damn that sucks, i was gonna go ahead and take off the cats and get the muffler put on but i got there too late <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> have to wait till next week or the week after now

 

Big J, the mufflers you have on your truck, HYDE did some flow bench testing with. To make a long story short, they flowed more then any other muffler and even a piece of straight 2.5" pipe at 29" of water. Good scavenging mufflers there. They are quiet though. Sleeper setup. I should have my 2.5" duals with 1 chamber delta force flowmasters and full, hidden tail pipes by the July 14th track meet. Hopefully anyway. Damn these trucks are expensive! lol <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

<small>[ July 03, 2002, 09:35 PM: Message edited by: Vortech5300 ]</small>

 

I got the update, but I think it is the same as you and I were already using. I will check it out. I think it is 1.05

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">they flowed more then any other muffler and even a piece of straight 2.5" pipe at 29" of water. Good scavenging mufflers there.</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I'm going to need some clarification on this one.
You say this was on a flow bench @ 29" and what size bore length was the exit pipe that was used?
I'm not sure that a 2.5" straight pipe can be out flowed by a 2.5" inlet/outlet muffler of any kind, even in theory. A muffler, regardless of design, uses harmonics to tune out resonant frequencies. Noise cancelation is what is used to do this..."tuned" frequencies are created by baffles, chambers, perferations and packing material to create waveforms inverse to that of "resonance frequency" which reduces noise or sound (waveform amplitude) but this process creates turbulance. As such you will be decreasing laminar flow which in turn means you are creating a restriction.

While a muffler may infact help scavanging by intruducing a larger chamber for gasses to quickly expand (similar to motorcyle expansion chamber tech) thus aiding in "flow" they also have to decrease this expanding gas back to the size of the exit pipe which means slowing down the gas or changing is vector. Both of these WILL cause further restriction.

Ultimately if what HYDE tested was in fact true you would see NHRA Top Fuel Dragsters with mufflers on the end of "Zoomies" would you not? Or how about NASCARS with mufflers behind their custom fabricated headers/collectors/x-pipes? Both racers/crews go to exhausting lengths to test and maximize EVERY hp available and the net result is no muffler (straight pipe) IS going to outflow any muffler.

I'm not saying you didn't see what you say but flow benches good for reference but can be manipulted or in correctly used in such a fashion to get erronious data.

Richard

 

hey richard, the version i got was 1.05B only reason i want 1.05 is because the beat version didnt have the last tab for select row or whatever, so it made it pretty much impossible to change shift firmness <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

 

I NEED to know more about this one...