Ive been a lurker here on MT for a while and decided it was about time to contribute something. So here goes....
It started off as a bit of day dreaming stuck behind my desk at work but the more I thought about it the more sense it made. "Doesn't that long vaccume line between the manifold and MS cause some lag?"
So I got out my slide rule and pencil and did a "back of a beer mat calculation"
As I understand the wavefront from the manifold to the MAP should move at the speed of sound (assuming that the transition is from full vaccum to WOT) at sealevel. Approx = 340 m/s
Most people use about 5 feet of vaccum hose = 1.52 meters
Speed = Distance/Time Time = Distance/Speed
1.52/340 = 0.00447.......... round up to 0.005 seconds or 5 milliseconds.
Doesn't seem like much but when MS is sensitive to 1ms values for things like injector opening time it starts to sound significant.
Would mounting the MAP in the engine bay as close to the manifold as possible reduce that lag and make using MAP based acceleration enrichments more accurate for a nice crisp throttle responce?
Has anyone tried it? Would anyone be interested in trying it? My MS is still in bits at the suppliers (coz I aint ordered it yet
) but as soon as I have it I'll give it a go.
PS Im very sorry if this has been asked before but I did have a search and a read before posting. Honest SamNavy!!!