Originally Posted by chip-3door
Looks like i will be using ITBs on a blown motor im building.
Little worried about getting a reliable map reading as the way i see it, at part throttle on one cylinder it will see boost (valves closed) and on another it will see vacuum (asusming less air from boost past that part open throttle than the engine is consuming in vacuum on that cylinder)
So whats the best way to do it?
Im guessing on just using a balance pipe running beteen the 4 ITBs?
How do liners do it when they are getting a MAP reading?
I run ITB's on my bike and plumbed all four vacuum lines together (taken from the engine side of the throttle plates) and use a small restrictor jet in the single line that goes to my Map sensor. My MegaSquirt ECU uses revs and manifold pressure to calculate fuel and only uses TPS for Accel enrichment.
Mark