Big Injectors = More power with Spray

[Transamman25]

Ok anyone else heard of this say i run 42lbs injectors at 80% .. a buddy of mine had an idea i should run 50lbs injectors to accomidate the extra fuel needed to Spray big shots with out the need for retarding timing.. does this make sense to anyone else ?

[Chris 96 WS6]

If your 42s are at 80% DC there isn't anything to gain with bigger injectors.

[Transamman25]

So if i spray (200 shot)and my injectors are already at 80% DC .. where will the fuel come from .. thats the way it was explained to me .. What do you think Chris ?

[Zupercharged28]

i think theres only one way to find out for sure!!! PUSH THAT BUTTON!!! i cant do-it captain...i havent got the POWWWEEERRRRR!!!

[Grims]

So if i spray (200 shot)and my injectors are already at 80% DC .. where will the fuel come from .. thats the way it was explained to me .. What do you think Chris ?

From the fuel solenoid.

[Chris 96 WS6]

From the fuel solenoid.

Right..if its a wet shot. Otherwise he might need more injector. I didn't read close enough to see there was a shot involved.

[Transamman25]

Its a dry shot so that might explain his reasonings - im in the dark on this Nitrous stuff .. ive just recently started tinkering with it

[LiquidFire350]

If its a dry shot the extra fuel comes from your fuel system, and if that was the case I wouldn't suggest a 200 dry, I'm not too fond of any over 75 on a dry shot.

Now if its a wet or direct port (which is still a wet shot), a secondary fuel line is ran and the fuel is sparyed along with the nitrous.

[CamTom12]

80% is as full of a DC as I'd comfortably take an injector on a dry shot.

If you're upping your shot, I'd up your injectors :)

EDIT: and as far as large dry shots go, I'd ask 860 for their advice on that subject. I think that as long as you don't loose fuel pressure and your injectors can keep up, go nuts!

[Grims]

200 seems huge for a dryshot.

[CamTom12]

so long as you can supply the fuel, it doesn't matter how you do it.

if your fuel system can keep up I don't see any reason why it would matter using it versus using supplemental fuel (wet shot).

[Helmsdini]

The theory is flawed because fuel has little to nothing to do with timing. You will still have to retard the timing.

Other than that, if you are at 80% DC, and using a through the maf type system you will benefit from going to larger injectors, as it will give you the potential to add more fuel. This only helps on the fuel side of things though. Basicly the through the maf nitrous will peg your MAF and make your duty cycle go to 100% on the nitrous (and even a little afterwards if it freezes the wires) so depending on how much extra duty cycle you have in between your WOT cycle and 100% is your margin for added fuel while on nitrous.

Basic theory: bigger injectors with through the maf dry systems are always better because these type kits dont boost fuel pressure in any way.

[Transamman25]

How much Timing should be pulled .. oh mighty and awesome moderator of No2 ?

[CamTom12]

As much as you need to time the flame front, or pressure wave.

See, here's how timing advance works...

Fuel and air takes x seconds to burn in a given cylinder head. Now, what we want to do is time the peak pressure to just a smidge past TDC by starting the fire a little earlier than TDC. That's how timing advance gives power. You just keep starting the fire earlier and earlier until you hit that point (you'll know it because a little bit more timing makes no more power. I keep the least amount I need)

Fuel and N20 burns much faster than fuel and air, so it takes less timing advance to match the peak with the piston position.

With fuel/n2o I'd pull a bunch of advance out, then add it back in increments to see where you make the most power, just like you do with fuel/air

[vernw]

Isn't the general rule of thumb 2 or 3 degrees of timing for every 50HP shot?

[LiquidFire350]

thats a "rule of thumb" but more power can be made by actually tuning