Just wondering how good our injectors are.... Could running a dry shot put extra strain on them once the computer compensates and adds more fuel for the nitrous. Working my injectors overtime lengthens the pulse width which increases the duty cycle of the injectors...am i running a risk of my injectors failing? Or maybe this never happens. If this is true...wouldn't the same be true with a wet kit....don't you always run the risk of the injectors failing?.....need some help on this topic

 

Someone's gotta know somethin bout this!!

 

Not sure about the trucks but my friend had a dry kit on his ls1 and he had his injecters redone twice because of it. And we had a 100 shot in it and my 150 wet kit felt way more power full. Like the 100 shot dry kit just felt like a 4 barrel opening is all nothing special. Does this help?

 

In my experience running dry shot causes a delay for the computer to compensate for the fuel. It will read on your O2 sensors, and through the EGR sensor, if these trucks have that like my mustang did. Then after the motor has already run through the nitrous, it compensates after the fact. It is about a one second delay for the computer to sense it, and maybe faster on the OBD2 systems. OBD1 on Fords take measurements about 6 times a minute. Now I don't know OBD2, did not continue being a mechanic any longer, so I got no training on it. But I heard that it takes 16 measurements a second, and I would guess would be almost 3 times faster than the old system. Dry shot still may cause damage and hurt the motor for an extremely lean burn. It used to be the only choice for nitrous though, but with todays wet shot systems, it is almost completely unneccessary to run it, and the gain is very little on fuel injected motors. In carberatued motors, the motor is ten times more likely to run in a rich condition all the time, and with double pumpers that squirt so much fuel into those motors, dry sytems work great, but still require a lot of tunning.

I am not capping on your system, but it has always been recommended to never run dry shot on fuel injected motors. I had been taught that about 11 years ago by most of the racers that I knew.

So what it comes down to, is that it will tell the injectors to run at their highest level, and in a stock application, that will go through the injectors pretty fast in my experience. According to the books, running wide open on the injectors will not take life away from the expected amount, since it is just a selinoid that opens and closes, but alot of people don't relize that it is a variable selinoid, and any mechanical item that works at its max level will wear it out faster. BUT that is just my 2 cents on it.

Running a higher flow injector will help you out and give more power, and will cause no adverse effects. The stock fuel rails on these motors should be able to handle about 350 to 400 horsepower applications, in its stock form, but I don't know what you are running. So anything above 350 hp or more, you should upgrade your injectors and fuel pump. I don't recommend in line fuel pump helpers, or electric devices that speed up the stock pump, both, wear out the pump real fast and can cause problems. Just don't go too big on your injector choice, or you may have trouble idling proper without a retune of the motor, and cause you to run a pretty rich, and foul your plugs. The computer compensates for everything, but it still is limited to its level of programming, and the level of the aftermarket parts that you run. Just adding 100 or 150 hp to a stock motor without major upgrades and a computer retune goes way beyond the most extreme levels of what these motors were tuned to do!

I hope I didn't blabber on, just trying to fully explain, and I hope this helps.

 

That helps alot, thanks!

 

OK, did a little research. We have 24lb injectors on 99 5.3 motors, could not find out if they went to 27lb injectors on later, but found a couple of posts were someone with a 2001 said that the stock was 27lbs. I also found that the fuel pump is a 165lph pump. This pump should be good for about close to 400hp at the crank, maybe. I used a 195lph pump on my 450hp mustang. So with your 100 shot, I would still look at upgrading your pump to a 195 to 205lph pump, if they make these for our trucks. Fords suck, but man they have every aftermarket part you can imagine. You are probably going to be running more mods anyway. The Radix magnacharger comes with a new fuel pump according to Lingenfilter, so I know that they should have upgradable pumps. 21lb injectors are good for right about 298hp or below, 24lb injectors are good for about 350hp, and 27lb injectors are good for about 420 or so. 31lb injectors are good for about 500+hp. These are at the crank numbers. All these have been seen to run higher horsepower applications, but, then you are running them wide out all the time. You need to upgrade your fuel volume with higher flow pump, for any real benifit of these higher flow injectors to take effect. I know on Mustangs that the 31lb injectors starting causing running problems on there cars, needing custom tunning. Could not find out if anyone knew if these computers could compensate for that high of flowing fuel systems. Asked my friend Myers, he is a master tech for Chevrolet, and gave me most of the info, but he has not seen people do wild modifications to this vehicle like we all intend.

If you want to go cheaper, just run a wet system, since this will apply the fuel and nitrous together, it is instantanious power, doesn't require custom tunning, or upgrading of all the parts. You should be able to run about 400 hp at the crank all day without coming to the limits of the stock fuel systems, since their systems are all ready tuned. I have read a lot of reviews on nitrous, and have heard that the best most complete systems to run, that just work damn great are the ones by Nitrous Express. I was considering this for my truck in the future!

Good luck!