I been talking to a local shop about installing a supercharger in my truck they tell me with my bottom end I can only run 6 or 7 psi boost.Which means I wont feel any power till about 5500 to 6500 rpm...is that true.

 

You better go to another shop!
There about right on the 6 or 7 PSI but with a positive displacement blower,,,you will feel it as soon as you hit the throttle and be at full boost by 2000 RPMs.

With a very good safe tune you could run 10 -12 PSI on the stock block. But there is no guaranty's you wont break something or how long it will last.

Phil

 

My motor is a 2001 and im seeing 10psi on the gauge and have had no problems. Its all in the tune, you could blow it up on 6psi with a bad tune just as easy as 10 or 12psi. Get injectors, mass air and a dyno tune and have fun

 

Good to know off hand do you know of any positive displacment blowers for a 2001 5.4.Thanks

 

I like the Lightning intake assembly swap for the 99 to 03 2V 5.4!
Find a kit like this...
http://cgi.ebay.com/ebaymotors/ws/eB...246173028&rd=1
Then talk to Mike for the other parts you need.
http://www.madenterprise.com/scparts.htm
Shop around on the Lightning sites and you can find a lot of the parts used for less $$$

Phil

 

Here's one on E Bay now looks like almost everything is there

http://cgi.ebay.com/ebaymotors/_Car-...m260255566690&

 

I'm running 9psi on my 2001 5.4 with a procharger;

but yeah I wouldn't run more than 6psi with a positive displacement

 

With the 9psi on the procharger what rpms does the power kick in and did you do any kind of rebuild on the 5.4.I had hopes of doing a pro charger but was told possibly a positive displacment the best.

 

i'm still running a stock longblock, 39# injectors, 90mm SVT MAF, 255lph in tank pump and a tune.

with the stock ATI kit I would see boost at 2500ropms, I swapped out to a turboxs racing bypass valve and now I see boost instantly 2psi by 2000rpms

 

i did a harley swap, and went with a 6lb lower pulley as well. in my math, that comes up to 12lbs boost, but others argue w/me that it's only 10. last i checked, 6+6=12...

anywho, stock engine internals and whatnot, no problems in over a year.

 

I am running a 12 psi pulley on mine. Stock engine internals. Been a year now and it's still running. I see 2 psi somewhere near 2000 rpm or so but I don't look at the boost gauge that often.

Regards

Jean Marc Chartier

 

Something I found.
Effective Compression Ratio Chart

Static

Comp Boost Pressure (PSI)

Ratio (2) (4) (6) (8) (10) (12) (14) (16) (18) (20) (22) (24) (26)

6.0:1 6.8:1 7.6:1 8.4:1 9.3:1 10.1:1 10.9:1 11.7:1 12.5:1 13.3:1 14.2:1 15.0:1 15.8:1 16.6:1

6.5:1 7.4:1 8.3:1 9.2:1 10.0:1 10.9:1 11.8:1 12.7:1 13.6:1 14.5:1 15.3:1 16.2:1 17.1:1 18.0:1

7.0:1 8.0:1 8.9:1 9.9:1 10.8:1 11.8:1 12.7:1 13.7:1 14.6:1 15.6:1 16.5:1 17.5:1 18.4:1 19.4:1

7.5:1 8.5:1 9.5:1 10.6:1 11.6:1 12.6:1 13.6:1 14.6:1 15.7:1 16.7:1 17.7:1 18.7:1 19.7:1 20.8:1

8.0:1 9.1:1 10.2:1 11.3:1 12.4:1 13.4:1 14.5:1 15.6:1 16.7:1 17.8:1 18.9:1 20.0:1 21.1:1 22.1:1

8.5:1 9.7:1 10.8:1 12.0:1 13.1:1 14.3:1 15.4:1 16.6:1 17.8:1 18.9:1 20.1:1 21.2:1 22.4:1 23.5:1

9.0:1 10.2:1 11.4:1 12.7:1 13.9:1 15.1:1 16.3:1 17.6:1 18.8:1 20.0:1 21.2:1 22.5:1 23.7:1 24.9:1

9.5:1 10.8:1 12.1:1 13.4:1 14.7:1 16.0:1 17.3:1 18.5:1 19.8:1 21.1:1 22.4:1 23.7:1 25.0:1 26.3:1

10.0:1 11.4:1 12.7:1 14.1:1 15.4:1 16.8:1 18.2:1 19.5:1 20.9:1 22.2:1 23.6:1 25.0:1 26.3:1 27.7:1

10.5:1 11.9:1 13.4:1 14.8:1 16.2:1 17.6:1 19.1:1 20.5:1 21.9:1 23.4:1 24.8:1 26.2:1 27.6:1 29.1:1

11.0:1 12.5:1 14.0:1 15.5:1 17.0:1 18.5:1 20.0:1 21.5:1 23.0:1 24.5:1 26.0:1 27.5:1 29.0:1 30.5:1

The above chart shows the effective compression ratio of your engine, which combines the static compression ratio with the amount of supercharger boost.

 

Sorry been out of town..thanks for input.

 

just let us know what you decide to go with...

 

Im running 12# on a N/A Stock bottom end and not scared at all. Its all in your tunes!

Wayne