Stock 4.6 2V longblocks can handle roughly around 400rwhp. There are a few running 400-450rwhp on their stock blocks but you're really risking the longevity of the motor. So, with you mods you should be in the area of about 275rwhp give or take. I wouldn't go bigger than a 125-shot.
It's actually torque down low that is the cause for blowing these motors up, not the horsepower up top. There are a hand full of Centri/nitrous cars making 500+rwhp on the stock short block. The nitrous cars are waiting until a little over 4000rpm to spray, and centri cars are known to not make very much torque down low, but make a lot of power up top. So this allows them to push the envelope farther than say a Kenne bell or Tork Tech car could.
You can say you wont miss gears and there wont be that one time all you want. You are going to miss a gear at some point or another and when that intake blows into pieces, you are going to wish you had spent that $120 on a window switch.
It's actually torque down low that is the cause for blowing these motors up, not the horsepower up top. There are a hand full of Centri/nitrous cars making 500+rwhp on the stock short block. The nitrous cars are waiting until a little over 4000rpm to spray, and centri cars are known to not make very much torque down low, but make a lot of power up top. So this allows them to push the envelope farther than say a Kenne bell or Tork Tech car could.
It's actually torque down low that is the cause for blowing these motors up, not the horsepower up top. There are a hand full of Centri/nitrous cars making 500+rwhp on the stock short block. The nitrous cars are waiting until a little over 4000rpm to spray, and centri cars are known to not make very much torque down low, but make a lot of power up top. So this allows them to push the envelope farther than say a Kenne bell or Tork Tech car could.
Peak torque on a nitrous car using a "wet" kit will be the moment the nitrous system activates. So in that sense, the torque down low = peak torque.
Is it "torque down low" that causes the failure, or just torque in general (as in, peak torque)? The amount of torque a motor makes is directly related to the cylinder pressure. The cylinder pressure is highest at peak torque, which would make me think that the most stress on internal engine components is whenever the car is producing peak torque. But I don't know. Maybe I'm missing something here. Educate me.
And on top of that, the fact that it takes extra power to turn a positive displacement blower, versus much less for a centri and none for nitrous/turbo, puts extra stress on the internal components.
For example, a 400 rwhp nitrous or turbo car is making (400 hp + [whatever is lost in the drivetrain]) at the motor, which is probably in the 450 bhp range.
For a 400 rwhp PD blower car, the engine is making (400 hp + drivetrain loss + what it takes to turn the supercharger). And I've read before that that number is in the 50ish hp range for 10 psi of boost. So that particular car would actually be making over 500 hp at the motor.
And 50 extra brake horsepower when you are ALREADY close to double what the stock components were designed for is significant.
Wow, of the many many years that I been spending learning about Mustangs, I have never heard that concept. Interesting.
It's actually torque down low that is the cause for blowing these motors up, not the horsepower up top. There are a hand full of Centri/nitrous cars making 500+rwhp on the stock short block. The nitrous cars are waiting until a little over 4000rpm to spray, and centri cars are known to not make very much torque down low, but make a lot of power up top. So this allows them to push the envelope farther than say a Kenne bell or Tork Tech car could.
I copied this directly off the kenne bell website.
Centrifugal people say that high boost from the Kenne Bell at low rpm can damage my engine and drivetrain. Is this true? That's a good one. I know of a lot of engine builders who would find this hilarious. I was always under the impression that popping the clutch at 4000-6000 rpm and revving the engine through the gears to get the boost up was a little rougher on the engine and drivetrain than punching it at 2000 or 3000 rpm - but as Dennis Miller always says "I could be wrong." Let's get real! No one ever blows up an engine at 2000, 3000 or 4000 rpm. They blow at 6000-7000. Always remember that the inertia loads on the bearings, rods and piston go up with the square of the rpm increase - another reason why supercharging has become so popular. Supercharging with the Kenne Bell does not require high rpm and high loads to make horsepower as it pressurizes the cylinders throughout the entire rpm range.Think about this scenario. The driver determines that his car needs 400 ft. lbs. of torque for a good launch. The Kenne Bell makes 400 ft. lbs. at 3000 rpm, but Supercharger "B" requires 6000 rpm to produce 400 ft. lbs. Now which has the best chance of damaging the drivetrain?
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