I would like to put a 90MM mass air meter and 42lb injectors
in my 2001 f150 5.4L. I have headers, catback exhuast,75mm
throtle-body and dual tip plugs installed.

Will this setup run on 87 octane?

Any other ideas ?

 

It would be a waste of $$$$. Your stock 19# injectors will support at least 300 hp and I doubt that you are at that level with the mods you presently have. The 90mm MAF will need a tune to run properly so you are looking at a chip or a tuner to set it right. I would check with Troyer Performance. Call Mike Troyer. He goes by the screen name of Superchips Distrubitor in the Computers forum. And yes, your truck
would run on 87.

Regards

Jean Marc Chartier

 

dual tip plugs... that better not mean bosch!!!

 

Yes , they are bosch plugs!!
What's wrong with them?



So if I use a tuner , like Superchips right off the shelf it will
setup the 90mm MAF and the injectors?


THX for the replies!!!!!!!!!!!!!

 

Hi.

1. Bosch plugs have been known to have issues with these engines. Better to use Motorcraft or Denso. Do a Search to learn more about this.

2. No. Not an 'off-the-shelf' tuner. It knows nothing of your mods. You need to apply *custom tuning* via an SCT device, with the custom code supplied by an experienced, reputable tuning person. Most folks here Highly recommend Mike Troyer over at Troyer Performance ( boy is that an understatement ;-)).

The tuning is accomplished with consideration given to your proposed mods, and other factors, if you still insist on installing them.

Hope this helps.

Cheers

 

42lb inj are way overkill and i dont think any tuner will tune those in for you get 24lb if you insist on changing out your injectors and yes you need custom tuning to run the maf and inj. go with mike troyer he did my tuning

 

So if I go with the 24lb injectors, can I still use the
90MM MAF ?

 

Yup. Check Bigtruck311's sig.

Remember: With a *custom* tune.

cheers

 

I'm not trying to start a hot debate here but what advantage do you think you will get from going so large with either or both these changes, on a near stock engine?
Yes a tune will make them work, but why do it?
As stated, the stock injectors and MA are good for nearly 300 hp.
Realisticly, the engine can't make worthwhile use of them and you may be asking for problems.
To back this up, try to understand that injectors operate on a pulsewidth basis as the way they control fuel amount.
The normal system design ( for pulsewidth) is to operate them from about 10% at idle to about 90% pulsewidth at wide open throttle.
Going too large on injectors usually makes them operate below the 10% area. Below about 10%, injectors don't meter fuel in a very linear fashion. Even with a tune this can cause idle and mid range problems.
The only other way is to reduce fuel pressure to allow them to be operated above the min. of 10% ( by tuning), to make up for too large an injector.
I would rethink this unless you are going to a blower application.
Remember that the 4.6L engine is only 281 cu/in. The 5L engine is 302 cu/in and runs the same size injectors and most likley near the same size air meter.
The Mustang people make the same mistakes.
It makes no difference what engine it is, the same principles apply.
Use injectors and meter that fits the engine power range.
Example: I know personally of a 5L stroker to 331 cu/in that runs a Kenne Bell blower at 14 psi boost. He runs a 90 mm air meter, big injectors and a custom tune. The rig weighs in at 3750 and runs low 11s times at 120 mph.
With all that, you can see, you can't use that much fuel/air capacity.
I run a 5L Kenne Bell blown at 7 psi on stock 19 injectors and speed desnity/ no tune, yet.
The only engine that benifits from increased fuel, and makes more power from it without any other mods, is the diesel engine. That's why tuning a diesel gets way more power than a gas engine gets from tuning with a chip or program controller.
I've given a lot of tech and example about all this so you have enough to think about.
Good luck.

 

I agree with everyone else...I would not spend any money on the MAF or injectors. Spend it elsewhere, you will see more performance out of underdrive pullies or something like that.

Upgrading fuel injectors by themselves is rather pointless, they should only be upgraded to support OTHER mods.

 

I forgot to mention that I also have a cold air box which is
forced by ram air setup.

I gust thought by upgrading the injectors and the MAF
that the engine would benifit from this.

 

FISHTAIL,

I basically have the same mods that you have, with the exception of the headers. I talked to Mike Troyer over at Troyer Performance about getting the Excalibrator tuner. I wanted to go with the 90MM MAF as well, but after talking with Mike he stated that the fuel system that comes with the truck from the factory only supports 300 horsepower. After your tune you'll be over that 300 hp mark. He suggested that I get a 190 lph fuel pump and 24 lb. injectors. This setup will support 400+ horsepower. I haven't installed them yet due to the weather up here in Michigan and lack of time . You might want to call Mike himself and see what he recommends since he IS the MAN. Hope this helps.

 

OK, I'm going to go with Troyer Performance.
I will update with results after the install!!!

(In the mean time I need to ask some questions
on a body lift. So I will do this in the correct forum.)

THX to everyones replies. FISHTAIL