How much HP 2.5 exhaust? - Page 7 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Bo White · 11-06-2013, 07:57 PM

Second pull overplayed over best pull from last visit:

Bo White · 11-06-2013, 07:59 PM

Quote:

Originally Posted by grocerygetter

you know this is all selfish of me, right? Trying to justify the cost of a header/dual 3" set up gamble.

Looking back I was a little aggregated on my post. I had just got the text about me picking the kids up lol. I'll have some more info tomorrow.

Iam Broke · 11-06-2013, 08:24 PM

Glad you saw some gains from it. I think i'll pulley down to 3.2" instead though. The drone on mine with a full 3" was just too unbearable.

BlaqWhole · 11-06-2013, 09:02 PM

Bo, what blower do you have again?!

axis · 11-06-2013, 09:14 PM

Quote:

Originally Posted by Bo White

Second pull overplayed over best pull from last visit:

That is what I expected from a bigger exhaust, at your HP level. The gap widens as the rpm's increase.

Did you happen to log boost? Wondering if you lost any. I wouldn't expect you to lose much if any but thought i'd ask. Very nice numbers man.

Quote:

Originally Posted by Iam Broke

Glad you saw some gains from it. I think i'll pulley down to 3.2" instead though. The drone on mine with a full 3" was just too unbearable.

Do you still have your 3in exhaust? If so, a set of J-pipes would take care of that drone for you.

BlaqWhole · 11-06-2013, 09:22 PM

Oh, and Bo, did you ever modify that OBX exhaust to be a full 3 inches? Or does it still have that 2.5 downsize at the connection of the cat-back?

Bo White · 11-06-2013, 09:58 PM

I lost 1/2lb or so from last time. I have the ECS Paxton 1500 kit. The exhaust still necks down to 2.5 at were the cats were.

BlaqWhole · 11-06-2013, 10:14 PM

Ah, you have a centri blower. That's what I'm looking to do after some ported heads and a mild cam. Can't wait. Maybe by next Summer!

grocerygetter · 11-06-2013, 11:28 PM

Darn it. Freaking results.

Bo White · 11-06-2013, 11:37 PM

Well just remember that's a lot of power going through a 2.5 cat back. A bolt on car will show differently for sure.

SixGracing · 11-07-2013, 12:56 AM

When I first bought my car new, I added the SLP Long tubes and a full 3" Exhaust and my car dyno'd right at 30HP more than stock without at tune. So the headers or the exhaust or the combination of the two did something. This was put on an otherwise completely stock setup. Although having the AFM deleted couldn't happen soon enough. The noises coming from exhaust caused by the AFM engaging was barely tolerable. Farting, burping, coughing, droning. Terrible. After we did the LS3 conversion, it turned into music.

grocerygetter · 11-07-2013, 07:20 AM

Nah...under 600 horse I'd bet there is no difference with diameter...don't read more into this discussion than it is. It has got side tracked a bit to cars around 600. Bo and I fall into that category. SixG...u do too on the bottle.

BlaqWhole · 11-07-2013, 07:40 AM

Quote:

Originally Posted by grocerygetter

Nah...under 600 horse I'd bet there is no difference with diameter...don't read more into this discussion than it is. It has got side tracked a bit to cars around 600. Bo and I fall into that category. SixG...u do too on the bottle.

I'm not gonna get into any debate over this. But I will express that I disagree. I feel that a 3 inch exhaust even on a NA vehicle will have some gains over the stock 2.5 inch. Maybe not soo much over an aftermarket 2.5 inch. I side-tracked this thread when I said that people keep saying there are no gains to be had despite there being a lack of evidence to prove such a statement. Nobody has dyno tested a car after a 2.5 inch to 3 inch exhaust swap even tho an exhaust change on this car is easy peasy...yet somehow this rumor (or straight up lie) keeps getting repeated. But, until we get a legit answer...

grocerygetter · 11-07-2013, 01:36 PM

I will say my car rev'd faster it seemed after I went to aftermarket 2.5 (what I have now).

11-06-2013, 07:57 PM	#85
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,091	Second pull overplayed over best pull from last visit: Attached Images __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter, stage 4 cam and Wilkes 11° 65cc heads 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

11-06-2013, 08:24 PM	#87
Iam Broke PHAT B33 Drives: 2012 TF3 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: Dark of the Moon Posts: 1,460 View My Garage	Glad you saw some gains from it. I think i'll pulley down to 3.2" instead though. The drone on mine with a full 3" was just too unbearable. __________________ Another 1 of 371 '12 T3 LS3 M6's built.

11-06-2013, 09:58 PM	#91
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,091	I lost 1/2lb or so from last time. I have the ECS Paxton 1500 kit. The exhaust still necks down to 2.5 at were the cats were. __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter, stage 4 cam and Wilkes 11° 65cc heads 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

11-06-2013, 11:28 PM	#93
grocerygetter instigator Drives: 2020 6.2 Trail Boss, 2022 XC90 Join Date: Jan 2010 Location: 72034 Posts: 3,979 View My Garage	Darn it. Freaking results. __________________ -John S.

11-06-2013, 11:37 PM	#94
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,091	Well just remember that's a lot of power going through a 2.5 cat back. A bolt on car will show differently for sure. __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter, stage 4 cam and Wilkes 11° 65cc heads 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

11-06-2013, 09:02 PM	#88
BlaqWhole Account Suspended Drives: 2017 Camaro ZL1 A10 Join Date: May 2012 Location: NJ Posts: 7,692	Bo, what blower do you have again?!

11-06-2013, 09:22 PM	#90
BlaqWhole Account Suspended Drives: 2017 Camaro ZL1 A10 Join Date: May 2012 Location: NJ Posts: 7,692	Oh, and Bo, did you ever modify that OBX exhaust to be a full 3 inches? Or does it still have that 2.5 downsize at the connection of the cat-back?

11-06-2013, 10:14 PM	#92
BlaqWhole Account Suspended Drives: 2017 Camaro ZL1 A10 Join Date: May 2012 Location: NJ Posts: 7,692	Ah, you have a centri blower. That's what I'm looking to do after some ported heads and a mild cam. Can't wait. Maybe by next Summer!

11-07-2013, 12:56 AM	#95
SixGracing Drives: 2010 2SS/RS LS3 A6 Join Date: Mar 2011 Location: West Haven, UT Posts: 790	When I first bought my car new, I added the SLP Long tubes and a full 3" Exhaust and my car dyno'd right at 30HP more than stock without at tune. So the headers or the exhaust or the combination of the two did something. This was put on an otherwise completely stock setup. Although having the AFM deleted couldn't happen soon enough. The noises coming from exhaust caused by the AFM engaging was barely tolerable. Farting, burping, coughing, droning. Terrible. After we did the LS3 conversion, it turned into music. __________________

11-07-2013, 07:20 AM	#96
grocerygetter instigator Drives: 2020 6.2 Trail Boss, 2022 XC90 Join Date: Jan 2010 Location: 72034 Posts: 3,979 View My Garage	Nah...under 600 horse I'd bet there is no difference with diameter...don't read more into this discussion than it is. It has got side tracked a bit to cars around 600. Bo and I fall into that category. SixG...u do too on the bottle. __________________ -John S.

11-07-2013, 01:36 PM	#98
grocerygetter instigator Drives: 2020 6.2 Trail Boss, 2022 XC90 Join Date: Jan 2010 Location: 72034 Posts: 3,979 View My Garage	I will say my car rev'd faster it seemed after I went to aftermarket 2.5 (what I have now). __________________ -John S.