Tim Moland
Well-Known Member
My car came with the RPD boost gauge. I was not a fan, so I am going with a mechanical style gauge. Does anyone know which vacuum hose to hook up the boost line to? The lnf has many hoses on it. Lol
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Really! That seems odd to me. Of course I know nothing about it. Would that mean that the brake booster receives more pressure while the turbo is "boosting"? As far as the pod goes, it's kinda gimmicky. I drove my car for a year and a half and only had the boost gauge on display the whole time I have read that the accuracy is questionable. It only shows boost, no vacuum. I wanted something a little more compact for the goblin. Kinda looks out of place.You should be able to tee off the line that the brake booster hooks up to. Just out of curiosity, what is wrong with the digital RPD gauge pod?
That's true, but there is a difference between "before throttle" and "after throttle". You want to display the "after throttle" - aka manifold pressure - on a boost gauge. The line to the brake booster is connected to the intake manifold, so that works fine.The entire intake system from the turbo outlet all the way to the cylinder is pressurized under boost. When you let off the throttle, that same path goes to vacuum.
No, the fitting where the hose connects to the brake booster is a check valve, so it only opens under vacuum, while positive pressure forces it closed.Really! That seems odd to me. Of course I know nothing about it. Would that mean that the brake booster receives more pressure while the turbo is "boosting"?
OH ok, that makes sense.That's true, but there is a difference between "before throttle" and "after throttle". You want to display the "after throttle" - aka manifold pressure - on a boost gauge. The line to the brake booster is connected to the intake manifold, so that works fine.
No, the fitting where the hose connects to the brake booster is a check valve, so it only opens under vacuum, while positive pressure forces it closed.