All mods are in my sig; the latest is the addition of the A3K. Prior to this install, the J/A and injectors would peg boost at 39 psi regularly and quickly if I rolled on about 3/4 throttle and higher. The A3K spools well for me, and will boost to 45 psi at the same throttle (set the Attitude to defuel and alert at 45).
Truck runs fine, a little clatter under light throttle, no smoke at idle, starts, idles, and runs out under throttle like silk. Mileage is consistently around 19 mpg mixed highway and city. EGTs will hit my 1350 limit under heavy throttle now, never saw that before the turbo upgrade.
So what is my complaint? I am in the minority here that does not want smoke - unless I jam my foot on throttle. And what I have now is fuel smoke ranging from black (steady stream, but not a huge plume) under no boost to about 10 psi to a light haze under boost. This is even on Level 1, and gets worse on higher Edge levels, even with low boost fueling turned all the way down.
The "F2"s I have were told to me to be the same as the EDM versions, only EH'ed versions in the milder steel (got caught in a bad run period for F2s, thought the compromise would be OK, and the price was very right). Only about 5k miles since the install.
I have pulled and checked the injectors, minimal carbon, and triple checked torque sequence and values on the re-install, with two sets of eyes. Used new copper seals, and no oil in fuel that I can detect after a recent 1k mile run.
So - after doing some research here, I think 100 hp sticks may be too much. Does it sound like a step down to 50hp will help? I don't want a strip rig, just enough power to play a bit and get a good kick on heavy throttle. If I need to step down a peg, any advice on DDP or II injectors vice F1s?
Or am I way off base, and need to check for another problem?
Have been told a step up to a modded CP3 might help, but I not interested in that route. Appreciate any advice - TIA...

 

Again - with feeling......

 

Don't know what to say other than go back to the stock injectors and a mild performance box, like the Edge EZ or a VA C3.1. Anytime more fuel is added under low boost conditions it will smoke, nature of the beast.
I can smoke like crazy with the SMARTY under those conditions, so I learned to control it with my right foot.

MikeyB

 

I agree. Stock injectors may be the answer. I don't like smoke either... at all. But it's the nature of the beast. Try different settings on your Juice. Maybe try a programmer like Diablo. Stack it with juice, both on low settings. You may be surprised.

 

As you can see by my list of mods, I feel your pain. Before I did injectors the smoke was controlable. Now it is not. It's heavy and black if the Juice is on at all. A modded cp3 won't help. More pressure won't help. I am going to rough it out until I can afford to put compound turbos on it. I need more air anyway at this point. With no Diablo loaded, Juice on Hot, mp8 on or off (doesn't matter), I can hit 1600deg on egts by the time I hit 90-100mph. The problem is indeed your injectors being to large for the set up. In actuality, FLux 2s have been shown to put down more like 150hp. I got the 1.8s to try to be right at the 100hp mark. I was told that dyno runs have proven Flux 1s to add around 60-70hp. That's what I should have went with - and you too , but hind sight is always 20/20.

Live and learn.

 

Don't you think the F1's will still cause smoke?

 

I'm at a loss to figure what injectors you have....I think you think you have extrude honed flux 2's made of mild steel...All Flux nozzles are EDM'd as far as I know and the nozzles are all alloy steel as far as I know. I have Flux 1.5's which with stock fueling should be around 75hp. I am running Smarty Beta 4.4 with the stock turbo, modded air box, and a 5" exhaust after the stock downpipe. I've never drained the rail even on SW9 which is a little more aggressive downlow than the sw3 I tow and daily drive with. I can see 40psi (the wastegate is disabled) I get a puff of smoke on a hard pedal start and other than that there is no smoke unless I lag it then tromp on it.

I'd go back to the equivalent of a Flux 1.#. Anything above this and your downloader or box will be supplying more fuel than you are getting the corresponding timing for unless you have an oversize turbo such as a 66 or A5K which will result in Smoke. The smaller injectors will give you all the benefits and more useable adjustability with your J/A. ks

 

Very good points omaharam. And I agree I laugh when people talk about daily drivers and big injectors. I dont care what you are running it changes things drastically. I have 3.5s and yes I drive my truck daily, but I really drive around the truck and the mods. Their are many times trucks want to play and I simply cant due to all the traffic and the fear of the state boys. I just ordered much larger twins, but I still realize I am going to smoke and its part of the game. I really only go fast when im alone early morning or late night no traffic, cause a bombed truck is gonna roal some coal.
Well I guess I could try nitrous but Im not a big drug fan. I would say Flux 1s, you will idle smooth, get increased power, and may even increase MPG, win win.

 

Whose twins? inquiring minds need to know....

Do you feel that compound turbos help that much with smoke?

 

My new ones are from Maxamized Performance Inc/ also known as Nathans twins. I think to a point twins help, but I also believe when you start bombing you are always gonna sacrafice a bit of daily driving. I really dont know how much twins help, I twinned my truck before injectors and alot of other bombs. I think smoke is always going to be part of a moddified truck on the street, unless you stage and do boosted launches from stop light to stop light . Maybe thats what I should try.

 

I'm no fan of excessive smoke either. I currently have the stock turbo and injectors, and Non-Beta Smarty stacked with the Quad Race. So far it's working great with good power, and adjustabilty on-the-fly with the Quad. No smoke with this unless I try.

I think I have increased mileage too, but I'm still testing.

 

Twins should help. My theory on that is that right now the smoke will clear up a little above 10-12psi with light throttle - we're talking the A3k turbo here. Of course if you lay into it it stays smokey, but we're talking about just normal driving leaving a stop light. The compound turbos should start to move air sooner and that should clear up SOME of the smoke.

 

I make more smoke now with the twins than I did with the stocker... but only with heavy throttle off the line. It's just that the top turbo doesn't spool quite as fast as the stocker, but once it does start, the smoke clears right up. The twins provide a greater volume of air at the same boost and cooler air too. It won't smoke as long as I use smooth lighter throttle from a stop.

 

Your last statement is exactly what some of us are looking for. Besides, I plan to use a stock turbo in my set up if I can - should help spooling - , but I haven't called and talked to Nathan yet since I'm probably 6 months away from doing anything.

 

Oh sure, I understand. Turbos alone are a complicated subject much less than talking about twins... complicated times more than 2 I'll tell you. But I have been getting my undergraduate degree in twins education since I installed mine.

Like RyeThomas, he's selling his BD twins for larger twins from Nathan so he can presumably have more top end. You are looking at the other direction... I am somewhere in the middle. When incorporating your stocker, that will limit you to a degree because it is designed as a single and to operate that way. But still obviously doable. You may get that spooling, but you will limit what the bottom turbo can do because of drive pressure and the risk of overspooling the top. That last statement is way oversimplified so don't take it as an absolute. Just remember they have to work together. You can have it modified too and that will help. Twins are an entirely different world-- that is for sure.