Muffler Delete back pressure?? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

2SSARMY · 04-24-2010, 02:17 AM

Today at the track I couldn't break 13.9... I just got my muffler delete on the L99. I tried alternating psi to stick I tried everything.

Two weeks ago I was running 13.5~

You guys think this is due to my muffler deletes?? Someone mentioned back pressure problems with taking out those huge mufflers...

I'm going after market anyway now, but I'm just wondering if this is why I am running such nasty times, or is it just me not being able to stick....?

Brownhornitt · 04-24-2010, 02:22 AM

I had a muffler cutout/delete with my 1992 Firebird Formula 5.7. It dropped my 0-60 about a half a second. So that sounds about right. Go muffler if you want the best track results. Go delete if you just want to be loud and awesome.

Ronn · 04-24-2010, 02:55 AM

I'd look at the temps and track before I pointed the finger at the mufflers. Try not to eat as much next time.. that should shave off a bit

2SSARMY · 04-24-2010, 03:21 AM

Quote:

Originally Posted by Ronn

I'd look at the temps and track before I pointed the finger at the mufflers. Try not to eat as much next time.. that should shave off a bit

Track was a little bad, lots of people were having trouble sticking......

I checked the temps very often. I usually let it sit 30mins between runs and would blast the heater to get the coolant temp down. I was running with a coolant temp of 203-207F. I even took my ruck out of my car and put it in my friends car!

Tried different PSI. Tried everything. I just couldn't hook.... I was spinning horribly compared to previous weeks... I'll go out there tomorrow and try it!

sooneRS · 04-24-2010, 07:43 AM

do you go to thundervalley?

Ronn · 04-24-2010, 01:14 PM

Seeing as how you weren't the only one, I place my bet on track prep.

zen · 04-24-2010, 02:54 PM

There is a trade off between HP and Torque when you change the exhaust back pressure.

Sax1031 · 04-24-2010, 04:07 PM

What were your 60fts on the slower times compared to two weeks ago when you were running 13.5s?

Was their a mph difference that was significant between the two?

longbeachss2010 · 04-24-2010, 04:48 PM

it may be the mufflers deleted cause i got mines done. and loss 2 mpg of my car now i have 16mpg than stock with 19 mpg

lynnsblack2ss · 04-24-2010, 04:53 PM

Quote:

Originally Posted by 2SSARMY

Today at the track I couldn't break 13.9... I just got my muffler delete on the L99. I tried alternating psi to stick I tried everything.

Two weeks ago I was running 13.5~

You guys think this is due to my muffler deletes?? Someone mentioned back pressure problems with taking out those huge mufflers...

I'm going after market anyway now, but I'm just wondering if this is why I am running such nasty times, or is it just me not being able to stick....?

My husband and i took ours off before going to camsro fest, we were the twins with the black with orange stripes, i have the automatic and he has stick, i ran a consist 13.5 all day and he couldnt get better than a 13.8, i ran him 3 for 3 and beat him evertime, i didnt lose a race, we love them off and the sound, they were holding water and weigh to much!

lynnsblack2ss · 04-24-2010, 04:57 PM

Quote:

Originally Posted by 2SSARMY

Track was a little bad, lots of people were having trouble sticking......

I checked the temps very often. I usually let it sit 30mins between runs and would blast the heater to get the coolant temp down. I was running with a coolant temp of 203-207F. I even took my ruck out of my car and put it in my friends car!

Tried different PSI. Tried everything. I just couldn't hook.... I was spinning horribly compared to previous weeks... I'll go out there tomorrow and try it!

husband said same thing about his stick, he had to let cool down as well and he said he was having a bad day and i was having a good one not true, the back end of automatic have more torque even though they have a little less horsepoower, and yes sticks were having more problems now he wants to race me our home town at the track and still isnt going to matter!!

rjcamaro · 04-24-2010, 06:09 PM

Had a '90 ZR-1 put on 3" exhaust on cat back and noticed she lack punch, even without racing I could tell I lost some HP.

Spoke to a tuner said 3" was to much, went down to 2 3/4" exhaust and all the power came back and then some.

Remember like I always said with every action there is a reaction. Sometimes good sometimes not so good.....

THE EVIL TW1N · 04-24-2010, 07:59 PM

more importantly what were the MPH's? what were the MPH's of the other cars? i usually use LS1's or LT1's as a gauge. If i see almost stock LS1's trapping 105-107mph (LT1's 98-100) then i know itll be a decent day at least. But ive been to the track when LS1's would be consistently in the 99-102mph range (95-96mph-ish LT1s) when the weather was seemingly pretty good (track is at sea level and DA was OK), so go figure. If youre running slow and others are running slow then thats usually just the nature of the beast but if youre the only one not really in line then maybe it is your car......I dont think the muffler delete hurt power though, especially if you have your stock sized pipes. My friend deleted the muffler on his LT1 slowmaro

way back when and that thing ran way better like that. and actually wasnt even THAT loud, sounded decent.

Napper · 04-25-2010, 10:50 AM

It shouldn't matter on a s/c car.....turbo cars resond very well. NA car alway lose power with little to no backpressure

04-24-2010, 02:17 AM	#1
2SSARMY Account Suspended Drives: 2SS/RS Join Date: Mar 2010 Location: Norman, OK Posts: 1,125	Muffler Delete back pressure?? Today at the track I couldn't break 13.9... I just got my muffler delete on the L99. I tried alternating psi to stick I tried everything. Two weeks ago I was running 13.5~ You guys think this is due to my muffler deletes?? Someone mentioned back pressure problems with taking out those huge mufflers... I'm going after market anyway now, but I'm just wondering if this is why I am running such nasty times, or is it just me not being able to stick....?

04-24-2010, 02:22 AM	#2
Brownhornitt Drives: 2006 White Corvette Convertible Join Date: Feb 2010 Location: San Jose, CA Posts: 948 View My Garage	I had a muffler cutout/delete with my 1992 Firebird Formula 5.7. It dropped my 0-60 about a half a second. So that sounds about right. Go muffler if you want the best track results. Go delete if you just want to be loud and awesome. __________________ The Corvette is an animal.

04-24-2010, 02:55 AM	#3
Ronn Drives: 2010 Camaro Join Date: Mar 2010 Location: Northern Ontario Posts: 1,181	I'd look at the temps and track before I pointed the finger at the mufflers. Try not to eat as much next time.. that should shave off a bit __________________ 1SS / RS / M6 / IOM / Black rally stripes / Polished wheels It's a high school prom, it's a Springsteen song, it's a ride in a Chevrolet...

04-24-2010, 07:43 AM	#5
sooneRS Drives: Black Join Date: Jun 2009 Location: Oklahoma City Posts: 181	do you go to thundervalley? __________________ Order# NKFJ16

04-24-2010, 01:14 PM	#6
Ronn Drives: 2010 Camaro Join Date: Mar 2010 Location: Northern Ontario Posts: 1,181	Seeing as how you weren't the only one, I place my bet on track prep. __________________ 1SS / RS / M6 / IOM / Black rally stripes / Polished wheels It's a high school prom, it's a Springsteen song, it's a ride in a Chevrolet...

04-24-2010, 02:54 PM	#7
zen Drives: 2011 CTS CPE & 2010 2LT/RS CGM Join Date: Jun 2009 Location: Nevada Posts: 337	There is a trade off between HP and Torque when you change the exhaust back pressure.

04-24-2010, 04:07 PM	#8
Sax1031 Drives: 2000 Mustang GT Join Date: Jul 2009 Location: Elgin,SC Posts: 2,707	What were your 60fts on the slower times compared to two weeks ago when you were running 13.5s? Was their a mph difference that was significant between the two?

04-24-2010, 04:48 PM	#9
longbeachss2010 Drives: black SS Join Date: Apr 2010 Location: long beach ca Posts: 363	it may be the mufflers deleted cause i got mines done. and loss 2 mpg of my car now i have 16mpg than stock with 19 mpg

04-24-2010, 06:09 PM	#12
rjcamaro 312 HP Drives: 2LT/RS RJT Join Date: Feb 2010 Location: NH Posts: 370	Had a '90 ZR-1 put on 3" exhaust on cat back and noticed she lack punch, even without racing I could tell I lost some HP. Spoke to a tuner said 3" was to much, went down to 2 3/4" exhaust and all the power came back and then some. Remember like I always said with every action there is a reaction. Sometimes good sometimes not so good..... __________________

04-24-2010, 07:59 PM	#13
THE EVIL TW1N Banned Drives: 2003 Cobra Convertible Join Date: Feb 2009 Location: CA Posts: 2,925	more importantly what were the MPH's? what were the MPH's of the other cars? i usually use LS1's or LT1's as a gauge. If i see almost stock LS1's trapping 105-107mph (LT1's 98-100) then i know itll be a decent day at least. But ive been to the track when LS1's would be consistently in the 99-102mph range (95-96mph-ish LT1s) when the weather was seemingly pretty good (track is at sea level and DA was OK), so go figure. If youre running slow and others are running slow then thats usually just the nature of the beast but if youre the only one not really in line then maybe it is your car......I dont think the muffler delete hurt power though, especially if you have your stock sized pipes. My friend deleted the muffler on his LT1 slowmaro way back when and that thing ran way better like that. and actually wasnt even THAT loud, sounded decent.

04-25-2010, 10:50 AM	#14
Napper Drives: 2SS RS A6/ CTS-V A6 LSA Join Date: Mar 2010 Location: SE Florida Posts: 258	It shouldn't matter on a s/c car.....turbo cars resond very well. NA car alway lose power with little to no backpressure __________________ 10 2SS(7Psi)/10 CTS-V(9Psi) L99, ADM RACE CAI, TVS 2300,LG- Headers and X pipe ,catless 3 inch back w/Magnaflows , Ngk plugs,Msd wires,180 stat,Springs ( lowered 1"- looks solidly correct)Sways and endlinks,BMR trailing arms, Slotted rotors and Hawk HPS ,tuned ,Black out bowtie and custom (black)"SS" on sides /midnight rims (8psi) 2010 Raven (triple black.)CTS-v , crank pulley, Bubb CAI , AR Headers, custom catlessback. magnaflows. tune ( 9psi) former LS7, LS2 and LS1 owner.(Zo6, GTO's, WS6)

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