coas

Use the 0280155710 or 0280155700 or 0280155746 WITH the high pressure regulator. With this setup the injectors output will be 220cc/min which is just what needed.

More over, the effect of the high pressure regulator is noticeable, the better atomization effect performance and mileage. These and emission are the reasons OBDII Jeeps are working on 49PSI.

Or use the Neon injectors with no pressure change.

Pinging happens when the lean condition is radical, the engine can run lean with no pinging but the long term damage will accumulate.

BeepBeepImaJeep

ah ok so is there a small list to where i could pull the injectors and regulator from at the JY? there yellow stick style and come in some 4.6s and 5.0 mountaneer,explorers,f-series maybe? correct and the regulator that i need should i pull that outta something at the JY or is there one i should just order online somewhere, thanks

coas

Look back in this thread, there are lists of cars that use these injectors and regulator.

If you switch regulators then here is the right way to do it.

Verify no pressure in the rail, use the shredder valve.
-Take the old one out, make sure both O-ring are out.
(-It's a good opportunity to clean the fuel rail....)
-use some radiator coolant fluid on the O-rings.
-Place the small O ring inside the rail were it suppose to sit.
-Place the large O ring on the regulator.
-Place the regulator in and press gently until sited.
-Prime the rail before attempting to start.
-Check pressure.

A computer reset is not mandatory but it will take some time, 30 min of driving, to get the full effect. During that time the engine will work rich until a balanced A/F ratio is achieved.
The computer will adjust the injectors on time to the new flow/engine needs.

bootht99

i recently bought referbished ones that at tested off of a guy on ebay. they are a newer model of the mustang 5.0L injectors. they are 19lbs still. haven't received them yet.

the guy said he gets alot of jeep guys buying them.

Dsandine

So if I am reading all this info right, its best to measure flow rate in cc's, not psi? And I have a 93 so stock is 21.00 lb/hr @ 39 psi which would be 220.71 cc/min, so my best option is if I went with Bosch (or ford or whatever they are) 19 lb/hr (or 199.69 cc/min) it would be best to get adjustable fuel pressure regulator and run at around 47 psi to get me approximately 220 cc/min? I just will have exhaaust and intake so pretty much stock for now and don't want to through 19#'s in there with stock fuel pressure and run to lean or something.

coas

Not exactly.

There are two common methods to state injectors flow, one uses cubic centimeter per minute and the other use lb per hour.
The machinery that test injectors flow is calibrated in cc/min, so swutching to lb/hr is a calculation which obviusly will be less accurate as it take some assumptions.

As for the pressure, ALL injectors are tested at 43.5 PSI which is exactly 3 Bar. It does not say anything about the flow. It's a reference point for injectors comparison.

For instance, Jeep injectors 53030343, flow 248 cc/min @ 43.5 PSI. But at Jeep working pressure, 39 PSI, the flow is lower, its 235 cc/min. Meaning, the actual flow in a car is not necessarily the same as the test pressure.

Dsandine

I wasn't trying to state that they were rated as say 220 cc/min injectors, I probably didn't come across clear at all, basically I was just trying to see if I was to run injectors that are rated at 19 lbs/hr, I guess that would make them flow at 190 cc/min with jeep stock 39 psi, so if the 91-93 injectors flow 21 lbs/hr at 39 psi or 220 cc/min would it be better to get adjustable fuel pressure regulator and run the 19 lb/hr injectors at a higher psi to match stock flow, because unless I am seeing the math wrong stock flow is 220 cc/min @ 39 psi, and with stock fuel pressure regulator wouldn't the 19 lb/hr injectors only flow at 190 cc/min making the engine more lean? I think my math was off in first post also and would probably have to run higher than 47 psi at regulator if injector is rated 19 lb/hr at 3 bar and the stock is 21 lb/hr 39 psi, which would be like rated at like 22.25 lb/hr at 3 bar.

coas

At 39PSI, 210cc/min injector will flow 198cc/min. Stock Jeep injector will flow 235cc/min at the same pressure, 39psi.

Now, it look like a huge difference but if the 220cc/min injector is EV6 then less flow is needed, the better atomization utilize more fuel hence less fuel flow is needed. Which mean the older style injector is less efficient.

BUT, the difference, 235-198cc/min is way too big, the new injector will work on high duty cycle and a lean condition is probable.

So, a higher pressure is needed, as in your case. A pressure of 48 at WOT will yield 220cc/min which is acceptable.
On top of the above you'll also get better atomization which again, increase the fuel utilization, performance, lower emission...

As for the regulator to use, I don't see why an adjustable regulator is needed. you'll probably increase pressure to X point and there it will remain, it's not something you change often if ever.
A high pressure regulator, 4418850, will boost the pressure to 40-48psi and the computer will do the fine tuning. Not to mention it cost less than a third of the price.

Note, increasing pressure have it cost, the fuel pump will work harder than in stock pressure. 40-50 is still on the safe side, but more then that and the a high performance pump will be needed.
Or, if your current pump is on it last leg then the higher pressure will cause it to fail.

Neo101288

so what about the renox system do i have to run a regulator the the 4.6 fatty injectors

98 JeepJeep

I have the same exact injectors in mine and have no issues either...but i will be grabbing a high pressure regulator from that list and thrown it on to bring up the pressure....However isnt the Regulator on top of the fuel pump for a 98?

98 JeepJeep

i feel like if it ran lean enough to be a problem it would be picked up by the 02 sensors...and you would get a code...both banks......

coas

OBDII, 96 and up, runs on 49PSI constant, you don't need more pressure and anyway, you can't use that regulator.

A_Jeepr

WOW! im so confused by all this after reading 10 pages.....

Someone please PM me as to what would work on a '89 4.0 Renix....part # and application is all I want. Im confused enough already....

coas

Same as in OBDI, Neon injectors, 0280155703 , or one of the 210cc injectors with the high pressure regulator. In Renix you'll probably need changing fuel rail in order to use the high pressure regulator.

0280155703 Neon injectors and no other changes.
0280155710/700/746 and high pressure reg.+fuel rail.

The first, Neon injectors, will cost less.
The later will get better results but will cost more.

A_Jeepr

thank you a simple straightforward answer!