Raven Posted October 8, 2020 Share Posted October 8, 2020 These are the ones I’ve chosen to use in the 1998 4.0. Thoughts? Link to comment Share on other sites More sharing options...
MiNi Beast Posted October 8, 2020 Share Posted October 8, 2020 still 4 hole.....why? have you done any upgrades to justify the extra fuel? are you just replacing stock ones for better ones? I'm still awaiting injectors to see if will make a difference from the 5 i have working currently. I'm still all stock just looking for some clean functional ones. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 8, 2020 Share Posted October 8, 2020 @MiNi Beast They’re on their way . @Raven what is this going on? Those injectors you posted are basically stock injectors but with a 4 hole setup for better atomization for a 91-95 HO setup where you have 39psi at the rail at wot. Link to comment Share on other sites More sharing options...
75sv1 Posted October 8, 2020 Share Posted October 8, 2020 I've used 4-holes on two '98 XJs. They were Ford, that had been cleaned and rebuilt, but not matched. The both engines ran smoother. I noticed no power gain, nor MPG gain. Maybe a bit better drive ability. I presently have 12 hole injectors on one of the '98 XJs and a 2000. Initially, I noticed a power gain on the '98. I had issues with spark plugs though. Possibly a bit on MPG. Link to comment Share on other sites More sharing options...
Raven Posted October 8, 2020 Author Share Posted October 8, 2020 I’m interested in a smoother running motor. Hoping for a couple more mpg with better atomization. Link to comment Share on other sites More sharing options...
Raven Posted October 8, 2020 Author Share Posted October 8, 2020 I’ve no intentions of moding this motor for more power. This one is just to tune the motor for better efficiency. Just replace parts with better parts. Y’all know the drill. Car companies get vehicles made with the cheapest parts available at the time to save manufacturing costs. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 8, 2020 Share Posted October 8, 2020 What is this going on and what year electronics are you running? Link to comment Share on other sites More sharing options...
Raven Posted October 8, 2020 Author Share Posted October 8, 2020 1988 MJ 97+ conversion. I’m using the complete drivetrain, electronics with wiring harnesses. It a complete conversion using everything off an 1998 donor XJ. Five inch lift with 32’s for now. AW4 with np242. Link to comment Share on other sites More sharing options...
75sv1 Posted October 8, 2020 Share Posted October 8, 2020 I am running a similar setup on an XJ. I have regeared to 4.10's. I originally was running 31's. I have a 'sort of' 2.5 inch exhaust and header. Also, a '00+ intake. Then I bored out the TB to 60mm. Latter I installed a BK 62MM TB. I thought the 60MM ran better. I do have Falken Wild Peaks metric equivalents of 32"s. I sort of feels it needs 4.30 gears. Possibly an issue with the trans. I see a few other XJ owners who run a stroker and 32's. They seem happy with that. I'll be doing that on the next XJ build. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 8, 2020 Share Posted October 8, 2020 10 hours ago, Raven said: 1988 MJ 97+ conversion. I’m using the complete drivetrain, electronics with wiring harnesses. It a complete conversion using everything off an 1998 donor XJ. Five inch lift with 32’s for now. AW4 with np242. So are you running the return less fuel system with the fpr in the tank? Or are you running an external fpr? If so, what pressure are you setting it to? Your harness should be for ev6 connectors not ev1. I’d grab an HP tuner and license and start tuning that engine my self or grab Chris from christuned to get it tuned for you remotely. That will make for the most efficient running engine Link to comment Share on other sites More sharing options...
Raven Posted October 9, 2020 Author Share Posted October 9, 2020 I thought it was just a simple swap? Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 9, 2020 Share Posted October 9, 2020 Your going to an obd2 setup which runs a return less fuel rail with a fpr in the tank set to 49psi. Are you going to go with that system or work with an HO style stock system? If you install those injectors with the higher fuel rail pressure your injectors will be quite oversized. Any obd2 swap is complex but quite doable (but I wouldn’t call it a simple swap). Just let us know what you will be running for fuel system (fuel rail, fpr/sender) Link to comment Share on other sites More sharing options...
Cummins93 Posted October 9, 2020 Share Posted October 9, 2020 The JTEC will compensate for those size injectors. I second giving Chris a call, he can do quite a bit to the proramming of these ECUs. If you are looking for just bolt on and go stuff that is understandable as well. I do sell injectors 4 or 12 hole, bored TBs and crank sensors. Let me know if I can help you out. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 9, 2020 Share Posted October 9, 2020 1 hour ago, Cummins93 said: The JTEC will compensate for those size injectors. I second giving Chris a call, he can do quite a bit to the proramming of these ECUs. If you are looking for just bolt on and go stuff that is understandable as well. I do sell injectors 4 or 12 hole, bored TBs and crank sensors. Let me know if I can help you out. I’d still recommend getting closer to the right injector size but need to know your fuel system first. If you run the obd2 fuel setup your ecu will have quite a fuel trim. @Cummins48 interested in the crank sensors you have. Would like to advance timing on my HO motor before socketing the ecu. Link to comment Share on other sites More sharing options...
Cummins93 Posted October 9, 2020 Share Posted October 9, 2020 Feel free to PM with any questions or requests. Ill get back to you with some fuel trims. Link to comment Share on other sites More sharing options...
Raven Posted October 10, 2020 Author Share Posted October 10, 2020 This will become my daily driver. I will be using OBD2... yes on returnless fuel line. I just want to replace as much bolt on stuff that is better and more efficient than what was used from the factory. I’m not seeking power gains. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 10, 2020 Share Posted October 10, 2020 10 minutes ago, Raven said: This will become my daily driver. I will be using OBD2... yes on returnless fuel line. I just want to replace as much bolt on stuff that is better and more efficient than what was used from the factory. I’m not seeking power gains. If your running the return less system than I’m assuming fpr in the tank and 49psi at the rail. These are the wrong injectors for you. You will be overfueled. Not that the ecu can’t eve learn the new injectors but the injector pulse width will need to be a good amount below spec. You need injectors that flow about 21ish lbs @49psi for a stock engine. Link to comment Share on other sites More sharing options...
Raven Posted October 10, 2020 Author Share Posted October 10, 2020 17 minutes ago, ghetdjc320 said: If your running the return less system than I’m assuming fpr in the tank and 49psi at the rail. These are the wrong injectors for you. You will be overfueled. Not that the ecu can’t eve learn the new injectors but the injector pulse width will need to be a good amount below spec. You need injectors that flow about 21ish lbs @49psi for a stock engine. I’ve been using this website to figure out which injectors work best with the engine I’m using. http://www.ausjeepoffroad.com/forum/showthread.php?t=92236 Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 10, 2020 Share Posted October 10, 2020 Good info . The ones in the link you posted will get you overfueled though. You can use ev6 injectors also with adapters. I run Ford purple injectors which are ev6 6 hole injectors and 24lbs @ 39psi. Link to comment Share on other sites More sharing options...
Raven Posted October 11, 2020 Author Share Posted October 11, 2020 Ok.... I will look into the Ford injectors. What is the part number? Thanks everyone Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 11, 2020 Share Posted October 11, 2020 2 hours ago, Raven said: Ok.... I will look into the Ford injectors. What is the part number? Thanks everyone I don’t recommend the fords for your setup, that’s just for my engine which is built quite different. They would be like 30+lbs on you 49psi obd2 setup. Run stock injectors or use this as a guide: http://jeep4.0performance.4mg.com/custom3.html You need approximately a 20.4lb injector @ 3 bar (43.5 psi) to get that 23lb stock injector size (assuming the 98 ecu is used) 3 bar is what most injector flow rates are measured at. 43.5/49=.88 so if your trying to get the 23 lbs stock injectors then you’ll need something rated about 20.4 (I’d shoot for a 21lb injector at 3 bar). You’ll be slightly overfueled but can always trim that in the ecu. Link to comment Share on other sites More sharing options...
Raven Posted October 17, 2020 Author Share Posted October 17, 2020 I will be using the factory 98 stock ecm Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now