NITROUS questions and thoughts. ZEX and HEMI applications.

[onehothemi]

Ok. Some issue's, thoughts, and questions that I've run into with the Zex nitrous kit 82176 so far. My upgrades are far and many so I'll be brief. CAI, headers, full exhaust system, 75 shot zex nitrous hemi kit, factory fuel rails and injectors and pump.

No check engine lights... thank god and so far no blown engine. lol

1.) Engine / Fuel Issue. The computer has to "learn" the new air, fuel, and nitrous mixture that goes into the intake manifold and engine when spraying. This increase in fuel pressure and levels in the engine at times creates excessive vibration and then levels out back to normal. The primary issue is that once the computer learns the new mixtures it expects to have it all the time. For example start the truck and let her warm up, go for a dry run, and two or three runs with nitrous. Then go to lunch, as I'm sitting in the parking lot the truck's idle fluctuates up and then down once or twice and then the truck stalls out. I can fix this problem by giving a little bit of gas when it drops off but I don't want to have to do that. Now could this be a fuel filter and or fuel pump pressure issue? It doesn’t do it all the time, only after two or three really hard runs. If there is any way to combat this fuel issue as I can't think of what else it could be, either by upgrading the pump or using a new fuel and or air filter, are there any suggestions?

2.) Bottle issue. I have a pressure gauge at the bottle from Zex, and one in the A Pillar pod now, that's all swell as long as the bottle is open and ready, but my biggest problem is I don't know when the bottle is empty. I don't want to do a run and have the improper fuel or nitrous mixture and possibly blow or damage my engine, even though the Zex kit prevents misfiring like this I like to cover all the bases just in case the system fails to cut off or cuts off too late. Other than trying to count the runs and purges I do, I wanted to know if there is any way of knowing inside the vehicle when a nitrous bottle is empty other than un hooking it, taking the straps off and weighing the bottle by hand.

3.) Launch / Usage issue. When using the nitrous, when is the most effective time and or safest way to use the kit and nitrous, rather when is the best time to enable the system to spray on open throttle. Example, after first gear or shift, or before.

4.) Computer / Programming Issue. It is my understanding that the Jeeps with the HEMI engines and other similar equipped vehicles do not have full open throttle till around or after second gear. If this is so then the full open throttle nitrous setup only hits after second gear or a hard whomp on the throttle. So there are either three ways to combat this, please let me know what you think.

Either change the system to manually firing of nitrous, or when programming the throttle body's position to the Zex's computer or programmer only open the throttle body 3/4 of the way so the Zex computer think that that is full throttle. This way the system will inject nitrous at 3/4 to full throttle instead of just full throttle.

5.) Reflashing / Chip / Programming Issue. Can you run the JET stage 2 chip with the nitrous system safely? If so great, if not, any suggestions for upgrading the stock computer / ECM / ECU. Some one recommended having the computer flashed with the police package HEMI software rather than sending the computer to someone.

6.) Engine Oil / Filter issue. The 5.7 Hemi's are required running 5W-20 oils, daily, but for a nitrous set up is it possible to run thicker oil for the summer to reduce friction and wear as much as possible? I am currently using Amsoil high grade synthetics but I want to go to Mobil 1 but with a thicker viscosity. Any ideas or suggestions.

Thanks so much for your time and help with these issues. I figured I'd get them out there and see who knows what and share and exchange information. Any and all help will be greatly appreciated.

[Big Boy]

Zex nitrous kit 82176???

[mhigham]

Some thoughts below.....

Ok. Some issue's, thoughts, and questions that I've run into with the Zex nitrous kit 82176 so far. My upgrades are far and many so I'll be brief. CAI, headers, full exhaust system, 75 shot zex nitrous hemi kit, factory fuel rails and injectors and pump.

No check engine lights... thank god and so far no blown engine. lol

1.) Engine / Fuel Issue. The computer has to "learn" the new air, fuel, and nitrous mixture that goes into the intake manifold and engine when spraying. This increase in fuel pressure and levels in the engine at times creates excessive vibration and then levels out back to normal. The primary issue is that once the computer learns the new mixtures it expects to have it all the time. For example start the truck and let her warm up, go for a dry run, and two or three runs with nitrous. Then go to lunch, as I'm sitting in the parking lot the truck's idle fluctuates up and then down once or twice and then the truck stalls out. I can fix this problem by giving a little bit of gas when it drops off but I don't want to have to do that. Now could this be a fuel filter and or fuel pump pressure issue? It doesn’t do it all the time, only after two or three really hard runs. If there is any way to combat this fuel issue as I can't think of what else it could be, either by upgrading the pump or using a new fuel and or air filter, are there any suggestions? Have you checked your plugs? You can learn a lot from those. Cooler plugs are a must.

2.) Bottle issue. I have a pressure gauge at the bottle from Zex, and one in the A Pillar pod now, that's all swell as long as the bottle is open and ready, but my biggest problem is I don't know when the bottle is empty. I don't want to do a run and have the improper fuel or nitrous mixture and possibly blow or damage my engine, even though the Zex kit prevents misfiring like this I like to cover all the bases just in case the system fails to cut off or cuts off too late. Other than trying to count the runs and purges I do, I wanted to know if there is any way of knowing inside the vehicle when a nitrous bottle is empty other than un hooking it, taking the straps off and weighing the bottle by hand. Not sure on that one, but if you run out you will know with no damage. You will most likely bog.

3.) Launch / Usage issue. When using the nitrous, when is the most effective time and or safest way to use the kit and nitrous, rather when is the best time to enable the system to spray on open throttle. Example, after first gear or shift, or before. As soon as you can get traction and over 2500 RPM. If this is the Jeep, you should have plenty of traction. Just don't spray during shifts.......

4.) Computer / Programming Issue. It is my understanding that the Jeeps with the HEMI engines and other similar equipped vehicles do not have full open throttle till around or after second gear. If this is so then the full open throttle nitrous setup only hits after second gear or a hard whomp on the throttle. So there are either three ways to combat this, please let me know what you think. They go WOT, just may have TM going on. I use the TPS sensor, that way of for ANY reason the throttle gets pulled, nitrous turns off. It you use the pedal sensor or micro switch, you lose that safety if the TC kicks in or the throttle motor fails..

Either change the system to manually firing of nitrous, or when programming the throttle body's position to the Zex's computer or programmer only open the throttle body 3/4 of the way so the Zex computer think that that is full throttle. This way the system will inject nitrous at 3/4 to full throttle instead of just full throttle.

5.) Reflashing / Chip / Programming Issue. Can you run the JET stage 2 chip with the nitrous system safely? If so great, if not, any suggestions for upgrading the stock computer / ECM / ECU. Some one recommended having the computer flashed with the police package HEMI software rather than sending the computer to someone. I use the SC 87 tune for nitrous and may step up to the 91 tune with 100 shot. Others have used the 91 tune since it is so conservative. B&G has a N2O tune I believe.

6.) Engine Oil / Filter issue. The 5.7 Hemi's are required running 5W-20 oils, daily, but for a nitrous set up is it possible to run thicker oil for the summer to reduce friction and wear as much as possible? I am currently using Amsoil high grade synthetics but I want to go to Mobil 1 but with a thicker viscosity. Any ideas or suggestions. I would stick with the 5W20 since it has been proven to make friends with the MDS. If you must, most synthetics are available in 5W20.

Thanks so much for your time and help with these issues. I figured I'd get them out there and see who knows what and share and exchange information. Any and all help will be greatly appreciated.

[FlyByU]

Lots of big questions.

Ill try to help with a couple of em. You will know when your bottle is getting low when you can no longer maintain a good pressure. It wont just get empty, it slowly looses PSI. When you cant keep it above 800 PSI or so (just a ballpark number) go get it filled up

Alot of us are running nitrous with aftermarket programming like you ask about with the jet chip. To me, the jet chip doesnt really do enough to warrant running it with nitrous. In my case, the B&G helps enough when I run motor only that its worth the effort to use it in conjunction with nitrous. To better answer your question, lol, you "should" be fine with the jet chip.

[formerice]

I run a 100 hp NX kit on my 5.7 Hemi QC 4X4 Ram. I run NGK LZTR5A-13 plugs gapped to .35 . I have a manual switch/ button that I hit at 3000 rpm in 1st gear and don't let off until I cross the finish line. Make sure the nitrous injects as far after the IAT sensor as possible. Low bottle pressure wont hurt anything , just cause a bog from overfueling. I don't think you need to reflash the computer, but some 100 octane blended in for the track would be safer. I never trust anything but my index finger to hit the juice, use the same oil as you normaly use. As you go below 3,000 rpms to initiate the juice you are taking a big chance, bigger with the 5.7's plastic intake, hyperutetic pistons, etc. If you have the 6.1 , well, your gonna have some fun!