3.5L fuel injector size

I've been looking everywhere for the volume of the stock injectors on the 3.5L. I'm wanting something a little larger but it's hard to do when nowhere lists what we have. Who can help me out?

 

Can I ask why you want larger injectors?

 

With new inner fenders came new filter and housing. The UMP filter housing I'm using is getting the engine too much air and the stock injectors can't keep up and constantly throws lean codes.

 

Something else is up. An intake shouldn't throw a lean code and bigger injectors won't fix the problem.

 

it sounds like you may have other issues, I doubt a filter assembly is leaning out your A/F mix.

 

Care to elaborate please?
The stock box and filter are very restrictive. I'm curious to learn anything anyone can teach me

 

Just google it. too much to explain. People run aftermarket intakes all the time(they don't really do much but make noise) with no issues. Something is up with the truck or something was installed wrong.

What code are you getting?

 

The intake you're using has a different internal diameter (ID) than the OE Airbox. The ECU has a calibration table(s) for the MAF, and it's calibrated for a specific ID and placement. Changing the ID of the MAF housing will cause the MAF to read differently, which in turn has the ECU referencing incorrect airflow data based on the calibration table(s). This creates a bad airflow model and the ECU is attempting to fuel the motor for the airflow it's expecting given the MAF reading. With the ECU attempting to fuel the motor for an erroneously calculated amount of airflow, the fueling will be off (naturally) and your fuel trims will attempt to correct for this error. If the MAF housing diameter difference is large enough, it can push fuel trims to exceed their thresholds and trigger your MAF code.

You don't need larger injectors thankfully Your port injectors are ~288 cc/min @ 43.5psi

You need to have your ECU properly calibrated for your new intake or put the MAF back into a housing of OE internal diameter.

 

Exactly! Good way to explain it.

I would get rid of that intake and go with something made directly for the 3rd gen tacoma(Same ID as the stock intake).

 

You can only suck in as much as as your throttle body allows. Unless it's forced in via forced induction. People with the Magnuson super charger are running stock injectors so I highly doubt you air box/filter setup is pushing in more air than that does

 

Yes i agree. The CAI sold are junk and do very little. Everything I've said here is just regurgitated info from my tuner who watched live data to see it lean out.
What is the point of wasting your time to tell someone to "Google it"? I have Google'd everything i could to find a problem. Talked to numerous experts. And I'm here looking for a simple answer on injector size.

 

You need a new tuner by the sounds of it

 

Now that's constructive. I didn't realize they were still stock injectors on the s/c. Thank you

 

some time back there was a turbo project here and some were using the injectors found in the Lexus TT version of this motor. and the problem they came across as i remember was that the injectors weren't the issue, but the fueling was. upgrading the pump and controller from the tank became a huge headache iirc. some turbo guys may chime in... @JamesT @mZiggy

 

You need to curve the MAF for the housing size it is in. Not a difficult process. If you have tuning software you need to datalog the fuel trims and start adjusting the MAF accordingly. This is something tuners do all the time.

 

Stock air box is from a 5.7L tundra engine.

 

Thank you. The housing is the same size actually. It was larger but i machined an aluminum sleeve to keep it the exact same size and placement

 

Yea but we are telling you, bigger injectors wont fix your issue.

Also you need a different tuner. He should be answering all these questions as its basics 101 when it comes to ECU tuning. If the truck is leaning out then it should be a VERY easy fix from a competent tuner. Especially since the stock injectors are no where near there full duty cycle.

 

I'm hearing you. I'm planning to test out a few things independently today to try to narrow down what the actual issue is. Thanks guys

 

What are you going to test?