going to be selling my p1 to a friend and getting a d1 to replace it. im running 9lbs of boost right now and would like to keep it the same if possible with the d1. what size pulley will i need with the d1? im running a 3.7 right now on the p1. i just ordered a bigger inter cooler and going to fab up all of the tubing like i did my intake, make it all one piece from the head unit to the inter cooler , and the inter cooler to the maf censor and then to the t/b. anything else that im going to need let me know.

 

motor size cam ?

 

also what size motor and what rpm do you shift at?

You are loosing some boost with that intake tube and you are probably heating the intake charge more with that long metal tube[over the hot engine] than if you just ran a filter on your blower.I was running a 3" inlet filter and then switched to a 4" right on the blower and picked up almost a # of boost.

 

i got a 6.0 and its running a strong 9lbs of boost right now,i didnt see a drop in boost when i put it on according to the boost gauge and these are my shift points...

Desired WOT 1-2 Shift Point: 6000

Desired WOT 2-3 Shift Point: 5900

Desired WOT 3-4 Shift Point: 5900
and i have a cam on the way that will be going in in the next couple months... 220-224 585-595 115

 

Call them up and see what they rec. I think a 4.0 pulley will get you 10 or so with the D1

 

I shift @ 6000 also and run a 4" pulley with my D1SC.It makes between 12-13 #'s at my shift points.Depends on the outside temps.

 

what fuel set-up do you run and who tunes it?

 

i got 44lb@58psi injectors and got a walbro 255 intank , and justin from black bear did the tune thats on it now.

 

so your currently running the stock cam?

are you running meth?

 

When I ran 4" exhaust wrap covered aluminum tubing from the head unit to the OEM fitler location, I saw about a 10 degree drop in AIT's but it cost me about 1/2 lbs of boost (dropped from 10 to 9.5).

Sounds about right. You will have to run a 4.25" to stay down around 10lbs. The nice part is you won't have any issues with belt slip.

Rick