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I feel you there. However I regret to inform you, you don't have a fresh air side hooked up. Both of those spots are under vacuum because they are behind the blade, in the manifold. You have to find a way to hook one somewhere in front of the blade so the engine has fresh air. It's weird your TB doesn't have a spot for this.
I feel you there. However I regret to inform you, you don't have a fresh air side hooked up. Both of those spots are under vacuum because they are behind the blade, in the manifold. You have to find a way to hook one somewhere in front of the blade so the engine has fresh air. It's weird your TB doesn't have a spot for this.
whats the easiest way to go about this? Surely someone else is using one of these truck throttle bodies? Or would it be easier just getting another TB although I already have my tac module/pedal assembly so looking for another that would work with it all might introduce more complications.
whats the easiest way to go about this? Surely someone else is using one of these truck throttle bodies? Or would it be easier just getting another TB although I already have my tac module/pedal assembly so looking for another that would work with it all might introduce more complications.
That's why I was looking up things like vented/filtered oil caps as a possible solution. I think you could get away with it as is honestly. I do on mine and I don't have fresh air, but I am also pulling -15 inches of atmosphere out too, or about -7 psi. Depending on the cam you're running, hard to say what your intake will pull. It will be fine at idle, but at RPM you pull a lot less vacuum, when ironically that's when you need more. Fresh air coming in helps push all that out creating a "flow". Most people run some sort of catch can because all of that oil will dump right into your intake.
I wouldn't change the TB. I'd look at much simpler solutions, like maybe a ring with a tube in it right behind the MAF or in front of the TB. So long as that air is coming from somewhere BEFORE the throttle blade, it's positive pressure, not vacuum. Everything behind the blade is vacuum. You could put it farther upstream too. So long as it's filtered air.
That's why I was looking up things like vented/filtered oil caps as a possible solution. I think you could get away with it as is honestly. I do on mine and I don't have fresh air, but I am also pulling -15 inches of atmosphere out too, or about -7 psi. Depending on the cam you're running, hard to say what your intake will pull. It will be fine at idle, but at RPM you pull a lot less vacuum, when ironically that's when you need more. Fresh air coming in helps push all that out creating a "flow". Most people run some sort of catch can because all of that oil will dump right into your intake.
I wouldn't change the TB. I'd look at much simpler solutions, like maybe a ring with a tube in it right behind the MAF or in front of the TB. So long as that air is coming from somewhere BEFORE the throttle blade, it's positive pressure, not vacuum. Everything behind the blade is vacuum. You could put it farther upstream too. So long as it's filtered air.
Does everyone else avoids the truck dbw throttle bodies? Wish I would’ve just gone dbc since I still have to fab something to get the truck pedal to work in the car. I’ve been searching and can’t even find anything on others using the truck Tb.
The first picture looks like your EVAP hookup for the tank. I could be wrong though, but that's where it is on my FAST. Should be a click on for the EVAP line, not PCV. The vacuum for the PCV comes from the valley cover on the passenger side just behind the TB, and hooks to the passenger side of the intake, that's the vacuum "in". Fresh air should be routed from the hookups on the throttle body (aka + pressure source, not vacuum) for fresh air ventilation, or air "out". The stock line for fresh air go to both valve covers, then the TB on a junction/t style. I don't remember which way it routes, but iirc, it goes from the drivers side around the back, into the passenger side and to the TB on passenger side.
I know I have a bit of a different setup here, but you can see the EVAP can hooked up on D/S, the fresh air outlet on TB as well as fresh air hookup on P/S valve cover. Mine are capped off though, because I'm using a vacuum pump.
↑↑↑↑↑↑This setup right here is the way to go↑↑↑↑↑↑
Well done! My plan is to go with a vacuum pump at some point but for now it's just 10AN lines off each valve cover to a breather can.
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