during regular driving. reset your ecu often if you go down this path.

If you have a hotwire maf, by all means switch to blowthrough and see if it helps out, these mafs will actually react to boost somewhat in the blow through configuration as in it will detect more airflow. These should have less driveability problems than the odb1 sc karman maf, and should work good enough.