I've got 3 of those mods installed on my inline stroker. 1. Can confirm the Viper coil mod is great. 2. 4 hole injectors great bang for the buck. 3. The cover kit looks really nice and it's super easy to install. *I would like to add on with that clutch fan, having an oil cooler with a second fan helps a lot when your off Roading OR just stuck in traffic all the time. ESPECIALLY if you live in the south like I do (Florida).
Injectors were the best engine mod I did to my 4.0 I get 17-22mpg👌 Another engine mod I would add to the list is throttle body, the factory ones are so small
@@NajarOffroad www.amazon.com/BBK-1724-62mm-Throttle-Body/dp/B001GBRIKW This BBK 62mm is pretty much the most common on the market. Good size for off-roading l, you will definitely notice the improved throttle response especially with the new injectors
Ah, I've seen an ITB one it made good ho but had a bunch of mods. Never thought about throttle body. Did you have to tune for the injectors to get those mpgs, or any ecu changes?
The viper box is my next upgrade! I've been building my WJ for years! I was pumped when I saw that I can finally Chunk the godforsaken coil rail! I bet I've changed mine at least 5 times over the years!
I would also recommend getting a transmission cooler kit if you have a 4.0L that didn't come with a factory tow package, they have a tendency to burn the transmission without one and it also cuts out the possibility of getting coolant in the trans fluid if the stock style rad pops.
I did the K-Suspension 4-hole injectors a few months ago because the #3 injector suffered from the heat soak issue, then started failing. Also installed the heat shield kit from Design Engineering. Now no problems, better mileage and quicker throttle response. Well worth it! Thanks for your excellent videos! I have a 99 WJ.
I have one to add when it comes to the cooling and fan system. I've done this to my 2002 Jeep Grand Cherokee with the inline 6. My Jeep came with both the electric fans and the clutch five blade fan since it came with the factory tow hitch. The upgrade is relatively simple. And it will sound a little unorthodox. So check out the other videos on how to install it on youtube. What it is basically you take off that five blade fan that comes with the clutch fan. And you put on the clutch fan from a 4.0 V6 Ford engine. If bolts on. And then you screw it on to where the clutch fan would be. The suction power of that fan is so powerful. That my Jeep rarely goes ever over the middle temperature keep in mind I live in Las Vegas where we hit 110-120. Check out the videos and you'll see what I'm talking about relatively easy
I did it after the first year of owning the jeep. Like I said I live in Vegas. and what would happen if I ran the AC and I was at a stop sign. The needle would climb rapidly until I started moving. When I went to check it and look up on it that's when I found the video on youtube. And when I went to go actually do the change when I saw that I had both the electric fans and the clutch fan. Which turns out to be something that she put on all the Jeep Grand Cherokees that come with the tow hitch from the factory. Relatively easy mod you could actually get some of the parts from AutoZone to rent to be able to do that to the clutch. There's a few videos. It works so well that I actually had to change the thermostat cuz I kept getting a check engine light for the engine running or staying too cool.
@@edeno328 ive done the same upgrade on a 99 Wj 4.7 limited, but still have issues with heat soak. Being in a high temp state(tx) do you recommend any other upgrades?
@@chillsolo8280 On the I6 you can put a timer on the eletric fan triggered by a thermostat. Even with the insulation kit the fuel line still gets quite hot. Those cats sitting right there. If the intake and fuel lines could have been on the passenger side, I wonder how much more horsepower the engine could have developed? But then oil changes would have been more difficult.
If you know a HVAC guy get some of the copper piping insulation - it’s aluminum coated, and has a foam insulator technology - cut it to the length of your fuel injector rail, cut a line down the middle of the HVAC tube insulation from top to bottom, and put it around the rain and use zip ties to hold it in place. Works great for heat soak
I got four hole injectors from injector rehab about a year ago, they came with a before and after flow bench test that even included ohm's of resistance. They are perfectly balanced didn't notice any power but picked up 1 mpg so they pay for themselves over time.
GM 11 blade fan works very well, also a header, can remove your after cats in a new exhaust and muffler without throwing a CEL. Ksuspenension viper coil packworks very well, alot mire convenient than the stock rail, thumbs up on the 12 holers as well. Thought your mods would be stupid ones, spot on
I’ve got the rail cover kit on mine. It will eventually let the heat soak through but it takes a lot more time. Upgrade the fuel pump with heat shield should prevent vapor locking for the most part
Replacing the injectors is going to be an improvement regardless of 1 or 4 hole if they are old and clogged. I did find rebuilt 4 hole ones for a Caravan at a good price and will be installing them soon. Battery Cables USA allows you to order cables any length, with your choice of end connectors, at a great price.
Good video but I suggest buying a tripod bro. Too much wiggling around messes with the eyes. The upgraded injectors didn't work for my ZJ so I went back to stock and now it now works fine. Upgrade injectors sometimes flood your engine with too much fuel. Like the heat soak idea and had just looked at that cat right before I saw your video. Going to try that out. How's that coil pack upgrade running for you so far cuz I wouldn't mind trying that out too.
The radiator is no longer available do you have an option or another option you suggest because I’ve been looking for one for a long time I found one quick and easy in San Antonio for my Jeep YJ my 94 jeep YJ a long time ago I’ve got a kick ass radiator in that thing and I’ve been trying to find one for my WJ my 2000 W J. to no avail if you have a place to get one I would love the tip hook a brother up
my wj sometimes has a problem where if my lights are on i get a weird scraping sound from my trans and i think it’s do to power would the big 7 kit help with that?
That radiator from jegs had been on back order. I ordered mine last October and they are saying now that it wouldn't be done till this September. I had to cancel and the order and the one I got has the plastic tanks and I lifetime warranty
So when I unplug my master switch and run it with it unplugged my gauges and windows work and stuff but when I plug it back in and start going down the road again all my guages and windows will kick on and off. What could that be do ya think?
Mine was 2002 and i lost the head gasket. I tried to replace it myself but I chickened out and there was so much rot underneath, that I junked it. Saddest day ever.
What's a good long term vision, mod/rebuild the I-6 or attempt an LS swap? Hate to lose the reliability and toughness of the I-6, but would love some added horsepower and get up. Spec-D has that aluminum radiator for like $150 on Amazon. Did you get the basic Viper coil mod or the supercharger version?
I don’t know that’s up to you😂 I think it might be easier fixing the I6 but I’m not sure haha. Oh nice! The one I linked was recommended to me by someone who did the swap! I got the basic viper coil mod!
Love your upgrades. I'm modding for reliability, power and economy. I plan to get the fuel rail insulation, upgrade the steering and brakes (from a V8 model) and will consider the coil pack, but know nothing about those yet. Need to connect with Jeepers in my area, as I'm new to Jeeping. Have you considered a set of roller rockers, to improve mileage, power, and engine life? I was going to run synthetic oil in mine, until I learned it can't take the high pressure/friction on the lifters/cams/push rods. I had planned to put in a zinc additive to handle the friction, but that clogs the catalytic converter. So I'm saving my pennies for a set of roller rockers. Then I can run synthetic and have a bullet-proof straight six. Thanks!
OH! And my four hole injectors and 130 amp alternator are in the mail! And mine only has the clutch fan, so I'm leaning towards a pair of electrics, to increase cooling and power.
Depends on what you plan to run on the jeep! I rather have a thicker set to future proof other projects! Amps matter when going through the stock wires vs Jeep cables 2 gauge
He has a great build .You need to go to Florida and check out mich gills .he has a hemi in his build .I alive the still bumpers .Iam getting ready to order new bumpers
I've got 3 of those mods installed on my inline stroker.
1. Can confirm the Viper coil mod is great.
2. 4 hole injectors great bang for the buck.
3. The cover kit looks really nice and it's super easy to install.
*I would like to add on with that clutch fan, having an oil cooler with a second fan helps a lot when your off Roading OR just stuck in traffic all the time.
ESPECIALLY if you live in the south like I do (Florida).
Nice can’t wait to get my injector and cover kit in! I hope it helps with MPGs atleast 1😂 I’m at 10.9
Injectors were the best engine mod I did to my 4.0 I get 17-22mpg👌
Another engine mod I would add to the list is throttle body, the factory ones are so small
I can’t wait for mine to come in! Oh I haven’t done research on the Throttle body but that would be a good one! What do you recommend for that?
@@NajarOffroad www.amazon.com/BBK-1724-62mm-Throttle-Body/dp/B001GBRIKW
This BBK 62mm is pretty much the most common on the market. Good size for off-roading l, you will definitely notice the improved throttle response especially with the new injectors
4 or 12 hole injectors?
12
Ah, I've seen an ITB one it made good ho but had a bunch of mods. Never thought about throttle body. Did you have to tune for the injectors to get those mpgs, or any ecu changes?
The viper box is my next upgrade! I've been building my WJ for years! I was pumped when I saw that I can finally Chunk the godforsaken coil rail! I bet I've changed mine at least 5 times over the years!
I would also recommend getting a transmission cooler kit if you have a 4.0L that didn't come with a factory tow package, they have a tendency to burn the transmission without one and it also cuts out the possibility of getting coolant in the trans fluid if the stock style rad pops.
Oh that’s a good mod! Will definitely look into it
Do u have the link to a good cooler kit
@@sergiogomez170 if you find one let us know
Removing the check valve in the cooler line is more important then a cooler
I did the K-Suspension 4-hole injectors a few months ago because the #3 injector suffered from the heat soak issue, then started failing. Also installed the heat shield kit from Design Engineering. Now no problems, better mileage and quicker throttle response. Well worth it! Thanks for your excellent videos! I have a 99 WJ.
99 wj 💪
I have one to add when it comes to the cooling and fan system. I've done this to my 2002 Jeep Grand Cherokee with the inline 6. My Jeep came with both the electric fans and the clutch five blade fan since it came with the factory tow hitch. The upgrade is relatively simple. And it will sound a little unorthodox. So check out the other videos on how to install it on youtube. What it is basically you take off that five blade fan that comes with the clutch fan. And you put on the clutch fan from a 4.0 V6 Ford engine. If bolts on. And then you screw it on to where the clutch fan would be. The suction power of that fan is so powerful. That my Jeep rarely goes ever over the middle temperature keep in mind I live in Las Vegas where we hit 110-120. Check out the videos and you'll see what I'm talking about relatively easy
I have read up on it! Definitely something I want to do since electric fans do go out!
I did it after the first year of owning the jeep. Like I said I live in Vegas. and what would happen if I ran the AC and I was at a stop sign. The needle would climb rapidly until I started moving. When I went to check it and look up on it that's when I found the video on youtube. And when I went to go actually do the change when I saw that I had both the electric fans and the clutch fan. Which turns out to be something that she put on all the Jeep Grand Cherokees that come with the tow hitch from the factory. Relatively easy mod you could actually get some of the parts from AutoZone to rent to be able to do that to the clutch. There's a few videos. It works so well that I actually had to change the thermostat cuz I kept getting a check engine light for the engine running or staying too cool.
@@edeno328 ive done the same upgrade on a 99 Wj 4.7 limited, but still have issues with heat soak. Being in a high temp state(tx) do you recommend any other upgrades?
No I'm not familiar with the V8
@@chillsolo8280 On the I6 you can put a timer on the eletric fan triggered by a thermostat. Even with the insulation kit the fuel line still gets quite hot. Those cats sitting right there.
If the intake and fuel lines could have been on the passenger side, I wonder how much more horsepower the engine could have developed? But then oil changes would have been more difficult.
How about put some more stickers for more horsepower
That video is coming out Friday 😜
The problem is, they add weight 🤔
I did that but that … ending u getting more middle fingers than hp 😂
If you know a HVAC guy get some of the copper piping insulation - it’s aluminum coated, and has a foam insulator technology - cut it to the length of your fuel injector rail, cut a line down the middle of the HVAC tube insulation from top to bottom, and put it around the rain and use zip ties to hold it in place. Works great for heat soak
I got four hole injectors from injector rehab about a year ago, they came with a before and after flow bench test that even included ohm's of resistance. They are perfectly balanced didn't notice any power but picked up 1 mpg so they pay for themselves over time.
Jeep Liberty has the 4 hole injector an will plug right into your harness in the 1999 Jeep Grand Cherokee
GM 11 blade fan works very well, also a header, can remove your after cats in a new exhaust and muffler without throwing a CEL. Ksuspenension viper coil packworks very well, alot mire convenient than the stock rail, thumbs up on the 12 holers as well. Thought your mods would be stupid ones, spot on
Anything GM is an improvement upon the inferior brands.
I’ve got the rail cover kit on mine. It will eventually let the heat soak through but it takes a lot more time. Upgrade the fuel pump with heat shield should prevent vapor locking for the most part
Replacing the injectors is going to be an improvement regardless of 1 or 4 hole if they are old and clogged. I did find rebuilt 4 hole ones for a Caravan at a good price and will be installing them soon.
Battery Cables USA allows you to order cables any length, with your choice of end connectors, at a great price.
Just starting to upgrade my Jeep definitely will be coming back to these videos
New sub
that picture at the end of your video of wjmedic is one of my offroad crusaders here in fl thats awesome
Haha no way! He has a sick build!
@@NajarOffroad yes and hes upgrading the axles to
Awesome video man! Thanks for the tips, I need to do all of these.
Thanks man! I’ll be making videos on it soon!
i own LIMITED and have 270k V8 all stock except tyres. Good ole reliable. cheers
Yea you r right all off these mods help I 6 engine fuel pressure regulator help alot
Thanks for the shout out! Videos lookin good! I have the v8 but still useful info!
There's an injector mod for the V8 as well
Your like me new best friend.... got my 2001 JGC and you are like THE GUY! Thank you
Put a turboski on my 4.0 now she loves off roadin also mishimoto makes a aluminum radiator truck never gets hot now
Those coils are cool. Thanks 👍
Good video but I suggest buying a tripod bro. Too much wiggling around messes with the eyes. The upgraded injectors didn't work for my ZJ so I went back to stock and now it now works fine. Upgrade injectors sometimes flood your engine with too much fuel. Like the heat soak idea and had just looked at that cat right before I saw your video. Going to try that out. How's that coil pack upgrade running for you so far cuz I wouldn't mind trying that out too.
Msd coilpack is awesome too. And CA compliant
The radiator is no longer available do you have an option or another option you suggest because I’ve been looking for one for a long time I found one quick and easy in San Antonio for my Jeep YJ my 94 jeep YJ a long time ago I’ve got a kick ass radiator in that thing and I’ve been trying to find one for my WJ my 2000 W J. to no avail if you have a place to get one I would love the tip hook a brother up
Looks like someone has already done these on mine prior to me getting it except for the suspension and wiring.
Your radiator link goes to an EOM plastic radiator, FYI.
Idk why Amazon Allows this but sometimes the sellers can change the product and use the same link🤦♂️
Could you give us your mod list?
Yea I’m working on that on my blog Najaroffroad.com but also some of the mods are listed in the description
Explain to me how can you put a Viper Box if it doesn't come with spark plug wires
You did a video on how to repair your seat upholstery how do I get that video
my wj sometimes has a problem where if my lights are on i get a weird scraping sound from my trans and i think it’s do to power would the big 7 kit help with that?
That radiator from jegs had been on back order. I ordered mine last October and they are saying now that it wouldn't be done till this September. I had to cancel and the order and the one I got has the plastic tanks and I lifetime warranty
So when I unplug my master switch and run it with it unplugged my gauges and windows work and stuff but when I plug it back in and start going down the road again all my guages and windows will kick on and off. What could that be do ya think?
Took it to a garage and they told me body control module butt I replaced that
I would check the wires in the boot ont the driver side door sometimes the wires break and cause weird stuff to happen
What is the radiator I need??!?!
Can you delete torque converter Management on the inline 6
What size cables are those? Im trying to order mines now
Have you ever had DW in your jeep
OMG do I want another WJ I6. Question for you, which of the WJ models came with the selecta-track tranny? What is your tranny preference?
Mostly the ones with I6 some V8s came with it but rarely. Mines a Laredo and came with it
Mine was 2002 and i lost the head gasket. I tried to replace it myself but I chickened out and there was so much rot underneath, that I junked it. Saddest day ever.
You can only get the 42RE transmission in the I6. Select-Trac mates with the NV242 transfer case.
What's a good long term vision, mod/rebuild the I-6 or attempt an LS swap? Hate to lose the reliability and toughness of the I-6, but would love some added horsepower and get up. Spec-D has that aluminum radiator for like $150 on Amazon. Did you get the basic Viper coil mod or the supercharger version?
I don’t know that’s up to you😂 I think it might be easier fixing the I6 but I’m not sure haha. Oh nice! The one I linked was recommended to me by someone who did the swap! I got the basic viper coil mod!
stroke it!
Want a Chevy? Buy a Chevy. Jeep is 4.0 and 4.0 is JEEP.
Stroker motor. Cam. Turbo, etc. Upgrade, use and protect. It's a legend.
Swap a 318 if you want more power
Looking for some affordable copper/bronze colored wheels for my WJ, any suggestions?
RockTrix has lots of options and affordable
Love your upgrades. I'm modding for reliability, power and economy.
I plan to get the fuel rail insulation, upgrade the steering and brakes (from a V8 model) and will consider the coil pack, but know nothing about those yet. Need to connect with Jeepers in my area, as I'm new to Jeeping.
Have you considered a set of roller rockers, to improve mileage, power, and engine life? I was going to run synthetic oil in mine, until I learned it can't take the high pressure/friction on the lifters/cams/push rods. I had planned to put in a zinc additive to handle the friction, but that clogs the catalytic converter.
So I'm saving my pennies for a set of roller rockers. Then I can run synthetic and have a bullet-proof straight six.
Thanks!
OH! And my four hole injectors and 130 amp alternator are in the mail! And mine only has the clutch fan, so I'm leaning towards a pair of electrics, to increase cooling and power.
Where can I find the injector cover insulation covers
Did you go from 4 gauge to 2 gauge for your battery cables?
I believe I got the 2 gauge
How do I delete the tcm in the 6cyl
Can you swap that front bumper and grill with a limited ???
Yes sir
What does it mean 4 and 12 injectors can i do either one on my 4.0 ?
When looking for the new cables is it best to get the 4guage or 2guage?
Depends on what you plan to run on the jeep! I rather have a thicker set to future proof other projects! Amps matter when going through the stock wires vs Jeep cables 2 gauge
Curious if you would add a performance chip what chip would u use.
What about a higher flow thermostat housing?
He has a great build .You need to go to Florida and check out mich gills .he has a hemi in his build .I alive the still bumpers .Iam getting ready to order new bumpers
I've done all of these except viper coil and aluminum radiator
Don’t do the viper mod.what better is the msd coil pack
Hey bro do you live in Vegas ?
Yes I do
Message me on Instagram @najaroffroad
What's your suspension/axle/tire setup?
Does anybody do a high stall torque converter?
Can you do the V8?
Tire size and lift?
sheeeeeeeesh!!
As soon as he said V8 I left 😂
Poor V8's being left out all of the time...
Hey you can either have the horsepower or have the love. Gotta pick one. Lol
😂 the v8 have good power I won’t lie! Maybe we should pick up a junk one and restore it on the channel?
@@NajarOffroad pls
Love it, love it, love it!!! Best car ever created!
And what's more? Jeep is now partly owned by Dongfeng of China #MadeInChina2025 #BeltAndRoad 🇨🇳
Crap I have the v8😭
I want one for the channel 🥲
4.7 wjs y’all don’t belong here🤬🤬🤬
😂😂 now that we have a 4.7 I’ll make these type of videos for it
You gave absolutely no clues on how or why 😡
The best mod is replacing the inline 6 with a v8