[diabloadsit]

Originally Posted by LSE

^
yeah that's weird. I will trim some more off the frame since I think it is hitting when I break and the engine leans forward.

I ended up rescheduling my protune. sensor should be here tomorrow and hopefully installed sunday. I really like the headers and they sound great. Too bad this sensor had to rain on my parade.

did you guys notice lower EGTs that usual after the headers went up? normally I'd get 1400's and now it's around 1200's. I figured since the plastic undertray cover is off, the headers are cooling off faster. has anybody tried to put the plastic cover back on with an aftermarket header?

I don't know what my EGT's where before hand but I know run about 1150's or so. I have noticed if I run straight 93 it is about 1150's with 105 oct. and 93 mix she gets about 1200.
Why did you take your plastic undertray off? Mine under tray fits fine. I do have the beatrush alm one though not plastic anymore.

[LSE]

^I was told by the shop that it wasn't going to fit properly with the plastic cover on.

I just got off the phone with them and they will look at the sensor again to see if it looks busted. I'm tossing a new sensor in just in case.

However, it is possible that the problem is the header manifold flowing too much air and the sensor is just failing at that point because of the increased flow? I know these headers are used by many of you, which leads me to belive that's not the case...and some of you run large turbos on catless setups with that sensor which I bet flow way more air faster pass that sensor than my catted vf39.

I don't think you need to be tuned for just a header set. I was told this by many of you and xxChris. xx warned me that they cannot tune the car if it throws a cel on the dyno. I think it's going to boil down to, either gets fixed with the new sensor or I'm pullng the headers out. *sigh*

This was supposed to be a cake mod

[diabloadsit]

LOL, there is never anything that can be considered a cake mod. Yea I am running a 20G and the same headers and uppipe with a Turbo XS turbo back with a race pipe and had no problems. Chris also did the final tune for my car and they installed the headers also. More than likely a bad sensor. Has to be. Or something around in that area dealing with it.

[LSE]

yeah but it's just a header you know. people swap them w/o tune all the time no prob.

[EFI Logics]

If your MPG has taken a huge drop, then your primary 02 is the culprit. If the 02 threw a code, but then came back after you reset the ECU, get it swapped out before your tune because if the 02 dies during your tuning session, the session will end unless you can get a replacement.

A note:

For cars running serious street duty, or road race, we like to run the innovate heat sink to take some of the load off the 02 sensor, this will greatly reduce the chance of failure, especially if your running race gas. Our road race cars were going through a primary 02 every other session, we run the heat sink, and all the issues went away with absolutely no detrimental affects on the tune or response to the STFT's.




- Chris

[LSE]

^
cool. literally. makes me want to put one of those things.

what kills an o2 sensor anyways? I doubt that althought the headers I put are double coated, things are that much hotter in there. For one thing, the EGT gauge I have went down 200F on average compared to stock.

Does physical shock kill these things? Some mechanic I spoke to, says you can toss one across the street, pick it up and it will be fine...

[EFI Logics]

Originally Posted by LSE

Does physical shock kill these things? Some mechanic I spoke to, says you can toss one across the street, pick it up and it will be fine...

That guy is an idiot and should stick to carb's and mechanical fuel injection.

Leaded Race fuel can kill an 02, along with improper installation or installation too close to the combustion flame. The stock location is good, but at times when running the car hard for extended periods of time, it will dramatically drop the life of the sensor.

I think you just got a bad one, simple as that.

[LSE]

^ha ha ha. I got curious as to causes of failure and they also list using silicone sealer on gaskets that is not o2 sensor safe. I'll ask the shop to see if they used any of that crap.

Also, I was reading the sensor compares o2 levels outside and inside the exaust. does it sample the air outside directly?. I'm running without the plastic under tray...is this a bad idea? I'm thinking water and other crap can probably reach it...it's been dry all week though and the thing looks clean enough. Also does the amount of air going past on the outer part of the sensor affect how it reads? not sure how the air flow changed under the car w/o the cover on.

new sensor arrived today. I'll keep you guys posted on how it goes. I'm going to ask to have the tray mounted back and the new sensor. hopefully it doesn't melt.

[LSE]

I'd like to post this link for people who get this in the future. apparently this problem has happened to a good bunch of people after installing headers.

the headers my research found about are the ones using the gt-spec/maddad/tomei design. coated or uncoated didn't matter. it seems something damages the sensor when installing these. what is it exactly I don't know. some people theorized that the coating on inner coated headers kills the sensor on first install due to improper cure. I don't know if that's the case. you be the judge.

header=cel - NASIOC

most people solved the problem by installing a new front o2 sensor save 1 poor guy who went past a couple. I have yet to follow up with him to see if he solved the issue.

I'd like to caution people on this upgrade. I'm sure plenty of you "did it just fine". nonetheless, at least 8 people seem to have gotten this.

[LSE]

UPDATE:

these are the pics of the suspected sensor. Notice the ding.

[diabloadsit]

Wow, mybe the shop that did it messed it up and didn't relize it? My install was flawless, so I am a lucky one I guess. Besides the guy breaking exhaust bolts trying to take them off.