turbo/supercharger pressures?

[idunit]

Ok, turbos are measured in lbs of boost and superchargers are measured in psi so whats the conversion of lbs of boost to psi?  Basically I'm wondering if I were to build my engine to handle 20lbs of boost how big of a superchager could I run instead?

[LanceS13]

To convert 20lb. of boost to psi, mutliply it by 12.5, then subtract 50.  Now divide it by 10.  So....20lb. of boost equals 20 psi.

<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'> j/k
psi=pounds per scare inch=lb. of boost

[ca18guy]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from LanceS13 on 1<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wow.gif" border="0" valign="absmiddle" alt=':0'>7 pm on Jan. 10, 2002
To convert 20lb. of boost to psi, mutliply it by 12.5, then subtract 50. Now divide it by 10. So....20lb. of boost equals 20 psi.

<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'> j/k
psi=pounds per scare inch=lb. of boost</td></tr></table><span id='postcolor'>

Man Lance, I got half way through your thread and was ready to beat you over the head <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'> I knew you were'nt that dumb <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt=':p'>

[Kid Zelda]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from LanceS13 on 1<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wow.gif" border="0" valign="absmiddle" alt=':0'>7 pm on Jan. 10, 2002
To convert 20lb. of boost to psi, mutliply it by 12.5, then subtract 50. Now divide it by 10. So....20lb. of boost equals 20 psi.

<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'> j/k
psi=pounds per scare inch=lb. of boost
</td></tr></table><span id='postcolor'>
That wasn't your first reply...... hehe. I know <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[LanceS13]

you got me Kid <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>
it was too easy to go back and be a smartass.

[idunit]

So then why do most superchargers only run like 7-9psi? &nbsp;Would it possible to find or even modify one to produce 20 or so?

[Nismos14]

you wouldnt need to modify one to run more, its just that people like to keep there cars and engines alive so they dont run outrageous boost on the supercharger... u just have to find one thats capable of handling whatever boost pressure u want to apply

[ca18guy]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from idunit on 7:40 am on Jan. 11, 2002
So then why do most superchargers only run like 7-9psi? Would it possible to find or even modify one to produce 20 or so?
</td></tr></table><span id='postcolor'>

You can run em' at any PSI you want (they just might not be effective) You would need to buy a new pulley to run whatever PSI u want.

[idunit]

So I can just get a sc and put whatever size pulley on to achieve as much boost as I want. &nbsp;Is there any way to use something like a variable boost controller like they have for turbo's where you can just push a button and turn the boost up or down? &nbsp;I love turbo but hate the lag.