Stepped headers results
Stepped headers results Swapped out my Grott 1 3\4" stright headers for the headers I modified for GTS-SS, 1 3\4" - 1 7\8" stepped headers. He is no longer needing then with the bigger motor <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
NOTE:the results are through a 12-bolt with 4.30's,22lbs chromemoly driveshaft,stock SS wheels with drag radials. <img src="http://members.***.net/jason99ta/FMSstepped_vs_grots.jpg" alt=" - " />
NOTE:the results are through a 12-bolt with 4.30's,22lbs chromemoly driveshaft,stock SS wheels with drag radials. <img src="http://members.***.net/jason99ta/FMSstepped_vs_grots.jpg" alt=" - " />
10 Second Club
Joined: Nov 2002
Posts: 1,471
Likes: 3
From: Berkeley, California
Re: Stepped headers results I may be wrong but I suspect that not all variables except headers were held constant between these runs. How does an improved exhaust system produce such uniform results across such a broad range? I would expect any improvement to appear mostly at the upper end. On the other hand, my engine doesn't go that fast.
Re: Stepped headers results The stock LS6 intake is restricting the upper RPM power potential. Dynoed 475rwhp with the 1 3\4" headers and my prototype sheetmetal intake, made that at almost 7400 RPM.
What was nice,it dynoed an even 500rwhp uncorrected.
This motor in a stock drivetrain car would make close to 500rwhp CORRECTED <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
What was nice,it dynoed an even 500rwhp uncorrected.
This motor in a stock drivetrain car would make close to 500rwhp CORRECTED <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
TECH Fanatic
Joined: Aug 2002
Posts: 1,566
Likes: 0
From: Objects in mirror no longer matter.
Re: Stepped headers results </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by John B:
<strong> Welcome to the "stepped" header club Alan with a properly designed step! Very nice results. Are you also using a true merge collector too? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">He has a straight collector on it, unfortunately no one sells a cheap merge for our cars.
Awesome results Allan!
<strong> Welcome to the "stepped" header club Alan with a properly designed step! Very nice results. Are you also using a true merge collector too? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">He has a straight collector on it, unfortunately no one sells a cheap merge for our cars.
Awesome results Allan!
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
I can shift faster than you.
iTrader: (21)
Joined: Nov 2001
Posts: 5,133
Likes: 0
From: Baton Rouge, LA
Re: Stepped headers results Very nice #s Allan! Get the new and improved intake on there and an electric water pump and I can see close to 500rwhp through your un-dyno friendly drivetrain. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Jason
Jason
Re: Stepped headers results </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by JS:
<strong> Dyno numbers are skewed and the HP/TQ peaks are way off.....5250 rpm is where its supposed to be alan?
JS </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"><img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> OK JS , LOOK at the scaling,if will make you happy I can get Jason to rescale it for you <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
And whats wrong with my my peak torque at 5500 <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong> Dyno numbers are skewed and the HP/TQ peaks are way off.....5250 rpm is where its supposed to be alan?
JS </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif"><img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> OK JS , LOOK at the scaling,if will make you happy I can get Jason to rescale it for you <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
And whats wrong with my my peak torque at 5500 <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
TECH Fanatic
Joined: Aug 2002
Posts: 1,566
Likes: 0
From: Objects in mirror no longer matter.
Re: Stepped headers results </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by JS:
<strong> Dyno numbers are skewed and the HP/TQ peaks are way off.....5250 rpm is where its supposed to be alan?
JS </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Its called scaling <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Haha, just had to bust your chops JS, no harm intended <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong> Dyno numbers are skewed and the HP/TQ peaks are way off.....5250 rpm is where its supposed to be alan?
JS </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Its called scaling <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
Haha, just had to bust your chops JS, no harm intended <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Re: Stepped headers results U got me Fernis
Alan just wanted to hear the reason buddy.
No harm done <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
JS
Alan just wanted to hear the reason buddy.
No harm done <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
JS
Re: Stepped headers results </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by JS:
<strong> U got me Fernis
Alan just wanted to hear the reason buddy.
No harm done <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
JS </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No problem, I knew you were just curious <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong> U got me Fernis
Alan just wanted to hear the reason buddy.
No harm done <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
JS </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No problem, I knew you were just curious <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Re: Stepped headers results </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">unfortunately no one sells a cheap merge for our cars </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Not true! And I assume you mean inexpensive....not cheap! I got my merge collectors in mild stell for less than $150 for the pair and the quality is very nice!
TECH Fanatic
Joined: Aug 2002
Posts: 1,566
Likes: 0
From: Objects in mirror no longer matter.
Re: Stepped headers results </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Black Sunshine/ 00SS:
<strong> I assume this was on a 346? I'd like to know if there would be any benifit on a 393 all bore? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That was on a 346 but I believe the benefits would be even more pronounced for a larger bore motor.
<strong> I assume this was on a 346? I'd like to know if there would be any benifit on a 393 all bore? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That was on a 346 but I believe the benefits would be even more pronounced for a larger bore motor.
