G
Guest
·Well, I can tell you all about it now. I succesfully have a "blow through" MAF setup on my car. What this means is the MAF is mounted in the tubing between the turbo and the motor. In my case, after the intercooler, about halfway between the intercooler and the throttle body. To get this to work, you need to run a hose from the idle motor to a hose nipple between the MAF and throttle butterfly. For me, I removed my throttle body and had the traction throttle butterfly removed, one side plugged, and had a 3/4" hose nipple connection welded on there. A hose runs from there to the idle motor. Heavy duty heater hose works fine, and can take 50psi with no problem. The BOV should be somewhere before the MAF, in my case, the BOV is immediately after the intercooler. If yours is right next to the turbo, that will work fine too. The wires for the MAF will reach over there if you take off the sleaves for the wiring, to about mid way across the front of the motor (where wire bundle crosses right above the cam gears). So far, it works great. So the trick is (arrows indicate airflow):
Turbo->BOV->MAF->connection for idle motor->throttle butterfly (rear one, the one you control with the gas pedal)
Advantages:
1. HP Limitation: When on the pressure side, the MAF offers no restriction to HP, at least up to 800RWHP. Why? A vessel that starts to be a restriction at 400-450RWHP when at 0psi (stock MAF operation), can flow double with no restriction at 14.7psi, and triple at 29.4psi. So unless you make 800HP at 14.7psi, no worries.
2. Price: Costs almost nothing. Just some changes to your intercooler tubing.
3. BOV operation. Since the BOV is before the MAF, all the problems with open-air BOVs and the MAF are gone. Any air that passes through the MAF is going to the motor.
4. Accuracy: MAF systems are more accurate at metering air than speed-density (MAP) systems, like the VPC.
If anyone is interested in doing this, the intercooler tubing is up to you. Place it where you like, but I recommend AFTER the intercooler (for heat reasons). I can tell you the in side of the MAF is 3", and the out side is about 3 3/8".
I can help you with the throttle body. I'm not sure what the price will be, probably $130 I think. For that I will have the traction butterfly completely removed, one hole sealed, and the other hole enlarged and used for the hose nipple for the idle motor. Considering it's $95 for a traction removal kit anyway, I think thats a deal.
This will not be like the MAF dual pipe deal. I don't need a group for this to work, I can do them one at a time if need be.
Turbo->BOV->MAF->connection for idle motor->throttle butterfly (rear one, the one you control with the gas pedal)
Advantages:
1. HP Limitation: When on the pressure side, the MAF offers no restriction to HP, at least up to 800RWHP. Why? A vessel that starts to be a restriction at 400-450RWHP when at 0psi (stock MAF operation), can flow double with no restriction at 14.7psi, and triple at 29.4psi. So unless you make 800HP at 14.7psi, no worries.
2. Price: Costs almost nothing. Just some changes to your intercooler tubing.
3. BOV operation. Since the BOV is before the MAF, all the problems with open-air BOVs and the MAF are gone. Any air that passes through the MAF is going to the motor.
4. Accuracy: MAF systems are more accurate at metering air than speed-density (MAP) systems, like the VPC.
If anyone is interested in doing this, the intercooler tubing is up to you. Place it where you like, but I recommend AFTER the intercooler (for heat reasons). I can tell you the in side of the MAF is 3", and the out side is about 3 3/8".
I can help you with the throttle body. I'm not sure what the price will be, probably $130 I think. For that I will have the traction butterfly completely removed, one hole sealed, and the other hole enlarged and used for the hose nipple for the idle motor. Considering it's $95 for a traction removal kit anyway, I think thats a deal.
This will not be like the MAF dual pipe deal. I don't need a group for this to work, I can do them one at a time if need be.