I have heard that the D1SC maxes out somewhere between 18-22#'s of boost. Does this sound accurate? Also, I need to figure out what exact size pulley I currently have, so I don't over spin the impeller.

Does anyone out there with high boost on their D1 have anymore info?

 

It pushes a certain amount of cfm, not a certain amount of boost. Boost is only a measure of engine restriction, so max boost will all depend on your engine's breathing. The more cubes and the better it breathes, the less boost you'll see when it's maxed out.

 

My setup is as follows;

383 LT1 (Lunati Sledgehammer Crank, Oliver Billett rods, custom Diamond pistons)
TPIS CNC LT1 AFR 180 heads
Custom Camshaft 244/254 @ .050, .578/.578 lift, 114* LSA
Hand ported intake manifold
Hooker Long Tubes
Hooker Y-Pipe
Borla Cat-Back
Lingenfelter 58mm TB (the gigantic brick one)
60# Injectors
M6 w/Moser 12 bolt and 3.73's
EPP Custom FMIC setup

On the dyno, I did 15.3#'s of boost at 7,000 RPM. Basically I am trying to figure out how much room is left to max out my D1SC on boost here. Ultimatly I need to find what pulley size I have.

 

what combo of pullys max out the impeller?

 

I would say you might be very close to being maxed out at your current boost level. The fact that you have 383 cubic inches, ported heads, intake, etc. and still over 15 lbs. boost is a lot.

If the motor were a stock 350ci. still without all the porting, then D1sc's might be able to hit around 20 psi. or over. So you might be about maxed out.

For some more power, you may want to strart looking at some other things, such as larger heads (AFR 210's), different cam, etc. Also, if you still have the stock blower intake piping, you can look into getting some solid metal brand brad tubing. The stock piping tends to restrict air. Many people have picked up around 2 psi. of boost by just getting rid of the crappy stock blower intake piping.

How much RWHP are you making with that set-up? If you REALLY need more power after considering the things I said above, then you will need to look into upgrading to the Procharger F1. goodluck....

 

Tell the me Blower pulley and the Crank pulley and I will tell you how hard your spinning the blower at 7,000 RPM.
Also, what intake setup do you have on it 90 degree or stock ATI inlet???

 

Max impeller speed for a D1SC = 62,000.

Crank pulley/blower pulley X 4.10 X max engine RPM = Impeller RPM

 

assuming you have a 12 rib with a 7.6 crank pully you would want the 3.55 blower pully to max your charger at 7000. That is the pulley combo I run on my car and I max my D1. I have very effecient piping no IC and a custom hard intake with huge filter. I see 20-22 on my 396

 

Well, I was hoping I had some room left for boost. Although the heads are ported, they are just AFR 180's.

The crank pulley is on the ATI super dampner (same size as the stock crank pulley). As for the actual blower pulley, I need to find out. I think it is rated as a 10# pulley, but again I need to find out the actual size.

BTW, I am running on an 8 rib setup, but I also have the SD concepts tensioner, and am making 590 RWHP (no belt slippage what so ever) on a very conservative pump gas tune on a mustang dyno. Realisticly on a cooler day and on a dynojet, the RWHP probably would have been more like 620 or so. I am looking to increase the RWHP by about 30-50. I figured if there was room left, another 3-5 #'s of boost, and a new dyno tune should do it. Also, the inlet tube is stock from ATI (the new hard plastic one) but a MUCH larger aftermaket filter. After seeing almost 15.3#'s of boost on the dyno with no filter, and only 9#'s of boost with the stock air filter, I changed to my current filter which brings the boost up to the same level as with no filter. So, I am not sure changing to one of the hard 90 degree metal tubes would do much, however I may still try it.