MAF before forced air, or after?

[Jonny Cash]

Test fitting everything, and getting everything together for my blower car, Im curious about this because I see so many different kinds of setups. The kit was originally setup after the forced air literally kissing the throttle body

It would be obvious to set it up before the forced air... But then again the MAF reads airflow and delivers fuel accordingly, so it wouldnt make that much of a difference.

Thinking about it some more, I realize that the air before and after is really moving at approx. the same speed, with the only difference being pressurized and non-pressurized. Wouldnt it be better to set it up before?

 

[SLoW_SHO_316]

I'm no boosted SHO expert, but I would figure that a big draw through MAF would be best.

 

[SHO92]

Putting the MAF before the blower would be optimal, but guys with the SHO SHOP kits have found that tuning it this way is near impossible do to the huge length of tubing between the blower and the TB.

Doug Lewis has the MAF before the blower on his kit. The ~8" of total piping between the blower and TB probably helps in his case.

 

[twr]

...

Thinking about it some more, I realize that the air before and after is really moving at approx. the same speed, with the only difference being pressurized and non-pressurized. Wouldnt it be better to set it up before?

Ideally yes. However as stated above, the volume of the charge pipe is such that the MAF still registers a flow and will peg out rich at closed throttle/high rpm.

As far as the speed and density (pressure) of air, there actually is a difference when you increase the density of air. The air being drawn through the MAF is moving pretty fast at 14.3psi (1 atmosphere) the pressurized charge is (say 9 + 14.3psi) moving slower. It's all fluid dynamics and a couple of laws of physics. The amount of air drawn in pre-blower has to equal the amount of air post blower.

 

[TYSHO]

Test fitting everything, and getting everything together for my blower car, Im curious about this because I see so many different kinds of setups. The kit was originally setup after the forced air literally kissing the throttle body

Glad to see that you are getting closer. I wish my parts delivery delay can come through so I can finish this month.

 

[Jonny Cash]

So considering my 2 miles of piping, I should put it after i guess. I really didnt want to do it one way and then switch it, because relocating the plug to the pass. side will be kinda fishy as far as splicing wires.. I really didnt want a tuning nightmare....well see what happens.

So now that you think I should put it after the blower, how far away from the throttlebody should I go?

ty, Im glad too. I talked the talk for so long, it was only right I backed it up. All the mods Ive been doing in the past 6 months have led up to this. Now its finnally time.

 

[yamahaSHO]

So considering my 2 miles of piping, I should put it after i guess. I really didnt want to do it one way and then switch it, because relocating the plug to the pass. side will be kinda fishy as far as splicing wires.. I really didnt want a tuning nightmare....well see what happens.

So now that you think I should put it after the blower, how far away from the throttlebody should I go?

ty, Im glad too. I talked the talk for so long, it was only right I backed it up. All the mods Ive been doing in the past 6 months have led up to this. Now its finnally time.

Ideally you want a straight entrance and exit for the MAF. If you notice the SS setup, there is a fairly straight pipe before and after the MAF. Place it accordingly at your own discretion.

Adding more wire for the MAF connector is easy... Cut, strip, clean (flux), solder, and shrink wrap. With the TwEECer, it is easy to make any connections. I've got a OBDII connector spliced into mine with about 4 extra feet of wire (from when I had the MAF pre-blower) and tuning is not difficult.

 

[MYSHO1]

So considering my 2 miles of piping, I should put it after i guess. I really didnt want to do it one way and then switch it, because relocating the plug to the pass. side will be kinda fishy as far as splicing wires.. I really didnt want a tuning nightmare....well see what happens.

So now that you think I should put it after the blower, how far away from the throttlebody should I go?

ty, Im glad too. I talked the talk for so long, it was only right I backed it up. All the mods Ive been doing in the past 6 months have led up to this. Now its finnally time.

Jay im heading back to RI soon, call my phone if i dont pick up leave a message with your number... Mine went for a swim.

 

[adidas_kn]

So should the MAF be easier to tune in the suck or blow setup? I will need to know soon.

 

[yamahaSHO]

Please read all the information already posted and determine for yourself. In addition, I KNOW the search function will yield results as well as I've already discussed this, as well has Terry in the past.

 

[Axianator]

So should the MAF be easier to tune in the suck or blow setup? I will need to know soon.

The answer to this primarily depends on the type of MAF that you plan to utilize. As Terry and Jason have noted, a properly-placed draw-through MAF (like an 80mm or 90mm Lightning MAF that is placed pre-blower) will often yield the best tunability.

 

[adidas_kn]

90mm Lightning will be utilized so the draw through will have to do.