Brain Fart ? - Lean#6 RB26 Helper ?

[JD74]

You might think I just hit my head...because this even sounds a little odd to me, now that I am actually typing it. There are quite a few custom setups that use supplimentary injection in similar ways.

Why couldn't one tune with a '7th' Injector firing at the inlet of the Plenum on an OEM "bung'd" Intake Manifold to help out (a bit) with the lean condition and 'stacked up air' that is experienced by Cylinder #6 in an RB26 using an OEM manifold ? (rather than just richening #6 only)....

Anyone with an aftermarket ECU that has a spare driver could accomplish this.....right ?

Additional Injector Driver capable ECU, plus, maybe something like a single 440cc OEM injector (since they are always readilly available) ?. Just something to help even things out a bit ?

I realize this is probably completely retarded sounding, as you might as well just tune #6 richer to compensate (as you will need to anyways).

BUT, could this have any positive affect on things ? at all ?

If budget doesn't allow you to run a proper Plenum, something like this could be better than nothing at all, no ?

[DeviantRebel442]

seems like a interesting point...but i dont think it would work...in the plenum it would affect all the cylinders...and all would have to be retuned and then regardless the #6 would be different then the rest....or at least thats how i see it...

just resets everything...its like breaking something and then taping it...it works but its still broken...

and the way i see it...ultimately trying to set that up would be a waste...retuning #6 a little bit is A HELLA lot cheaper then buying a specific ECU and all for an extra injector...

[Kras]

if you are this concerned about lean #6 maybe you should drop some cash on a Nismo Plenum - we all know how much you like spending large sums of money on things that might not have any possible benefit haha

seriously though I don't think it is that big of a deal, with good tuning and putting the highest flowing injector @ #6 i think everything will be ok in that aspect.

[mcfly]

You don't need a whole injector worth of fuel on 6. You can just adjust the injector on 6 slightly and push 3% extra fuel into there if you are really worried.

Or if you buy a motec you can tune each cylinder individually.

[Terrh]

if you have flowtested injectors theres probably going to be a 3% difference between the biggest and smallest. Just throw the big one in #6.

[JD74]

we all know how much you like spending large sums of money on things that might not have any possible benefit haha.

Well then....please share your knowledge of my shopping list Einstein, since you seem to have it all figured out ?
Enlighten Me.

[Kras]

Well then....please share your knowledge of my shopping list Einstein, since you seem to have it all figured out ?
Enlighten Me.

Sorry - sarcasm doesn't translate well in text form.

I've just read a fair amount of your posts regarding overpriced JDM parts... which I happen to agree with.

[JD74]

Sorry - sarcasm doesn't translate well in text form..

So I can stop gritting my teeth then ?.....lol

[JD74]

In all fairness though, you are partially correct....guess that's why I reacted....LOL

I will reflect a partial appology back to you for snapping back at ya

Have Spent/Currently Spending too much on:
--------------------------------------------
- External Oil Pump and Lube/Cooling System.
- RIPS Oil Pan.
- Enough Sensors and Gadgets for my ECU setup to make 'KITT from Knight Rider' Envious...lol

I am just paranoid as sh1t....and I would honestly CRY if this project went up in a clowd of smoke (or similar), due to the cash being invested.

--------------------------------------------------------------------------

Clarification for the '7th Injector' idea:
=============================
It would benefit EVERY lean Cylinder, not only #6.
In THIS case, where there was EXTRA Air...it would have fuel atomized in it atleast

Not at #6......at the entry of the plenum, as I initially said up top.

Anyways,
That is all for now...lol
Allan

[Kras]

So I can stop gritting my teeth then ?.....lol

errm yes, don't hurt yourself lol

but anyways, I'm going to make an attempt to get back on topic by stating that I don't think adding an extra injector at the plenum would accomplish extra richening of the #6 cylinder; I think it would just increase the fuel into all cylinders

[JD74]

Well, I agree with you, but I think there is still a debate to help the original point.

Yes It will richen all of the Cylinders, but will have the MOST effect on the Cylinders that are typically over run with too much Air and therefore usually LEAN (thanks to fuel that has already been atomized in THAT air).

Kinda like going back in time from Direct Port EFI to Throttle Body Injection.

[Kras]

Yea, I see what you're saying. I personally don't know of anyone who's tried it though.

I just think that there are simpler ways to achieve the same effect.

[kev]

It's been done already.
An HKS AIC is what you are after. It utilizes an injector bung in the boost pipe post intercooler. It is controlled via a combination of boost pressure, tps (I think) and revs. You simply adjust the pressure/rev threshold and then the percentage of "injector pulse" into the airstream.
A pfc will do the trick but the aic would definitely atomize the fuel air better. Then it just sends more to the cylinders with naturally higher pressure (aka 5 & 6).
It is ideal for setups that require slightly more fuel then the injectors can handle. Such as 500hp with 444 injectors.......

[kelaog]

JD,

Most good ECU's will let you richen up one injector.. IE richen #6 3% and 5 by 1.5%

You might think I just hit my head...because this even sounds a little odd to me, now that I am actually typing it. There are quite a few custom setups that use supplimentary injection in similar ways.

Why couldn't one tune with a '7th' Injector firing at the inlet of the Plenum on an OEM "bung'd" Intake Manifold to help out (a bit) with the lean condition and 'stacked up air' that is experienced by Cylinder #6 in an RB26 using an OEM manifold ? (rather than just richening #6 only)....

Anyone with an aftermarket ECU that has a spare driver could accomplish this.....right ?

Additional Injector Driver capable ECU, plus, maybe something like a single 440cc OEM injector (since they are always readilly available) ?. Just something to help even things out a bit ?

I realize this is probably completely retarded sounding, as you might as well just tune #6 richer to compensate (as you will need to anyways).

BUT, could this have any positive affect on things ? at all ?

If budget doesn't allow you to run a proper Plenum, something like this could be better than nothing at all, no ?

[NismoS-tune]

The smartest solution is to use an intake plenum that has evenly balanced air flow to all throttle bodies, then you don't have to think about designing the wheel with a 7th injector?

As for correcting all the lean cylinders, that's what tuning your car does...