Zex Nitrous Question
 

Hey Everyone,

I have just finished installing my Zex kit on my 05 MT. Loved the kit and how simple it was to install and set up. Thanks to CRHill for all the informative threads. The problem is, now when i use it, it starts running pig rich. i have a autometer wideband o2 guage, and before i started using nitrous i could tell there is 2 or 3 different steps through the rpm range that the mixture riches progressivly, but never under 12ish. now when i hit the throttle with nitrous, and the recommended jets for the 55 shot, it drops below what the guage can read, and no difference. i then tried using the 65 hp nitrous jet, with the 55hp fuel jet and it helped, but its still running rich. i dont know what to do. could it be my bottle pressure, when i got it filled it only had 850 psi in it.

I thought the autometer widebands read as low as 6:1 or even lower? If you're running that rich- your engine is stalled and flooded

I know my AEM gauge does not go below 10:1.

http://www.autometer.com/cat_gaugede...id=3603&sid=15

Thats the link to my A/F guage. it reads 10:1 to 20:1. I dont have pictures of my install where i am right now, itll take me a couple of weeks to get them. I have mounted the NMU under the airbox, and the nozzle in the intake where CRHill reccomended, in the third fold back on the flex hose. Im not sure what part of my install would affect this. the only thing i can think of is because my fuel line runs up above the nozzle, but that wouldnt affect the AFR under pressure, only after the solenoid closes. the rx8 runs sequentally richer the higher the revs go, at least mine does. at about 4K rpm, it drops form almost perfect 14.7 to about 13.5-14. and at about 6K rpm, it drops from there to about 12.5-13. now when nitrous is active, its about perfect all the way to around 6K rpm, and then drops to 10.5-11. i dont understand this

i just dont undersatnd, it runs so well, and pulls so hard until it hits 6K, then it feels like stock again. and if theres no change in the higher rpms, i dont see the point of using it. maybe its psycological, not sure. im gonna pick up a 65lb bottle and fill myself when i get home in a couple of weeks, then ill see what happens when im not getting screwed by the guy whose filling it

i mean a 65 lb tank to keep at home and use to fill my 10 lb bottle myself. everything in my car was working fine. i have not had so much as a hiccup since i bout it, except for blowing both high-beams the day after i bout it. im not putting 65 lbs in the car.

If you are going to fill at home (which I DONT think is a good idea unless you have exp.), think about a hasco pump and make SURE all of your fittings are rated for 100% 02!!!

Yeah good point, the classic catch 22.

If people are going to do it anyway, can you make it safer for them, OR will your input encourage people to do dangerous things.... I am not sure where I stand on this one, but non O2 fittings and O rings are bad news! I have seen the effect of O2 at 2800 PSI igniting on a bur on a thread.

Yeah, I am the same way. Well, if YOU need any info for your shop on the subject...I know a small bit about mixed gas and pressure. TEE HE HE...

For others, don't try this at home! Unless you are a commercial cutting/welding guy or proffesional diver. In which case, you prolly don't need my help anyway.

Do I get a cool bowling shirt? I'll do almost anything if I get a cool bowling shirt...

i have checked, double checked, and triple checked the jets. thats what i thought at first too. but ive got them in right. its just that i have to use the 65 hp nitrous jet with the 55 hp fuel jet. and what are you guys referring to when youre talking about mixing gasses?

It is a cheaper way to keep your bottle full, but it can be pretty explosive if you do it wrong. So after CH talked me down, I thought better of publishing the info. Sorry.

Is there any extra tuning you are doing? Fuel Pressure increase, extra injector, or an EMS for this kit? If so can you get a logfile? If you can, I can massage it and give it to Charles and see if he can help.

no, its a bone stock engine. the only mods ive made is a short throw shifter and a few cosmetic mods. shouldnt the factory FMS counteract an extra lean condition?

is there any possibility it could be the flash version that i have? im not sure which one i have, but it might not have been updated for a while

With any signifigant increase in Partial Pressure of O2, and or Forced Induction, the facotry EMS settings can and will freak out and fail to provide adequate fueling. In the case of the Zex kit, I do not know what the mechanical/electrical system does to increase the fuel to the engine since I haven't installed NO2 into my engine, but without something in place to provide extra fuel you will run lean. The PCM may be cutting power due to knock sensor or cat protection mode. I don't really know, I am a turbo guy. If you have an ability to get engine logs I can better tell you, without them Charles is going to be your man, sorry.

thanks for the help.

i have ragged and bagged the balls off my car since the day i bought it. the way i see it, if im gonna have a car like this, i might as well drive it properly. ive drifted long into the rev limiter, had horrible mis-shifts after bouncing off the limiter, redlined in every gear except sixth, and the only time i ever tripped a CEL is after i tried putting the car sideways in second gear on wet roads and turned the engine backwards. the damn thing whipped around faster than i ever possibly imagined, and i couldnt get the clutch down fast enough. i will read through youre posts again tomorrow. i have a few things to check out when i get home in a couple of weeks before any alteration is to be made to youre posts. ive only ran 1 bottle so far, and i dont think it was entirely full. i will experiment a bit bore and write back in a while. thanks for the replys guys

you dont mention year or mileage. but if older year and higher mileage. sounds a bit like the apv is not opening all the way...

does it pull hard from 6k without the bottle?

also coils, plugs, wires tight. and then the cat.


beers :beer:

it pulls hard all the way through. it just enriches a little bit above 6K without the bottle. theres no discernable loss of power though. it is an 05 MT with 42500 km on it right now. maybe a noob question, but APV?

not yet. i wasnt planning on putting a hi-flow cat or catless midpipe on my car. I want to put the borla cat-back exhaust on and i dont want it to sound like a 16 year olds civic with a resonator. Ive read that thats what it sounds like when you take it off. As for the RB reflash, i would have sent it away already if i didnt have to wait a couple of weeks to get it back. I live in canada. plus i cant be without my car for that long. im thinking about a haltec Interceptor ECU. just doing a bit of research on their units right now

thanks for the help, and ill be back in a couple weeks

hey, where did all Charles's replys go?

Here is the pics of my install. i just got my bottle filled for the 2nd time, this time it had 1000psi and my A/F is even worse. it was down below 10 in the high rpm range. i think its interfering with the MAF. Any help?

http://img263.imageshack.us/img263/157/dscn0525ri8.jpg

http://server6.theimagehosting.com/i...CN0509.0af.JPG