How well do 4.7s handle N2O?

[KotaKid287]

I'm thinking about shooting some laughing gas to my truck for the track just to try to get a halfway decent time out of it without going back to a 4.56 gear right now. Has anybody been running nitrous on 4.7s? How well have they held up? What kind of shot could I get away with without heavy mods?

[mthandt]

Originally Posted by KotaKid287

I'm thinking about shooting some laughing gas to my truck for the track just to try to get a halfway decent time out of it without going back to a 4.56 gear right now. Has anybody been running nitrous on 4.7s? How well have they held up? What kind of shot could I get away with without heavy mods?

Badly...... plastic, dry intake manifold and thin pistons make it no good. You can run it if you have a tune and know what you are doing but one little mistake and well the 4.7 isn't going to be very forgiving. There are pics of a guy that was running a 75 shot somewhere on the net where it backfired threw the intake manifold. Blew the intake up and peeled the hood open like a sardine can.

[SLT kota]

to put it short, not well. Most people end up blowing them up. It does do a good job at throwing the throttle up into the hood and destroying your hood as well as your motor.

[AIR_RAM]

Originally Posted by KotaKid287

I'm thinking about shooting some laughing gas to my truck for the track just to try to get a halfway decent time out of it without going back to a 4.56 gear right now. Has anybody been running nitrous on 4.7s? How well have they held up? What kind of shot could I get away with without heavy mods?

There is a RIGHT WAY and a WRONG WAY... done correctly the 4.7L can handle a fair share of Nitrous. BUT you must understand that the weakest link on the 4.7L is the piston tops... so go too lean once and KABOOM!

I highly suggest you run a Wide Band Air Fuel Ratio Gauge and monitor your engines AFR at WOT... and make sure you keep it at 10.5:1 AFR to stay on the safe side. If you can do this then you will NOT have any issues.

I know of a 4.7L who has been running 100+ shots for quite a while now without any issues..> I feel he is on the edge but so far so good.

The real problem is NOT the plastic intake or even "POOLING" as some seem to think... People have come up with this theory after looking at the end result after seeing the intake in bits and pieces. The ROUTE cause of these explosions is the piston tops. Your top ring is less then 1/8 from the piston top. This means when you go LEAN (SUPER HOT) the piston top transfers much of that heat to your top ring. Your top ring expands from the heat and locks up with the cylinder... When then happens the piston tops can brake off or worse the cylinders can freeze and ANY intake valves that are OPEN with LOTS of Nitrous/fuel ignite and explode out through the intake valve... This is what causes the plastic Intake to explode into bits and pieces.

So in a nut shell, be aware of the limitations... and run nitrous accordingly. You can NOT afford to run LEAN... Make sure you run the AFR in the 10's and you should be able to run 100 shot all day long.

SPEED SAFE, AIR RAM

[KotaKid287]

Damn, thats more work then I wanna try on that truck right now. I guess I'm gonna have to save for gears again, and then some Caltracs to actually get the power to the ground instead of having a useless 1st gear cause of tire spinning.