You might have missed some info, but you're not to blame as it's spread over several threads;ptuomov wrote: ↑Mon Mar 26, 2018 10:49 amI don't think it's a good control system to feed the idle air from the vacuum canister to the intake port with a control valve in the middle. In fact, that's a terrible control system once you consider the operating modes. How's the control system suppose to predict the drop of the pressure insde the vacuum canister and stabilize idle? I wouldn't do that.mk e wrote: ↑Mon Mar 26, 2018 10:04 amThe hoses connect on the engine side of the TB and the check valve allow follow toward to engine so in theory it can work.
In practice allowing the pcv and iac flow into the chamber will drop the vacuum available to the brakes, but I guess he's already got an electric vacuum pump so that will still work...but separating the systems might eliminate the need for the vacuum pump.
As an atlernative arrangement, allowing the IAC to bleed air into the vacuum canister defeats the whole point of having a vacuum canister. To first order, the IAC is going to attempt to regulate the vacuum canister pressure to some level that runs the idle well, which is likely not the level of vacuum that one wants to power vacuum operated devices. That's in my opinion another ill advised control system.
Instead, I'd just have a single hose inlet from the air box (post filter) to a IAC and then a manifold to distribute the idle air to inlets between each throttle blade and intake valve. I assume each throttle body has some idle adjustability one way or another, and the pressure measurement from the vacuum signal ports can be used to equalize the air flow to each of the cylinders.
Each throttle body is going to need three ports between the throttle blade and intake valve. First, the signal vacuum. Second, the power vacuum. Third, idle controller bleed. Need is a strong word, of course. I don't think one "needs" a controlled idle, one could just tune the idle with the screws like in the old times. One could also just use a pump for power vacuum. But I'm sure you're getting my point.
Previous setup :
airboxes =>IAC valve=>vacuum Chamber.
PCV +brakes (with one way valve)=>vacuum chamber
MAP and FPR connected to vacuum chamber.
Runners had a hole in them to connect them to the vacuum chamber.
Current setup :
airboxes=>IAC valve=> vacuum reservoir=>one way valve=>runners
pcv+brakes (with one way valve)=>vacuum reservoir=>same one way valves=>runners.
Runners=>map and FPR
The reason why I need the reservoir is I need something to distribute the iac and pcv air evenly.