Intersted to know your reasoning? I understand that more power can be had with a twin screw over a roots style but maximum top end power is not the goal of this project? Plus a roots blower is a tenth the price of a comparable twin screw. For the price of a twin screw I would just go by a full coyote drivetrain....
Sorry for the confusion, but I was referring to Twin Turbo. OP was already contemplating going this route based off the F150 ecoboost manifolds. Twins can offer a nice a nice low and top end if setup correctly.
Ahh ok makes more sense now. This is the exact issue I am debating between... The twins will make some decent low end but not nearly as instant as the roots blower. That said, I think both will have an issue with dying out up top... The biggest issue I have with the twins is that there was apparently difficulty in tuning the setup due to the size of the turbos. I think the roots blower might be a bit easier to tune for considering they already have a supercharger tune created for the 3.7. I could be completely wrong here though...
:shrug::headbonk:
I believe the issues you had with back pressure was the result of the restrictive F150 manifolds along with your stock diameter 2.25" exhaust. Those two things alone I think are killing any top end power the turbos and engine can produce.
I have now swapped to catless downpipes and full 3" catback exhaust without mufflers.
Have not re tuned yet. It is on my to do list, but I have been bogged down with school work lately.
I am thinking mid next month on pulling the trigger on the custom turbo headers and completing a twin turbo setup. I will be sure to create a thread/update my project thread on my progress. If you are interested, we can see if they will create another set of headers once I can confirm that the first set fits.
Thinking about it.... haha
Who is making the headers, and are you trying to have them be a direct replacement or will they be difference dimensions?
A company called GP Headers. I have seen some of their work first hand and was very impressed. Hoping to get the headers made from 321 stainless. As far as dimensions go, my only requirement for this is that they keep the turbo in the same location as OEM. Other then that they have free reign on how to route the pipes.
