Corvette Performance - Running Rear o2s in the Front bung

My tuner has informed me that my front o2 sensors cant perform up to par. he said i need to look at running my REAR o2 sensors in the front locations due to the rear sensor being able to run hotter. has anyone done this???

FWIW i have Kooks 1 7/8LTs.

Actually, they are the same sensor.

The only difference is the longer cord/cable on the rears.

You can run rears on the front, but it will have no bearing on heat... same thing just with extra cord left over.

so the plug-ins on the o2s are exactly the same???

yes the plugs are exactly the same, i know some cars call for the same sensor in all four and some call for a differant one, some may have a better heater than others, but they all work.

good becuz i currently have the LG wiring harness for extending the front wires, now i just need a better (Hotter) sensor since the fronts a moved farther from the Exhaust port.

I run rear O2 sensors in my front bungs on my longtubes, the connectors are different, but if you have the LG adapters you're ok

ok so the connectors from front to rear are different! Thanks

hum... maybe the vettes have differant plugs on them..... what year is the car? i know the fbodys all four are exactly the same. are the ls1 vette's differant front to back too, or just later ones? i stand corrrected

2001 ls6 z06

the plugs are differant in frount & rears the 02 sensors are the same

Are you getting codes after the header install?

no im not getting codes my tuner just had to shut off my LTFT for both banks due to trouble tuning with the o2s not running hot enough

Yea the plus are different, I run my rears in the front

no im not getting codes my tuner just had to shut off my LTFT for both banks due to trouble tuning with the o2s not running hot enough

So is there a hotter o2 sensor?

Yea the plus are different, I run my rears in the frontso are you runing cats

nope, no cats. ls1c5vette with the plugs being different how did you connect them??

no im not getting codes my tuner just had to shut off my LTFT for both banks due to trouble tuning with the o2s not running hot enough

WTF?!?!? First I am not sure that is even possible. Second, why in the hell would you want to do that. In closed loop mode, the LTFT are very important in determining the amount of fuel to be delivered. Has your tuner worked on a EFI car before.

WTF?!?!? First I am not sure that is even possible. Second, why in the hell would you want to do that. In closed loop mode, the LTFT are very important in determining the amount of fuel to be delivered. Has your tuner worked on a EFI car before.

um... not only very possible but very common. short trims are the norm for tuning. much faster and better than waisting a tank of gas waiting for long trims to settle in and average out. if the tune is inline the long trims are not needed. most turn them back on after tuning but some dont, ive had mine turned off for over a year. they are only used as a stored look up table, short trims are your instant fueling.

My tuner has been tuning cars for about 8yrs now. Its Dyno Dan owner of Dynosport in Lincoln.

http://www.dynosport.com/

Heres his website.

WTF?!?!? First I am not sure that is even possible. Second, why in the hell would you want to do that. In closed loop mode, the LTFT are very important in determining the amount of fuel to be delivered. Has your tuner worked on a EFI car before.

I am friends with one of the owners of HP Tuners. He had LTFT's turned off in my car when I bought it from him, so I'll take a guess that it isn't that big of an issue.:lol:

so are you runing cats

No cats

nope, no cats. ls1c5vette with the plugs being different how did you connect them??

Bought adapters for $50 from I forget where

I'm new here, and don't want to be a smart guy, but, from everything that I've ever been told regarding C5 Corvettes is, that the rear o2 sensors have a hotter heater than the fronts. That is why many people recommend placing rear o2s in front when adding headers. Again, I'm no authority, but I have been advised of this by a few well learned C5 people. Mike

Just found this on another thread info from a Bosch tech:

'He did shed some light on some of the issues at hand. First off, he said that the heaters in the front sensor are the same as the heaters in the Corvette rear. However, there is a difference in the baffling of the sensors and that the baffling does effect the temp they run at, and due to this difference he thought that the rear Corvette sensors, when used as fronts, would be at an advantage over the fronts.'


So I stand corrected, sensors appear to be the same, with different baffling.