i just got back from a local dyno day, and i have some disappointing results. as my sig indicates i have intake,plenum,cats,exhaust and my original baseline was 225hp. the best i did was 233hp, but obviously its cause im running super lean. i guess its time to call technosquare. i have a question though about the ecu flash. i plan on getting headers and possibly nitrous, so would i need a different flash to incorporate those mods or not? tia.

 

Ask them when the last time they calibrated their Wideband A/F meter setup was. Your sig indicates you have an AEM wideband. Does it read similar results? I'd say those A/F numbers are suspect, but I suppose it's possible.

Did other cars dynoing that day get lean results as well?

 

There has to some thing wrong with that o2 senser . The dyno operater should have abandon the run as soon as he saw that A/F ratio so high early in the run the first time .He shouldnt even have let you do a 2nd and 3rd run with out checking his senser

 

i didnt cross refrence the aem wideband with theirs, but i def. shouldve. i still have to change the settings on the aem anyways. but i'm pretty sure that their wideband is/was accurate, cause none of the other cars ran lean and they said they just had it replaced/recalibrated.

 

I agree something is wrong with this dyno/wideband. I have a pop-charger/plenum/test-pipes/injen ses and my a/f's were 13:1 across the board slowly getting richer by redline where I was around 12.5:1....and I have a stock ECU

 

any idea as to why your torque readings are so high on the first 2 but it drops down to 230 on the last, or does that say 280?

 

Man, I thought I was lean, but that is insane. So insane, that I suspect it is incorrect. Now, I don't know much about dynoes, but that looks really suspect. Where was the sniffer placed? In the tail pipe or in a cat/header bung?

I essentially have the same mods you do, but my A/F was not nearly as bad. Sure it could use fixing, but not that much. Personally, I would hit the dyno again and have your AEM setup log the results of the A/F. Then, compare them to the dyno. If they are accurate and that high, get the TS ECU flash or something else to correct your A/F.

 

I wouldn't go back to the same dyno though. Find another one with a A/F metering device.

 

either way i need to flash my ecu, because with the mods i have i should be getting better than 8hp over stock!!

 

so much torque, so little HP.... what the hell?

 

Don't trust the trq #'s before 6sec.

 

If your a/f was that lean I bet you would be getting a CEL, so I would bet either they didn't run the o2 hose far enough or the calibration was off on there Dyno.

 

to answer some questions I think... he must have an auto, thus the low hp base and modded.

and the torque is coming in at the bottom from the torque converter I think. the 3rd pull is screwed up in that the first 6 seconds is displaced for whatever reason.

 

If he is placing the A/F prob in your tailpipe and are running cats, the A/F numbers will be articifically lean...in a big way.

Hey, why do you have to calibrate your AEM? There is no calibration setting as long as you use the standard AEM O2 probe. The program should be set to P0 which is the default setting. You only need to change it if you run something other than gasoline, or if you use a different probe.

 

Definitely an Auto, that's whey the low end torque is so high.

It looks like maybe it started in a lower gear on the third run, and then downshifted partway through to the same gear as in the other runs (why the torque starts off lower but then jumps back up).

Since you have the wideband gauge, maybe to a couple acceleration runs on the highway and see if the numbers on your gauge compare with those @ the dyno.

-D'oh!

 

You may be sucking air one one or both of your center plenum screws. Put some water in the two center holes and have someone "blip" the motor. If the water disappears, you may have a crack at that area. I had a crack at the center FRONT screw, the power loss was very noticeble. Kinetix sent me a new Plenum RIGHT AWAY. Now my car rips! And, by the way Technosquare can mod your ECU before or after headers, they will just add a little fuel at the "big end". It's better to add all your mods and then reflash. But, High Flow Cats have been known to make you run lean in mid RPM area. Won't harm the engine though, just don't beat on it until you reflash. Belive me, the relash pulls it all together.

 

If there is another Z in the area see if he/she will let you use there MAF sensor on the dyno. Try a different shop dyno once with your current setup, then if still lean swap MAF's. This has happened on a buddy of mine Maxima 3.5l. Its a possibility...

 

Lol, you dont need a ecu mod, you need to go to a better a/f system. if you were running 18:1 ration at 5000 rpm like that says, you would not have motor.

 

yea i just spoke with the dyno, and it turns out that there wideband is indeed broken/malfunctioning. however, i still have the problem of having nearly two grand in bolt-ons and about 8hp to show for it, so the ecu flash is gonna happen regardless; god i hate the stock ecu!!

 

have you overlayed your stock dynos to the modded dynos? Peak power isn't all that matters. You could have gained quite a bit throughout the curve and just not seen it without an overlay. If there isn't any gains then I would be upset myself.