03CL55AMG Posted September 21, 2014 Report Share Posted September 21, 2014 Today I logged some hwy miles on the quest...a/f @75mph..with the cruise engaged, were mid 15s...if the cruise gave it some gas the A/F would dip into the high 14s...during coasting the a/f would be in the high 15s to high 16s or may even touch low 17s...do theese seem normal?. Link to comment Share on other sites More sharing options...
PSiTSi Posted September 21, 2014 Report Share Posted September 21, 2014 The A/F ratio that you want to be shooting for while any cruising speed is 14.7. There's a little wiggle room up to 15.0-15.2 but as long as it's not a consistent cruising ratio, then that's alright. When letting off the throttle, depending on your gauge, the A/F ratio will lean out and go 16, 17 or higher. Basically the computer cuts fuel during decel. So in other words don't worry about the ratio when you let off the gas. Link to comment Share on other sites More sharing options...
scott87star Posted September 21, 2014 Report Share Posted September 21, 2014 Seem fine. If you are running a narrow band O2 to the factory ECU then at cruise you should see it constantly cycle between 14.3-15.5 or so, that indicates you are in "closed loop" mode and the ECU is strictly using the O2 sensor for fueling. Link to comment Share on other sites More sharing options...
03CL55AMG Posted September 21, 2014 Author Report Share Posted September 21, 2014 I am running a wide band, so those a/f that I posted are wide band numbers...seems that I read a post on this forum once where mid 15s air/fuel crusing was optimum for gas milage...but I wanted to check. Link to comment Share on other sites More sharing options...
monty87 Posted October 4, 2014 Report Share Posted October 4, 2014 I want to install my innovate a/f wideband as well. this info is great to know! Link to comment Share on other sites More sharing options...
Preludedude Posted October 5, 2014 Report Share Posted October 5, 2014 I have an innovate as well....is the factory o2 required? Or can I just plug it? I welded in a bung for the wideband lower down the downpipe.... Link to comment Share on other sites More sharing options...
scott87star Posted October 5, 2014 Report Share Posted October 5, 2014 The factory ECU needs the narrowband signal or it will never go into closed loop, your innovate likely has a narrowband output as well as a wideband output, just hook it to the factory single wire and plug the hole if you wish. Link to comment Share on other sites More sharing options...
Funky Phil Posted October 6, 2014 Report Share Posted October 6, 2014 as long as its running fine your good. It all depends on the setup. Link to comment Share on other sites More sharing options...
Evoz17 Posted October 6, 2014 Report Share Posted October 6, 2014 The factory ECU needs the narrowband signal or it will never go into closed loop, your innovate likely has a narrowband output as well as a wideband output, just hook it to the factory single wire and plug the hole if you wish. I have the AEM wideband wich has a setting where it will simulate a narrow band signal. What you are saying i could tap the narrow band wire off the gauge to the ecu 02 wire and get rid of my stock o2 sensor? Link to comment Share on other sites More sharing options...
scott87star Posted October 6, 2014 Report Share Posted October 6, 2014 Yes, exactly that. Link to comment Share on other sites More sharing options...
Funky Phil Posted October 6, 2014 Report Share Posted October 6, 2014 They have been known to run better off the widebands. Link to comment Share on other sites More sharing options...
03CL55AMG Posted October 20, 2014 Author Report Share Posted October 20, 2014 So do all widebands have the narrow band wire...so how does this bennifit thd car to be in closed loop...if I am reading this correctly Link to comment Share on other sites More sharing options...
TexasQuest Posted October 20, 2014 Report Share Posted October 20, 2014 My afr's at idle are 13.4, seems kinda rich at idle for a tbi car? Link to comment Share on other sites More sharing options...
importwarrior Posted October 20, 2014 Report Share Posted October 20, 2014 TBI seems to like a rich idle. Link to comment Share on other sites More sharing options...
scott87star Posted October 20, 2014 Report Share Posted October 20, 2014 Yes, they idle rich, most motors like a little rich idle. Not all wide band O2's have a narrow band emulation but it is fairly common. Innovate allows you to program the output for whatever you want on their old LC-1 (crappy) and new LC-2 models. Link to comment Share on other sites More sharing options...
TexasQuest Posted October 20, 2014 Report Share Posted October 20, 2014 Good deal. I've always heard rule of thumb: better to be rich than lean. Link to comment Share on other sites More sharing options...
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