ggcnash Posted January 8, 2017 Share Posted January 8, 2017 Hi guys I have sold the 4.0 in the 91 with harness, to a fellow member to swap his 89 to h.o. wanting to make sure I get everything the young man needs any tips or advice would be appreciated, I'm assuming the main harness, and gauge harness with pcm is all that's needed? Sent from my SAMSUNG-SM-G890A using Tapatalk Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 8, 2017 Share Posted January 8, 2017 By harness do you mean both the engine bay, cross-body, and dash harnesses? The 91 has a one-of-a-kind firewall connector. Plus you will have the polarity difference with the fuel gauge as I'm sure you know. Link to comment Share on other sites More sharing options...
ggcnash Posted January 8, 2017 Author Share Posted January 8, 2017 By harness do you mean both the engine bay, cross-body, and dash harnesses? The 91 has a one-of-a-kind firewall connector. Plus you will have the polarity difference with the fuel gauge as I'm sure you know.Don he is basically wanting to convert his 89 to h.o I will not be needing the engine harness and will be using aftermarket gauges in the ls swap. I am not as diverse in the renix jeeps so I just wanted to make sure he has what he needs, I'm sure he can pull minor generic stuff at JY from xj just wanted to make sure their is nothing specific I'm missing Sent from my SAMSUNG-SM-G890A using Tapatalk Link to comment Share on other sites More sharing options...
Eagle Posted January 8, 2017 Share Posted January 8, 2017 He will also need the '91 fuel level sender from the tank, and he'll have to deal with the reversed polarity of the fuel gauge. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 9, 2017 Share Posted January 9, 2017 Don he is basically wanting to convert his 89 to h.o I will not be needing the engine harness and will be using aftermarket gauges in the ls swap. I am not as diverse in the renix jeeps so I just wanted to make sure he has what he needs, I'm sure he can pull minor generic stuff at JY from xj just wanted to make sure their is nothing specific I'm missing That's what I mean. To convert the Renix fairly easily he'll also need the dash and cross body harness from an HO, along with the complete HO engine harness with the PDC. He will also need the '91 fuel level sender from the tank, and he'll have to deal with the reversed polarity of the fuel gauge. I think I mentioned that. Link to comment Share on other sites More sharing options...
ggcnash Posted January 9, 2017 Author Share Posted January 9, 2017 I will be pulling the 4.0 this weekend and I will verify what I need and don't and go from there Sent from my SAMSUNG-SM-G890A using Tapatalk Link to comment Share on other sites More sharing options...
oldseddie Posted January 9, 2017 Share Posted January 9, 2017 I didn't see it mentioned but flywheel is different. Sent from my Nexus 5X using Tapatalk Link to comment Share on other sites More sharing options...
cruiser54 Posted January 9, 2017 Share Posted January 9, 2017 Yep. Easiest to just do this. All the work of re-wiring etc is not worth the minimal gain: http://cruiser54.com/?p=100 HO myth buster Renix in 90 made 182 HP. HO in 91 made 190 HP. That's 8 HP difference. HO only made more HP than Renix at higher RPMs and not a bit more torque. HO had a 58 mm throttle body versus a 52 mm throttle body on a Renix. That’s 20% more air available through the HO throttle body. The HO also had a better design header. See where I'm going with this? It’s only a 4% horsepower increase….. The whole 8HP was not mostly from the head, but from the bigger TB and better exhaust manifold. Put a 60mm TB from www.strokedjeep.com on your present manifold using the Renix head, eliminate the "crush" in your headpipe with proper re-routing, and go for it. HO stands for Highly Overrated. __________________ Link to comment Share on other sites More sharing options...
JeepComanche89 Posted January 15, 2017 Share Posted January 15, 2017 I'm the buyer of the engine and harness. Yes I know that there are other ways to convert to a HO motor, but I'm only interested in doing the complete harness swap. Before everyone chimes in, I have done all of cruisers tips, and I know its not a real hp gain, I'm just looking to ditch the entire renix setup as I am just not a fan. IMO the HO setup is alot cleaner. That being said I believe I need the engine harness, and the under the dash harness, and PCM. The engine harness should plug into the lower dash harness witch eliminates the connector issue. Also, there's the fuel pump issue. I believe I would need the wires that go to the fuel pump, and a 91 comanche sending unit. (I'm not quite sure if there's anyway around this) ggcnash is including all of the sensors with the engine, so none of that should be an issue. I also have a a 91 gauge cluster. And it should be noted a have an AX-15, so I think I am able to just not use or cut out his automatic transmission wiring completely. So, in review a PCM, engine bay harness and dash harness are definite, a HO comanche specific fuel pump harness and sending unit may also be necessary. Thats my understanding, how does that sound to you guys? Link to comment Share on other sites More sharing options...
JeepComanche89 Posted January 15, 2017 Share Posted January 15, 2017 I didn't see it mentioned but flywheel is different. Sent from my Nexus 5X using Tapatalk I have a AX-15 from a 95 XJ in my comanche now. I am running a flywheel from my 88 with a peugot. Would a flywheel from the 95 XJ, work with the 91 comanche HO cps and computer? what do you guys think? Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 15, 2017 Share Posted January 15, 2017 Would a flywheel from the 95 XJ, work with the 91 comanche HO cps and computer? what do you guys think? Yes. The 91-95 HO flywheels are the same. Link to comment Share on other sites More sharing options...
JeepComanche89 Posted January 16, 2017 Share Posted January 16, 2017 Would a flywheel from the 95 XJ, work with the 91 comanche HO cps and computer? what do you guys think? Yes. The 91-95 HO flywheels are the same. Awesome, thanks! I'm assuming I would need to get a CPS for a 91, 5 speed comanche though? As I believe I mentioned before ggcnash's truck is an automatic Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 16, 2017 Share Posted January 16, 2017 The 91 CPS doesn't care if the tranny is auto or manual as long as it has the correct HO flexplate or flywheel respectively to communicate with. Link to comment Share on other sites More sharing options...
JeepComanche89 Posted January 16, 2017 Share Posted January 16, 2017 The 91 CPS doesn't care if the tranny is auto or manual as long as it has the correct HO flexplate or flywheel respectively to communicate with. Awesome, thanks again. I thought the markings were different, my mistake Link to comment Share on other sites More sharing options...
kook911 Posted January 16, 2017 Share Posted January 16, 2017 I am also about to do this swap also and since this thread is already started I thought I would just jump in and ask my questions and make sure I got what I need to do this. I have a 87 Ba10 4.0 4x4 and I have a 91 Ax15 4.0 4x4. The question I have on the flywheel do I need to 87 or the 91? I am also swapping in the motor and doing the curiser54 tips on the Renix to HO swap. I also just plan to pull out the drive train as one unit and not plan on separating them. Since the motor is out I will also be swapping the motor mounts. Anything else I should know? Link to comment Share on other sites More sharing options...
kook911 Posted January 16, 2017 Share Posted January 16, 2017 He will also need the '91 fuel level sender from the tank, and he'll have to deal with the reversed polarity of the fuel gauge. On the 91 cherokee I bought it has a 89 Comanche fuel tank. It works but at full tanks it reads half and empty it reads well below empty. So is this because of the reversed polarity? Link to comment Share on other sites More sharing options...
Hippie66 Posted January 16, 2017 Share Posted January 16, 2017 He will also need the '91 fuel level sender from the tank, and he'll have to deal with the reversed polarity of the fuel gauge. On the 91 cherokee I bought it has a 89 Comanche fuel tank. It works but at full tanks it reads half and empty it reads well below empty. So is this because of the reversed polarity? No. Reverse polarity will read full when empty, empty when full. Link to comment Share on other sites More sharing options...
JeepComanche89 Posted January 16, 2017 Share Posted January 16, 2017 I am also about to do this swap also and since this thread is already started I thought I would just jump in and ask my questions and make sure I got what I need to do this. I have a 87 Ba10 4.0 4x4 and I have a 91 Ax15 4.0 4x4. The question I have on the flywheel do I need to 87 or the 91? I am also swapping in the motor and doing the curiser54 tips on the Renix to HO swap. I also just plan to pull out the drive train as one unit and not plan on separating them. Since the motor is out I will also be swapping the motor mounts. Anything else I should know? I'm almost certain you will need whatever flywheel that matches the year group computer you are running. Sounds like to me you would need the 87 if you are leaving your wire harness and comp. and doing the cruiser conversion. On a side note I just started a thread discussing weather or not to mill xj/mj flywheels. Theres some debate on that, you may want to look at that before you make a decision Link to comment Share on other sites More sharing options...
JeepComanche89 Posted January 31, 2017 Share Posted January 31, 2017 Don he is basically wanting to convert his 89 to h.o I will not be needing the engine harness and will be using aftermarket gauges in the ls swap. I am not as diverse in the renix jeeps so I just wanted to make sure he has what he needs, I'm sure he can pull minor generic stuff at JY from xj just wanted to make sure their is nothing specific I'm missing That's what I mean. To convert the Renix fairly easily he'll also need the dash and cross body harness from an HO, along with the complete HO engine harness with the PDC. He will also need the '91 fuel level sender from the tank, and he'll have to deal with the reversed polarity of the fuel gauge. I think I mentioned that. Now just to confirm, these all need to be HO comanche specific? Link to comment Share on other sites More sharing options...
cruiser54 Posted February 2, 2017 Share Posted February 2, 2017 I am also about to do this swap also and since this thread is already started I thought I would just jump in and ask my questions and make sure I got what I need to do this. I have a 87 Ba10 4.0 4x4 and I have a 91 Ax15 4.0 4x4. The question I have on the flywheel do I need to 87 or the 91? I am also swapping in the motor and doing the curiser54 tips on the Renix to HO swap. I also just plan to pull out the drive train as one unit and not plan on separating them. Since the motor is out I will also be swapping the motor mounts. Anything else I should know? You're using the 91 transfer case also? Link to comment Share on other sites More sharing options...
kook911 Posted February 3, 2017 Share Posted February 3, 2017 I am also about to do this swap also and since this thread is already started I thought I would just jump in and ask my questions and make sure I got what I need to do this. I have a 87 Ba10 4.0 4x4 and I have a 91 Ax15 4.0 4x4. The question I have on the flywheel do I need to 87 or the 91? I am also swapping in the motor and doing the curiser54 tips on the Renix to HO swap. I also just plan to pull out the drive train as one unit and not plan on separating them. Since the motor is out I will also be swapping the motor mounts. Anything else I should know? You're using the 91 transfer case also? Yes I am. Going to pull everything as one piece then break it down once it it out. Will I be okay using the 91 case? Link to comment Share on other sites More sharing options...
cruiser54 Posted February 3, 2017 Share Posted February 3, 2017 I am also about to do this swap also and since this thread is already started I thought I would just jump in and ask my questions and make sure I got what I need to do this. I have a 87 Ba10 4.0 4x4 and I have a 91 Ax15 4.0 4x4. The question I have on the flywheel do I need to 87 or the 91? I am also swapping in the motor and doing the curiser54 tips on the Renix to HO swap. I also just plan to pull out the drive train as one unit and not plan on separating them. Since the motor is out I will also be swapping the motor mounts. Anything else I should know?You're using the 91 transfer case also? Yes I am. Going to pull everything as one piece then break it down once it it out. Will I be okay using the 91 case? Yes. Link to comment Share on other sites More sharing options...
JeepComanche89 Posted March 14, 2017 Share Posted March 14, 2017 So would a 91 comanche with a 4 cylinder have the same interior cross body harness as a 91 with a high output number? Link to comment Share on other sites More sharing options...
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