Nitrous and Water Injection

[GRotman]

If you are cleaning up all the fuel you have, adding more nitrous will cool it back down.
For a reference, on Redstroke's truck running 5 stages at .135 each the egt's would hang at about 1600 ° but he still had available fuel to burn.This was with a 13mm pump. The same set-up with a 12mm pump maxed out at 1400 °.

[GRotman]

Also, the 5th stage was only good for about 20hp. I believe this was due to the intake air temp dropping too low, we needed to either push the chargers harder to increase the air temp or go to bigger chargers with more volume of air for the nitrous to cool.

[SnowTech.4]

Originally Posted by JQmile

Add more nitrous, EGTs will go back down. I'd feel allright running water with nitrous, seen a few hard running diesels do it. Both Jeff Prince and Mike Woods run N2O and H2O.

Bingo. Mike uses us and nitrous with no intercooler at all

[SnowTech.4]

GRotman,

Great info, makes complete sense.

I would think though that the wastegates would reduce back pressure quite a bit and help with EGTas a result. Sure they will limit boost a bit which might reduce the 02 available to work with, but I think the setup would be running more efficiently at the lower boost, so the loss woud be less. In other words, the reduction of back pressure helps reduce EGT more than the lower boost raises it. Especially if more nitrous is put in.

[GRotman]

You would be correct if the turbo or turbos were being pushed out of their maps. Then wastegating would help bring the temps down, as the turbo would come back into its effeciency range.

[powerstroke113]

Thanks guys.....lots of great info!

[powerstroke113]

Originally Posted by SnowTech.4

I think you nailed it. Nitrous is adding a lot of 02, which often will help with EGT in a heavily fueled tune.

But in this case thats obviously not happening. It's acting almost like a gasser in this regard, where more 02 means more heat.

What sort of boost increase do you see with the nitrous?Wastegates will help with reducing back pressure, which will probably have a very nice impact on EGT if your turbos are moving air well at a lower boost already.

Sounds like we need more water :rockwoot:

Boost pressures doesn't really increase that much..... 5 psi. I know it is over spinning the crap out of it because i destroyed a charger. Drive pressures im sure were outrageous. .

Any ideas for more water.....i know my snow stg two kit isn't nearly enough

[SnowTech.4]

What two pumps are your running right now? We might be able to upgrade your existing stuff and not re-invent the wheel. Or add to what you have without getting overly elaborate. Simple is beautiful.

The turbos spinning that hard makes me think that the WGs will get them back into the efficient range a bit along with dropping back pressure. You might get less boost, but overall I'll bet EGTs go down. Thats a guess though.

[JOHNBOY]

Originally Posted by JQmile

Add more nitrous, EGTs will go back down. I'd feel allright running water with nitrous, seen a few hard running diesels do it. Both Jeff Prince and Mike Woods run N2O and H2O.

On Mikes Woods car when we added enough N20 to lower EGTS the car went slower.

N20 does add O2 which depending on the fueling can either add or lower EGTs. Lean can be hot and so can rich. But to lower EGTs you need to add alot. Most will never spray that much which is why they see an increase in EGTs. Personally I would not spray that much as it has prove to me that to much is not quicker.

[JQmile]

I think if you're running big nitrous, some type of progressive system is key so that you can ramp up really big stages without putting the fire out all at once. Well, unless you're Brian Carter, then you just hit 3 big stages and go 10s in a dually