injector size and brand for S/C'd nitrous ranger

[lifted4.0]

yaa, 4.0 SOHC
JBA headers
custom 3 inch intake KN filter
straight pipe after cat
port/polish heads
W/M
the eaton m90 at about 8lbs..9lbs?
possibly nitrous (dry kit) to make up for the last HP i need to get to my goal



went to the dyno!!! DISAAPOINTINGLY, the truck right now with just headers, charger at 6lbs, 2.5 inch scilicone intake

made 200whp and 248wtq

 

[Wicked_Sludge]

wow...that is amazingly low for that engine with that boost.

how were your a/f ratios?

 

[lifted4.0]

rich (12.3ish average) throughout untill about 5,700 rpm it hits the line of 14.7 and the chart stops right there...

 

[turbo cat]

mostly because your only running 6lbs of boost with a eaton blower. blowers also rob crank power to spin the blower. The rwhp sounds about right as the drivetrain is robbing some of the power. What kind of dyno was this. transmission?

Just my 02 your not going to make 400hp reliable with nitrous. if it were me i would ditch the blower sell it for what you can get. Then ditch the nitrous and go wit ha turbocharged setup. The m90 is already probally maxing out and you can go any further without overspinning the blower. If you went with a turbocharger you could see possibly 250-400hp with amazing torque. Thats up to you and Id leave it at that but I already saw this coming. fully stock 4.0 ohvs with 15psi can make 300+hp and nearly 350ft lbs thru an auto at the wheelswith a turbo. Good luck getting to your goal either way don't give up either!

 

[lifted4.0]

i weighed that option a few times, and i determined that it was to custom for me to do that project of a turbo...

 

[Wicked_Sludge]

drivetrane losses on rangers is in about the 15-17% range. that puts you at about 240 crank horsepower. you were running in a 1:1 gear with the torque converter locked (if its an auto), right?

33HP from 6 PSI is LOOOOW. id expect to see closer to 60-70 at the very least. who did your tune?

 

[turbo cat]

6 psi is a very low amount of boost. other factors like how much hthe blower robs and how much the drivetrain is robbing, tune....How does the truck feel out on the street? If a turbo is out of the picture why not a centrifugal blower. A centrifugal will give you high rpm performance vs low end performance of a eaton. Also what size of tires are you running?

basa820 over at RPS has an 04 4.0 with ported heads, 9.1 forged bottom end and 6lbs of boost. His power was 233/288. it also depends on what kind of dyno your truck was on?

 

[lifted4.0]

noo its a 5 speed, sludge

local performance shop "quintin brothers"

it feels like the truck can get going on the streets..for a truck atleast

i didnt know what was wrong wtih a centrifugal blower...iu dont think many people have done it on a 4.0?? yes? no? and at the beginning of this quest i was going for more low end power to tow, and now im kind of trying to mix the two..

 

[turbo cat]

how about bolting on a centrifugal and feeding that into the M90. Now that would give you some good boost. You would have to keep the 6 psi pulley on the m90 and underspin the centri to keep the boost down. Bolt on a meth kit and it would be a blast.

 

['93BajaSport]

I think the biggest problem is in the tune. The AFR pegging lean on the upper end was hurting power a lot and the 12.3 under boost was a little lean, but not too bad if there is no pinging.

On a (late) side note, I crunched the numbers and came up with 42lb injectors supporting 310bhp using an 80% DC and 0.65 BSFC. It would take something in the 60lb range to support 450bhp(400bhp + 50hp dry shot).

 

[lifted4.0]

yaa i dont know if the tune was the best...but i had heard that it was better to have it on a dyno rather than duog from bama chips sending me a tune...

right now, im waiting for the custom pistons to come in soo i can start building my other engine...im still contemplating running nitrous or not...i dont know how often i would use it...and although i would like the fun/thrill of it...possibly expensive..? and i cant really use it for the towing power efficently..

anyone have any GOOD power adders that i could add...instead of nitrous..soo that i would have power without having to burn the nitrous

 

[rurouni20xx]

wait a min i did the math for my 3.0 and at 15psi boost for 300 hp on 6 cylinders at 80% duty cycle (fords safety margin is 85%) i need 42# injectors per the formula on rogueperformance.com. did i do my math wrong or am i missing something? im using accel 44# injectors that way my safety margin is a lil more and i can get the injectors in 40 or 44, bigger/richer is always better than smaller/leaner in my opinion. im also going to use a walbro 155lph fuel pump.

 

[AKBroncoII]

What forged pistons did you end up ordering? I would like to do a turbo setup also but it is too much work for me.

 

[RacinNdrummin]

Cmon you guys, turbo setups arent that much work, Just look what Turbo Cat has done with his setup, just a bit of exhaust tubing and some fittings from the hardware store.

 

[AKBroncoII]

Too much work for me as I have to swap back to stock every two years to pass inspection.