When to go from dry to wet N2O?
Im nearly complete designing my NO2 Kit. I have a 94 540i and figured that the fuel system on it would be adequate for quite a large boost. I was going to change my fuel pump first since it has 150K miles, but other than that, I figured it was ready to go. Anyone have advice on when its time to step up the fuel flow? If that's necessary, I figured bigger injectors would do the trick. The stock emmisions system is capable of compensating for the N2O by adding alot more fuel right? I was pretty much just planning on going for it with custom solenoid valves, while relying on the stock 02 sensors to manage everything.
A wet kit is the most safe way to run nitrous>>>.>
Your stock fuel pump should be able to support about a 100 shot. Your torque will exceed the Hp boost as well. That is of course if your fuel system is 100%. If there is any question than investigate. Changing your fuel pump is a good idead as it is old. In my 6 I used the ZEX dry kit. I went with a single Holley intank pump, larger injectors, and more fuel pressure. The stock fuel system held about 100hp that is why I upgraded the system. Don't just go out and throw in larger injectors and start crankin up fuel pressure with out expecting to have to have some tuning done. The engine will not like all the extra fuel off nitrous and it will cause driveability issues. Best bet is to stay with your stock and perfectly working fuel system and use a wet kit for fuel enrichenment. I would also have a Stoich meter installed so you can monitor your air/fuel mixture while boosting.
Re: A wet kit is the most safe way to run nitrous>>>.>
Theres also an 850i in the family. I wasn't sure which car I would start the project on. I figured the V12, with it's dual fuel system, and potentially upgraded 19lb ford injectors, I could run about 150+hp without having any supply issues. The next question, is the DME dynamic enough to allow that much fuel in during a boost situtation, while maintaning normal street drivability with the 19lb injectors? Ultimately, I wanted to engineer my own progressive nitrous system. Obviously, this would be much easier with a dry system.
The DME will not allow enough fuel>>>>>>>
You have to remeber these little boxes are stuck with a few correction maps and none you can alter unless you do the chip thing. I am big promoter on stand alones because of the infinite tuning capability they offer. If you are smart enough to engineer a progressive nitrous setup with relays and pressure switches then you will easily comprehend the totallity of stand alone engine management. If I were you I would get the ZEX wet kit. It is easy to install and doesent have a whole bunch of crappy looking solenoids all over the place. It constantly monitors bottle pressure to ensure you of a proper fuel mixture every time you floor it. It will run off of your stock fuel pump and kick in extra fuel under load only. Then when it is off your back under normal engine operating parameters. I would not use a progressive system unless I where going to be putting serious power down.
Re: The DME will not allow enough fuel>>>>>>>
Running a signle Zex setup on a the V12 would definatley be nice, but the cost seems high. Half the appeal with N20 was the fact that it's relatively simple to install. I've been leaning towards jumping to 19# mustang injectors, along with dual M50 Mafs to keep the idle smooth. This should give me the supply I need up to 400+ HP I believe. I'd hope the DMEs would increase their range with the new MAFs and Injectors right? I read about this solution in the 8 series Message board, under the heading "quest for more speed".