Did the injector swap...and WOW!
04-14-2010, 01:10 PM
#31
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Year: 1997
Model: Cherokee
Engine: I6
ok you cant do 80 miles then check and see how much mpg your getting, you have to run through the entire tank. i usually get 320 to a tank and i fill up as soon as the gas light comes on. which means i have about 2 gallons left in the tank so 320 divided by 18 = 17.7mpg. thats what i get with stock 3.55 gears, upgraded exhaust, CAI, 31's, APN header. plus i got front winch bumper and rear bumper. heavy!
04-14-2010, 02:06 PM
#32
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Year: 1989
Model: Cherokee
Engine: 4.0L I6
I've been reading threads here and there about injector swaps... Why is this news, I don't know... But here's a quick run-down to answer some questions I've seen posted here.
Both Neon and Jeep injectors are high Z (impedance), 19lbs/hr injectors. Older Jeeps (not sure till what years) along with 95-99 model year neons ran an EV1, single hole injector. 00-05 Neons run on an EV6, four hole injector. All are rated at the same 19 lbs/hr.
My concern with those of you taking injectors out of 2nd Gen (00-05 neons), is the injector length. Yes, the plug is different, and that's an easy fix (just splice in new injector connector). But depending on which fuel rail/intake manifold combo you have on your Jeep, you may be setting yourself up for failure with the new, shorter, EV6 type injector from the 2nd Gen Neon.
That said, I've pulled some EV6 injectors out of a newer jeep. The injector was longer than Neon injectors; and to my surprise, it only had one hole.
So for those of us with older Jeeps (mine is a '89), be mindfull of the size of the new injector compared to your old one. It may not fit properly into the intake manifold if it's too short (and as stated before, you'll have to solder in an EV6 injector clip). Those of you with newer jeeps that already have EV6 injectors, you just have to worry about injector length with the neon injectors.
And I don't want to rant, but I'm also concerned about fuel pressure... 2nd Gen Neons run at a higher fuel pressure than older Jeeps. My ('89) Jeep runs at 31 psi. I believe my 2nd Gen Neons fuel pressure is something like 45 psi... Maybe even in the 50s. I'll look into it and report back.
Both Neon and Jeep injectors are high Z (impedance), 19lbs/hr injectors. Older Jeeps (not sure till what years) along with 95-99 model year neons ran an EV1, single hole injector. 00-05 Neons run on an EV6, four hole injector. All are rated at the same 19 lbs/hr.
My concern with those of you taking injectors out of 2nd Gen (00-05 neons), is the injector length. Yes, the plug is different, and that's an easy fix (just splice in new injector connector). But depending on which fuel rail/intake manifold combo you have on your Jeep, you may be setting yourself up for failure with the new, shorter, EV6 type injector from the 2nd Gen Neon.
That said, I've pulled some EV6 injectors out of a newer jeep. The injector was longer than Neon injectors; and to my surprise, it only had one hole.
So for those of us with older Jeeps (mine is a '89), be mindfull of the size of the new injector compared to your old one. It may not fit properly into the intake manifold if it's too short (and as stated before, you'll have to solder in an EV6 injector clip). Those of you with newer jeeps that already have EV6 injectors, you just have to worry about injector length with the neon injectors.
And I don't want to rant, but I'm also concerned about fuel pressure... 2nd Gen Neons run at a higher fuel pressure than older Jeeps. My ('89) Jeep runs at 31 psi. I believe my 2nd Gen Neons fuel pressure is something like 45 psi... Maybe even in the 50s. I'll look into it and report back.
04-14-2010, 05:36 PM
#34
I've been reading threads here and there about injector swaps... Why is this news, I don't know... But here's a quick run-down to answer some questions I've seen posted here.
Both Neon and Jeep injectors are high Z (impedance), 19lbs/hr injectors.
no XJ 4.0l injector or neon injector flows 19 lbs /hr (19#), it is commonly stated on the web that the renix injectors are 19# but when flow tested on a proper rig coas got 240cc@43.5 psi~22.5#
So maybe on the renix definitely not on the rest of the fuel injected XJ's.
Older Jeeps (not sure till what years) along with 95-99 model year neons ran an EV1, single hole injector. 00-05 Neons run on an EV6, four hole injector. All are rated at the same 19 lbs/hr.
95-97 neons had a 4 hole ev6 injector with a EV1/ jettronic electric plug 208 155 703 = the one you want for pre 99 Xj's.
My concern with those of you taking injectors out of 2nd Gen (00-05 neons), is the injector length. Yes, the plug is different, and that's an easy fix (just splice in new injector connector). But depending on which fuel rail/intake manifold combo you have on your Jeep, you may be setting yourself up for failure with the new, shorter, EV6 type injector from the 2nd Gen Neon.
Injectors have part numbers cast on to the side of them. Check the part number before you pull it out of the wreck if it is the right part number it will work. 280 155 784 for 99-01 XJ's.
That said, I've pulled some EV6 injectors out of a newer jeep. The injector was longer than Neon injectors; and to my surprise, it only had one hole.
All xj's have pintal (single hole) injectors.
So for those of us with older Jeeps (mine is a '89), be mindfull of the size of the new injector compared to your old one. It may not fit properly into the intake manifold if it's too short (and as stated before, you'll have to solder in an EV6 injector clip). Those of you with newer jeeps that already have EV6 injectors, you just have to worry about injector length with the neon injectors.
There is no reason to F@#k about with soldering injector clips just get the right EV6 injector, Ev6 injectors came with ev1 (280 155 703) and UScar (280 155 784) electrical clips. if you want to fine,its your heap, but please do not tell others they have to.
part numbers again! right part number = plug and play.
And I don't want to rant, but I'm also concerned about fuel pressure... 2nd Gen Neons run at a higher fuel pressure than older Jeeps. My ('89) Jeep runs at 31 psi. I believe my 2nd Gen Neons fuel pressure is something like 45 psi... Maybe even in the 50s. I'll look into it and report back.
neons run @49 psi.
Renix run at 39 psi @WOT
OBD1 run at 39 psi @WOT
OBD2 run at 49 psi constant.
pressuredifferences are ok with ev6 / 4 hole injectors, could not do it with 1 hole injectors.
http://www.ausjeepoffroad.com/forum/...ad.php?t=92236
Both Neon and Jeep injectors are high Z (impedance), 19lbs/hr injectors.
no XJ 4.0l injector or neon injector flows 19 lbs /hr (19#), it is commonly stated on the web that the renix injectors are 19# but when flow tested on a proper rig coas got 240cc@43.5 psi~22.5#
So maybe on the renix definitely not on the rest of the fuel injected XJ's.
Older Jeeps (not sure till what years) along with 95-99 model year neons ran an EV1, single hole injector. 00-05 Neons run on an EV6, four hole injector. All are rated at the same 19 lbs/hr.
95-97 neons had a 4 hole ev6 injector with a EV1/ jettronic electric plug 208 155 703 = the one you want for pre 99 Xj's.
My concern with those of you taking injectors out of 2nd Gen (00-05 neons), is the injector length. Yes, the plug is different, and that's an easy fix (just splice in new injector connector). But depending on which fuel rail/intake manifold combo you have on your Jeep, you may be setting yourself up for failure with the new, shorter, EV6 type injector from the 2nd Gen Neon.
Injectors have part numbers cast on to the side of them. Check the part number before you pull it out of the wreck if it is the right part number it will work. 280 155 784 for 99-01 XJ's.
That said, I've pulled some EV6 injectors out of a newer jeep. The injector was longer than Neon injectors; and to my surprise, it only had one hole.
All xj's have pintal (single hole) injectors.
So for those of us with older Jeeps (mine is a '89), be mindfull of the size of the new injector compared to your old one. It may not fit properly into the intake manifold if it's too short (and as stated before, you'll have to solder in an EV6 injector clip). Those of you with newer jeeps that already have EV6 injectors, you just have to worry about injector length with the neon injectors.
There is no reason to F@#k about with soldering injector clips just get the right EV6 injector, Ev6 injectors came with ev1 (280 155 703) and UScar (280 155 784) electrical clips. if you want to fine,its your heap, but please do not tell others they have to.
part numbers again! right part number = plug and play.
And I don't want to rant, but I'm also concerned about fuel pressure... 2nd Gen Neons run at a higher fuel pressure than older Jeeps. My ('89) Jeep runs at 31 psi. I believe my 2nd Gen Neons fuel pressure is something like 45 psi... Maybe even in the 50s. I'll look into it and report back.
neons run @49 psi.
Renix run at 39 psi @WOT
OBD1 run at 39 psi @WOT
OBD2 run at 49 psi constant.
pressuredifferences are ok with ev6 / 4 hole injectors, could not do it with 1 hole injectors.
http://www.ausjeepoffroad.com/forum/...ad.php?t=92236
Last edited by rainman; 04-14-2010 at 07:22 PM.
04-14-2010, 07:16 PM
#37
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Year: 1990
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im sorry to bother you guys with another question but i ordered a set of the ford orange top, fat looking injectors because i thought i read on the ausjeepoffroad.com link that those ones would work on a renix xj but the chart thing says i need to up the fuel pressure. my question is will the fat orange tops work without modification or did make a mistake?
04-14-2010, 08:27 PM
#38
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Year: 1991
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Been lurking for quite a while and I followed Rainman's and Coas's advice and they are right on the money. Got 6 Neon injectors (Part #208 155 703 ) from the yard, replaced the o-rings, filters and pintle caps and installed them. Smoother idle, and a small increase in mpg for $48 total and about 2 hours total time. They know what they are talking about, all you have to do is follow that chart Rainman made up. Kudos guys!
04-14-2010, 09:11 PM
#40
im sorry to bother you guys with another question but i ordered a set of the ford orange top, fat looking injectors because i thought i read on the ausjeepoffroad.com link that those ones would work on a renix xj but the chart thing says i need to up the fuel pressure. my question is will the fat orange tops work without modification or did make a mistake?
They will work, Lots of people have done it. Just that they are a EV1.3 injector and if you are going to put new ones in you might as well put in EV6 injectors.
Also there is the flow rate of the renix injectors, Every where on the web it states that renix flow @ 18.6# so a 19# Ford will be the goods.
But when coas flow tested renix injectors he got 22.5# so what you gonna do?
I believe coas he has been spot on with everything he has said so far.
The tip sheet and my thread on Ausjeep reflect that.
I have looked there is a lot of False info written about flow rates of specific Injectors on the net.
In Australia we never got renix so over here it is not an issue.
04-15-2010, 08:28 AM
#41
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Year: 1997
Model: Cherokee
Engine: 4.0L
The injectors OP used are not in the table...did he just find another option? I have an 98 with a 99+ intake. I assume that the 703's would be best.
04-15-2010, 11:15 AM
#43
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Year: 1999
Model: Cherokee
Engine: 4.0L I6
I swapped out for Ford style injectors and noticed a small increase. I've had them for about a month, so the math is good. I originally got around 11-12 MPG and after the swap with the same driving habits I got 13.2 MPG. My last tank I drove it casually and got 15 MPG usually cruising around 1500 RPMs.
04-15-2010, 12:17 PM
#45
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They raise the fuel economy because of the spray pattern. Stock XJ injectors have one hole the fuel squirts out of. Neon injectors have 4 holes. That makes the fuel atomize better, thus equaling better mileage and throttle response. After I pulled my injectors out and looked at them, I'm surprised my Jeep even ran!