FT-86 SpeedFactory Catted UEL Header

[kodyo]

Originally Posted by NissanGuy

I admit I didn't re-tap the holes or use anti-seize, but I've actually replaced all the gaskets twice (lesson learned: Grimmspeed literally blows), and followed up with a smoke test to verify no leaks. Apparently this fault code (nominally for a stuffed cat) happens to a lot of people with this header.

Most people getting leaks aren't getting the p0420 code alone. It's likely just a mismatch between what the ecu expects to see after the cat and what it is actually seeing.

[nunonuna]

Originally Posted by kodyo

Most people getting leaks aren't getting the p0420 code alone. It's likely just a mismatch between what the ecu expects to see after the cat and what it is actually seeing.

If you have chance, would you mind logging data channel of AFR and wide band AFR from OFT? AFR in OFT is primary O2 sensor reading and wide band AFR channel is rear O2 sensor reading. I just want to compare yours with mine to see if there is difference because mine never throw CEL with full exhaust also.
I will also post mine soon.

[Koa]

Originally Posted by NissanGuy

I admit I didn't re-tap the holes or use anti-seize, but I've actually replaced all the gaskets twice (lesson learned: Grimmspeed literally blows), and followed up with a smoke test to verify no leaks. Apparently this fault code (nominally for a stuffed cat) happens to a lot of people with this header.

mate, I've used G/S gaskets, including their phenolics, for years. Soo many other people use their gaskets to great effect. User error or header error, sorry to burst your bubble.

[2016 Camaro SS]

Same here, Grimmspeed gaskets are the best ones to use. I also re-use them and they work just fine and seal great. Worth the extra penny. I've got a set on my header and all of my 2.5" gaskets are Grimmspeed's. No leaks.

[kodyo]

Originally Posted by nunonuna

If you have chance, would you mind logging data channel of AFR and wide band AFR from OFT? AFR in OFT is primary O2 sensor reading and wide band AFR channel is rear O2 sensor reading. I just want to compare yours with mine to see if there is difference because mine never throw CEL with full exhaust also.
I will also post mine soon.

Here's a log I took last night with the OFT Stage 1 93 oct tune, P0420 disabled.
Should have 3 100% throttle runs and some good cruising time (was trying to use it to scale my MAF, but gave up since its 50F outside).

http://www.datazap.me/u/kodyo/log-24215?log=0&data=0-1

[nunonuna]

Originally Posted by kodyo

Here's a log I took last night with the OFT Stage 1 93 oct tune, P0420 disabled.
Should have 3 100% throttle runs and some good cruising time (was trying to use it to scale my MAF, but gave up since its 50F outside).

http://www.datazap.me/u/kodyo/log-24215?log=0&data=0-1

Thanks for sharing your log.
I'm not the expert, but it seems like that your rear o2 reading fluctuates very often while regular driving & when it does that, the rear o2 reading goes above of front o2 reading (1251 sec. ~ 1254 sec. mark for example). Front O2 seems fluctuate also. Lines are zigzag-ish.

I checked all of my logs, but I did not find any similar activity like yours. Most of the time rear o2 reading stays below front o2 reading. & both lines are steady.

Also at WOT, mine shows rear O2 value is 1 ~ 1.5 less than front O2 reading value, but your about 0.5 less than front O2.

I'm not pro/expert so I can't tell what is exactly causing it, but it seems not normal for me. I guess even if the cat is not as efficient, at least it should give constant AFR reading of O2 unless it is broken or defective, but yours just goes up and down while cruising driving. If I were you I would not just rely on disabling the code in this case.

My poor guess would be there may be leak, but I would pass this to someone who has way more knowledge about car because my assumption may be totally wrong so experts and pros, come and help~
@steve99 @Shiv@Openflash would you mind take a look at his log & share your thought?? Sorry if I bug you~

[kodyo]

@nunonuna
Thanks, I'll look into it more this weekend and check for any leaks. Only intake mod I have is drop in and Perrin tube, so it shouldn't be acting that weird if it is. Other mods are 4.56 diff, ft86sf header, motiv over pipe, motiv carted front pipe, and Greddy sp elite axle back (along with OFT stage 1 93 Oct tune). Definitely a conservative setup.

If shiv or anyone else can advise, that would be awesome. I'll be checking for leaks this weekend. I can post another log if needed now that it's warmed up a bit outside. The log I took was also in a lot of stop and go traffic, if that means anything.

[nunonuna]

Originally Posted by kodyo

@nunonuna
Thanks, I'll look into it more this weekend and check for any leaks. Only intake mod I have is drop in and Perrin tube, so it shouldn't be acting that weird if it is. Other mods are 4.56 diff, ft86sf header, motiv over pipe, motiv carted front pipe, and Greddy sp elite axle back (along with OFT stage 1 93 Oct tune). Definitely a conservative setup.

If shiv or anyone else can advise, that would be awesome. I'll be checking for leaks this weekend. I can post another log if needed now that it's warmed up a bit outside. The log I took was also in a lot of stop and go traffic, if that means anything.

Hope you find your answer soon~ cheers

[kodyo]

Originally Posted by nunonuna

Hope you find your answer soon~ cheers

Did some searching, this may or may not have something to do with it (post from 2/18/15):

http://www.ft86club.com/forums/showthread.php?t=82655

Originally Posted by steve99

I think you guys were looking at the wrong knock type.

I think its more likely its the FLKC knock thats happening arround 5000 rpm and load 0.9 that is the issue you pulling -1 to -2 degrees just before and as the iam drops. The "Knock Correction" or FBKC in that log is very minor prior to the iam drop.

see extract from you log below
http://datazap.me/u/celadrielas/tune...zoom=4704-5199

fix you leak then see what it looks like, likely pull some timing around 5000 loads around 0.9

You could try the cam timing as suggested for the lower rpm lower load knock. or just pull about 0.7 out of the timing map. in that load rpm range.

Don't use "wideband afr" on oft unless you have changed the second o2 sensor to AEM and controller as it not calibrated for stock sensor. Use the front AFR sensor logs as "afr" and compare that to "afr commanded" that the ecu is targeting

Originally Posted by steve99

I would not take much notice of that Wideband afr value unless he has correct wideband sensor fitted, read my previois post, he needs to log just AFR on oft so it logs front sensor.

[NissanGuy]

Does anyone make a good OFT tune for this header? Cause I just checked the price on the FT86 tune, and damn.

[Cartman]

Originally Posted by NissanGuy

Does anyone make a good OFT tune for this header? Cause I just checked the price on the FT86 tune, and damn.

Well... an ECUTEK cable, dongle and licnece is 650 without a tune, so technically you're only paying 175 for the tune.

Best thing to do is get a used ECUTEK cable and dongle for cheap on ebay (I got mine for 175) then buy a licnece ($300) and load up OFT tunes, or have a tuner make you a custom tune, as ECUTEK is the main tuning software used.

With OFT you're limited to OFT tunes.

[nunonuna]

Originally Posted by NissanGuy

Does anyone make a good OFT tune for this header? Cause I just checked the price on the FT86 tune, and damn.

Why don't you visit OFT guys & do Dyno tuning since you live close to them?

[GrimmSpeed]

Originally Posted by NissanGuy

I admit I didn't re-tap the holes or use anti-seize, but I've actually replaced all the gaskets twice (lesson learned: Grimmspeed literally blows), and followed up with a smoke test to verify no leaks. Apparently this fault code (nominally for a stuffed cat) happens to a lot of people with this header.

Hey there! Just wanted to chime in with a response I just wrote to another member that applies here as well!

Originally Posted by GrimmSpeed

Hey man, sorry to hear that you're having trouble with your headers sealing!

With that said, I can absolutely promise you that the issue here isn't with our gaskets. We've sold tens of thousands of these gaskets and the only time when they don't seal well is when the two mating components have flange faces that are either a.) not flat or b.) not parallel. We know this because we also manufacture exhaust components and flange flatness and part 'warpage' are the major challenges.

One of the things that you might try is checking the header flanges for flatness individually and also between the two flanges. A lot of times just bolting them down will flatten any angular discrepancies between the flanges, but sometimes during welding, a header might pull just the right way and make that impossible.

In any case, I'd encourage you to continue using GrimmSpeed gaskets and to avoid double stacking them if possible. They aren't really meant to be a solution to fitment issues and sometimes double stacking will add enough thickness that other issues are created. In our experience, the guys at *** are awesome, so maybe it's just a worth a call to them for some help!

Best of luck and let us know if we can assist in any way.

Matt Beenen
Engineering

[nunonuna]

Originally Posted by Cartman

I plan on going to the dynojet where I did 186 tunned with the catted header and compare it.

Any update yet??