O2 sensor backups have been recommended for a couple years now. With the latest round of guys getting headers done, it's come back to the forefront with so many guys busting their O2 sensors. 2010 and below use different pre cat O2 sensors than 2011's and up. Biggest issue I ran in to is the guys who extended my O2 wires crossed some of the connections (also flip flopped the locations; Precat was in J tube, post cat was in free stream)... I went through 3 sensors before figuring out what they did. I don't believe you have to extend the sensors on these correct? Other common issues are stripping the threads or damaging the sensors it's self just trying to remove it through brute force or air tools. If you or a shop is doing these, make sure they are removed before attacking it with air tools.

I have trouble changing battery in smoke alarm in hallway. I leave this stuff to the professionals

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i agree with the o2 sensor.. my car was stuck at the shop for 5 days because of the o2 sensor... Canada was all out of stock.

btw,
is anyone having trouble with the exhaust hitting the rear sway bar? i had it readjusted twice now and changed all hangers. Seems like the test pipe and y pipe made the whole exhaust sit higher.

So nervous just waiting......and there is nothing on tv..

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Driving up at 12:30 to film the dyno tuning session. Considering my original dyno tune was jan 4th and 47 degrees I'm guessing being that its much warmer than that today I wont be dissapointed if the numbers arent great.


I guess we'll see....

Provided no problems or delays should have results up by around 3pm. Later

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Good luck man.

My results
 

it was indeed 90s today during the dyno however judging by numbers alone I'm a bit depressed.

my dyno from jan 4th this year, 47 degress with everything except z1 headers, AAM test pipes:

317whp, 266 wtq

today, 90s something:

321 whp, 257tq

so, gained 4 hp, lost 9 wtq

comparing these is difficult though because of the difference in temps. anyway though it is what it is:


I had to drive home in rush hour traffic so couldn't really get on it too much but some worthwhile observations:

the smell, didn't notice at all. I thought I was supposed to smell gas/fumes with test pipes, I guess you can slightly but nothing like I expected.

at idle and low throttle hard to even tell it sounds any different when it didn't have the headers or the test pipes. start laying on the throttle and it becomes noticeably cool sounding ;) I try to grab some internal audio tommorow for those interested.

Butt dyno - couldn't really get into much coming home so I can't really say yet. I don't like that my TQ numbers are down but just from driving eh, can't tell but I didn't really lay into it yet.

overall:
I'm bummed at the present time. I will take it up to capital drag this weekend and hope it stays in the 90s because I know before the headers and test pipes the heat affected the quarter from 12.9 108 to 13.2-13.5 from 105 down to 103 for the trap so if it stays this hot I should have a decent comparison judging how it does in 90s heat vs 70s and 80s at the track.

anyway sorry if I bum anyone out. right now I'm thinking probably not worth the investment but I'll give it some time to grow on me. It certains sounds better and surprisingly it isn't obnoxious unless you start really getting on it and even though not really unless noise frightens you ;)

not even gonna take them time to take a pic of the dyno, but if someone really wants to see it I will but I'm just not happy enough to put it up right now.

Peace

Dang. Maybe the revised Z1 versions are not 100% identical to Momentum? Any one else planning to dyno Z1s version?

Did it make power else where and not just peak hp/tq? I was pretty bummed about my tune and dyno in 86 degrees until I looked at the sheets. I made power everywhere and just a tad bit up top.

All of your dissatisfaction is due to the ambient temps. Go re-dyno in similar conditions for a true comparison.

wow, sounds sick! thx

what he said!

I believe we are all getting tied up in peak HP, myself included, when they told me I was just over 320 whp, I was shocked, I was expecting 330ish...My final run was at 82 degrees, and I also remembered that I had the m370 on, as do you I see, which lose peak HP. Seach around the forum, most say we would gain 5-10 hp from ditching the manifold. Peak HP is just a dumb number, how long is your car at the peak HP spot? I rather gain 10 whp under the curve vs 15 or even 20 peak hp...I plan on doing some power pulls on a local dyno in the fall without the m370, I bet my numbers will be darn good with cooler air, the "internet standard" is 1% power per 10 degrees, so to "estimate" your current power level with your 47 degrees number(lets say 40 degrees and 4 % difference), 321 x 1.04 = 333... bingo!

with that said, I crushed your tq # ;) just saying!

Man, I love the sound of that exhaust. Do you have a lot of rasp? I put ART's on my FI and it made it sound raw which I like, but I do get some slight rasp from them.

I haven't compared the sheets yet but I'll post it tommorow but it looks like maybe a build WTQ faster or in a steeper curve. I did drive it a bit to see how much louder under full throttle. not obnoxious but louder than before in the attached video. after driving a bit and stomping on it a bit it feels really good. whether faster who knows but it does feel good.

No rasp that I know of... But this is my first import and I'm a dummy when it comes to them. But I love the car itself. Thank you guys for the nice comments on the sound. Not really knowing what all is out there I was thinking maybe I would get ran in the dirt. 370z forum has some great people. Look forward to learning from you guys.

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