Injectors and mass air flow

[acroteau23]

i have a stock 2.3 and i was wondering if i change to bigger fuel injectors do i have the mass air flow sensor? how big can i go? where do i find them? the engine is apart so i thought this is the time to do it. thanks

 

[Rangersrule91]

I know you do have to go with a different maf if you do decide to go with bigger injectors, im pretty sure you can get them off any other bigger ranger or f150. Im not sure the full specs so somebody else should throw their 2 cents in too. You can get them at any local JY.

 

[acroteau23]

thanks. if anyone has anymore info please add

 

[acroteau23]

and where would i get the mass air flow sensor off of

 

[orangealpine]

My Duratec does not have a MAF. It uses a MAP, which would not have to be swapped out. Why do you want bigger injectors? The stock injectors are good for something like 175 hp.

Bill

 

[Hesstopher]

Anything over 175hp and you're talking about serious mods

I'm planning the following and don't think I'll hit 175

- cai
- headers (def exhaust, maybe intake)
- cat-back

A race buddy that's got way more exp in this than me said 170 is probably the high end of realistic gain, that's +25hp for $400-600 +labor (diy)

 

[BlackBII]

So you're putting in bigger inectors....

What have you done to get more Air in the motor? Forced induction? Increase Bore? Porting?

 

[Hesstopher]

Considering injectors are $300-400 and will do nothing without a heavy mod to the intake-stage (FI, more volume in cyliners, etc) you won't notice a difference.

I just asked my race buddy who has rebuilt his Nissan 350z engine on a few occasions, he ran stock injectors all the time and never had an issue (I know different vehicle). But really unless you're talking about a Focus PZEV Duratec it isn't worth it-- and even then it's a matter of an injector w/ slightly lower output because is has a finer spray to better atomize the fuel; so it becomes a trade off, more complete burn for less fuel or vice-versa.

I was encouraged to stay w/ stock injectors unless I'm boring or charging (turbo/super) the engine and it makes total sense to me. As orangealpine said (I'd like to see that in print just so I can better educate myself with this engine, btw) the stock injectors in the 2.3L D23 support up to 175hp, which is a serious gain over stock rating of 140/145 (forget which). That engine is now running at 120.6-125% horsepower of stock rating (140/145-170).

If you hit 175hp you have a 4000lbs truck w/175hp; or 22.8lbs/1hp which is decent for under a $1,000. Once you replace injectors you are automaticly in the couple thousdand dollar range for make it worth it. That is a big jump. Plus, this is just engine-- that much hp increase means stronger transmission (or strip/blow it), rear (see transmission), frame (to prevent torque warping). It all starts adding up and basically for the price of all of this you can just get a larger truck (for a modest weight increase) or get a older performance car. Just saw a 2001 Toyota MR2-S go for around $8,000 w/ 78,000 miles. The thing weighs about 2200lbs (curb) and has a 140hp 1.8L engine that trust me, rockets the thing. It's 15.7lbs/1hp ratio and 48/52 distribution-- for under $8,000 which is about the cost of purchase/install/tune turbo (if done cheap and not reliable); and this doesn't touch the trans/rear/frame aspect.

Believe me, I have researched the crap outta this. Unless you just HAVE to have the 4cyl beefed up, it ain't worth it. A Mustage 5.0L V8 swap will get you there much faster/cheaper/easier than doing a coup-de-ton on that 4-banger.