[drexchan]

"so I am back to the plan.. uprate the FPR to compensate for the
lean condition caused by the unmetered air (air that is not being sensed
by the MAF)"

doesn`t this sounds similar to what i already have?? but this gadget it
not adjustable.. your comment?

[Phibes]

OK my Diagram would look like this

http://www.imagestat.../?id=2135225879 (last Image .. This forum
album no work and can`t handle ASCII art ;-(


The air coming through the AIr Injector is unmetered by the MAF and gets
delivered ahead of the Intake Air charge it is adjustable but always lets
air in. My idea to richen the mixture by the FPR is to counteract the
leaning effect with Unmetered fuel. theoretically if I have an adjustable
Air injector and an Adjustable FPR .. I should be able to open them up
progressivly to get more power while keeping the A/F where I want it
(slightly rich as opposed to slightly lean) .. kinda like a poor mans 5th
injector ( a 5th injector effect without a forced induction). Without the
air injector I could just get rich upping the FPR, without the FPR I can
just get lean with the Air injector, with both adjustable devices I can
raise the bar to the engines capacity (either hit the wall on the
injectors, or the displacment or the air injector).

OK WHATS THE BEST ADJUSTABLE/AFFORDABLE JAPANESE AFTERMARKET FPR? Anyone?

Peace


Peace

[JakeG]

How do you balance the airflow from the Air Injector stream.. and the main
MAF-intake stream:
1) at idle
2) at WOT

[Phibes]

Basically I don't .. and I don't really need to.. after all the engine for
all it's sensors is still a mechanical device working on mechanical
principles , it sucks and bangs and blows - reload this thread and read my
last post as I just edited it with a proper diagram.. I don't care much
about idle but the air injector has resistence so even if I open it all
the way Idle does not get too rough .. it's the inbetween parts that is
more challenging when it gives so much unmetered air at part throttle that
it simply leans out too much and pings.. at WOT the amount of air
unmetered becomes much lower in volume considering the size of the air
injector and the relative size of the Intake system through the MAF and TB
the Lambda is open loop so it does not correct this except perhaps over
time.. but I find it pretty well consistant. Back to the solution of
countering the unmetered air with the unmetered fuel.


Peace

[Phibes]

IN addition to the above thought.. mine is a Variable intake manifold..
and the air injector is ahead of these butterflys.. the butterflys
probably do allot to control idle condition regardless of the air avalable
in front of them.

Peace

[drexchan]

Phibes,

I have tried something similar using a ball valve, a small filter and a
tee. The PCV hose is tee'ed to the valve then to the filter. We call it
the DIY microcompressor, which is basically an air injector by leaking.

Upon full valve opening, the idling rpm rise to about 2k. That is during
closed-loop operation. Revving the engine became much easier and the
pedal feels lighter.

I did encounter the pinging problem during part throttle and was thinking
of water vapour injection to lower the combustion temperature. But due to
my laziness, i decided to remove the mod.

My observations are:
1. with the valve opens wide - rough idling (like high cam) at +/- 2k.
Smooth acceleration but encountered pinging. Good FC especially during
highway cruising.

2. with the valve adjusted to smaller opening until the idling falls back
to normal (900rpm) - less effect was felt.

It makes me head-scratching on the tuning. So i abandoned the project.
But i am still keeping the stuff. Maybe with you feedback i can reuse it
and make some neccessary enhancements.

p/s: i have actually regreted on trusting the mechanic that sell me the
denso stuff which i shown above.

[drexchan]

so now i see the difference between your mod and mine. You have the
injector before the butterfly and I made it leaking directly into the
manifold.

have you ever thought of combining the air injector with a water vapor
injector? That sounds possible to me since water vapor would help
reducing the combustion temperature.

[Phibes]

Drex, no actually I have the Air injector connected directly to my manifold
and experience much the same conditions as you described, but instead of
trying to reduce the ping with water I will aim to reduce it with fuel as I
am after more power. The reason you get better FC is because you are
running lean.

I actually have an injector also on my Brake vacuum circuit as well so it
compounds the lean condition.

Do you have adjustable FPR? or an Adjustable Booster Type FPR?



Peace

[drexchan]

"Do you have adjustable FPR? or an Adjustable Booster Type FPR?"

No I don't but i am looking frward to have one in the near future.

"The reason you get better FC is because you are running lean."

Yes, I understand. I know that i can always add a adjustable FPR for the
purpose you are after for. Another option i have is a water-ethanol
mixture.

Anyway, did you experience any deteriorate in braking performance with
the air injector?

[drexchan]

Phibes,

I have some thoughts that MIGHT sound logical.

1. Injecting air, either directly into the manifold or before the
butterfly is just by-passing the MAF - we got it right.

2. The movement of the pistons and the throttle opening control how much
air is going to be drawn into the cylinder - we got it right.

3. Irregardance of how many intake `point` or `source` - the amount of
air being drawn into the cylinder is SOLELY dictate by 2. - did we missed
this?

So, when mixture became leaned due to the unmetered air (ECU was fooled),
we try to add more fuel to richen it. But we have forgotten that the
amount of air being drawn-in is still the same as how much the engine
would draw during perfect condition. - am i right?

Therefore, what we are trying to do (uprating the FPR so that the
injectors inject more fuel) is like manually correcting the error instead
of allowing the ECU to do so (we digged a hole then we cover it back).

Don`t you think so?

gosh!! I am scratching my head again..