Ok, this plan is not going to happen any time soon, but, I'm planning to put a larger supercharger on top of my new 408 in my truck. Of course this will be after I pay off the new motor and after I put a built 4L80E in the truck and new fuel system, etc. I'm thinking 1yr from now, hopefully. Which kit would you do and why?

 

Don't waste your time on a Procharger
With a large truck like yours you need something to come on fast down low
The Procharger isn't even gonna come until after 3k
For my Money i would consider the Whipple First Or a turbo setup
Don't know to much about the rotex twin kit
How much power will it be good too ?

 

I agree. With a heavy truck you need more torque to get it moving. The Whipple or a turbo will give you what you need. Rotex is more like the Procharger except that they have a higher impeller speed.

 

my goal is 800+rwhp. I agree, i want torque, and lots of it.

 

Turbo will do the trick.

 

The Rotrex twin 38-81 on a stock displacement 6 liter produced 960hp and just over 800ft lbs. The engine had forged rods and pistons, a mild sc cam (800rpm idle) and headers/3 inch duals with high flow mufflers.


Kurt

 

I'd really like to see more of these rotrex sc's on ls1's. They seem like an excellent product.

What kind of power does that GTO make Wheel to wheel (427)?

 

W2W intercooled twin Rotrex

they are awesome

 

Yeah I saw this kit first hand at PRI and it looked very nice and was packaged well.

 

The GTO was done last winter and we ran the engine in the spring. My memory is getting bad, they say its the second thing to go....can't remember the first!
The engine is a 389 (of course) and produced around 600hp.


Kurt

 

The #1 thing would be a nice big Turbo but I really don't think you'll be happy with how much it would cost and the continuos parts breakage.The F1 would be the best bet because it can give great midrange and actually be softer on the driveline.

 

Whipple for the truck. The Rotrex units are still centrifugal units that build boost proportional to rpm. They'll come on around the same time as the Procharger.

Jim

 

anyone have thoughts on the Livernois turbo setup? looks like it's around $6000 complete with larger turbo. That price sounds fine to me. Especially if I can sell the Whipple and the 6.0L for a decent amount of money. I should be able to pay for at least half of it at that point.

 

What thoughts are you looking for? I'be been in/driven Livernois' turbo
Escalade a 100 times at least. The kit is awesome...power, quality, appearance,
etc.

 

I saw that thing went 12.8 or something. Not too shabby. I am hoping to be WAY faster than that. Same race weight as that escalade 6050ish. That run was on the 67mm turbo i think right?

With the livernois turbo (biggest one) strapped to my 408, what kind of power should i see to the wheels?

 

I really couldn't tell you. Livernois' Escalade was never dyno'd since it's
AWD and they don't have an AWD dyno. I would imagine it peaked at
750rwhp or so. Granted, they didn't try to break any power records
with it since the motor was (is) 100% bone stock.

It did run a 12.8 @ 107mph. There are vids & pics all over this site.

Personally, I would never bolt on a centrifugal blower...or a positive
displacement blower...and that's from a guy with a Kenne Bell.
Turbo is the most efficient power adder. If you're looking to make big
power, run a turbo. Slap a 76mm on that 408 of yours and hold the f*ck
on!

 

None of this is gonna happen till I pay for the 408, probably next winter. I guess I've got some time to think about it. I'm trying to gather as much info as possible before dropping another $6000+

I'm diggin the Livernois turbo kit simply because I don't see any other complete kits for my truck other than STS. Not that STS is bad as far as I know. We'll see.

 

We did chassis dyno a 408 AWD SS Silverado with a Livernois turbo kit with the optional 76mm turbo. It put down 55X on pump premium with a meth kit. That power would run low 12's with a decent converter.
My truck with a W2W turbo on a forged 6 liter:
67mm turbo with 3500 stall went 11.75-11.79-11.81 on the third leg of Power tour last summer. It was 5516# with full tank of gas. With these parts and tune it made 57X@ the wheels.
70mm turbo with all the same parts ran a best of 11.4X at 131 dragway at the SS Silverado track day, it made 60Xhp@ the wheels . This was after a 3 hour drive to the track. I tried to run faster by leaving harder/higher boost, but it spun all 4 tires and slowed down.
I have never tried a bigger turbo because the truck is my daily driver and the boost with the smaller turbo's comes on quick and makes driving a pleasure.


Kurt

 

I would be willing to bet I'll make 550ish rwhp with my 408/whipple combo. We'll soon find out.

427, shoot me a price on a turbo kit for my truck with the larger turbo. thanks

 

Please school a truck newbie (me) about the Whipple blower and kit...assuming
a kit is provided. It is intercooled right? Hopefully. What are you going to do about
heat soak? My KB gets hot as **** and drops damned near 50hp in the heat of the day
in the summer.

Is it air-to-water intercooled?

I'm not sure what route you're going, but if you're interested in Livernois' turbo kit...
just shoot me a PM. I'll forward it to my boy there.

Good luck with whatever combo you run!