Hi, I have a 97 civic ex with AEM CAI, STR throttle body, skunk 2 intake manifold, dc headers, apex cat back exhaust, msd ignition wires, coil, and controller, pulley upgrade, denso iridium plugs, accel fuel injectors, AEM fuel rail, regulator, and filter, with new high flow fuel pump. I was wondering if it would be safe to put a NX sigle nozzle EFI system set to a 75 shot. I would then retard the ignition 4 degrees to prevend detonation. NX says that this system is safe to use on a stock motor so I figure that it will be more than safe with the ignition retard and added fuel. All my internals are stock and NX says that it safe with stock internals. It will be used maybe 5 times a year and only for about 4-5 seconds each time. I am a good racer and have never hit the rev limiter before. I was wondering if anyone knew anything more about this setup or if anyone has some recommendations.

thanks

If you are going to run it that little itll be perfectly safe and it wont wear your engine only minimal...

ive heard a shit load of times from a shit load of people that nx express, venom and zex are the best nitrous systems.
and ya it will be safe if used rarely or like 5 times a month

ok first of all ditch the plugs and get ngk bkr7e plugs. in all of my years of doing this i have only seen one honda hold a 75 shot for any period of time. i have seen many people come and go with "all of the right stuff" and they still burn valves and rings. the key is tuning, the most important thing to keeping it together is having some type of fuel computer and and "ACURATE" a/f set up. we offer wideband tuning, i would recomend it and tuning by an EXPERIENCED tuner. unless there is some prexisting problem with the engine you should be a-ok if it is properly tuned. is the AEM FPR the only fuel tuning item that you have? if so you should go with an afc bare minimum. also, have you chipped you ecu? if so it will probably be running too much timing on the top end for nos. let me know.

KLR you know your shiz, but I think the zex plugs works lots better. plus the timing will be fine @-1 degree since you barely use it, and so you don't lose all around, dayly driving performance.....

is the AEM FPR the only fuel tuning item that you have? if so you should go with an afc bare minimum

yes it is the only fuel tuning item. What did u mean by afc bace minimum. I dont have an ECU chip for the sole reason that it will advance the ignition. What tuning do you recommend I do. Also, I have seen cars with 55 shots on a stock car that ran fine over and over again. Is the difference between 55 and 75 that big?

the difference 37.5% more stress on your motor... you tell me would you take the chance, nitrous will run purfect over and over again, and then be off the 20th time ya use it, with most of the right equipment it should be fine, but ya neva know. I would go with a ZEX wet kit and use a 65hp shot w/ nitrious express bottlewarmer, Upgrade ya fuel pump, and a beffyer clutch..... maybe even a Zex flywheel...

the difference 37.5% more stress on your motor... you tell me would you take the chance, nitrous will run purfect over and over again, and then be off the 20th time ya use it, with most of the right equipment it should be fine, but ya neva know. I would go with a ZEX wet kit and use a 65hp shot w/ nitrious express bottlewarmer, Upgrade ya fuel pump, and a beffyer clutch..... maybe even a Zex flywheel...
why nitrous express botlle warmer? why not zex bottle warmer??????

better question, how does he have "headers"?

I already have an ACT clutch and Flywheel I just didnt list it. I also already have a better fuel pump. Also HondaIntegraXSI what is the difference between ZEX and NX. Is there anything that makes it better?

Not a good ideal. But if you really what to do it then retard time 2 deg. and get the ngk bkr7e plugs. That will help a little bit. But like I said 75 shot is to much for your motor. Trust me I ran 55 shot on my car and I know I ran mid to high 15s. Cuz I beat a 15.8 car and lost to a 15.3 car by just a little and thats cuz I got bad start. Run 65 shot and you will be fine and with your mods plus 65 shot you will run 14s if you dont already

The ZEX kit is much easier to install/hide. There is no solenoids/switches, just a box with a wire connected to the TPS sensor. I feel the Zex kits are some of the safest kits.

the Zex kit is about 3 hour instal compared to 5-10hr NX installI recomend the NX bottle heater because its more reliable, easier install, and it heats more thourly (dunno how to spell it).. preasure is everything on a nitrous kit, and when the preasure is right; whit a 55 shot it will make about 65-70hp... keep in mind this this is only when the bottle is heated more properly...

may I ayso recomend a toda racing timing belt.. for sudden burst and 250% as strong as stock, ya can't go wrong...

Ok SOHCD16y8 here is what you need to do. First get rid of the ECU chip! Then put the word ZEX out of the choices, and that goes for the plugs too. I have seen too many people blow rings and worse with ZEX, and i have not seen one car that has used it last for more than a year. I on the other hand have been using my NOS kit for almost 3 yrs and the motor still runs strong and compression is fine every time I check it, you do the math. Now ZEX has come out with a wet kit , it would be alright but a big problem with ZEX is that if a solenoid dies then you have to get a new box or go thru hassle getting a new solenoid, but with NX ans NOS you just go anywhere and they can get you a new one quick. Just my opinion on ZEX. Now you also need to do some tunning, and yes wideband tunning would be the best, but not a must to be reliable. And whoever said that a 55 shot would give 65-70 hp has no clue what they are talking about or are using their nitrous wrong and their motor will not last for long! As far as plugs go with the NGK's they work good. One thing you need to do is do a compression check on your motor to help determine what the condition of your rings are in. The main thing you are looking for is variation between cylinders, if there is alot of difference between cylinders then don't even think of putting nitrous on the motor it will only make the problem wosre faster. And 75hp is alot for a D series motor IMO I think I would just stay with a 65 and less. Also with nitrous comes more maintance. Are you ready to do more maintance more often? Using the nitrous will break down your oil faster and also you have to make sure that everything is working properly before you use it because you never know when a solenoid is going to stop working or a relay is going to stop working etc. There is alot more to it than just installingit and using it to be reliable, I think that is why people have given it a bad rap. Any more questions just let us know.

whtteg the NX heater on a ZEX wet kit w/ a 55 shot gave me 64 hp. I have basted 2 B16A w/ nos direct port and low compression pistons, crower rods, and a balanced polished crankshaft w/ a 90hp shot. the NOS and ZEX dry kits are peices of shizit. the NX kit is nice, but complicated, but ZEX whas designed,and built on hondas. then later on Nissian's and so on.... Trust me, I do wideband tuning and I see what it looks like. tuning plays the key role here. a properly built and tuned motor will be fast and reliable w/o Nitrous, but very accepting with it.

whtteg the NX heater on a ZEX wet kit w/ a 55 shot gave me 64 hp. I have basted 2 B16A w/ nos direct port and low compression pistons, crower rods, and a balanced polished crankshaft w/ a 90hp shot. the NOS and ZEX dry kits are peices of shizit. the NX kit is nice, but complicated, but ZEX whas designed,and built on hondas. then later on Nissian's and so on.... Trust me, I do wideband tuning and I see what it looks like. tuning plays the key role here. a properly built and tuned motor will be fast and reliable w/o Nitrous, but very accepting with it.

The only way you could have gotten that much hp from a 55 shot is if you had the wrong jets or the bottle pressure was way too high. Judging by what you said about blowing 2 B16's I would say you probably had the bottle pressure too high, anything over 950-1000 psi is way too high, the jets are rated with 850-900 psi bottle pressure. If you get the pressure higher yes you will get more hp but at the sacrifice of your motor running lean.

I run about 940 psi, Maybe the bottle is a little overheated, but I haven't had n e problems yet..[with the ZEX wet kit,NX bottle heater, ZEX purge valve-(big waste)]

Just so everyone knows I dont have a chip and have never owned one. I already change my oil every 2000 miles and do basic maintenance in about half the required time. After reading all of these opinions and talking to other people I know I am thinking about puttin on a ZEX 65 wet shot with a ZEX bottle heater, pressure gauge, and blow down valve. I would then retard the igntion 2 degrees. I would use ZEX plugs also. I am not planning on using it all the time. Only about 10-20 times a year with the 65 and about 10 times a year with the 55 on. Also, whtteg what NOS system do you have. Let me know what you think about this set-up. Also please dont even waste your time suggesting a dry shot because I would never put one on my car

I was lookin on the ZEX site and they ran a 75 shot on a d16z6 with a stock engine except for a test pipe, headers, ACT clutch, and 14 inch slicks. The car weighed 2465 with driver and ran a 13.5 sec quarter