So i just got a zex 75 shot dry kit. i have the basic accesories like bottle, solenoids, purge kit, purge button, and activation switch. what else do i need and what are the prices gonna be for them? i have a automatic if that helps.
thanks

 

One step colder copper plugs, walbro 255 hp pump. And either a vb mod or dr mod.
Plulgs are about $15, pump about $110, and vb mod around 350-400 or a dr which is about $5.

 

whats the difference between the Dr mod and the VB mod and why is the cost so large compared to eachother. anything else? like other switches? or anything? sorry ima n0ob to N2o.

 

A vb mod is a full out modification to your transmission and is constantly working. While a dr mod is only used when you go wot (full throttle).

 

If you use the 55 jet, you will not need to upgrade your fuel pump.

If you have a DRY n2o kit DO NOT get a 255 HP(high pressure) walbro... here are a couple reasons:
-If you have a dry kit your fuel pressure to go up to about 110psi while spraying.
-You will need to get an adjustable fuel pressure regulator
-also will need a fuel pressure gauge (unless you have a shop set it all up for you)


If you want to run the 75 shot jet, I would suggest getting a higher-flowing pump that gives the same fuel pressure as stock. I'm only familiar with the walbro 255 hp pump (and I used to have a ZEX dry kit... [cough-cough]) but I think walbro makes a 190lpr stock pressure pump and you should not need to worry about those things I listed if you get that one (please research this before you buy).

For plugs, I use NGK BKR7E coppers. I get the copper ones because I like the $1.68 price tag. These are 2 steps colder than stock and, IMO, are a MUST if you are running a 75 on an auto. If you would rather have the 1 step colder plugs, get the BKR6E's.

good luck.

 

If it were me, I'd start with a 60 shot and see how things go from there. Once you get to the 75shot range, then upgrading the FP is necessary with a dry shot.

 

I think a bottle heater is a must have item. A remote bottle opener is a convenient item to have.

 

I have the walbro 255 running 100-125 shot dry NOS kit. True, you need an adjustable FPR since n/a fuel pressure will be way to high without one. On the other hand, I think a fuel pressure gauge should be used with any dry kit regardless of shot for tuning/monitoring purposes.

However, are you sure the regular 190 pump can sustain higher fuel pressures needed for higher shots (i.e. ~85 psi for 100 shot)? Perhaps the 190 high pressure version wouldl be a better option...Although, I have no experience or idea what effect these two variations of the 190 pump will have on n/a fuel pressure w/o an adj FPR.

 

I see what you are saying... I just wanted to stress that the new pump needs to run at stock pressure to avoid bursting fuel system components. Does your 255 run at stock pressure with the original fpr?

I posted a thread in here about 18 months ago which I talked about my woes of upgrading the fuel system and running a dry 55 shot. (I was upgrading in preparation for a V2 SC kit) http://forums.maxima.org/showthread.php?t=300832

 

With the 255 but w/o an adj FPR, I got 40 something PSI during idle and 50 something PSI during n/a WOT. I installed a FPR soon afterwards, and had to lower idle to ~30psi in order to see 43psi (stock pressure) during n/a WOT, which is the set up I run now.

It's the first day after a long weekend, so I didn't feel like completely reading your referenced thread, but it seems to me that fuel regulating system for the ZEX dry kit and the NOS dry kit are a bit different. For my NOS dry kit, nitrous flows from the bottle -> first solenoid -> nitrous pressure regulator -> second solenoid. A vacuum line comes out of the nitrous pressure regulator...no nitrous ever sees the inside of this vacuum line.

Anyway, I've never had any probs with fuel delivery with my NOS dry kit, Walbro 255, and adj. FPR.

 

I currently run a 75 shot on stock fuel system and have not had any problems witt it at all I am running the NOS dry kit myself. I use to run the 300zx NGK plugs then got succkered into the Denso Iridium plugs and come to find out it didnt matter. And if you can get the VB mod it is like night and day. Good luck.

 

Whether you need an upgraded fuel pump for lower shots definitely depends on the condition of your stock pump. When I first sprayed, my stock fuel pump (~80k miles) couldn't even sustain the required pressure for a 50 shot. My fuel pressure gauge told me so. That's why I think a fuel pressure gauge should be used even for small shots. You never know when your fuel pump will crap out on you.

 

Gotta have a gauge even if its only a mechanical under the hood. Of course its probably too late to shut down if pressure drops even if you are looking at it but it will still give you a good indication by the pressure and if its fluctuatiing or not.

 

Ive had a Walborro go bad before, so +1 on getting a gauge, you need to be able to monitor your fuel pressure somehow.

 

Hey good to see you back.

 

I shot an 80 shot and it seemed like it wasnt as powerful as it should be. The bottle pressure was only 700 psi but do u think it could be the fuel pump being to small? I didnt even break the tires loose, but i also have an Auto, soon to be a 5-speed.

 

Thanks man

 

2 things there. #1, if your running an 80 shot, you should deffinetly have an upgraded fuel pump IMO, and #2, 700psi is way too low, and it will make a HUGE difference. You need a bottle heater. If your not going to do it right, why bother?

 

Yea the 700 psi is baiscally like an empty tank. I dont use a bottle heater and at full bottle I have 900 or so psi and I shot a 75 shot and spin all the way till 2nd and im auto so I would look into some stuff if I were you