Wondering if any of you have ran 150 shot on a stock 4.6.... I am thinking about doing it with a seperate fuel system, spraying methanol to prevent any kind of detonation.... 2 steps colder plugs stock timing with the methanol 1997 gt with basic mods Long tubes, full exhaust, cold air, fuel pump, ect ect.. just hoping it would last more than a few minutes Shooting for 400 rwhp on a stock longblock and ill be happy
The problem with spraying 150-shot isn't the detonation, its the possible case of fuel puddling in the lower intake. Fuel that can sometimes cause a backfire that will literally blow it to pieces. If I was going to run that much squeeze in my engine and I hadn't already purchased a kit, I might look into a "dry" style set up, to eliminate the possibility of fuel being introduced into the intake manifold at all. If I already had a wet kit installed, I wouldn’t run it beyond 125-shot on the street and/or would look into some sort of tougher, aluminum intake manifold with a better design that didn’t invite fuel puddling in the lower runner section and could actually take a bit of a hit in the event it ever did backfire.
It’s mostly the intake design of the manifold itself. In order to promote low end torque up on the small displacement 4.6L, Ford had maintain a long runner intake manifold design. Since space on the top side of the engine is limited, the real estate within the intake galley of the block is where Ford chose to make up the additional length needed. The runners snake around to the bottom of the intake galley and meet centrally within the bottom of the manifold directly under the section of the inlet where the upper elbow attaches. No issue when you’re flowing just air through the manifold, but when a wet kit is used, fuel is sprayed into the intake ahead of the throttle body along with the nitrous, where it goes strait down into the lower intake pocket where the runners meet. When the larger amount of fuel required to run much beyond 100-125hp nitrous jets is used, some of that fuel tends to remain in the bottom of the intake manifold because the airflow present is unable to carry it the 180* turn and several inches that it needs to, in order to enter the intake ports of the heads. All it takes is one good misfire to ignite said unspent fuel and cause what’s often a catastrophic backfire. Small amounts in the 50-100hp range are often not an issue, since there is less fuel being added to the airs tream and atomization isn’t so much of a problem. But when getting up into the 125.....150hp range, it’s not so easy to atomize that much fuel and you get….BOOM!!!
Fuel puddling in an intake is so not a good thing. The shop that works on my car has a GT40 upper hanging on the wall with a hole in it you can stick your hand into and not touch anything. Thats what made me buy a dry kit. I also have the Spring Break Shootout from about 2001 on VHS and there is a Mustang that blows the hood about 20ft in the air. It completely destroyed his Edelbrock intake.
I had 150 shot on my stock 5.0 for a while just retard the timing and it ran great when sprayed but i had a dry kit if u set the kit up correctly you should have no problem
i have 125 in my car but i thought as long as you had a window switch that wouldnt release the nitrous until 3500 rpms or so it would be just fine anyone that can enlighten me please do because i am getting ready to purchase some 150 jets.
