Nissan 370Z Forum - Uprev Osiris tuning questions

Nissan 370Z Forum (http://www.the370z.com/)

- Tuning (http://www.the370z.com/tuning/)

- - Uprev Osiris tuning questions (http://www.the370z.com/tuning/24356-uprev-osiris-tuning-questions.html)

any dyno number brfore and after a N/A tune? what kind of additional power (on the average) is being extracted by a custom tune on these cars?

Quote:

Originally Posted by Endgame (Post 752291)

What do you mean by "it's nearly impossible to get repeated good results from an eTune"? Are you talking about a canned etune that is sent to you (similar to Cobb's methodolgy)?

Please correct me if I am wrong, but I would think Uprev's data logging process, map tweaking, and upload on a car would be good. Certainly not the best option, but 'good enough'. Are we talking about the same thing? I think we are, but want to be sure.

Also, I just got my Cipher cable for datalogging. The only thing in the package was that; no software or anything. Is that right? I just plug the cable into the OBD port, the USB into the laptop, datalog, and send the files back via email or something?

And Sharif, I am very disapointed you have not posted more pics or vids of your race prepped Z!!!!!!!!!! Don't leave us hanging!!!!!

Back and forth datalogs can only tell you so much. They can tell you if the tune is safe. But without a way of measuring the outcome of the tuning changes, it's really impossible to know if/where you are making more power. The butt dyno is highly inaccurate, even moreso when trying to feel a power improvement in the 10-20 whp range which is typical with custom NA dyno tunes.

Now with a forced induction car, eTuning works really well, because in addition to the standard fuel, timing, cam tables that are optimized...we are also making the most important change with respect to power output: increasing the boost level. :) On some cars, it's not uncommon to see 50-100whp improvements from forced induction eTuning.

Quote:

Originally Posted by kevin8086 (Post 752397)

any dyno number brfore and after a N/A tune? what kind of additional power (on the average) is being extracted by a custom tune on these cars?

Every car is different, but we usually see anywhere from 12-22whp from dyno tuning the 370Z. It depends on the condition of the OEM ECU calibration that you walk in with, and how it's been adapting and responding to the mods on the car. For instance, if you are running extremely rich or extremely lean, the power gains we'll make will be extraordinary. If your walk in OEM calibration is closer to optimum, than I would expect a gain on the lower end of the scale.

I've seen a few NA cars come in with lots of mods, and AF ratios in the 14's at WOT! Talk about poor power, and high danger!

Thx Sharif. What about that Z race car!?!

Quote:

Originally Posted by Sharif@Forged (Post 752484)

I've seen a few NA cars come in with lots of mods, and AF ratios in the 14's at WOT! Talk about poor power, and high danger!

:iagree:

I've had to stop midway through the first pull because the wideband was showing mid 14's under full load at 4500!

i thought the computer is able to adapt to small mods. i just have the stillen intakes and thats it. shouldnt the computer be able to adjust for that? or are you talking about intake, headers, test pipes and cbe.

Quote:

Originally Posted by kevin8086 (Post 753272)

It adjust for stiochmetric conditions at idle and cruise. At WOT, the level of correction is much smaller even with the new OEM wideband sensors from the factory. This means the fixed base fuel table is still the critical map to have correct.

But if we have datalogged our normal driving and sprited runs, such as is requried with Uprev, would that not suffice for minor mods?

I would think it more critical to have a turbo car actually on the dyno that a simple bolt on mod NA car.

Quote:

Originally Posted by Endgame (Post 753494)

The problem is, we as tuners can't see the effects of our changes in real time. Say you send us a data log, and it shows you are way rich in the mid range, and some fuel needs to be taken out at those rpm cells. Sure, I can make an informed guess and get it close, but there is a chance it won't be perfect the first time.

Then you get into ignition timing, which is a whole other ball game. You cannot tune timing based on a data log without real time feedback from the dyno. Camshaft timing is the same way, the tuner needs to see if his changes are making a positive change or not, based on dyno feedback.

i would always recommend a tune in person vs a mail in tune. i never really bothered with N/A cars but all my turbo cars have always been dyno the street tuned, there is no other proper way imho.

My FI cars (supercharged Stang GT / SR20DET S13) were always dyno tuned. I feel comfortable with the mail in tunes. I do not really have a choice anyway.... I am not going to SRD in AZ and trusting them with my Z. That is a Honda shop and they have messed up several Nissans that I have seen in person. WOW.

Chris, I think you hit it; you may not get it right the first time, so it could take several tweaks. If I did have a reputable Uprev tuner in AZ, I would be all over it...

Quote:

Originally Posted by Endgame (Post 754650)

come to texas, uprev is here in austin and you can have some great BBQ plus you can try out the roads in the hill country which will really make your drive worth it.

Actually, I am in Austin a lot due to business! But I unfortunately have no where near the time to drive my Z there. To bad.... I am very jealous of your hills...

Now, about that BBQ... Where can I go for good BBQ in Austin!??! Please share so that I can try it when I am there again!!

Quote:

Originally Posted by Endgame (Post 758680)

Mmm....BBQ
http://blog.oregonlive.com/news_impa...omer.drool.jpg

^ Homer Simpson FTW!!