My question is can I just drop in the Power Enterprise 380cc injectors that I have without scalling, my thought process here was a larger injector would run less duty cycle on factory tune, thus longer injector life, I think I am running my stock injectors at peak duty cucle due to my mods and reflash.
Your thoughts?

I am hoping to here from Julian, Sharif and Jeremy on this or Sam or Dave or Adam!

 

subscribed and awaiting answers as well!

 

I dont THINK so. The stock ecu will not like the bigger injector without some sort of retune/reflash or piggyback unit.

 

SERIOUSLY doubt you're maxing out your OEM injectors w/o FI or some major high-revving mods? What are your mods?

 

I know it can be done but your idle might suffer from it.

 

The ECU is programmed with certain injector flow value and it calculates AFR based on that value and injector latency. If you change the injector size, that calibration is out the window. First thing that will happen when you turn thecar on is a rich condition. Shortly after that, the ECU will try to correct based on O2 sensor feedback and your long term fuel trims will start drifting towards negative values. The ECU may find a way to work with the larger injectors in closed loop. I say may because it can only correct up to certain amount. After that, you're out of luck. In open loop, you'll just run overly rich, period. There's no O2 feedback in open loop so you'll be dumping extra fuel for no good reason...costing you power and money for extra gas. If you go big enough and dump enough fuel in, you may experience cylinder wash effect. Very bad for the engine.

There's really no good reason to upgrade the injectors unless you're maxing them out. You should always run with injectors that are correctly matched to your application. Upgrading OEMs without major breathing mods and a retune makes no sense. What are your IDCs?

 

Thanks guys, I figured they are not too far of from stock size and the ECU would be able to compensate, I guess not. Stock is 270cc I believe.
I do have an AAM reflash along with all the bolt on stuff: APS tall boy plenum, Headers, high flow cats,
Injen MR CAI, Injen track exhaust, HKS DLI II, non of the other mods should matter (pulley, grounding kit, plugs, etc....)

Jerry

 

Actually, they are too far from stock. They're 40% larger!!! I guess if you were pulling 40% above stock HP, like 400-420, then this would be a very practical mod.

 

well if you're going to reflash anyway, you can scale the injectors that way so they'll work for you.

 

Already had the reflash.

 

how on earth could you be maxxing out your stock injectors if I'm not even close to....I haven't even needed a new fuel pump yet

don't look for things to do just for the sake of doing them

 

335cc @ 3.5 BAR. you will run richer, but if you have the ability to take fuel out with a controller via MAF conditioning and tuning you will get more timing advance. 380 is pretty high though, id say overkill even for MAF conditioning

 

I think the question that has not been answered is why the OP thinks he needs larger injectors. To the OP, what are your IDC at high RPMs, WOT? If you're in high 80s or even low 90s, you're still OK and do not need bigger injectors.

Going larger will not add power to your car. Injectors deliver fuel. That's it. How much fuel they dump is based on your air ingestion. It's really that simple. Having more room up top does not help you and going too big can actually hurt. large injectors tend to have bigger latencies. Manufacturers claim they can double the flow and still have the same latency as stock but from experience, that's a lie. Larger will almost always be slower and will be harder to tune, especially idle.

 

yes you can use them with the stock ecu since they are included with the power enterprise kit, which comes with no engine management, anything larger however require some sort of piggyback, reflash, standalone