395 rwhp NA with factory manifolds, cats and catback!
#61
TECH Junkie
Join Date: Nov 2001
Location: Los Angeles
Posts: 3,604
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I did this a couple years ago, totally stock exhaust, 393rwhp. TR227/224 with GTP heads. Its nice to see somebody do it on an F-body now though..without the benifit of dual exhaust!
#62
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Originally Posted by gollum
Using the stock exhaust manifolds with RANDOM TECH cats and larger diameter Y pipe might free up some power. BASSINI also makes a larger diameter Y pipe with cats package that will fit OEM manifold. The cats are welded in the stock location with both of these kits.
That small OEM exhaust pipe welded at exit of the OEM cats looks very restrictive to me.
That small OEM exhaust pipe welded at exit of the OEM cats looks very restrictive to me.
I even spoke with one of the guys at Mufflex who stated they've tried everything (high flow cats, larger y-pipes and Flowmaster merge collectors). The result? 0-2 rwhp gain.
On this current car (the one in this thread), we tried dropping the catback looking for some extra power. We made 0 more rwhp with open exhaust vs. closed. IMO, any improvements to the exhaust need to start with the manifolds first.
__________________
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
#63
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Great post, thanks for sharing your info!
I've been running my LS1 with AFR205s and the GT2-3 cam along with stock exhaust manofolds and cats this year, and I really love the power increase. I just removed these parts since I'm trading in the C5 on a new C6, so my next motor project is in the planning stage. The one thing I don't like about my current setup is the valvetrain noise. Everything I read said that the small LPE grind would sound like stock, and it does at idle, but when the motor is running along at 1500 or 2000 rpms in the drive-thru or in a parking lot you can really hear the valvetrain. I've run it with the dual AFR springs, single Comp beehive springs, stock pushrods, and longer 7.425" Comp pushrods. The Comp spring/Comp pushrod combo is quietest, but not as quiet as stock. It bugs me enough that I'm thinking about keeping the stock cam in the new LS2, and just sticking with the AFR heads. Keep us posted on the valvetrain noise, I'd really like to know if it sounds different than stock in any situation.
I've been running my LS1 with AFR205s and the GT2-3 cam along with stock exhaust manofolds and cats this year, and I really love the power increase. I just removed these parts since I'm trading in the C5 on a new C6, so my next motor project is in the planning stage. The one thing I don't like about my current setup is the valvetrain noise. Everything I read said that the small LPE grind would sound like stock, and it does at idle, but when the motor is running along at 1500 or 2000 rpms in the drive-thru or in a parking lot you can really hear the valvetrain. I've run it with the dual AFR springs, single Comp beehive springs, stock pushrods, and longer 7.425" Comp pushrods. The Comp spring/Comp pushrod combo is quietest, but not as quiet as stock. It bugs me enough that I'm thinking about keeping the stock cam in the new LS2, and just sticking with the AFR heads. Keep us posted on the valvetrain noise, I'd really like to know if it sounds different than stock in any situation.
#65
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
There is no substitute for cubic inches other than nitrous.
The small 347 is limited because of its small size. Your combo with a 4.00" crank (383 ci) would make a lot more midrange torque.
The small 347 is limited because of its small size. Your combo with a 4.00" crank (383 ci) would make a lot more midrange torque.
Last edited by gollum; 04-29-2005 at 02:12 PM.
#67
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Originally Posted by Fandango
This looks like one hell of a package for a truck too.
Congratulations on the results. Nice to see a well executed package!
Congratulations on the results. Nice to see a well executed package!
__________________
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
#68
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Originally Posted by Tony Mamo @ AFR
Mill our logo off the front and drill it, mill it, etc. (carefully) to accept a factory freeze plug!! ![Secret2](https://ls1tech.com/forums/images/smilies/LS1Tech/secret.gif)
![Secret2](https://ls1tech.com/forums/images/smilies/LS1Tech/secret.gif)
Man AFR all the way!
#69
TECH Fanatic
iTrader: (12)
Join Date: May 2004
Location: Elgin, Illinois
Posts: 1,080
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Originally Posted by Patrick G
Thunder used the GM MLS gasket. Combustion chamber cc volume was 60cc. Pistons were not flycut. Static compression comes out to 11.0:1 and dynamic compression is 8.53:1 based on some reliable programs (thank J-Rod). This is one of the reasons why the new motor's torque is higher at every point of the dyno vs. stock. Even at 800 rpm in 6th gear, it feels stronger than stock. With higher compression, better flowing heads, and ports with higher air speed, I shouldn't be surprised the street manners are even better than stock.
Thanks
dave
#76
TECH Senior Member
iTrader: (10)
Join Date: May 2005
Location: Bossier city,LA barksdale AFB
Posts: 5,353
Likes: 0
Received 2 Likes
on
2 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
ok with these mods what do you think it should put down on a 6 speed car? longtubs & offroad y-pipe or cats I can do both, 90NW/90fast intake, slp lid, magnaflow catback and stock heads with right springs, and a tune threw HP tunners? thanx for your help
![Driving](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_driving3.gif)
#77
11 Second Club
iTrader: (3)
Join Date: Feb 2005
Location: Covington, LA
Posts: 687
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
It would drive me completely insane knowing that I had another 50rwhp tied up in my car if I were to throw on some headers/exhaust. ![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
I would have gone with a slightly bigger cam and ported LS6 heads with ported exhaust manifolds with a dyno-tune to get rid of the cam lope, but that's just me![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
Nice numbers![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
Mike
![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
I would have gone with a slightly bigger cam and ported LS6 heads with ported exhaust manifolds with a dyno-tune to get rid of the cam lope, but that's just me
![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
Nice numbers
![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
Mike
#78
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Originally Posted by Kraest
I would have gone with a slightly bigger cam and ported LS6 heads with ported exhaust manifolds with a dyno-tune to get rid of the cam lope, but that's just me ![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
__________________
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
#80
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Originally Posted by TT_Vert
from what ive heard about this cam, it shouldnt lope even w/o a tune right?
Dave
Dave