408 Sleeper

CHarris
I would like your and others thoughts on an idea I have. I am running a 408 Dodge with the 2.4 Kenne Bell. My motor is low compression, 7:5-1. I am maxing the 2.4 out. 2.78 times engine speed and am still getting only 9-10 lbs boost. I am running 30 degrees timing without any signs of detonation. I figure that my engine should be able to handle 18-20 lbs of boost on pump gas.
Here is my idea it is called compounding and is used quite a bit in the truck pulling circuit. I want to install a rear mount low pressure turbo, similar to the STS. I have room for a second large air to air intcerooler and from there I will feed 12-14 lbs of intercooled turbo boost into the Kenne Bell. I wil slow the Kenne Bell down with a pulley change to 2 times engine speed. It will add another 6-7 lbs of boost which will then go through my existing large air to air intercooler before entering the engine. For the cooling of the supercharger and the turbo I am thinking of trying an oil pump & large filter for each and then pass the oil through fan equipped remote mounted transmission coolers. I checked with Autorotor, who made the Kenne Bell 2.4's and they said I can feed a pressured charge into their supercharger, just watch the temps. The Kenne Bell will continue to give the instant boost I'm used to without lag and the turbo should kick in hard at about 2500 rpm. Am I missing anything?

Here are my Vehicle Specs:
SLEEPER:
1997 Dodge Ram 1500 Club Cab, 4wd, 5.9 automatic. Emerald Green w/Grey Interior.
4.10 gears
Detroit Tru-Trac Lockers Front & Rear
Mag-Hytec covers.
Centerline Sunray rims 17 x 9.5"
B.F. Goodrich AT KO Tires 305/65R 17.
Rancho shocks w/ 2" leveling kit.
Calvert Traction Bars.
Custom billet grill & full width billet bumper insert.
Custom class III hidden hitch.

Engine:
5.9 360 @ .030 M.P. 4" stroke f/408 CID
Childs & Albert rods
JE forged pistons 7:5-1
Childs & Albert Zero gap rings.
Precision balance & blueprint by Stewart@Drivetrain Unlimited, St.George, UT.
ARP main & head studs
Barton roller timing set.
Clay Smith Cam 284-284 duration( 232-232 @.050) .556-.556 lift w/a 110 deg C.L.-installed at 107.
Fastman Ported RT heads w/2.02-1.625's.
M-1 4 barrel intake manifold(335 cfm, ported by Junkyard Ed).
Crower stainless steel roller rockers 1.6 ratio, heat treated pushrods & Triple valve springs.
Milodon 4x4 oil pan(9qt).
Mopar Performance SFI steel balancer.
Golden West 195mm overdrive crank pulley.

Cooling:
Griffin Radiator
Spahl Dual 14" electric Fans
160 Thermostat

Induction:
AutoRotor 2.4 HO Twin Screw Supercharger.
South Florida Pulley's Non-Slip pulley 70mm(2.78-1, 14 lbs constant boost).
PSE custom inlet manifold 1485 cfm.
PWR 1,500 cfm 3-row air to air intercooler.
3" mandrel intercooler tubing & fresh air inlet by Silver State Motorsports.
BBK 65 x 65m Cobra throttle body, 1340 cfm.

Ignition/Computer:
MSD-6 BTM ignition, blaster coil & MSD 8.5m wires.
Speed Pro EFI: wide band closed loop computer with 2-bar map sensor
Re-flashed OEM computer(for top speed, trans shift rpm & WOT ac switch off.)

Fuel System:
Aeromotive A1000 600 lb phr in tank pump.
Holley high flow injector rails, -8an supply & -6an return system.
72 lb engine injector set.
Aeromotive adjustable regulator w/1:1 ratio.

Transmission:
APS Super Torque Twister: 6-pinion steel planetaries, front, middle & overdrive.
Hardened input shaft.
5 clutch direct drum.
Quick Ramp 10 vane pump.
Diesel overdrive assembly.
Radiator sized Transmission cooler.
SRM Sportsman Valve Body.
BD Pressure Lock, Remote Cooler w/Fan & Remote Filter.
B & M deep pan.
APS Super Torque Twister Billet Converter 2000 stall.

Transfer Case:
NV242 AMG(Hummer H1) that has been modified for the Dodge. It has 4wd low, 4wd high, 2wd(for the dyno), Full Time 4wd for street fun. Custom built by transfercaseexpress,com.
Novak Conversions Shifter.

Brakes:
Stainless Steel Brakes: Vacuum Pump
80mm Big Bore front brake kit.
Big Bore Rear Disc Conversion.

Exhaust:
GS MotorSports Power Plate RT headers 1 3/4 primary tubes w/ 3"collector.
3" mandrel crossover pipe, Dr. Gas dual 3" into 4" Y merge pipe.
Random Tech 4" high flow CAT.
Magnaflow 4" mandrel cat back diesel exhaust system & 30" Magnaflow diesel muffler, stock exit.

Dyno Tuning by Silver State Motorsports, Las Vegas, NV

yurs78

Sorry to ask but your sig is changed. What was your previous best with the maggie and the nos? Just to compare what you've done now. (great numbers)

CHarris

iTrader: (5)

Sounds like a cool combo you have right now. You mention maxing out the blower. What is your pulley combo? Maybe you are just out of pulley and not out of blower yet? I've got the biggest possible crank pully and the smallest offered blower pulley. I can go custom and get up to a 1/2 inch smaller blower pulley made. I can still make a lot more boost. I kind of like that the 2.8 seems to loaf along. I can still run 21-23 degrees of timing.

I think I would really just look at a 2.8 instead of all the complication. Or go with a big turbo!

CHarris

iTrader: (5)

Best with maggie and Nitrous was a 13.86. Best with Maggie only was a 14.08 if I recall correctly. Both were without cats. It was about a 70 rwhp shot that I ran back then.

This combo doesn't hook as well but is already up 1 mph. I've got some chassis changes coming too to help it out.

I think I've got another 3 to 4 tenths coming here soon.

zippy

Do you feel that the converter is too loose and losing some time for you?

CHarris

iTrader: (5)

I don't think so. The extension is decent as well. It would be better if I shifted at 6500 instead of 6300... but I'm trying to give it a little bit of a break

My 60' is a big thing hurting me... I'm planning a drop on the truck and some front travel limiters to run at the track. Those should help a bit. The truck likes to really move around a lot when you hit the throttle. If I could get that power down it would be better for sure.

Also... the cats just suck. It really doesn't help that I have the Supermaxx headers with the 2.5" collectors either.

I'm not planning to build more boost until I sort all this out and see what it can really do.

zippy

Traction is one of the issue's that was part of my thought with the converter stalling that high. I'm assuming that you're still having traction issue's with the launch. From there on out I was also guessing that the big torque numbers from a blown 6.6L would be strong no matter what the shift extension was. Unfortunatly it's more of a guess than anything.

1slow01Z71

iTrader: (36)

Any updates?

TouchOfEvil04

iTrader: (13)

That thing is moving for the weight of it.

CHarris

iTrader: (5)

Hi guys... not blowing this off of the pm's i've received. I'm just super busy. We were working straight 12 hour days with no break for almost 2 weeks. Looking at forced overtime again this weekend.

I have installed a Mezeire water pump and hoping to work on the exhaust soon. The truck seems to rev quicker without the mechanical waterpump.

I've also gone with a max ported LS2 TB from my own stock. I had a stage one port on it before. Again.. feels like it has improved.

I've also done a McGaughys 3/5 drop. I modified it for a 3/4 drop since I liked that better. Should be a little more aerodynamic with this as well as less motion/energy lost in suspension. Seems to take off straighter with less drama. Hopefully a quicker 60 ft is the result. If not... cool exterior mod

if you shot me a pm... I'm working on answering!