AIR/FUEL ratio changes after ls6 and true dual install
12-07-2004, 11:09 PM
#1
TECH Regular
Thread Starter
iTrader: (4)
Join Date: Jun 2004
Location: Beachwood, Ohio
Posts: 486
Likes: 0
Received 0 Likes
on
0 Posts
AIR/FUEL ratio changes after ls6 and true dual install How much will the addition of true duals and an ls6 intake on a 99z28 camaro throw off a car's air fuel ratio?
Must I update the injectors on my tsp cammed car to deal with the ls6 and 3in. duals? My headers are glowing due to a probable lean condition and I am trying to fugure out why. Will a HP tuners tune fix my problem?
Must I update the injectors on my tsp cammed car to deal with the ls6 and 3in. duals? My headers are glowing due to a probable lean condition and I am trying to fugure out why. Will a HP tuners tune fix my problem?
12-07-2004, 11:17 PM
#2
On The Tree
Join Date: Jul 2002
Location: Edmonton, Alberta
Posts: 109
Likes: 0
Received 0 Likes
on
0 Posts
That seems odd... So far I've added a FAST intake, descreened MAF, LS6 Cam, Stage 2 heads, headers, no cats and though i've changed the timing table a bit, my LTRIMS are perfect except for being rich at idle RPMs.... with the stock tables... I think maybe you should look for somthing mechanical in nature, like a vacuum leak, cam timing, etc... There's no way the stock PCM will allow the AFR to be that far off (and i'm assuming you're seeing this with the car idling)
12-07-2004, 11:45 PM
#3
TECH Regular
Thread Starter
iTrader: (4)
Join Date: Jun 2004
Location: Beachwood, Ohio
Posts: 486
Likes: 0
Received 0 Likes
on
0 Posts
Both header banks glow at idle(200rpm and up) .The car smells strong like fuel. Burns your eyes. I have header tape on the lower portion of the headers. I used to(old headers) get transition time o2 sensor codes. I assumed it was due to cold sensors, so I added header wrap to heat the collectore up. Could that cause the upper header area to hold enough heat to glow?
I have no idea what it could be. I swapped my tts lt headers for pacesetters when I changes my ex. system over to duals.
I guess there is no way to tell unless I purchase HP tuners and can do a proper scan. My predator is only so useful. What should timing be at idle? map sensor reading at idle?
I have no idea what it could be. I swapped my tts lt headers for pacesetters when I changes my ex. system over to duals.
I guess there is no way to tell unless I purchase HP tuners and can do a proper scan. My predator is only so useful. What should timing be at idle? map sensor reading at idle?
12-13-2004, 02:40 PM
#5
Do you have cats? IIRC backed up cats can glow and possibly cause the headers to glow as well? Just like forced induction heating up the intake air temp, a severe exhaust restriction may be able to build up pressure and superheat the exhaust manifolds / headers. Just one theory.
12-15-2004, 12:07 AM
#7
About a year ago I did just a TB and exhaust swap. I was rich all over the place including idle. Remember though, you will get some fumes with the duals. Timing at idle can vary from application to application. On my personal car, it varies from 22-28*. Also, my MAP at idle is about 45-51KPA. I have several buddies that are in the 55-70KPA Range. Different cams.
