How do people feel about supplemental injectors?

[Riles]

Hey all. I was just wondering what everybody's opinion is on the idea of adding supplemental injectors to feed turbo or supercharged engines?

I saw this unit- the AIC-1. It can control 2 or 4 high or low impedance injectors with a programmable matrix (i think 128 points), which controls the fuel based on both rpm and boost level. I like how you can use your laptop to tune it.

It seems if you could just put in 4 injectors somewhere in the 30 lbs/hr range, you could support almost double the stock horsepower.

[MoreThanAV6]

As long as it always works and you can tune it right, it doesnt matter if fuel is added by a wet sponge.

[John_D.]

<blockquote>quote:</font><hr>Originally posted by Riles:
I was just wondering what everybody's opinion is on the idea of adding supplemental injectors to feed turbo or supercharged engines?

It seems if you could just put in 4 injectors somewhere in the 30 lbs/hr range, you could support almost double the stock horsepower.<hr></blockquote>

I like the concept a lot. Kind of like cold start injectors on some of the earlier fuel injected cars, only more...

On ours, with the "dry" intake design, placement of the injectors would be the key. To avoid running lean on some cylinders and rich on others. And to avoid puddling and backfires.

Might have to go with six rather than four, similar to a direct port setup, close to the heads.

[TurboProject]

where did you see this unit?

[strobhen]

Very common among Grand Nationals

Except they usually use just one more injector.

Remember though, our manifolds do not like having gas in them. I know a few people who have had rather nasty backfires running a wet nitrous kit.

[Riles]

Do you think it would work well if I just added 6 more injectors, each one being really close to its own cylinder?

Otherwise, where would be a good place for the injectors (far or close from cylinders), and how many do you think I should use?

Thanks!

P.S. Goto metacrawler.com and search for "additional injector controller". There are two units called AIC-something , but one isnt user programmable, and one is VERY user programmable [img]smile.gif[/img]

[Pike]

Fascinating... I wonder if this would actually work?!?!?

Supplemental Injector Controller

[Arctc Wolf]

well, the L67 heads have places for injectors in them, so why not use L67 heads with an L36 intake and that way u can have 2 injectors per cylinder?

[Pike]

So lets assume you could use the L67 head with dual injectors (do you have a website where one of these could be seen at? I tried gm parts direct but they didn't have it on their site) per cylinder. I'm thinking that you would already have to up your stock fuel pump to something with more output. You would also need some technical experience in fuel curves to get the programing right.

If the extra fuel was being put directly into the cylinders, hence bypassing our dry manifolds, this would be a great product for those running N2O or blowers. If you could get the programming right, this could solve that irritating problem of fuel supply thats been holding back the stock boost levels on our cars (of course, the L67 head is hardly stock...). [img]graemlins/burnout.gif[/img]

[Morgan]

Using 7th &/or 8th injectors installed in the turbo up pipe on GN/TRs is considered old school nowadays. The vote here is to use injectors of the right size, and tune for them. Case in point: I use a Walbro 340M in-tank pump in conjunction with a Bosch 286 in line to feed six 55#/hr injectors through the OEM fuel lines and an Accufab adjustable FPR. I recently pulled the 55's in favor of a set of 72#ers to complement a (much) larger turbo...which meant all my chips had to be reburned. Ah, the joys of owning a money pit!

Cheers,
Morgan

[strobhen]

Was posting at work, so had to be quick

But I would agree that the best solution is to use correctly sized & tuned injectors.

Much better option than slapping a bunch more in.

[Riles]

I just thought it might be easier to program the extra injectors with this system, because it is a cheap, highly tunable system that can be tuned with a laptop.

It seems that this system would be easier to tune for a simple person like me [img]graemlins/dunce.gif[/img]

[ December 11, 2002: Message edited by: Riles ]</p>

[John_D.]

<blockquote>quote:</font><hr>Originally posted by Riles:
I just thought it might be easier to program the extra injectors with this system, because it is a cheap, highly tunable system that can be tuned with a laptop.

It seems that this system would be easier to tune...<hr></blockquote>

I agree with the concept completely. Primarily because with some years (such as my '98), there is no real tuning available. Extra injectors, being a stand-alone system, could be tuned without affecting the stock pcm and injectors.

I went with bigger injectors already (24 lb). And you can use a maft to tweak the wot operation to adapt to bigger injectors. That is for wot only.

But the pcm is going to do it's own thing at part-throttle, and can only trim out fuel delivery up to a certain size injector. Replacing stock injectors beyond that size will create severe driveability problems. (fouled plugs, overheated cat, ses, unstable idle, etc.)

I might think about trying 28's, but I have doubts about being able to go that big and still have the pcm be able to manage them. I'm in 20% and up ltrims already, and seems like I heard 30% is all the pcm can go to.

Extra injectors are basically a more sophisticated version of the fuel nozzle in a wet nitrous kit... And have the added advantage that they could be utilized at part-throttle, not just wot.

[Formulao96]

I saw something really neat, and it is proven to work, and I plan on getting it within the next few months. Its water/methanol injection. It is a nozzle tha is added to the throttlebody, or further back in the intake piping. It uses a bottle to hold the methanol/water mixture, and it atomizes the mixtures in the air charge for drastically lower air temps. I plan on running this with my turbo. It showed a 50 horse gain on a supercharged Mustang, and that was at the wheels. It reduces detonation, and a single bottle can go for about 500 miles. And the cost to fill up the bottle is only a few dollars. This is worth looking into.

[MrCoffee]

<blockquote>quote:</font><hr> so why not use L67 heads with an L36 intake and that way u can have 2 injectors per cylinder? <hr></blockquote>

one for n2o [img]smile.gif[/img]