I have had my Roush intercooled Supercharger set up for over 6 months now and I am just curious. Has anyone else with 4WD added a supercharger or turbo to thier truck? Obviously I dont drive it in 4WD on dry roads but I am assuming the added weight from the 4WD hardware is giving me quite a performance hit.

 

About 20-25 RWHP on the Dyno.

 

Mine's 4wd and yes, you take a hit with all that extra drivetrain componentry and weight, but it's sure as hell fun in snow and ice

 

What is it that you want to know about supercharged 4x4s? How much power loss through the drive train? Can you drag race in 4wd? What's your ?. I'll tell you this, my dyno shop tells me that I lose about 25% in power due to the auto trans, and 4wd components. Of course that's all just an estimate on their part. My 01 SCAB 4x4 with a Procharger puts down 320/403 to the wheels. We estimate that's around 400 crank hp. not sure about the torque.

 

i have 4x4 also. my dyno numbers are in my sig. no problem in the snow, and i dont drive 4x4 off season.

 

You have about 6-700 lbs of extra weight. In 4x2 you loose a little more because of the T-case. If you launch in 4x4 expect to see the front wheels pull a little to the side like a front wheel drive car. I haven't launched in 4x4 on dry dry roads for fear of breaking the t-case and or the tranny. My friend with a powerstroke is in the 13s and launches in 4x4. He spins the tires on the rims when he does.

JMC

 

the drivers side CV shaft would be the first thing to go on our trucks luanching in 4x4, it will snap right were it tapers down. and it will pull alittle to the right. i wouldnt recomend 4x4 launches in a lifted truck, on a stock suspension you might be ok

 

Thanks for the replies btw why can I drive long distance in 4wd on dry land? owners manual just says it will cause increased steering effort?

 

Anyone?

 

There is no center diff, so when you turn on dry pavement you get binding in the driveline (becuase the front and rear wheels turn at different rates). This is very hard on the components.

On lose surfaces, the wheels can slip enough to eliminate binding.
On high-grip asphalt or concrete, the wheels don't easily slip.

Same reason why a full-spool rear diff is bad on pavement.

 

Thanks for the reply guess I wont take any chances doing a 4wd supercharged launh on dry pavement....

 

What about the AWD trucks? The clutch in the t-case for the front drive engages as wheel slip is detected. Will this "soften" the power out to the front at all? Or is it gonna be just as bad as 4wd if you nail it?

--Dan

 

Hopefully my 4x4 supercharged truck will be up and running soon, and I am sacrificing performance by leaving the gears with what came in the truck, and not going to 4.10's. If I dropped the clutch with 4.10's in it, even in 2wd, it would probably explode. Basically too much motor for stock rear and tranny to hold. I would never even think about trying it in 4wd. A man has to know his limitations.

 

I don't know about a manual tranny or clutch, but Lightnings aren't having a problem breaking the 9.75-inch rear, so I don't think you need to worry about that.

Even the 8.8 is pretty stout, and can be made bulletproof, but I guess it all depends on your power level and traction.