i was just wondering what do you get out of buying a higher cc fuel injector? like by upgrading to a 880cc fuel injectors. will i get anymore power from them? or is just a more stable path for fuel to allow more in.

thanks for the help

 

It allows for the increased amount of fuel in the increased air/fuel mixture, for the increased power!

Yes, it allows for more flow of fuel at a lower injector duty cycle, if I am not mistaken.

 

thanks for the quick help

 

more power means more fuel, so that why they need them larger. the more mods the more the stock is going to have a problem keeping up. Getting the larger ones gives you room to add more to the car, This of course requires tunning

 

higher cc allows you to run more fuel, more fuel means more power with the equal amount of air.

read my tuning thread, i just had this porblem, i ran out of fuel with my injectors because i did a ported exhaust manifold. So it will allow you to add on as many bolt ons you want and still be able to make power....get like the 850cc or 880cc like im doing

 

More fuel doesnt equal more power unless you also increase airflow. In fact just making the engine run richer will make less power.

Injectors are a supporting mod, not a power mod. If your on the stock turbo with the stock injectors you will not make more power just by changing your injectors. However, lets say you install a larger turbo then you'll need to upgrade your injectors to supply enough fuel for the additional air supplied by the turbo.

Exception, if you want to run e85 which is higher octane but uses more fuel you will need to upgrade your injectors. In this case injectors might be the only mod you need to be able to run increased boost and make more power.

Injectors should be sized correctly for the application as you don't want to run huge injectors on a car that doesnt need them. Genearally speaking smaller injectors atomize fuel better than larger injectors and will have better idle quality / fuel consumption. In other words dont try to fill your glass with the fire hydrant, use the sink.

 

Mental movie!

Josh

 

Well put Mr. Evo IX! Most injector companies recommend running no more than 85% duty cycle although you can get away with a bit more at times. Duty cycle is usually a term that it misinterpreted, as most people tend to think 100% DC means the injector is on 100% of the time. This is not the case, it means it's fully on for the "cycle" of time that the injector has to spray during the intake duration. As the rpm increases, the physical duration time drops, and as the time drops so does the amount of fuel a smaller injector can inject during that limited amount of time. Therefore, if you have plenty of fuel during low rpm/full throttle, but are running into high duty duty cycle times at higher rpm, you need to increase the physical size of the injector to allow more fuel to be sprayed during the shorter time window.
So, if I confused any of you, here is a hypothetical situation. These are just numbers I picked off the top of my head and in no way representative of real life, only the theory is meant to be applied.

Say an injector can flow 500cc's of fuel for it's given injection time window of 30milliseconds at 3,000rpm at 100% injector duty cycle. At 6,000rpm the cycle time is divided in half now to 15milliseconds, therefore only allowing the injector a max flow of 250cc's of fuel, but with the same 100% injector duty cycle. If you're fueling requirements specified at least 300cc's of fuel (hypothetically depending on air fuel ratio of course ) at that 6000rpm, then an injector upgrade would be necessary. Sorry if I confused anyone, it's kind of hard for me to break it down into layman's terms. And feel free to correct any of the info that I may have screwed up in my hacked translation.