Sweet! I'll be there

 

After a lengthy visit with Mike I have decided against the compounded rear mount. There are just to many unknowns with this combination. There would be alot of work and expense involved possibly to just find out it can't be tuned properly or the EGT's are to high or?
Kenne Bell says that a twin screw responds well to boost, but it's tricky and to involved to explain or be of any help on.
Whipple says they would not recommend it at all.
One engineer at Autorotor says it should work well and another says not to bother.
I just don't have enough extra cash or time to burn for this project.
So I have decided to go with a custom turbo header 1 7/8 x 3" and a set of twin turbos. Mike said he can come pretty close to matching the low end response/power I'm used to with the twin screw, but make much more power through the mid range and top end. The key will be the proper set of turbos. He has done this custom stuff for years and has quite the track record. He said my existing intercooler is huge and both turbo's can be fed into it. He will probably replace the throttle body with something larger. Mike feels that 650+ at the wheels is in easy reach even with 4wd.
If any of you have Dodge friends I will be selling some parts that will fit the 5.2 or 5.9's, GS Motorsports long tube headers 1 3/4 x 3" & 2.4 Kenne Bell SC with inlet manifold and dual 65 mm BBK Throttle body & 6 assorted SC pulleys

 

I just got off the phone with Silver State. They are going to make my stainless headers in house. I wanted your opinions on the turbo's they are wanting to use. I told them I wanted as close to the low end I'm used to with the twin screw. The motor peaks at about 5,000 so I want to make all my power in the 2200 to 5000+ range. They are wanting to use 2 Stage 5 T-3 turbos with a 57mm housing. Does that sound about right?

 

Does to me man, depending on the A/R of the turbines. Mine are stage III 60-1 (which in this case is a 58 mm TO4E compressors mated to stage III T31 back halfs) For the street I'm running .48 A/R turbine housings to get that near instant boost you're looking for, and will swap turbines (to .63s) for glory days at the track. I'd think being front mount, you can get away with the .63 housings for DD and still have pretty much instant boost to up towards 7k from those turbos.

 

Yeah that sounds about right. I was going to suggest some T3/T4 60-1's. What A/R ratio are you going with though? If you go with the .48 or whatever it is, boost and torque will be a lot like a twin screw.

 

The turbo's are totally new to me. I understand the tubro size and the housing size, what is the A/R ratio? Also do turbo's need outside fresh air, or is underhood air okay?

 

A/R is the ratio between the area of the turbine neck (or tongue) and the radius of the turbine circular part.

Underhood air is okay, cold air is better (but it probably doesn't make as much of a difference as it does NA).

 

The twins are coming!. I talked to Silver State today and my parts are being ordered. I don't know all the details yet, but Mike has driven the truck with the Kenne Bell. He says that he can get me even better bottom end with the twins and at least 125-150 more rwhp. The turbo's will be Turbonetics E57 Stage 5's, rated from 800-1000 hp for the pair. They will be merged into my extra large intercooler and he will be using the FAST 1375 cfm 4b throttle body. He has been swamped at the dyno this week getting vehicles ready for an episode of Pink's. I should get the truck back the first week of October. I can't wait!

 

Just a quick update. They are making the stainless steel headers. They have decided to use 1 5/8 primary tubes for a faster spooling. For turbo's they have ordered them from Turbonetics. They are two 60-1 Stage 5 Turbos with a .58 A/R. They have a 4" inlet, 2 1/2" outlet & a 3" down pipe. I'm really excited to see how this comes out. I only have access to 91 octane and they are thinking 16-17 lbs for the boost. I'm trying to hold them to having it done by month's end, we will see. It will be interesting to see how a 408 Dodge comes out compared to your 408 GM's for the power level.

 

Looking forward to it man, good luck