Which are the primary and which are the secondary on the intake?


Bill

The two holes in the center housing are the primary intake.


Paul Lamar

Paul, Don't  I remember you saying something to the effect, "These red ones
are useless for our purposes."  after doing injector testing?  If this is
true, what should we be changing to?  Is a change just a matter of remove,
replace?

Bill Bradburry

Probably for a p-port. Depends on the manifold. Might be OK for
a 200 HP RX8 engine.

Paul Lamar

The Japanese RX8 car develops 188kw using one red and two yellow injectors.
So where is the problem?

Ian Beadle

Lets see 188,000 watts divided by 746 watts per HP is 252 HP.
That obviously is the high power six port RX8 engine. The high power
(238 HP) six port RX8 engine in the US has FOUR yellow and two red injectors.
One for each intake runner. Six total. Only the low power (198 HP) automatic transmission four port RX8  engine in the US has two red and two blue injectors. Again, one for each runner. The red injectors are used on the center housing
primary and the four yellow are used on the end housing secondaries.

My suggestion is use just the four yellow injectors which is compatible
with Tracy's EFI/IGN computer. That computer has only four solid state
injector drivers.

Paul Lamar


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