OdessitPashka

I meant to ask about uneven distribution of fuel and nitrous as many of you stated. If it's safe to add 75hp to stock motor and run it safely, I do not see how it's gonna be different to add the same 75hp to a built engine... Correct me if I'm wrong

Dweet

because the air thats coming in off of the turbo its compressed so it reacts to nitrous differently than NA air. It makes a 75 shot more like a 125 shot. Read that on HP awhile ago. But thats the information Im going by.

So since the nitrous is added AFTER the air passes through the MAF there is no way the MAF can compesnate for the nitrous. The only possible way it can be compensated is by the O2 sensor reading. However the O2 sensor reads the exhaust gas so its reading the fuel mixture after the combustion which is a bad time to do it. If you get what Im saying

silvertibbs

I concur. LOL

JonGTR

OMGZORZ Dweet!!!! 8O

1. The fuel solenoid adds fuel to supply the oxygen you just added with the nitrous. It's NOT a crutch, it's a direct supplement of fuel in proportion to the nitrous.

2. Your ECU doesn't know WTF is going on when you are spraying. It's not reading ANYTHING at this time. It doesn't add anymore fuel regardless of how much nitrous you are spraying. The reason this is, is because the ECU shuts down the o2 sensors and goes into closed loop mode with a preset map during WOT.

3. If you don't add fuel with the properly jetted solenoid, you WILL go boom!!! No crutches, no safety nets. BOOM!!!



I hope not. lol

Dweet

1. id have to disagree with a standard wet kit. DP may be different. The reason I say its a crutch is because dry kits exist and work without it. Its like the 5th injector in the alpine kit. Its just a crutch to say here is a little more fuel so we dont lean out. DP on the other hand is like doing it the right way. You evenly distribute the fuel in each cylinder for the proper stoichiometric a/f ratio.

2. I'll have to look into that one.

3. Apparently you didnt read my post correctly. I said you might avoid detonation by adding a bigger fuel jet. Because when you shoot nitrous into already compressed air you get a bigger shot than it is rated on an NA engine. So you'd have to add even more fuel to compensate. Im not saying add less fuel.

OdessitPashka

Jon confused me now. So fuel will not be added no matter what you do after you max out your MAF sensor?

JonGTR

No. Direct port and single foggers are both the same in that they supply fuel and nitrous through the same nozzle and both require the extra fuel as I said before.


You don't have a fuel solenoid in a dry kit because it adds fuel a different way, through the injectors via increased fuel pressure.
Once again, there is EXTRA fuel being supplied without the ECU's knowledge about it or the ability to control it.



No, it's there to supply more fuel because the stockers can't handle it during WOT. It's also cheaper than buying 4 more injectors. It's not there "just in case". It has a purpose and is always being used. If you remove it, you will go boom!



...Which you will never get without the fuel solenoid or increased fuel pressure, which your ECU is NOT gonna do for you.


Please do! All of this will make much better sense afterwards.


I have been reading it correctly and you're still wrong. Compressed air has nothing to do with it. The reason why nitrous reacts better in a FI motor is because the charge air is hot from the turbo. Once the nitrous cools the air, it makes it denser and therefore more oxygen rich.


All of your posts have pointed out that the fuel solenoid doesn't supply the fuel and that the ECU does it for you automatically. It doesn't and never will. It can't because it lost its ability to read the a/f during WOT.

JonGTR

Not by the ECU. The ECU, intake air, and injectors do their own thing. The Nitrous and Fuel solenoid are a totally different intake system. The ECU does not, nor ever will, know about it.

OdessitPashka

So basically it's perfectly safe to spray after you reached the limit with your maf, right?

Thanks Jon.

PS, fix your double post smile.gif

JonGTR

As long as your motor is built for it. I'll probably do it too since I already have both hooked up. (DP/TC)

What double post?