After trying two different sizes of twin screw superchargers I am finally going the turbo route. I am trying to get it right the first time. The truck is a 97' Dodge Ram. It has a 408 stroker, automatic, 2200 stall, 4:10 gears, 33" tires and a part time 4wd/all wheel drive transfer case. I have always liked the instant boost and low end power of the twin screws, the reason for my all wheel drive conversion. I told the turbo shop that I wanted low end like the twin screw, but much stronger mid range and top end.

The compression ratio is 7:5-1
Camshaft is a Clay Smith Cam 284-284 duration( 232-232 @.050) .556-.556 lift w/a 110 deg C.L.-installed at 107.
Heads are well ported 2.20-1.65 that flow 292 and 239@.600

I am looking for 15-17 lbs on 91 octane and wanting to get close to or over 600 at the wheels. The engine made 445 rwhp @ 6 lbs at 5,000 rpm with the twin screw. This was at 2.8 times engine speed, maxed out and high IAT's.

Here is what is in process. A set of 1 5/8 stainless custom headers for two front mount turbo's. The turbo's are Turbonetics 60-1 Stage 5(.58 A/R) Turbo's, 4" inlet, 2.5" outlet & 3" down pipe. The two 3" down pipes will be connected to my existing Dr. Gas dual 3" into a single 4" connector. From there I am running a single 4" diesel exhaust with a 4" high flow cat and magnaflow muffler.

Does this sound like the right combination for my truck?
Thanks

 

sounds good to me...
this other guy made like 922 hp at 18# boost with 60-1 turbos so you should be in the ball park...

 

the a/r's sound a tiny bit small for twins on a 408.

 

I was wondering about that. I figured the small A/R's would let the engine reach boost much faster, but limit the top end a little. Since the cam makes peak hp @5,000, I have a 5,500 rpm shift point. Will the smaller A/R's make plently of power to that rpm?