Currently both my nitrous and fuel solenoid are wired through a common relay and activated by a single signal from the WOT switch.

While having my car tuned the other day the tuner showed me where there was a sharp torque and horsepower spike before the system stabilized at 343 HP and 358 torque. He said the spike is a result of the nitrous reaching the intake track before the fuel (nitrous at 1000 PSI VS fuel at 50 PSI in equal length lines between the solenoids and the fogger nozzle).

So the question is: Is anyone using a delay between the fuel activation and the nitrous? If so, how long is the delay?

 

The spike is normal. Fear not and let her rip.

 

The spike may be normal but I'm looking for a way to minimize it.
I've sketched out a schematic using 2 relays, with the second relay powered by the first. With this approach I can fire the fuel solenoid with the first relay and the N20 solenoid using the second relay. This type of serial approach will cause a .010 second delay (the time it takes a relay to activate) of the N20 solenoid.
Also since I'm using a dynotune 2 channel controller I can try running the fuel and nitrous on seperate channels with start RPMs staggered by 100 RPM.
I'm going to try it! stay tuned...

 

just an idea, try using a longer hose. im a newbie to nitrous so im just throwin out an idea because it seems alot more simplified than all the relays

 

Sorry Red, was having a rough night at work yesterday. Have a look at this.

Click Me

You can always ramp up the solenoid. Start at zero and ramp quickly and you can ramp the noz only if you wanted. You can always play with it for traction issues also. Let me know if I can help you out.

 

If you consider the differences in pressure the nitrous hose would have to be 10 to 20 times longer than the fuel hose.

 

I've seen this, thanks, that's a great solution but to a different problem.
I'll keep looking for a way to delay the nitrous solenoid activation.

 

dont delay it too much because if the fuel puddles up before the nitrous you will have a nice backfire and possibly blow your plenum off through your hood

 

Yea, that has me worried!
I was thinking about setting a 100 RPM delay.

 

you should not worry about trying to delay the nitrous... It will be fine, just spray over 3000 rpm and the instant torque will not hurt anything

 

dude, you nitrou system is fine. nitrous power is rpm dependant. you'll see a spike for a good 400rpms and then it levels out...the earlier you spray, the more the spike b/c more nitrous/fuel is going in between each revolution. If you think your spike is bad, you should see my dyno from 150 shot. 200 ft/lbs spike of torque in about 300rpms.

 

Look, I understand that conventional wisdom says "it's OK, don't worry" but I see an inconsistency in this process.
A lot of importance is ascribed to getting the jets right in order to keep a proper fuel ratio, byt no one seems to care that nitrous is getting to the fogger nozzle (.xxx seconds I don't know how long) before the fuel, meaning that for some amount of time the car is running lean.
Can anyone explain why this is or isn't important?
Jeremy, do you want to chime in?

 

And if it was soooooooooooooo important, don't you think that the noz companies would have addressed this "problem"? If it was such a problem with engines blowing up left, right and center, don't you think that noz would be dead? Give up the ghost man, just move on.

 

I've read some stupid things you've written on this forum without commenting but this goes beyond stupid!
You are nothing but a sheep, willing to follow or mindlessly bleat out what you've heard someone else say, but not smart enough to think for yourself or question something that on the surface doesn't seem right.

If you have nothing constructive to say then just leave it alone. If no one knows the answer to my question then I won't get an answer here, but the last thing I need is a moron who thinks that if he doesn't know the answer then it doesn't exist.

Who said anything about engines blowing up left right and center?
not me!
And when did you become the voice of the "noz" companies?
not ever!

 

Now that was funny. Thanks for the laugh. Bye Bye

 

wow...interesting rant! If you are so worried about delaying the spray 100 rpms then just set the delay and give us your impressions. Obviously no one here is worried about it

 

I have tried setting a 100 RPM delay but I couldn't feel a difference. I'll probably have to take it to a dyno to see what's happening.

 

Just use a progressive controller, set it to start from say 50shots, then ramp up to 100 shots in a small rpm window (less than 500rpm), then even if the nitrous gets into the cylinders first, it's only a small amount, it will not cause knock, and with a progressive controller you can smooth out that torque spike.