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Discussion Starter #1
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i just dynoed my car at nopi this weekend jic exhaust bullet ( no y- pipe) gutted cats and nismo intake 235 whp and 232 tq my air fuel was all messed up though the guy said that its right lean see what yall think
 

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Which JIC exhaust? Was it Type 1 or Type 2, as in single or dual exhaust tip?
Do you have any dynos before the upgrade? it's impossible to tell the gains if you don't have one.

By the way, the photos are so blured (out of focus) I can't read a thing.
 

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Discussion Starter #3
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it is the single one the bullet, no dyno before, and the pics are in focus but for some reason when i post on here they get fuzzy as **** the hp says 234-235 on every run and the air fuel is just crazy it goes almost to 17 - 1 air fuel seems awful lean to me but the top line on the right is 17 then 16 and so on
 

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I doubt that the A/F readings are accurate. If they just shoved a sniffer in your tailpipe, don't count on that being accurate. Frequently, they are not. Furthermore, they can be made worse by a tech no sticking the sniffer in deep enough.

Also, keep in mind dynos are really not that accurate. If you want to get good tuning information out of them, always go to the same dyno. Between machines, the difference can be too great.

Also, investment in a good datalogging wideband sensor would be good if you plan some serious tuning. I would recommend the M400 from www.plxdevices.com or and R-500 if you want something really trick.
 

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I would try to find a dyno, because air fuel ratio of 17 sounds very very high, if you are N/A it should be around mid 13s. I'm surprised that your car isn't overheating and you are not getting any detonation. It's very bad for the engine. Also what is the lowest reading for the A/F chart? Is it 14? I would guess that you are running lean, maybe around 14-15, but it's definitely not 17. I would find another dyno and get another run, with and without the exhaust, then you can see how much power you have gained. There can be a lot of difference between dynos like Peptidbond has mentioned. So the other dyno graphs on the boards are useless, unless they have been made on the same day as you and on the same dyno. Don't worry about the CAI, it's not going to make that much difference.

As for the images, you might want to make them smaller and save them as GIF instead of JPG. See if that works better.
 

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Discussion Starter #6
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thanx i just ran it for the **** of it at the nopi show i know that there is no way that the a/f is that lean my motor wouldnt survive, i run the **** out of it day to day and i tracked it four times that day but the horsepower seems low, but like u said everydyno is diff, and i dont have enough done for my a/f to be that messed they did just put it at the end of the exhaust but it seemed to work good for everyone else, everyone has said that test pipes dont set off a cel but when i gutted my cats it set mine off at like 50-100 miles somewere near there but haveing them gutted should do the same as test pipes, how about a aem wideband i was thinking about that car runs great no detonation
 

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AEM is a good choice, but i'm not sure if it has any data logging. The above mentioned unit has, so all you have to do is drive around and view the logs later. With AEM, you have to keep your eye on it to know what the mixture is like.
 
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