Well, I finally finished the Nitrous project on my 2002 SE Maxima. I started with a 70 shot (#42 jet) and spent some time adjusting the fuel regulator then went up to a 100 shot (#47 jet) . So far it looks like I still have a lot of tuning time to do. I got the Stochiometric gauge showing on the rich side where the car normally would be under full throttle but it really needs to be a little richer than normal. In order to install the EFI dri NOS kit on this car I had to add a booster pump and external fuel regulator. At the moment I have the Aeromotive regulator turned up as high as it will go and the SX fuel pump is putting out about 110+ psi of fuel pressure. After I get some more tuning done I'll probably have it running up over 120psi. The autometer electric fuel pressure gauge I have only goes to 100 but the needle can continue to run past that 100 mark.

With the 70 shot the car doesn't really feel much faster to me and the engine doesn't sound like it's doing any more work really. The 100 shot seems to be a lot better but still it's not as fast as I want it to be. The VQ35 is still begging for more juice and I plan to give it more. Hopefully I can squeeze enough fuel into the thing to get it to a 150 shot but if not I'll have to go to a 6 port fogger setup. Those produce a lot more bottom end torque than a dry kit and more evenly distribute the contents.


As soon as I can get hold of a digital camera I will post pictures of the project for all to see. I can tell you it was a rather expensive project to do on this car because I had to buy the fuel pump, the fittings, braided hose, Stochimetric gauge, fuel pressure gauge, gauge pod (for a '99 Maxima, had to use a heat gun to mold) and the fuel regulator. I already had the nitrous kit but if I add up the cost of everything it comes up to about $1250.
It will probably be a couple of weeks or so before I get back to the dyno to see the numbers but I will post them as soon as I can.

 

150hp shot! ur crazy man, but thats not really a bas thing just be careful remember what No2 can do.

 

Yeah yeah yeah, like I have never heard that before. Anyways, like I have always said, I am working on a Nissan NOT a Honda. You hear stories about people blowing up their engines it's usually because they screwed something up. I am well aware of the potential of Nissan engines. If I didn't 100% believe the VQ35 could safely hold a 150 shot I wouldn't even think about doing it. This motor will hold that much power, IF done right, and I intend to prove it.

 

You are the MAN!

I believe you're the first to sucessfully acomplish this on a 2k2 max. Did you run into any snags? I remember someone on freshalloy.com commenting about difficulty finding the fuel return line on the 2k2 max. BTW are you the same SR20DEN on freshalloy and nissanx? Just wondering. Congrats on a successful install and happy rocketing Is there a write up in the future?

 

Yeah that is me. I posted this in FA as well. The fuel system dilemma was why it took me so long to finish the job. I took my sweet time on this one cause I don't want to blow it up. I am getting meticulous in my old age. When I was young and dumb I used to throw crap together on my SE-R, blow it up the same night and have the engine all over the garage by the next day.

 

I'll belive it when i see it
But i can't wait to see the dyno you will get out of that

 

Awesome Matt! I can't wait to hear the dyno results. Now it's time for the next project, you know what I'm talken about

 

that's what i'm gonna do in several month once i get a spare manifold and have in all chromed up. with a return less fuel system that seems the easiest way to go, i don't want to have to get external regulators and pumps. stock 51psi of pressure should support a 125 shot of nos easily and we'll go from there.

 

From what I've seen thus far, I would highly recommend you get a booster pump anyways. Probably a Vortech T-Rex. The stock fuel pump may not be good enough to support an extra 125 even at it's normal 52 psi. Thats just my .02

Oh are you going to use fogger nozzles or somethign else. I'll probbaly mill an aluminum plate to go between the upper and lower with spray bars if I go to the fogger. I have had the upper intake off of the engine and it looks like it would be a pain in the butt to use the nozzels.

 

umm so we don't have a return line? how does that work?

 

I guess this is the setup Im going to be looking at. Im only loking for a 75-100 shot. That should tame my cravings for the time being. I still think the stock pump might need to be upgraded, just to be on the safe side..

 

What kind of o2 sensor are you using to read the A/F ratio? Would it not be prudent to run higher octane gas while on the 100shot? At those fuel pressures what happens if an injector fails or goes static? What spark plugs are you going to run while on the spray, I figure at least one heat range colder than stock.
Anyway that is a nice setup, should give you good results on the dyno and at the track.

 

I just plugged the meter into the factory O2 sensor on the left (back) side of the engine, the on in front of the pre cat.

I never have had to run higher than 93 octane on any nitrous equiped vehicle, including my old SE-R that was running a 160+ shot four port fogger.

I will just use the stock plugs and stock heat. As soon as the Bosch Platium #2's are available for the VQ35 I'll use them. Platinum plugs don't last as long on the bottle compared to normal plugs but Nissan engines run like crap without them.

Keep in mind the base timing on this car is 15 degrees. It could really be run at 19 or 20 on the motor and make a bit more power and torque. Since there is 4 or 5 degrees left in the engine to play with you don't really need to retard the timing because you could consider it already being retarded by 5 degrees.

If the local dyno shop will be open Monday i'll try to go in and run. Im eager to throw down some numbers and get some tuning time in.

 

get to the track lets see what it will do with n2o

 

Please don't use Bosche plugs. Stick with Nissan plugs since they are made by NGK. If you prefer copper plugs, Nissan does carry NGK coppers.

It's also highly recommended that you run at least one step colder regapped plugs.

Good job!

 

I have almost 10 years of experience using Bosch Platium plugs in various Nissans. Thats what I like and thats what Im gonna stick with. I personally think they run better than the NGK.

 

ok just a question, ive heard or this many times, but im not too familiar with it, when u refer to colder plugs, i know it smaller gap size, but how much of a smaller gap size. how much of a gap decrease is each step colder. thnx in advance.

 

http://www.centuryperformance.com/spark.htm

 

good enough.

 

i plan on using a DPI kit with 6 foggers one in each runner. i'm gonna tap teh runners of a spare intake i want to buy.

 

I'll probably have to change over to a fogger setup as well. I just fattend up the fuel to supply the 100 shot and it loks like there isn't much left to play with even at 110 or 120 psi. (can't really tell the gauge won't read that high)

The major problem with using a fogger is that you need some type of RPM activated switch that will turn off the Nitrous flow before the ECU hits the rev limiter. The ECU rev limiter is only a fuel cut device but the ignition spark will continue to run. Dumping fuel into the intake will over run the factory rev limiter and allow you to spin your engine to it's breaking point. I did this very same thing on my '92 SE-R when I missed a shift at the track. It buried the 9 grand tach within a fraction of a second and tossed a rod out the side of the block. Im not sure what device we could use that will read a 12 volt supply off one cylinder ( as a tach wire) and disconnect a relay at a specified RPM. If anyone knows of any such hardware please let me know.

 

A modified MSD window switch won't work?

 

My 100 shot is coming in about 1 1/2 month... That should be an interesting dyno...can't wait! And those who know what Im up to know it will be done!

 

You already put down 298 and now you want to add a 100shot? What is this a race to see who will be the first to put 400hp at the wheels of a Maxima? Do I need to pull out the stops? hehe

jhans; what gauge pod did you use? I used one for a '99 Max and I had to mold it way too much. Your's looks much cleaner than mine.

 

that's a good point i'm sure we could just use a harlan window switch that turns off at like 6500rpms that's setup to cut the entire nitrous loop. http://harlan.sketchy.net/store/store.html

 

I actually used the same one, a little cutting and a heat gun and presto, but i want to paint it the same color as the pillar. And for the first comment, can never have too much power!!!

 

I landed my first kill tonight with the Nitrous and I almost went to jail as well. My neighbor and I were crusing around trying to find people to race and I wasn't having any luck. So I decide to go ahead and race him just to see how well I could keep up. He has a '93 Mustang GT with a full top end and a 11 pound Vortech blower, probably putting about 450 to the wheels. We do a 2nd gear rolling start and kick em off. He lets me get the jump knowing he'll run me down but he's making so much power he couldn't get enough traction to reel me in. I retained my 1/2 car lead on him because of this. The Maxima hooked very well and took off without fail and near the top of 3rd gear I decide to shut it down. We pull up to the light and I ask him why he didn't smoke me. About this time I look in my rear view and see what looks like a police car making a B line right for us. He pulls up beside me and tells us both to pull over and we do. Fortunately for the both of us we told the cop the truth that we were being stupid and knew each other. It was only because of our honesty that he didn't take us to jail. So now we both have to pay a $200 fine but get no points on our licenses. I guess that's a small price to pay to avoid being bubba's little girl.

And if that isn't stupid enough of me, another opportunity knocks. I was on the interstate doing 65, trying to stay low key because of what happend and some other red Mustang come flying up behind me and passes me on the right. He gets about a half mile up in front of me, slows down then I hear him kick it again. By this time I figure what the hell, im close enough to home I'll go ahead and show this dude up. I casually (arm the NOS) speed up enough to pull up beside him, drop to 3rd gear and start antagonizing him. I hear him downshift and we're off. I must have gotten the jump on him too cause he immediately drops back. I notice the car isn't pulling like it should do I look down to make sure the Nitrous is armed and at the same time the thing surged and I start running away from the guy. No sooner than I get some distance on him my radar detector starts blipping. I decide to hit the brakes and exit quickly. The Mustang keeps hauling *** hopefully attracting attention to himself. I pull off in a gas station, wait a min then go home. I probably could have finished him off but I wasn't in the mood to find out if that was a false alarm or the real thing.

Anyway, so there are some of my kills. I just think it's crap luck that when I finally get someone to race me I get caught. I usually can't pay someone to race because I don't attract attention to myself and keep my car quiet.

 

nice kill dood! man i wish i had the ***** to do the NOS thing...I'm to worried about the warranty on my motor...man i would abuse it like there is no tomorrow!

 

thats what im sayin, if it was up to me 150shot inst even enough, im crazy when it comes to power adders and sometimes in a bad way, who knows give it a month or two and ill set up a 250+shot (very doubtful, but if i had the extra cash i would)

 

OK I finally got the pictures of the system. Here are some older pictures I had and pictures I took over the weekend. The new pictures are full size and not exactly 56k friendly.

I will be going to the dyno this weekend and will post numbers when I get back.

 

Looks like you had fun pulling apart your car.

 

how did you get pass the drive by wire.. since the NOS kit uses a throttle cable?

 

I never put the switch under the hood like most people. I always put the switch somewhere off the gas pedal so it doesn't die from too much heat.

 

thats a nifty idea... NOS was coming out with a drive by wire attachment.. but i guess many people probably took the route you took and they change their minds.. or maybe they are still coming out with it..

 

since you live so close to me about 15 mins away i would like to see what a difference nos makes i have never been in a car with nitrous

 

Your running 110 - 120 lbs of fuel pressure. How much can the injectors handle?

 

prolly like 121psi

 

HAHAHA yeah they're probably on th edge of insanity. As for what they can handle I have no freaking idea. At that kind of pressure they probably doing more squirting than spraying. I did notice that my lower intake runners had extra buildup of gas in them. I'll just have to hose them down with B12 Chemtool every few thousand miles to keep em sparkly clean.

 

Just out of curiousity, what are using to "tune"....tuning requires manipulation of timing, fuel (other than the regulators), etc. I assume the "timing window" is the play? looks like a great project!

 

I bet he didn't pull his engine