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Re: injectors
Posted: March 20th, 2011, 10:16 am
by WJ 2000
So, no one has said what size of injector you'll need for your 4.5 . So Iam a little confused on this issue
if you have a 4.5 and you'll need a 24lb injector, just to start off so Iam looking for a injector that fire's
24lb @ 39 psi @ CL and run's through 26 lb @ WOT @ 43 psi. So @ Open Loop my computer will self ajust
accordingly to my driving needs, I dont have a OBD2 or a piggy back, so I have to be for sure on which injector
I'am buying . So when I'am looking for a injector, I need a 24lb that max's out at 26 lbs, or starts out low
and max's out high, at 43 psi as fuel presure increase's ?
Re: injectors
Posted: March 20th, 2011, 12:42 pm
by gradon
Your 2K WJ has 22.5#@49psi injectors. 4.5l is 12.5% more displacement than a 4.0l. 22.5#x1.125=25.3#. You have ev6 connectors. An injector rated 24#@43.5psi will flow 25.5#@49psi(what your 00 jeep pressure is).
Re: injectors
Posted: March 20th, 2011, 1:28 pm
by WJ 2000
gradon wrote:Your 2K WJ has 22.5#@49psi injectors. 4.5l is 12.5% more displacement than a 4.0l. 22.5#x1.125=25.3#. You have ev6 connectors. An injector rated 24#@43.5psi will flow 25.5#@49psi(what your 00 jeep pressure is).
Great'' I need an injector that max's out at 25.3lbs @ 49psi and starts off at 24lbs at 43.5 psi Awesome
Thanks'' gradon
that helps alot
Re: injectors
Posted: March 20th, 2011, 4:05 pm
by 97_xj
You said you used the jeep53032704ab injectors to great avail. Is there a web site or link that I could take a look and possibly order some. I get the engine back this coming week and would like to have em ready to stick in being it is my daily driver and am tired of the hunk of crap I'm driving now. Thanks for you help.
Re: injectors
Posted: March 21st, 2011, 12:33 am
by Cheromaniac
WJ 2000 wrote:gradon wrote:Your 2K WJ has 22.5#@49psi injectors. 4.5l is 12.5% more displacement than a 4.0l. 22.5#x1.125=25.3#. You have ev6 connectors. An injector rated 24#@43.5psi will flow 25.5#@49psi(what your 00 jeep pressure is).
Great'' I need an injector that max's out at 25.3lbs @ 49psi and starts off at 24lbs at 43.5 psi Awesome
Thanks'' gradon
that helps alot
The Accel 24lb injectors are rated at 43.5psi so they'll do nicely. You'll just need to buy a set of EV1 to EV6 adapter plugs to make the injector harness fit.
Re: injectors
Posted: March 21st, 2011, 7:06 am
by Busey
Re: injectors
Posted: March 23rd, 2011, 7:37 am
by doublins
gradon wrote:The older Ford injectors(pre obd-2) with blue tops, metal bases, single pintles and ev1 connectors are rated 24#@39psi. Then they had all blue plastic skinnier injectors that are rated 24#@43.5psi, four pintles, with ev1 connectors, then there are the newer versions still rated 24#@43.5psi, four pintles and ev6 connectors. I've been running lt1 injectors rated 24#@43.5psi(25.5#@49psi) with black tops, silver metal bases, 6-pintles, and ev1 connectors. I tried the ford 24#@39psi(~27#@49psi) and for whatever reason my 96 4.6 didn't like them as much as the lt1s(I should've data-logged them to read the FTs). I would never use stock injectors(cranking up the map voltage with the 96-99 23.2#@49psi gray-tops might work), so would chose an injector that is 27#@49psi over them(even though they might be a tad rich in OL--the pcm will adjust in CL). For most obd2s, a 24#@43.5psi will work fine; for obd1s the 24#@39psi. I know this is against Chris' experience, but I'm not quick to write off a 27# injector, since I have maxed out the PSC1 trying to get my 25.5# down to 12.5:1 afr in 5th at WOT. And I have a 4.6l, so a 4.7l might absolutely need the 27#. 4.5l=12% more air, 4.6l=15% more air, 4.7l=17.5% more air. Jeep used different sized injectors from 19# in the 87-90 renixs, 21# for the 91-95 obd1s, 23.2# for the 96-99 obd2s, then 22.5# for the 00-01s. You want injectors that are 12%-17.5% larger than stock. 4.6 obd2 23.2#x1.15=26.7#; 4.7l obd2: 23.2#x1.175=27.26#.
I'm running the bolded injectors- they were used in Taurus V6s, Mustang 4.6s, and Crown Vic 4.6s- they run perfect in my 4.7L with no additional modification, the ford part # is F4DE-B5A
Re: injectors
Posted: March 23rd, 2011, 11:58 am
by gradon
Those are the injectors I'd recommend for most obd2 ev1 strokers with the 49psi rail--I need to trade out the older single pintle 24#@39psi blue tops in my m3 with those.
Re: injectors
Posted: March 28th, 2011, 6:16 pm
by rammit11
Has anyone tryed the ls1 injector Part#12482704 -flow 28.6#/hr at 58 psi, comes out to around 26.29#/hr on a 49 psi rail , on a 1998 based 4.6 stroker with 9.25 scr. I am on the last stages of my build and looking for some ideas on what seems to be the best fit without going to an auxillary engine controller system.
Re: injectors
Posted: March 28th, 2011, 6:49 pm
by blk01wj
What about 27# (true 26.6# at 49psi) with a 4.9 stroker? I ref to your write up below.
gradon wrote:The older Ford injectors(pre obd-2) with blue tops, metal bases, single pintles and ev1 connectors are rated 24#@39psi. Then they had all blue plastic skinnier injectors that are rated 24#@43.5psi, four pintles, with ev1 connectors, then there are the newer versions still rated 24#@43.5psi, four pintles and ev6 connectors. I've been running lt1 injectors rated 24#@43.5psi(25.5#@49psi) with black tops, silver metal bases, 6-pintles, and ev1 connectors. I tried the ford 24#@39psi(~27#@49psi) and for whatever reason my 96 4.6 didn't like them as much as the lt1s(I should've data-logged them to read the FTs). I would never use stock injectors(cranking up the map voltage with the 96-99 23.2#@49psi gray-tops might work), so would chose an injector that is 27#@49psi over them(even though they might be a tad rich in OL--the pcm will adjust in CL). For most obd2s, a 24#@43.5psi will work fine; for obd1s the 24#@39psi. I know this is against Chris' experience, but I'm not quick to write off a 27# injector, since I have maxed out the PSC1 trying to get my 25.5# down to 12.5:1 afr in 5th at WOT. And I have a 4.6l, so a 4.7l might absolutely need the 27#. 4.5l=12% more air, 4.6l=15% more air, 4.7l=17.5% more air. Jeep used different sized injectors from 19# in the 87-90 renixs, 21# for the 91-95 obd1s, 23.2# for the 96-99 obd2s, then 22.5# for the 00-01s. You want injectors that are 12%-17.5% larger than stock. 4.6 obd2 23.2#x1.15=26.7#; 4.7l obd2: 23.2#x1.175=27.26#.
Re: injectors
Posted: March 29th, 2011, 10:36 pm
by gradon
4.9l is 22.5% more displacement. Dunno what year your jeep is, so 96-99's 23.2#x1.225=28.42#. 00-01's 22.5#x1.225=27.56#
Re: injectors
Posted: March 31st, 2011, 10:26 am
by blk01wj
Sorry, 2001 GC. So based on you calcs I will be running a little lean? Or is it close enough?
gradon wrote:4.9l is 22.5% more displacement. Dunno what year your jeep is, so 96-99's 23.2#x1.225=28.42#. 00-01's 22.5#x1.225=27.56#
Re: injectors
Posted: March 31st, 2011, 1:11 pm
by unlimitedrubicon
Remember to verify your fuel pressure, not all 99+ systems are 49psi, my 2005 TJ is 60psi stock and changes fuel injector calculations considerably.
Re: injectors
Posted: March 31st, 2011, 1:13 pm
by blk01wj
BLAH!!! Thanks, I hate curveballs.
Re: injectors
Posted: March 31st, 2011, 6:11 pm
by SilverXJ
Yeah, thats not normal and should be fixed.