OK, recently got some bad gas from a local station. Especially sucks since the price of gas is so damn high. Anyways, got rid of the water and the truck is running much better. But I am still going to change out my plugs and get some new ones. The truck is still running kinda Ehhh.

I am trying to locate a new or used DBW Throttle body to clear up some other issues, especially after reading the thread that BigTex was having with his port DBW TB. I've got one too, and seem to be having the same issues. I need to check out my fuel pressure regulator and other fuel system issues related to the symptoms I'm having.

I have been thinking about installing a set of larger fuel injectors for a while now. And since the bad gas, thinking that a new set might be wise. My question is this though: Any real gain on a N/A motor by going with a larger set of injectors. Yes, I did a search, but didn't really see anything written in stone that someone says its a good mod. As of my last dyno, I was sitting at 321 hp to the wheels but that is probably higher now since I have a better tune and some other minor bolt-ons. I'm thinking in the range of 340 to the wheels. Is there a set of injectors that is a direct plug and play, I know tuning would be necessary, but is it worth it at all to do? If so, what size and where to get them?

 

you can but i dont think it is needed without a power adder.

 

I would think as long as your duty cycle isnt too long you dont need them. If you do decide you need them, let me know. I took my blower off and have parts laying around.

 

I think I've got what you need: Like new 42# truck injectors and a brand new DBW throttle body.

 

Well, I guess that was my main question. Is there really any need for it on an N/A motor? Obviously power adder is a whole other story. BigTex, let me know about that TB.

 

Does a N/A truck need larger injectors? Mine did, so I ran these 42# injectors for a little while N/A. Most SS trucks can get to the limit of the stock injector with bolt-ons. When I added a cam, I went well past the limit. Most experts say you need to stay under 80% duty cycle for an injector to be safe. Going to 100% duty cycle means the injector is open constantly, which can cause it to fail. Not to mention the fact that if it can't flow any more fuel, you are likely going lean on the top end. I would routinely see 115% duty cycle on the stock injectors above 6200 rpms.

With your power numbers, I bet you've maxxed out the stock injectors. When you add a cam, besides making a nice power jump, you've also increased the rpms your truck can turn to make power. Both of those facts go against the fuel injector - you need more fuel to feed the new power and with higher rpms, you have less time per revolution to add the fuel.

 

Im Glad You Asked This Question I Was Wondering The Same Thing. So What Is A Good Size To Get For The 5.3 And Full Bolt Ons And A Descent Size Cam Like Mine? And I Dont Mean To Hi Jack Your Thread Curtis.