Wideband goin crazy after LTs. - LS1TECH

Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > PCM Diagnostics & Tuning
Log In 
Search


PCM Diagnostics & Tuning
HP Tuners | AutoTap | Diablo | MAF Translator | HPP3 | FAST | Gen7 | Big Stuff 3
Sponsored by
Diablo Sport


Wideband goin crazy after LTs.

Reply
 
Thread Tools Search this Thread
Old 02-22-2007, 08:54 AM   #1
12 Second Club
 
MavrikTA's Avatar
 
Trader Rating: 27
Join Date: Feb 2006
Location: Texas....thank God.
Posts: 608
Default Wideband goin crazy after LTs.

I just installed LTs on an otherwise stock engine. My A/F, prior to the LTs, with cats, reading from the tailpipe was 13.8.
Now, with the headers and my AEM wideband, I am reading anywhere from 14.5-15.5. I thought the A/F would go the OTHER way after headers!
Kinda worried about this. What do yall think?
Im wonderin if it will just take some time for the ECM to relearn the perameters, because my guage is really everywhere.
__________________
88 GTA-sold
98 TA- sold
02 Z28- sold
95 Z28- sold
01 TA- sold
02 C5 -sold
2003 Z06, and goin at it again!
"BLOW ME!" says the angry LS6.
MavrikTA is offline   Reply With Quote
Old 02-22-2007, 09:01 AM   #2
TECH Addict
 
SSpdDmon's Avatar
 
Trader Rating: 10
Join Date: Jun 2004
Location: Howell, MI
Posts: 2,916
Send a message via AIM to SSpdDmon
Default

Tailpipe readings are kind of iffy to start with. A slight exhaust leak and your readings are shot.

However, headers will lean out a car just like any other mod that increases the engines ability to breathe. The PCM can only learn at light~moderate throttle, which it would then use to make assumptions about heavy~wide-open throttle. Either way, fueling can be off up to 8~10% with the stock parameters still in the PCM on a bolt-ons car. I would seriously think about investing in a tune, tuning software, or at least a MAF translator to help bring your AFR in line. Just make sure you get a better reading than from the tailpipe.
__________________
The best LS1 tuning software, period. - The preceding statement is solely a matter of opinion as expressed by a non-EFI Live affiliated individual with over half a decade of experience tuning LS1 equipped vehicles. It is in no manner an attempt to discredit, bash, or dishonor the alternative products offered by EFI Live competitors. Individuals interested in purchasing a tuning software package are highly encouraged to form their own damn opinions.

Last edited by SSpdDmon; 02-22-2007 at 09:07 AM.
SSpdDmon is offline   Reply With Quote
Old 02-22-2007, 09:04 AM   #3
12 Second Club
 
MavrikTA's Avatar
 
Trader Rating: 27
Join Date: Feb 2006
Location: Texas....thank God.
Posts: 608
Default

It is getting tuned Sat. Im just concerned about the meantime. The tailpipe reading was just offered as a "base" idea of what it was prior to the headers and on the dyno.
__________________
88 GTA-sold
98 TA- sold
02 Z28- sold
95 Z28- sold
01 TA- sold
02 C5 -sold
2003 Z06, and goin at it again!
"BLOW ME!" says the angry LS6.
MavrikTA is offline   Reply With Quote
Old 02-22-2007, 09:07 AM   #4
TECH Addict
 
SSpdDmon's Avatar
 
Trader Rating: 10
Join Date: Jun 2004
Location: Howell, MI
Posts: 2,916
Send a message via AIM to SSpdDmon
Default

It should be fine as long as you keep your foot out of it....in the mean time.
__________________
The best LS1 tuning software, period. - The preceding statement is solely a matter of opinion as expressed by a non-EFI Live affiliated individual with over half a decade of experience tuning LS1 equipped vehicles. It is in no manner an attempt to discredit, bash, or dishonor the alternative products offered by EFI Live competitors. Individuals interested in purchasing a tuning software package are highly encouraged to form their own damn opinions.
SSpdDmon is offline   Reply With Quote
Old 02-22-2007, 09:36 AM   #5
LS1TECH Sponsor
 
foff667's Avatar
 
Trader Rating: 1
Join Date: Jul 2003
Location: Clermont, FL
Posts: 7,983
Send a message via AIM to foff667
Default

are you reading 14.5-15.5 at wot or idle/part throttle...at part throttle those numbers are perfectly normal.
foff667 is offline   Reply With Quote
Old 02-22-2007, 09:53 AM   #6
12 Second Club
 
MavrikTA's Avatar
 
Trader Rating: 27
Join Date: Feb 2006
Location: Texas....thank God.
Posts: 608
Default

That is just part throttle/idle. That makes sense. It never got a chance to really warm up this morning, and I WILL NOT run an engine hard untill it is warm enough. I will open her up on the way home then and see what she runs.
__________________
88 GTA-sold
98 TA- sold
02 Z28- sold
95 Z28- sold
01 TA- sold
02 C5 -sold
2003 Z06, and goin at it again!
"BLOW ME!" says the angry LS6.
MavrikTA is offline   Reply With Quote
Old 02-23-2007, 08:56 AM   #7
12 Second Club
 
MavrikTA's Avatar
 
Trader Rating: 27
Join Date: Feb 2006
Location: Texas....thank God.
Posts: 608
Default

Yup that was it. At WOT the A/Fs were high 13's to low 14's. Thanks guys!
__________________
88 GTA-sold
98 TA- sold
02 Z28- sold
95 Z28- sold
01 TA- sold
02 C5 -sold
2003 Z06, and goin at it again!
"BLOW ME!" says the angry LS6.
MavrikTA is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are On
Refbacks are Off


 

All times are GMT -5. The time now is 01:09 AM.


Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details