GeorgeC

I have Dynatech 1 3/4" headers with Dynatech 3" collectors on the car now, and short lengths of 3" pipe going into 2 3" in/out Flowmaster 1 chamber race mufflers. Works well, makes a lot of noise.

I'm considering a change to the Dynatech 1 3/4 - 1 7/8" stepped header, and Dynatech Quick-Tune collector mufflers (3.5"). I'm not that concerned with noise, since I rarely drive the car on the street. The collector mufflers seem like they'd be more compact, and probably weigh a little less than everything I currently have.

The theory also says that I'd lose some midrange power and gain a little upper RPM power with the stepped header/3.5" collector, which would be great in my case.

Any thoughts? I'd love a non-stepped 1 7/8" header, but the only ones I know of are QTP's, but they only have a 3" collector. Also, since it's not a slip-on collector (like Dynatech), I couldn't run a collector muffler, anyway.

The Derek H

I have the dynatech's with 3.5" collectors. My exhaust was finished today. I have little room to work with my torque arm crossmember welded in. I'm using dual 3.5 reduced to 3" pipe into a Flowmaster collecor with a 4" exit into a bullet and turndown. Its not real heavy or restrictive. Plus I can just pull it off in two pieces at the truck. The muffler band clamps onto the y just behind the torque arm crossmember and the y-pipe is super short so its no big deal to take it out. I think the collector mufflers would be great in your case. I really thought about it. They shouldn't be any louder than bullets. Let me know how it turns out. I rarely drive on the street either but would love to save some weight. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

1CAMWNDR

iTrader: (21)

Hmmm. Might work well for you George. I also think you'd get a little more high rpm power with the bigger set-up.
Too bad you are doing this now; I'd love to buy your current set-up, but no funds <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" /> and a baby on the way <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> .
Good luck.

Fenris Ulf

I really doubt 3.5" collectors have any advantage in this case. Get some of the 1 7/8 grots and dont mess with collector reducers or any of that.

John B

iTrader: (10)

I'd add the 3.5" merge collectors while you are at it. I absolutely love my exhaust set-up and it has plenty of torque through-out the entire RPM band with a dinky B1 cam. Heck, I am putting out 350 RWTQ at a lowly 3100 RPM and 400 RWTQ at 4800 RPM so I can't see where I'm losing any torque with stepped headers of course mine are true equal length tubes so it may not be a fair comparison!

If you are losing mid-RPM power then your exhaust system isn't set-up correctly....this is the whole point behind a stepped header <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

justin sutton

Kinda off subject but has anyone heard of or ran any of the new dynatech race mufflers? I want to get rid of the bullets and shoot for something new.I just kind of hate to be a guinea pig since they cost $90.00 each.

GeorgeC

This is nothing I'm doing right away, I'm just tossing around some ideas...

The merge collectors are a no-go, since I'll be running a collector muffler, which basicly incorporates the collector and the muffler into one piece. The smallest Dynatech Quick-Tune collector mufflers are 3.5", and for 1 7/8" tubes (hence the need to switch headers, since mine are 1 3/4").

The Grotts/QTP's are still an option, but I personally like the slip-on collector on the Dynatechs (a feature that most people don't like). <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

John B: you've got me tempted to try and build my own headers so I can make them like I want them. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> Where did you get the flanges/starter tubes?

<small>[ October 31, 2002, 06:55 AM: Message edited by: GeorgeC ]</small>

RAGEman

iTrader: (4)

George, I'm going to be trying the following setup here shortly:

*Dynatech 1-3/4" - 1-7/8" headers
*Dynatech 1-7/8" - 3" high-velocity merge collectors
*3" X-pipe (if justin sutton would hurry up and ship it to me!!!! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> )
*Two 12" x 3" Dynomax bullets
*Two turndowns

I'll let everyone know how it turns out.

The Derek H

Just so you know the Grotyohann replica's Barry at Quicktime is making have slip fit collectors not the ball flanges like the Grots of the past.

Also call Thunder Racing they are building custom spec headers. I think they take 4 weeks or so to make but you can pick the primary tube size the collector and etc. These are also based on the Grotyohann design but you get to choose what goes into it. You could pick the primary tube and any brand collector muffler you wanted on this setup.

Also from what I've researched most manufacturers only make the collector mufflers for 2" or larger primaries but a few like Dynatech do make them in 1.875 (1 7/8).

GeorgeC

I understand that the QTP collectors are a slip-fit. What I'm referring to is the separate collector on the Dynatech, which slips over the individual header tubes. The type of collector muffler I want to use is shown here. They do make one that just slips onto the collector itself though. Maybe the QTP's would be the way to go.

Like I said, I'm just kicking around ideas right now.

Ian

George, I could have sworn people posted in another thread that Dynatech also makes a full 1 7/8" header (check sponsor's). I'll try to find the post for you.

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 RAGEman:
<strong>George, I'm going to be trying the following setup here shortly:

*Dynatech 1-3/4" - 1-7/8" headers
*Dynatech 1-7/8" - 3" high-velocity merge collectors
*3" X-pipe (if justin sutton would hurry up and ship it to me!!!! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> )
*Two 12" x 3" Dynomax bullets
*Two turndowns

I'll let everyone know how it turns out.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That setup has already been on a heads cam car. Grots with a y-pipe made more power.

RAGEman

iTrader: (4)

</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 RAGEman:
<strong>George, I'm going to be trying the following setup here shortly:

*Dynatech 1-3/4" - 1-7/8" headers
*Dynatech 1-7/8" - 3" high-velocity merge collectors
*3" X-pipe (if justin sutton would hurry up and ship it to me!!!! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> )
*Two 12" x 3" Dynomax bullets
*Two turndowns

I'll let everyone know how it turns out.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That setup has already been on a heads cam car. Grots with a y-pipe made more power.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Which car and were they the exact same parts? My car has been on the dyno and made 3 consecutive pulls and produced a variance of 7 RWHP with absolutely nothing changed, so I'm not real worried about it. The setup will make power, and will sound awesome, and I found great deals on all the parts.

RAGEman

iTrader: (4)

Besides, peak horsepower is not my #1 concern.

justin sutton

Alan I was wondering what do you think of the dynatech's? I was going to go with them or the hookers.Your xpipe is on the way with a little extra in the box for the wait.

Lane

iTrader: (1)

A true dual X system will give you more power across the power band over any Y-pipe set-up IMHO. I've NEVER seen a Y-pipe system outpull one of our true dual systems. Especially in the lower rpm range - like 5000-5500.

justin sutton

Lane is right the xpipe is the only way to go.

1CAMWNDR

iTrader: (21)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Lane:
<strong>A true dual X system will give you more power across the power band over any Y-pipe set-up IMHO. I've NEVER seen a Y-pipe system outpull one of our true dual systems. Especially in the lower rpm range - like 5000-5500.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">George doesn't have a Y-pipe. Just Dynatech headers with short pieces of tubing and a pair of Flowmaster 10-Series DeltaForce mufflers.

Also GeorgeC; do you think this will make a big enough change that you'd need to change cams?? (I almost think you have a nice enough exhaust NOW to use a singe pattern; or reverse split pattern cam.....You are not running N2O are you?)
<img border="0" alt="[Firebird]" title="" src="graemlins/formula.gif" />

RAGEman

iTrader: (4)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by justin sutton:
<strong>Alan I was wondering what do you think of the dynatech's? I was going to go with them or the hookers.Your xpipe is on the way with a little extra in the box for the wait.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I appreciate it, sir. I don't exactly have the Dynatechs on the car yet, but once I do, I'll be sure to let you know, pal.

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 RAGEman:
<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 RAGEman:
<strong>George, I'm going to be trying the following setup here shortly:

*Dynatech 1-3/4" - 1-7/8" headers
*Dynatech 1-7/8" - 3" high-velocity merge collectors
*3" X-pipe (if justin sutton would hurry up and ship it to me!!!! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> )
*Two 12" x 3" Dynomax bullets
*Two turndowns

I'll let everyone know how it turns out.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That setup has already been on a heads cam car. Grots with a y-pipe made more power.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Which car and were they the exact same parts? My car has been on the dyno and made 3 consecutive pulls and produced a variance of 7 RWHP with absolutely nothing changed, so I'm not real worried about it. The setup will make power, and will sound awesome, and I found great deals on all the parts.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">TrahnZam WS6's car, http://www.speeddemonmotorsports.com...nick_gette.htm