Not Stock

I'm getting a haltech E11 and my tuner wants to run sequential injection. Question
is, can you get better fuel economy from this? What is the advantage of this, and
if we run 4, 1600cc injectors can we make it idle fine?

BLUE TII

iTrader: (9)

You should try this in the Haltech area of the forum.

I have "heard" sequential injection on the rotary does not make that much of a difference. This may be bacause of the presence of strong reversion charges in the intake manifold? I have seen fuel varnishing very far upstream of the injectors in the manifold runners.

When you set up the sequential injection try many set points. Perhaps you can get a good effect if you delay the injection a bit after the intake port opens as there is a strong reversion when high pressure exhaust escapes out the intake port as it opens. Stock, the intake chamber expands for 32 degrees open to exhaust (sucking it in) before it opens for intake.

Mazda used this exhaust into intake reversion pulse and the pulse from the intake port suddenly closing to "supercharge" the intake at the opposing port (nearly 2psi on 6 port 13B).

I think the exhaust reversion pulse as intake opens will have a FAR greater effect than the intake port closing at low rpms and idle as the intake air charge does not have much inertia yet to cause reversion as the port closes, but the exhaust pressure will be much higher than the intake pressure as the port opens.

That is why I mention it may be benificial to delay the injection if there is any benifit to be had by sequential injection at all.

As for the four 1600cc injectiors.

I know the old E6K couldn't controll the standard pintle style 1600cc well enough for idle/low rpm. I don't know if Haltech improved the injector drivers for the E6X or E11 or if they could controll a disc style injector much better. I tried running my 720cc and 1600cc injectors all at once w/ the E6K and it did actually idle fine as the 1600 wouldn't even open at that low a duty cycle, but it wouldn't run well at all as the duty cycles went up and the 1600s started actually opening. Rich bog, popping and flames out the back even at cruise.

RETed

Yes, approximately 10% to 15% better efficiency.


Why you insisting on running all 1600's?
That's enough fuel for over 700hp?


-Ted

BLUE TII

iTrader: (9)

Yes, approximately 10% to 15% better efficiency.


Awsome! Ted, what kind of mileage do you think one could get out of a 20B w/ E11 V2 doing sequential inj. if driving like a grandma and running lean? I was thinking of a 20B as my next engine so I could get more life out of it abusing it w/ bad tuning and bad driving.

RETed

We already get 15mpg on our 20B NA car right now, and the owner doesn't hold back!
It has no turbos, but to get 15mpg on mixed city / highway driving is a nice surprise, cause it's running off a E6K.

An E11V2 is going to be swapped into the the 20B very soon, as we just got the E11V1 replaced by Haltech, and it came in a few days ago.


-Ted

BLUE TII

iTrader: (9)

That is good!!

I was getting 17 mpg driving fast but smooth on Mnt rds on my 13BT only 23-25 mpg on the freeway and 5-10 mpg f*%$king off with it.

Hmm, 20B w/ ceremet coatings and sequential inj. Since we can do sequential injection w/ E11 maybe bore out the oil injector passages for primary fuel injectors?

Evil Aviator

I think the 10-15% gain is a bit optimistic, except at the lower rpm's. Normally, you would be lucky to get a 5% gain at peak hp.

What settings are you guys using to get 10-15% gain? Also, after tuning the engine, have you tried disabling the SFI function to see what the dyno says?

BLUE TII

iTrader: (9)

I think Ted is talking about % gain in MPG running lean as you can at cruise before surging and you are talking about HP gain from sequential injection.

Correct me if I am wrong guys.

Evil Aviator

Good point. The word "efficiency" is rather vague.

RETed

Yeah, sorry about that.
I got a cold I'm trying to shake, and it's screwing my brain up.

I can easily tune an E6K to produce 15mpg on mixed driving on a 13BT no problem.
With the E11, I can get 17mpg no problem.
It's a very small data point, but it's just about 10%.

I think the 15% number was taken from some book - maybe Corky Bell?


-Ted

Not Stock

Great info. guys, thanks. My tuner runs 1600s all the way around and has
good idle and driveability. He likes top feed- I guess the 850s are side
feed. As for the e11, I mainly wanted windows based software and the
option of a 3rotor someday. I also looked into the microtech but wanted
to run msd ignition so e11 seemed the best bet.