Fenris Ulf

Flow at what? Are you trying to compare muffler flow to straight pipe flow?

Phil99vette

iTrader: (11)

I am trying to figure out what size exhaust pipes I need for my new setup. Using the standard calculation of horsepower x 2.2 = scfm, leads me to believe that the pipes need to flow 1200cfm.
Phillip

Fenris Ulf

How much power are you going to be making? Dual 3" will flow more than enough, but dual 2.5" or a single 3" will suffice for most heads cam cars.

Phil99vette

iTrader: (11)

Last time I dynoed the car it made 431/401, swapped out cams, changed a few things so I think it should be 440-460rwhp now. On the bottle add 125rwhp to that so close to 600rwhp on nitrous. Is 2 - 2.5" pipes sufficient for a 440rwhp H & C car? Everyone I am talking to outside of the ls1 market is saying I need a dual 3" for that horsepower vs cid.
Phillip

Fenris Ulf

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by phil97svt:
<strong> Last time I dynoed the car it made 431/401, swapped out cams, changed a few things so I think it should be 440-460rwhp now. On the bottle add 125rwhp to that so close to 600rwhp on nitrous. Is 2 - 2.5" pipes sufficient for a 440rwhp H & C car? Everyone I am talking to outside of the ls1 market is saying I need a dual 3" for that horsepower vs cid.
Phillip </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">460 might be a little lofty for a cam swap, but going to dual 3" couldn't hurt. Especially on the gas...

Phil99vette

iTrader: (11)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Fenris Ulf:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by phil97svt:
<strong> Phillip </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">460 might be a little lofty for a cam swap, but going to dual 3" couldn't hurt. Especially on the gas... </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I agree, but who said I only changed the Cam? <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" />
Phillip
Changes***
-Changed 230/230 114lsa cam to a 110lsa cam
-added 3 degrees of timing
-richened the car up from 13.9 to 12.9
-Changed to Foam filter and new intake system(vararam) with radiused inlet
-Removed mangaflow 2.5" X pipe and went to 3" Dr. Gas right after headers help scavenging
-balanced clutch to remove nasty vibration
-ported TB

TreeGreenZ

I am wondering the same thing for my car. I think I am going to go with 2 2 3/4 pipes into 3.....I am just doing a heads/cam...solid roller though.

Phil did you ever go to MIR....I was wondering how that track is.

Phil99vette

iTrader: (11)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by TreeGreenZ:
<strong> I am wondering the same thing for my car. I think I am going to go with 2 2 3/4 pipes into 3.....I am just doing a heads/cam...solid roller though.

Phil did you ever go to MIR....I was wondering how that track is. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I am always @ MIR...pretty good track.
Phillip

Fenris Ulf

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by phil97svt:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Fenris Ulf:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by phil97svt:
<strong> Phillip </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">460 might be a little lofty for a cam swap, but going to dual 3" couldn't hurt. Especially on the gas... </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I agree, but who said I only changed the Cam? <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" />
Phillip
Changes***
-Changed 230/230 114lsa cam to a 110lsa cam
-added 3 degrees of timing
-richened the car up from 13.9 to 12.9
-Changed to Foam filter and new intake system(vararam) with radiused inlet
-Removed mangaflow 2.5" X pipe and went to 3" Dr. Gas right after headers help scavenging
-balanced clutch to remove nasty vibration
-ported TB </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Time will tell...good luck!

Phil99vette

iTrader: (11)

CFM?
Phillip