Data Logs! Post them here.

[Sovereign]

Originally Posted by steve99

ok if it only started after header install it does point to gasket leak at engine overpipe connection or at the 02sensors them selves.

new gaskets ?

did you run a thread tap chaser through the header o2 threads, if you had to force o2 sensors in it can damage the threads causing a leak.

check the sensors are pluged in correctly black to black and grey plug to grey socket.

So I just came back to the shop that installed my headers and overpipe he said there are no gasket leaks and the sensors aren't leakin as well. There is also a defouler on the header can that be causing the bad o2 reading?

[steve99]

Originally Posted by Sovereign

So I just came back to the shop that installed my headers and overpipe he said there are no gasket leaks and the sensors aren't leakin as well. There is also a defouler on the header can that be causing the bad o2 reading?

If the defouler is on the front 02 sensor yes it will cause a problem.

you dont need it as the tune disables the p0420 cel code.

you still dont need it on rear o2 sensor but it should not cause to much issue their.

are you using stock intake ? drop in filter ot intake tube ok but if complete intake changed can cause maf scaling and hence fueling issues without maf rescaling.

[bspec]

Hi there - can someone tell me if this looks normal/safe?
http://datazap.me/u/bombino/summer-c...log=0&data=1-2

If it looks good, I have MAF scaling for an AEM airbox that I'll post to the MAF thread. I'm on a stg1 91oct tune today, and I'm installing this weekend, along with a few other things, a header + stg2 EL tune; so I won't have much more time to mess with the stg1 tune.

sidebar: if I've MAF scaled for my intake on a stg1 tune, should I be able to plug those values into a stg2 tune and go?

Thanks very much

[phrosty]

Originally Posted by bspec

Hi there - can someone tell me if this looks normal/safe?
http://datazap.me/u/bombino/summer-c...log=0&data=1-2

If it looks good, I have MAF scaling for an AEM airbox that I'll post to the MAF thread. I'm on a stg1 91oct tune today, and I'm installing this weekend, along with a few other things, a header + stg2 EL tune; so I won't have much more time to mess with the stg1 tune.

sidebar: if I've MAF scaled for my intake on a stg1 tune, should I be able to plug those values into a stg2 tune and go?

Thanks very much

Wrong link? Not working.

Stage 2's MAF scaling runs slightly richer up top, I guess for safety's sake. I'd re-scale once you run it, but you can probably use yours as a starting point.

[bspec]

Originally Posted by phrosty

Wrong link? Not working.

Stage 2's MAF scaling runs slightly richer up top, I guess for safety's sake. I'd re-scale once you run it, but you can probably use yours as a starting point.

Sorry, I thought private=unlisted. It's public now. And thanks for the feedback.

[Sovereign]

Originally Posted by steve99

If the defouler is on the front 02 sensor yes it will cause a problem.

you dont need it as the tune disables the p0420 cel code.

you still dont need it on rear o2 sensor but it should not cause to much issue their.

are you using stock intake ? drop in filter ot intake tube ok but if complete intake changed can cause maf scaling and hence fueling issues without maf rescaling.

It's on the front o2 that's the issue. When I take it off I'll be back to update. Thanks! It's a drop in filter by K&N but I doubt that is causing the issues

[phrosty]

Originally Posted by bspec

Sorry, I thought private=unlisted. It's public now. And thanks for the feedback.

You're running a bit lean when WOT. Give your LTFTs some time to build up.

[bspec]

Originally Posted by phrosty

You're running a bit lean when WOT. Give your LTFTs some time to build up.

phrosty,

I flashed this last tune on Monday of this week. How many miles do you typically put on the car, after a tune, before the fuel trim learning diminishes?

[phrosty]

Originally Posted by bspec

phrosty,

I flashed this last tune on Monday of this week. How many miles do you typically put on the car, after a tune, before the fuel trim learning diminishes?

If you're driving steadily, it learns fuel trims pretty quick. Have you done any faster driving since Monday?

[bspec]

Originally Posted by phrosty

If you're driving steadily, it learns fuel trims pretty quick. Have you done any faster driving since Monday?

I've driven around town a bit, and done maybe 4-6 3rd gear runs to redline. No highway driving though. I'd say I've put maybe 50 miles on.

[Phantobe]

Originally Posted by bspec

phrosty,

I flashed this last tune on Monday of this week. How many miles do you typically put on the car, after a tune, before the fuel trim learning diminishes?

Your trims shouldn't take that long to learn maybe like 20 miles...

You may want to look at maf scaling... See my thread as I was running lean too.

[phrosty]

Originally Posted by bspec

I've driven around town a bit, and done maybe 4-6 3rd gear runs to redline. No highway driving though. I'd say I've put maybe 50 miles on.

Fuel trims only learn in closed loop. When you're beyond around 20-30% throttle, it's probably in open loop.

[bspec]

Originally Posted by Phantobe

Your trims shouldn't take that long to learn maybe like 20 miles...

You may want to look at maf scaling... See my thread as I was running lean too.

dammit. I've already got quite a bit of time into MAF scaling, and almost no time to tweak it before going stg2. Doesn't help that the latest OFT firmware corrupts datalogs >20min long.

Guess I'll re-do the MAF scaling w/ the new tune.

Thanks for the feedback.

[bspec]

Originally Posted by phrosty

Fuel trims only learn in closed loop. When you're beyond around 20-30% throttle, it's probably in open loop.

really? I see the ECU go into open loop at what feels like 50-60% throttle, if not higher.