Where is the best place to buy these?
Anyone have a set?
For 1998 f150 4.6 which is getting supercharged.
Thanks.

 

A reliable set, not sure. Ebay maybe. (?) Why not 36's ? - Unless your build is going to be 580+.

 

I am going to use a lightning 90mm MAF and that is set for 42's.

I figure 42lb x 8 = 336, / .65(BSFC) = 517HP x 80%duty cycle = 413HP supported.
5.4l = 260 hp x 9 boost/17 = 397HP. So I think that the 42's are fine up to 9-10 boost.

36lb x 8 = 288 / .65 = 443HP x 80% = 354HP supported
5.4l = 260 hp x 6 boost/17 = 351HP.
So the 36's are barely adequate at 6 lbs boost and will not support any higher boost.

 

Good Job.



If you don't find an answer, -call Ford Racing or Troyer for direction.

 

Just get 'em used (forum classifieds)...



The truck will need a tune no matter what MAF or injectors you run.



What fuel pump is going to be used?

 

Well, if your not that picky (I would be) and decide that anyone's 42's will work, - here's a few options. You can have them sonic cleaned. Purchase an injector rebuild kit (new screens), do it yourself. You can also flow test and run solution thru (bench clean yourself) w/12v vRef/supply. This will test positive closer as well (leak test).

Good Luck

 

I think that you are right about being picky. How much would I really save on a used set and then if I add in the cleaning/reburb I am near the price of new. These are too vital to safe engine/boost/longevity for the sake of saving a few bucks. I think I might get these:
http://www.blueovalindustries.com/en...el/en4540.html

The plan is ONELOWF's powerdyne S/C with 90mm MAF, 42lb injectors, 255 intank pump, custom tune on dyno with HP Tuners software hopefully.

 

My bad, I did the above calculations for a 5.4L with the higher HP. I made the changes to the above post.

4.6l = 220 hp x 6 boost/17 = 300HP.
4.6l = 220 hp x 9 boost/17 = 336HP.

36lb x 8 = 288 / .65 = 443HP x 80% = 354HP supported So good for up to 10-11 boost.
30lb x 8 = 240 / .65 = 369HP x 80% = 295HP - Not enough for 6 boost - TOO SMALL!

So it figures out that for a 4.6L 36lb injectors are enough, and for the 5.4L 42lb injectors are enough.
Sorry about the error.

Now my question is-
Can I still use the Lightning 90mm MAF (which is calibrated for 42lb injectors), Can I use it with 36 lb injectors on my 4.6L?

 

According to your calculations, I guess I need to stop providing enough fuel via a set of 42#ers on a 5.4 equipped truck seeing 15# of boost

 

Wow, your 5.4L should be making 260HP x 1+15/17 = 489HP! Any dyno sheets?
Do your 42#ers provide enough fuel?

50lb x 8 = 400 /.65 = 615HP x 80% = 492HP So at your HP level you would be maxed out with 50lb injectors but this is making it very safe assumptions of .65 BSFC and max 80% duty cycle.
If you tune to .60BSFC and 85-90% duty cycle or use a FMU or turn up the FP you could do it with smaller injectors but it would be at risk.

For you I would use 50lb injectors if you are happy and plan to stay where you are. But if you plan to make more HP, I might select 60 lb injectors.

Your thoughts/experience?

 

Stock for that motor is 340hp I guess you forgot some F-150's are factory supercharged...


There are plenty of people are running same amount of boost on Lightnings and Harley trucks with stock injectors a good MAF or MAFia on the stock 90mm with no issues feeding the motors.






Where do you get the 90mm MAF is "calibrated" for 42# injectors? Your ECM needs a tune which is the calibration

 

Injectors can be made to flow for more than what they are rated for or less. Procharger uses (I forget the name) that builds the pressure in the rails to get the stock 19#s to flow enough to handle the boost. Its not very efficient and far inferior to custom tuning, but it works well enough.

IIRC, ford racing had them going for $249 for the set and the EV1 to EV6 adapters included. That is what I bought. I have a 98 4.6 also, running 10lbs with 42# injectors. They could flow for much more than what they already are also.

Oh and btw, you will need a lightning 90mm or larger MAF when using 42lb injectors. If not, you will start pegging it in the higher rpms and good luck tuning a pegged MAF sensor.

 

I bought a set of new 36lbs EV1 for $240.
I have the 255 pump and a shop quoted $180-200 to install. I don't want to crawl under there with the dirt and rusty bolts to drop the tank and change the pump.
Just waiting for the rest of the parts.

 

it takes 15 minutes to drop the tank and swap fuel pumps

 

Took me about 4 hours, but I'm old and slow.