Re: Individual Throttle Bodies aka ITBs
Posted: Mon Jul 12, 2010 9:20 pm
Ah ok. I got an Eagle manifold lying around actually. It is just a very tiny piece of aluminium with a vacuum chamber in it... I think around 10ml, 10 cm by 1 cm in size approximatly. You can connect up to 4 (or 5?) small vacuum lines and 2 medium vacuum lines both on a T-splitter.
Normally ITB's have 4 small vacuum lines as well on all 4 throttle bodies. So connect those to the vacuum manifold leaving out one empty small slot on this manifold. Do this by using small T-plitters or anything. The big vacuum hoses should be used for the brake-cyl and carter ventilation. Though the last one I am not sure if it is smart since oil could block the hoses easy. Perhaps do not connect carter ventilation at all and make a seperate circuit for it (needed/how?).
Put the map on the last available small slot. This is how I should do it, but never did it actually. I suspect all sound pulses would cancel out a little when reaching the MAP sensor so you should have some descent signal. I know in practise that most people end up using TPS mappings instead of MAP mappings since MAP signal is has too much pressure fluctuations on it. No idea how these people connect there vacuum manifold if any...
Normally ITB's have 4 small vacuum lines as well on all 4 throttle bodies. So connect those to the vacuum manifold leaving out one empty small slot on this manifold. Do this by using small T-plitters or anything. The big vacuum hoses should be used for the brake-cyl and carter ventilation. Though the last one I am not sure if it is smart since oil could block the hoses easy. Perhaps do not connect carter ventilation at all and make a seperate circuit for it (needed/how?).
Put the map on the last available small slot. This is how I should do it, but never did it actually. I suspect all sound pulses would cancel out a little when reaching the MAP sensor so you should have some descent signal. I know in practise that most people end up using TPS mappings instead of MAP mappings since MAP signal is has too much pressure fluctuations on it. No idea how these people connect there vacuum manifold if any...