[KingLT1]

Originally Posted by TJay74

Hoping to be in the 625-675 hp range.

I wonder what the D1x would do for my setup now.

Not much for that power level.

[oldman]

yep the D1X is "barely turning" at 650 to 700 WHP...
https://www.procharger.com/p-1x-and-d-1x-superchargers

Note the P1 has higher speeds ie can use a smaller pulley, and cars with stock cams (less rev range) can do smaller pulley. As you approach 7000+ RPM cams... you pulley size is limited with the D1 supercharger.

Boost is related to flow, a fully built engine with headers is going to show less "boost" for any pulley size; that said with bigger cams the engine will see more boost on the top end, peak boost on my setup is at 6900 RPM, the impeller is still "barely turning". If I get bored, I'll ask Pray for a Stage II+ rough idle cam with 38% lobe...


I'll do some off the cuff calcs, please correct numbers if you know otherwise.
Stock SS damper is 7.48" this turns a 4.5" pulley the PIs cancel out, I get 1.662 for the two pulleys, there is an internal 4.10 ratio = total rpm ratio of 6.82
So 6900 engine RPM = 47,000 impeller... barely turning with a max rating of 62,000 RPM
At a more normal stock fuel cut of 6600 RPM = 45,000 RPM

So what is the smallest pulley you can run? Let's look at a Pray's Stage II+ cam say fuel cut at 7200 RPM
the damper of 7.48" turns a 3.65" pulley the PIs cancel, I get 2.05 for the two pulleys, there is an internal 4.10 ration = total rpm ratio of 8.40

7200 engine RPM x 8.40 ratio = 60,500 RPM impeler... getting close to the "max impeler" 62,000 RPM

I got the crank pulley size from here:
http://www.atiracing.com/products/da...ts/damserp.htm

for grins a P1x max impeller speed of 65000 rpm and a stock cam could go as small as:
the damper of 7.48" turns a 3.15" pulley the PIs cancel, I get 2.37 for the two pulleys, there is an internal 4.10 ration = total rpm ratio of 9.71
6600 engine RPM x 9.71 ratio = 64,100 RPM impeller...... don't miss shift


Clearly, we can all see that the smaller P1 with the higher RPM impeller coupled with a 3.15" pulley is going to make more boost, much quicker on engines with smaller cam or stock cam (RPM limit) in lower HP applications, probably would run a BOV that is set to pop off at a preset max boost that engine / fuel system limits.

https://www.procharger.com/p-1x-and-d-1x-superchargers