Hey everyone. Anyone have any input on BD-11A running a 2.87" pulley. I'm starting boost around 3000 rpms. I would like to see boost earlier maybe starting around 2000 rpms? I'm seeing good 6 1/2 lbs. of boost max. The 2.87" pulley is supposed to be a 10 lb. pulley... Any help would be appreciated. Thanks in advance.

 

I don't think that the 2.87" will get you more than 1 1/2 psi more. I'm assumig that you are currently running a 3". A 2.5" will get closer to 9 psi.
Have a look here:

http://www.928motorsports.com/services/rebuild.html

http://www.928motorsports.com/servic...ingpulley.html

 

I have a 9 lb pulley on my Powerdyne and I only see around 6 lbs of boost. This is due to a lack of a custom tune. If my shift points were higher I would see more. Untill I upgrade the fuel system and install an intercooler I don't want to see higher than 6 lbs anyways.

 

I agree with that, fuel mods and an innercooler are a must with more boost.
You can get a used procharger air to air innercooler or a used vortech water to air innercooler and you'll be good for up to 12psi on a stock block.

a good setup is:

42# injectors
90mm MAF (stock lightning/cobra)
255lph fuel pump
tune

 

As ONELOWF stated the 928 Motor Sports impeller is the best thing that you can do to a Powerdyne supercharger. I now have more boost at 3000 rpm than the stock Powerdyne made at the shift points. I am now installing the 928 boost controller to limit my boost to 10# without sacrificing any low end.

 

Chuck,

How are you my friend? Dont mean to thread hijack but if I bought a Powerdyne whether new or used, would it be practical to buy that impeller right away?

 

I would say that the 928 impeller is a practical upgrade if you are the owner of a Powerdyne or can buy a used one at a cheap price. To buy a new Powerdyne and then replace the impeller would not be cost effective, you may as well start out with a better supercharger from the start.

 

I have a 1997 F150. I am running a 2.62 pulley from 928 motorsports and I have every mod that chucks bp has except the impeller,heat exchanger,and aftercooler and I am seeing around 10 psi of boost average at shifting points(6000rpm). 11 or 12 if its around 40 degrees or cooler. Hope this helps.

 

I appreciate all your replys. This question is for powerdynedriven. At what rpm do you start to see boost? I'm trying to figure out to start boost around 2000-2500 rpm and achieve 10# of boost without winding out the motor. Just figuring out the right combo of parts and tuning without wasting money.

 

Bring your boost in earlier without making too much at redline
Prevents over-boost, blown gaskets, and detonation
Safer for your motor.
Allright fster this is some of the options that the universable adjustable boost limiter valve from 928 motorsports item# 200146946400 on ebay has to offer. It sounds like its right down your alley. You could drop to a lower pulley size and be able to adjust when your boost comes in. I dont know how your setup is. Email me your mods and ill be able to help some more.

 

This is to you reply powerdynedriven. I have 4.6 with stock injectors, MAF, and fuel pump. I have the BD11A with a 2.87 pulley. I'm looking to try one pulley+ belt attempt to get closer to my 10# goal (without winding out the motor) , and whatever else upgrade and tune to get there. Thanks in advance.

 

In order to do that your gonna have to upgrade your fuel and air, which means bigger 42lb injecters and fuel pump plus 90mm MAF. Do you still use the FMU? If so, after making the fuel and air modifications you will have to get a custom tune in order to make it all work. Cha-Ching!!!!

 

The boost controller is nothing more than a bleed off valve. It will work to limit boost if you are say making 15 psi at the s/c and want only 10 psi to reach the engine. You have to be able to produce excess boost to start with, in order to let some escape.
Unless you have an exotic set up like chuck's, which is pushing into the 15 psi range, the device is of no value.
As mentioned, fuel upgrades and intercooling along with tuning are the place to start.

 

with 7-9 lbs of boost an intercooler is not needed really with a PD. I ran a 9lb(2.93) pulley seeing 7lbs with my 93 GT on a dead stock motor and ran a 12.77@111 from a 13.80@100 with no other mods. NO tune with FMU and stock 19lbers. I even had the sock gears in the car..just exhaust and the SC. The discharge temp is lower than other SC's for sure. BUT, I was turning 5500rpms and using a 2.93 pulley. My friend ran a 9lb pulley and then tried a 13lb and really only gained minor mph/et at the track with his Mustang. They push 850cfm I believe and by over spinning it you just pump tons of hot air and chance having the bearings let go.

The new impeller by 928 is a nice addition...it should have been like that from Powerdyne and they would have sold ALOT more kits and had less issues.

I'm not sure what the crank pulley size is though on an F150 but the Mustang was 6.87 I think or close to that.

Unless you have a REALLY efficient inter cooler/piping setup you are going to barely make back the power you are losing from the pressure drop in boost....


The air/water setup might be the best for it since you have less piping and pressure loss...I know on the ProChargers you lose 2-3lbs of boost with the intercooler and piping on a Stang...BUT they have way more than enough CFM to make up for it...

 

Ditto, unless you take your setup to Chucks bp's level.From all the years Ive been here,his is the best Powerdyne setup Ive seen.But a meth injection would be cheaper and perform the same function as a liquid to air as long as you dont run the meth/water resy dry