Homepage Garage Wiki Register Members List Social Groups Calendar Search Today's Posts Mark Forums Read
#Camaro6
Go Back   CAMARO6 > CAMARO6.com General Forums > ZL1 Discussions


Bigwormgraphix


Post Reply
 
Thread Tools
Old 12-25-2020, 07:10 PM   #1
clg82
 
Drives: 2018 Camaro ZL1
Join Date: Oct 2020
Location: California
Posts: 130
Is black smoke normal?

Well finally reached break-in mileage and took the car to ventura and did some spirited driving on the highway as well as some side roads, buddy that I was driving with in a GT350 (i know i know ) said he noticed some puffs of black smoke coming from my tailpipes when going full throttle.....the car is basically stock aside from a throttle body and catback borla exhaust, is this normal to have black smoke coming out when going full throttle? Something I should keep my eye on?
__________________
Currently looking for another A10 ZL1

2018 ZL1 A10 Silver Ice Metallic; Mamo Throttle Body V2, FabTech CAI, Borla Catback Exhaust, M2W Switch - TOTALED

2000 Trans Am Arctic White
clg82 is offline   Reply With Quote
Old 12-25-2020, 07:33 PM   #2
Crusher Camaro
 
Drives: 19 ZL1
Join Date: Jan 2019
Location: Tampa Fl
Posts: 54
Yes, more obvious under WOT.

I notice it even more when traction control kicks in.
Pretty sure they keep these engines on the rich side when under boost.
Crusher Camaro is offline   Reply With Quote
Old 12-25-2020, 10:49 PM   #3
Stephen12ZL1


 
Stephen12ZL1's Avatar
 
Drives: '21 ZLE A10
Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,349
normal for a little puff as these things run pretty rich...nothing to worry about. If you did it more than once, the smoke would likely be less.
__________________
'21 ZLE A10 Wild Cherry PDR
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold)
'15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold)
'12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)
Stephen12ZL1 is offline   Reply With Quote
Old 12-25-2020, 10:57 PM   #4
clg82
 
Drives: 2018 Camaro ZL1
Join Date: Oct 2020
Location: California
Posts: 130
Probably a stupid question, but why would GM tune the car to run so rich?
__________________
Currently looking for another A10 ZL1

2018 ZL1 A10 Silver Ice Metallic; Mamo Throttle Body V2, FabTech CAI, Borla Catback Exhaust, M2W Switch - TOTALED

2000 Trans Am Arctic White
clg82 is offline   Reply With Quote
Old 12-25-2020, 11:09 PM   #5
Stephen12ZL1


 
Stephen12ZL1's Avatar
 
Drives: '21 ZLE A10
Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,349
Quote:
Originally Posted by clg82 View Post
Probably a stupid question, but why would GM tune the car to run so rich?
fuel has a cooling effect in the cylinder so richer is cooler with less tendency towards damaging detonation. This is especially true in supercharged applications because of the heat generated by greater cylinder pressure.
__________________
'21 ZLE A10 Wild Cherry PDR
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold)
'15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold)
'12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)
Stephen12ZL1 is offline   Reply With Quote
Old 12-26-2020, 12:38 AM   #6
LT4Greg


 
LT4Greg's Avatar
 
Drives: 2017 Camaro ZL1 Coupe
Join Date: May 2016
Location: Georgia
Posts: 3,987
The engines are tuned pig rich to keep from blowing up. If it runs too lean then you get engine damage and or failure.
__________________
ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.
LT4Greg is offline   Reply With Quote
Old 12-26-2020, 12:46 AM   #7
Camaro1973
 
Camaro1973's Avatar
 
Drives: 2019 ZL1
Join Date: Mar 2019
Location: NJ
Posts: 243
Quote:
Originally Posted by clg82 View Post
Well finally reached break-in mileage and took the car to ventura and did some spirited driving on the highway as well as some side roads, buddy that I was driving with in a GT350 (i know i know ) said he noticed some puffs of black smoke coming from my tailpipes when going full throttle.....the car is basically stock aside from a throttle body and catback borla exhaust, is this normal to have black smoke coming out when going full throttle? Something I should keep my eye on?

Be very careful with this, as puffs of smoke may not be simply from running rich. This is a very common sign of detonation. Puffs would be bursts of black/greyish smoke. Common black smoke from running rich doesnt usually happen in puffs, unless its happening immediately going full throttle. If the puffs are under load and at WOT its very possible its detonation.
Camaro1973 is offline   Reply With Quote
Old 12-26-2020, 07:30 AM   #8
hawk02
Coupe Newbie
 
hawk02's Avatar
 
Drives: 2017 Mosaic Black Metallic ZL1
Join Date: Jul 2011
Location: Columbus, Ohio
Posts: 2,674
Quote:
Originally Posted by Stephen12ZL1 View Post
fuel has a cooling effect in the cylinder so richer is cooler with less tendency towards damaging detonation. This is especially true in supercharged applications because of the heat generated by greater cylinder pressure.
This and the computer is also programmed to dump more fuel to cool the catalytic converters. It referred to as cat over-temp protection or COT.
__________________
hawk02 is offline   Reply With Quote
Old 12-26-2020, 09:59 AM   #9
Gunkk
Thank you Al Oppenheiser!
 
Gunkk's Avatar
 
Drives: Red Hot A10 ZL1 Convertible
Join Date: Jun 2017
Location: Sarasota, FL
Posts: 3,667
Quote:
Originally Posted by clg82 View Post
... is this normal to have black smoke coming out when going full throttle?
Yes it's normal. Don't worry about it.

Gunkk is offline   Reply With Quote
Old 12-26-2020, 10:20 AM   #10
JSH
 
JSH's Avatar
 
Drives: '20 ZL1 1LE Shadow Grey Metallic
Join Date: Jun 2020
Location: Lakewood, CO
Posts: 688
Black smoke normal, blue smoke death
__________________
OEM short block
HPE custom cam, valve train, and heads
FII blower spacer plates & thermal reduction blanket
Kong ported blower/snout
NW 103mm ported TB
Griptec snout pulley ( 2.4)
MMS catch can, mild
DSX low side pump
Kooks Long tubes and Hi-flow cats
Custom heat exchangers, RotoFab
Remote tuned/ no dyno # yet
Tires: Street - Michelin Pilot Sport 4S; Track - Goodyear Eagle F1 Supercar 3R
JSH is offline   Reply With Quote
Old 12-26-2020, 10:56 AM   #11
Joshinator99

 
Joshinator99's Avatar
 
Drives: 2017 Camaro 2SS A8
Join Date: Aug 2018
Location: Petersham MA
Posts: 1,565
Quote:
Originally Posted by Camaro1973 View Post
Be very careful with this, as puffs of smoke may not be simply from running rich. This is a very common sign of detonation. Puffs would be bursts of black/greyish smoke. Common black smoke from running rich doesnt usually happen in puffs, unless its happening immediately going full throttle. If the puffs are under load and at WOT its very possible its detonation.
This. The OP is in California, where if I’m not mistaken only 91 octane is available. So some knock retard is not off the table.
__________________
2017 Chevy Camaro 2SS A8 Whipple 8.00/3.25, Mast Motorsports Black Label LT1 heads, CamMotion custom blower cam, Katech VVT & AFM delete covers, Rotofab Big Gulp, Katech 103mm TB, DW400 in tank pump w/JMS, Johnson 2110R lifters, GPI forged pistons & rods, LPE +52 injectors, LPE BB HPFP, AWE Touring CB, GForce 3.5” DS, GForce Outlaw axles, 2” ceramic coated Dynatech headers, MM Wild CC, LPE check valve, everything BMR makes, OEM 1LE wheels (street), Forgestar D5 bead locks (track)
2019 Toyota Sequoia Limited 4WD (daily driver)
2018 Alfa Romeo Giulia Ti Sport Q4 (hers)
Joshinator99 is offline   Reply With Quote
Old 12-26-2020, 10:57 AM   #12
JSH
 
JSH's Avatar
 
Drives: '20 ZL1 1LE Shadow Grey Metallic
Join Date: Jun 2020
Location: Lakewood, CO
Posts: 688
And no or high flow cats equal lots of black smoke
__________________
OEM short block
HPE custom cam, valve train, and heads
FII blower spacer plates & thermal reduction blanket
Kong ported blower/snout
NW 103mm ported TB
Griptec snout pulley ( 2.4)
MMS catch can, mild
DSX low side pump
Kooks Long tubes and Hi-flow cats
Custom heat exchangers, RotoFab
Remote tuned/ no dyno # yet
Tires: Street - Michelin Pilot Sport 4S; Track - Goodyear Eagle F1 Supercar 3R
JSH is offline   Reply With Quote
Old 12-26-2020, 12:02 PM   #13
SJFGTO
Oh Oh it's Friday Night!
 
SJFGTO's Avatar
 
Drives: 2018 ZL1 1LE Nightfall Gray
Join Date: Jan 2018
Location: Walton Woods
Posts: 825
Quote:
Originally Posted by hawk02 View Post
This and the computer is also programmed to dump more fuel to cool the catalytic converters. It referred to as cat over-temp protection or COT.
Yes^^^
__________________
2018 Camaro ZL1 1LE NFG; ARH 2” headers, catless mids, ARH full exhaust, Lingenfelter 18% lower pulley, ATI Harmonic Balancer, Roto-fab CAI, EE-catch can, TM ported TB, NX Lid, BMR strut tower brace. Aeroforce dual pod interceptor gauges. Tuned by Vengeance Racing!!! 644 HP @ 6250 rpm / 689 trq @ 3660 rpm

Four that wanna own me
Two that wanna stone me
One says she's a friend of mine...
SJFGTO is offline   Reply With Quote
Old 12-26-2020, 12:06 PM   #14
Z OH 6
 
Z OH 6's Avatar
 
Drives: 2021 Red Hot ZL1
Join Date: Sep 2020
Location: GA
Posts: 567
Quote:
Originally Posted by Stephen12ZL1 View Post
fuel has a cooling effect in the cylinder so richer is cooler with less tendency towards damaging detonation. This is especially true in supercharged applications because of the heat generated by greater cylinder pressure.
That may be the generic answer, but I can tell you that we had two Hellcat's for over 2 years and one never puffed smoke, the other always did on hard acceleration and I doubt the tuning was any different between the two. Most of the Hellcat videos I've seen rarely ever puff any smoke. I've seen a lot of ZL1s online that seem to puff black smoke so I know its apples and oranges comparing a Hellcat to ZL1 but both are similar engine configurations, the only major difference being that the ZL1 is direct injection. Quite frankly, performance car or not, I think its embarrassing to have a car puffing smoke on hard acceleration. I haven't noticed mine doing it, I've seen a little smoke once or twice in the rear view, maybe its doing it more often than I think but I haven't been following my car while someone else was driving it.
__________________
2021 Camaro ZL1 - Red Hot A10 - Vengeance Racing Stage III - 678whp SAE/697whp STD on pump 93
Z OH 6 is offline   Reply With Quote
 
Post Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:09 PM.


Powered by vBulletin® Version 3.8.9 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.