Btr stage 4 results - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

whynot · 03-28-2016, 10:15 AM

OK I am trying to see if I am in the ball park with the btr stage 4 cam.
447rwhp/429rwtq this with s/p headers with high flow cats and retro chambered exhaust. Also had 3.91 insatlled. M6. It's seems a little low to me from my research. My tuner seems to think the chambered tail section is robbing some power.

flyer08 · 03-28-2016, 10:21 AM

From other cars I've seen that sounds low. It could just be the dyno?

zz430camaro · 03-28-2016, 10:38 AM

Ya the HP seems low by about 30

whynot · 03-28-2016, 10:44 AM

No, Dino seemed to be close to expected with headers and exhaust. I think it is 30-40 Hp lower than expected

Skoonie · 03-28-2016, 10:44 AM

My BTR 3 made 480 on a Mustang dyno. Only other bolt on's were ARH LT's cat delete and CAI. It seems you should still have some more power left on the table.

Bo White · 03-28-2016, 10:47 AM

You need to see what other LS3 cars make on that dyno

whynot · 03-28-2016, 10:52 AM

He showed me some run files on a 2013 1le with a smaller cam with about 15 more hp. Hey seems to thinking it's my exhaust holding it back

Bo White · 03-28-2016, 11:01 AM

Nope. Who makes the exhaust?

whynot · 03-28-2016, 11:06 AM

Stainless works retro chambered

LSXDoc · 03-28-2016, 11:10 AM

I made 423rwhp with S/P headers, hi-flo cats, and the retro catback. Only other mods were CAI and ported TB. Numbers seem low.

Bo White · 03-28-2016, 11:11 AM

Yeah its not holding you back.

flyer08 · 03-28-2016, 01:46 PM

I have same exhaust and make 470 with automatic, tsp vvt2 cam (lot smaller) and hesd work. No reason you are so much lower than me other than tune or Dyno. I did do Dyno in Florida but elevation wouldn't make that big difference.

2010reddevil · 03-28-2016, 02:32 PM

Well the retro chambered are somewhat restrictive compared to Borla or MagnaFlow because of their design. They have a louvered core that gives them that certain sound they have. Only suggestion I can make is try their muffler delete rear section and re-dyno. If it improves, then that's your culprit.

cc-rider · 03-28-2016, 02:49 PM

I'd be really surprised if you're finding out that a cat-back exhaust is holding you back by 10 (or more) horsepower. Exhausts have been dyno'd thousands of times here on this site and I've yet to see anyone provide any conclusive evidence that any catback is better or worse than the next.

I have a hard time believing it can be that. I would look more towards the tune. Getting KR...maybe the injector timing needs to be moved around (common with cams).

Did the tuner do anything other than tune in your MAF fueling? Did he tune the VVE tables? Did he log/tune in the spark? Injector timing?

03-28-2016, 10:15 AM	#1
whynot Drives: 2010 ss, 1991 z28, Join Date: Nov 2014 Location: ohio Posts: 41	Btr stage 4 results OK I am trying to see if I am in the ball park with the btr stage 4 cam. 447rwhp/429rwtq this with s/p headers with high flow cats and retro chambered exhaust. Also had 3.91 insatlled. M6. It's seems a little low to me from my research. My tuner seems to think the chambered tail section is robbing some power. Attached Images

03-28-2016, 10:47 AM	#6
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,018	You need to see what other LS3 cars make on that dyno __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X

03-28-2016, 11:01 AM	#8
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,018	Nope. Who makes the exhaust? __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X

03-28-2016, 11:10 AM	#10
LSXDoc Drives: 2015 1SS/RS/1LE Join Date: Jun 2014 Location: Guam Posts: 135 View My Garage	I made 423rwhp with S/P headers, hi-flo cats, and the retro catback. Only other mods were CAI and ported TB. Numbers seem low. __________________ 2015 Red Hot 1SS/RS/1LE ADM LSA kit BTR Stg3 PD Cam Stainless Power LTs w/ CATs Stainless Works ZL1 Res. Delete 3" Retro Catback DST Ported ZL1 TB 619RWHP / 539LB-FT

03-28-2016, 11:11 AM	#11
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,018	Yeah its not holding you back. __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X

03-28-2016, 10:21 AM	#2
flyer08 Account Suspended Drives: 2010 2SS/RS Join Date: Jun 2009 Location: Texas Posts: 3,418	From other cars I've seen that sounds low. It could just be the dyno?

03-28-2016, 10:38 AM	#3
zz430camaro Drives: 2015 1LE Join Date: Oct 2015 Location: Cleveland, OH Posts: 1,485	Ya the HP seems low by about 30

03-28-2016, 10:44 AM	#4
whynot Drives: 2010 ss, 1991 z28, Join Date: Nov 2014 Location: ohio Posts: 41	No, Dino seemed to be close to expected with headers and exhaust. I think it is 30-40 Hp lower than expected

03-28-2016, 10:44 AM	#5
Skoonie Drives: 2010 SS M6 Join Date: Aug 2015 Location: McMinnville OR Posts: 68	My BTR 3 made 480 on a Mustang dyno. Only other bolt on's were ARH LT's cat delete and CAI. It seems you should still have some more power left on the table.

03-28-2016, 10:52 AM	#7
whynot Drives: 2010 ss, 1991 z28, Join Date: Nov 2014 Location: ohio Posts: 41	He showed me some run files on a 2013 1le with a smaller cam with about 15 more hp. Hey seems to thinking it's my exhaust holding it back

03-28-2016, 11:06 AM	#9
whynot Drives: 2010 ss, 1991 z28, Join Date: Nov 2014 Location: ohio Posts: 41	Stainless works retro chambered

03-28-2016, 01:46 PM	#12
flyer08 Account Suspended Drives: 2010 2SS/RS Join Date: Jun 2009 Location: Texas Posts: 3,418	I have same exhaust and make 470 with automatic, tsp vvt2 cam (lot smaller) and hesd work. No reason you are so much lower than me other than tune or Dyno. I did do Dyno in Florida but elevation wouldn't make that big difference.

03-28-2016, 02:32 PM	#13
2010reddevil Drives: 2010 Camaro 2SS Victory Red 6M Join Date: Apr 2015 Location: Gulf Coast, TX Posts: 1,424	Well the retro chambered are somewhat restrictive compared to Borla or MagnaFlow because of their design. They have a louvered core that gives them that certain sound they have. Only suggestion I can make is try their muffler delete rear section and re-dyno. If it improves, then that's your culprit. __________________ 2011 2SS 6A Red Jewel Metallic, Vararam Tune CAI, Magnaflow 3" Competition c/b, Speed Engineering 1-7/8 LT's, Circle D 5C, M/T 275/40R20 S/S, HPTuners tune by Ryan@GPI 12.3 @ 112 ACM as of 12/22/19 Gone on 12/28/19 R I P 2010 2SS 6M Victory Red/Black (old ride) CAI intake, Speed Engineering 1 7/8" LT's, X4 base tune, Flowmaster Outlaw axle-back. 12.6 @ 115 SAR as of 9/19/15 Gone but never forgotten.

03-28-2016, 02:49 PM	#14
cc-rider Drives: 2010 Camaro SS Join Date: Dec 2006 Location: MN Posts: 1,171	I'd be really surprised if you're finding out that a cat-back exhaust is holding you back by 10 (or more) horsepower. Exhausts have been dyno'd thousands of times here on this site and I've yet to see anyone provide any conclusive evidence that any catback is better or worse than the next. I have a hard time believing it can be that. I would look more towards the tune. Getting KR...maybe the injector timing needs to be moved around (common with cams). Did the tuner do anything other than tune in your MAF fueling? Did he tune the VVE tables? Did he log/tune in the spark? Injector timing?