3" Exhaust, Stock Tunnel Brace and Knock Sensors..... Lesson Learned. - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

*GTAHVIT* · 09-09-2010, 04:31 PM

Quote:

Originally Posted by CamaroSpike23

mostly

you never asked either....

BTW GTA, congrats on getting it figured out.

you never called me back with the results from the "testing"

told you it was the exhaust....

2010 4 DW · 09-09-2010, 05:32 PM

This has been going on for years.

I see dumb asses put cutouts up front on new vehicles, and little do they know that the knock sensors are picking this up and decreasing timing. = HP

This is why we used to put the cutout in the rear before the muffler on the F-Bodies.

DW

jsharp · 09-09-2010, 07:17 PM

I must be a dumb ass I have noweeds cutouts right after headers. I had tunnel brace bounce but have fixed it now but I didnt know that the cutouts would cause issue. So it does good on the dyno but once you hit the streets your loosing power. Would be nice for some performance shops to chyme in on this thread!

HJ's Garage · 09-09-2010, 07:17 PM

Like could this be costing me 2 to 3 tenths at 60 feet and almost a second in the 1/8 Mile?

jsharp · 09-09-2010, 07:19 PM

Maybe this is the reason peeps with cutouts feel like the car is slower on the street with them on; when the dyno says other wise?

jsharp · 09-09-2010, 07:20 PM

Will knock retard/timing pull show up on any guages other than directly plugging into ecm?

*TAG UR IT* · 09-09-2010, 11:54 PM

HA!

Man, that was one thing that pissed me off more than anything else!!! That damn tunnel brace!

I have an extra set of chambered mufflers. I have switched them out a couple times in the past and most recently put them back on for the road track out in San Marcos (don't want to piss off the neighbors next to the track with the louder mufflers). I now have the 2 1/2" mufflers back on....but...all that back and forth and my pipes started to sag. They weren't in the same place that Stainless put them in a year ago. So...here comes the rattle. Well, my dumbass says, "I can fix this myself." I screwed with if for a good 30 minutes finally getting it where I wanted it. Took it for a drive ..... RATTLE....sh!t.... I repositioned everything after using a floor jack to help hold the pipes where I wanted them. well, that did the trick.

...till the next time I switched them out....

and then i almost bought that $99 tunnel brace when I saw someone post about the washers. Ok, I thought...I'll give it a shot. Home Depot, bought washers (3 for each), ran home and put them on, and BAM!!! I have TONS of space!

I wonder if the occasional knock was causing issues on my car??

Nice numbers btw. One of these days...

Blade · 09-10-2010, 07:45 AM

Its hillarious but I remember talking to this one shop in Charlotte, and they wanted to fit their 3" behemoth of a V8 exhaust onto my V6. And I was just imaging the fitting issues I would have when they were pushing that to me, lol. Needless to say, I went did my own research and didn't put it on because I wanted the right sized exhaust.

But as I stated before, I had that issue for a day with my 2.5" pipes. But I knew about the knock sensors thing, because my cousin was talking about it once. Funny how much I learn from that guy.

Scott@Bjorn3D · 09-10-2010, 09:23 AM

I told him his tunnel brace was banging at Fest when Spike took it for a spin I heard it.

*GTAHVIT* · 09-10-2010, 11:41 AM

Quote:

Originally Posted by Scott@Bjorn3D

I told him his tunnel brace was banging at Fest when Spike took it for a spin I heard it.

I'm pretty sure I covered that in the OP

*GTAHVIT* · 09-10-2010, 11:42 AM

Quote:

Originally Posted by jsharp

Will knock retard/timing pull show up on any guages other than directly plugging into ecm?

Mine never threw any codes.

No CEL...

*GTAHVIT* · 09-10-2010, 11:43 AM

Quote:

Originally Posted by HJ's Garage

Like could this be costing me 2 to 3 tenths at 60 feet and almost a second in the 1/8 Mile?

I couldn't tell ya, but mine was pulling almost 18 degrees of timing. you can definitely feel the difference.

Scott@Bjorn3D · 09-10-2010, 12:33 PM

Quote:

Originally Posted by GTAHVIT

I'm pretty sure I covered that in the OP

I know, just razzing you.

*CamaroSpike23* · 09-10-2010, 02:52 PM

Quote:

Originally Posted by Scott@Bjorn3D

I told him his tunnel brace was banging at Fest when Spike took it for a spin I heard it.

took it for a spin...

is putting it midly

09-09-2010, 07:17 PM	#17
jsharp NOW CAMMED & SUPERCHARGED Drives: 2010 Camaro 2SS/RS Black w/ IOM Join Date: Oct 2008 Location: Ar Posts: 2,336	I must be a dumb ass I have noweeds cutouts right after headers. I had tunnel brace bounce but have fixed it now but I didnt know that the cutouts would cause issue. So it does good on the dyno but once you hit the streets your loosing power. Would be nice for some performance shops to chyme in on this thread! __________________ Livernois Motorsports: Maggie 2300 7psi, Livernois 2C cam/L99 to LS3 Conversion, Ported TB, Rotofab w/adm race scoop, adm trans cooler,Kooks headers no cats, Kooks 3" exhaust. METCO breather. Precision 2400 Vigilante TC. Eibach Lowering Springs & Swaybars. BMR Trailing arms, BMR Rear Cradle Bushings, BMR Toe Rods, BMR Differential bushings. Vossen CV3 20's w/ 305 Mickey Thompson @25psi. Zl1 front bumper. OE Zl1 Hood and matte black insert. 556RWHP/500RWTQ L99

09-09-2010, 07:19 PM	#19
jsharp NOW CAMMED & SUPERCHARGED Drives: 2010 Camaro 2SS/RS Black w/ IOM Join Date: Oct 2008 Location: Ar Posts: 2,336	Maybe this is the reason peeps with cutouts feel like the car is slower on the street with them on; when the dyno says other wise? __________________ Livernois Motorsports: Maggie 2300 7psi, Livernois 2C cam/L99 to LS3 Conversion, Ported TB, Rotofab w/adm race scoop, adm trans cooler,Kooks headers no cats, Kooks 3" exhaust. METCO breather. Precision 2400 Vigilante TC. Eibach Lowering Springs & Swaybars. BMR Trailing arms, BMR Rear Cradle Bushings, BMR Toe Rods, BMR Differential bushings. Vossen CV3 20's w/ 305 Mickey Thompson @25psi. Zl1 front bumper. OE Zl1 Hood and matte black insert. 556RWHP/500RWTQ L99

09-09-2010, 07:20 PM	#20
jsharp NOW CAMMED & SUPERCHARGED Drives: 2010 Camaro 2SS/RS Black w/ IOM Join Date: Oct 2008 Location: Ar Posts: 2,336	Will knock retard/timing pull show up on any guages other than directly plugging into ecm? __________________ Livernois Motorsports: Maggie 2300 7psi, Livernois 2C cam/L99 to LS3 Conversion, Ported TB, Rotofab w/adm race scoop, adm trans cooler,Kooks headers no cats, Kooks 3" exhaust. METCO breather. Precision 2400 Vigilante TC. Eibach Lowering Springs & Swaybars. BMR Trailing arms, BMR Rear Cradle Bushings, BMR Toe Rods, BMR Differential bushings. Vossen CV3 20's w/ 305 Mickey Thompson @25psi. Zl1 front bumper. OE Zl1 Hood and matte black insert. 556RWHP/500RWTQ L99

09-10-2010, 07:45 AM	#22
Blade Drives: 2016 Camaro 2SS BVM Join Date: Dec 2009 Location: Charlotte Posts: 4,689 View My Garage	Its hillarious but I remember talking to this one shop in Charlotte, and they wanted to fit their 3" behemoth of a V8 exhaust onto my V6. And I was just imaging the fitting issues I would have when they were pushing that to me, lol. Needless to say, I went did my own research and didn't put it on because I wanted the right sized exhaust. But as I stated before, I had that issue for a day with my 2.5" pipes. But I knew about the knock sensors thing, because my cousin was talking about it once. Funny how much I learn from that guy. __________________ Formerly owner of: 2012 2SS/RS Build Thread - Totaled by red light runner 2010 LT/RS Build Thread - Traded in for 2012 2SS 2007 Acura TSX 1992 Oldsmobile Achieva V6 1992 Mercury Sable

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09-09-2010, 05:32 PM	#16
2010 4 DW Account Suspended Drives: White 2010 RS/SS Join Date: Dec 2009 Location: San Diego Posts: 672	This has been going on for years. I see dumb asses put cutouts up front on new vehicles, and little do they know that the knock sensors are picking this up and decreasing timing. = HP This is why we used to put the cutout in the rear before the muffler on the F-Bodies. DW

09-09-2010, 07:17 PM	#18
HJ's Garage Drives: Black on Black 2SS RS A6 Join Date: Nov 2009 Location: Henderson, NV Posts: 71 View My Garage	Like could this be costing me 2 to 3 tenths at 60 feet and almost a second in the 1/8 Mile?

09-09-2010, 11:54 PM	#21
TAG UR IT www.Camaro5store.com Drives: 2014 ZL1 #705 Join Date: Jul 2006 Location: SA, Texas Posts: 26,558 View My Garage	HA! Man, that was one thing that pissed me off more than anything else!!! That damn tunnel brace! I have an extra set of chambered mufflers. I have switched them out a couple times in the past and most recently put them back on for the road track out in San Marcos (don't want to piss off the neighbors next to the track with the louder mufflers). I now have the 2 1/2" mufflers back on....but...all that back and forth and my pipes started to sag. They weren't in the same place that Stainless put them in a year ago. So...here comes the rattle. Well, my dumbass says, "I can fix this myself." I screwed with if for a good 30 minutes finally getting it where I wanted it. Took it for a drive ..... RATTLE....sh!t.... I repositioned everything after using a floor jack to help hold the pipes where I wanted them. well, that did the trick. ...till the next time I switched them out.... and then i almost bought that $99 tunnel brace when I saw someone post about the washers. Ok, I thought...I'll give it a shot. Home Depot, bought washers (3 for each), ran home and put them on, and BAM!!! I have TONS of space! I wonder if the occasional knock was causing issues on my car?? Nice numbers btw. One of these days...

09-10-2010, 09:23 AM	#23
Scott@Bjorn3D Drives: Kami, 2013 2SS LS3 Luvin Join Date: Oct 2008 Location: Eufaula, Alabama Posts: 6,427	I told him his tunnel brace was banging at Fest when Spike took it for a spin I heard it.