Interesting. Looks like it's option 3. Something between the time you did your first wb sensor test and the time you did the dyno changed your a/f ratio.

Can you use emanage to return the numbers back to 12:5 - 13:2? Then, drive for a couple of months and see if it stays that way or goes back to 11s?

And, can you figure out if there is anything you might have done to have changed the a/f ratio?

Keep us updated because this is very interesting data. Thanks.

 

Well, there was nothing that physically changed between the time I did the previous WOT runs back in September and today. I can definitely tune the eManage map back up to the 12's, but it's just strange how it changed itself. I think that today when I get home I'll reset the ECU and then see if that causes the Z to go into one of the more aggressive timing maps as Clint (THX) pointed out. Maybe that is what caused the A/F to change? Maybe I was running in one of the more aggressive timing maps when I first tuned my eManage (since I had reset the ECU to install it) which showed me in the 12.5 range and between then and now the timing map changed to the "safe" timing map which richened up the mixture? Who knows.

Guess I'll find out soon enough.

-Chris

 

I have all the charts in winpep format, but would rather distribute them to each person to post up themselves if they wish. Doing a screencap, resizing, and hosting all of these runs would be quite a project. I'll gladly send these to anyone who'd like to take that on.

Besides, the charts really wouldn't show much unless you put them on top of eachother to show differences between cars or baseline runs. I can surely do some individual requests like that.

 

Here's an interesting one...

All three of these are stock Z's (two 04's and a single 05) making about the same power within the margin of error.

However, the 05 one (green line) seems like it's got a richer map than the other 04's.

 

ooh. Someone with an 05 lean that thing out and see what hp it makes

 

Wow, after reading through this thread I can imagine why some of you guys might be disapointed with the #'s. Makes me wonder how I would have reacted if I got #'s that were not up to my expectations.

Hopefully the next run will have more favorable weather and everyone can compare dyno's again.

 

cHRIS LEAVE IT ALONG YOUR RUNNING PERFECT FOR A tWIN TURBO. J/K

According to Tadashi the Nissan runs best on the leanside of "perfect".

 

Well, I reset my ECU and was able to get in a couple more WOT runs on the way back to work again and the results are quite interesting. Below are the graphs of both WOT runs yesterday as well as the ones today after resetting my ECU. They are virtually identical +- .2!

Looks like it may just be a case of adjusting the numbers on the eManage to get into the good range again.

-Chris

 

That is correct. However, Im not making the HP that I want. Rolling on 19s suck. Anyhow, heres my pretty graph.

 

Eh...how come the WinPEP7's number shows different from my print out when I set it to SAE corrected?

 

What graph?

 

 

I mentioned that earlier. Steve did not print SEA corrected graphs for us. He printed STD corrected which shows a higher Max HP number. When I SAE corrected my graph it brought it down to 239 like yours. Least we know that our Widebands work

Your A/F looks a little on the lean side. Have you tuned your SAFC yet?

-Chris

 

Oh I see.

Yeah I have richen it a little after the dyno...

 

Do any of you have the actual Dynojet run files to post?

Also that nitrous A/F graph looks terrible. How is this dry shot setup?

Dyno posting etiquette is to post all numbers in SAE correction and make the runs in the closest gear ratio to 1:1. Which is 4th gear in these cars.

 

That is a common margin of error on VQ35s. Most of the time it is due to the MAF signals being wrong. This is why A/F tuning on a VQ35 is imperitive, even on some stock vehicles. Also note that ANY changes made to the induction on this engine can throw off the A/F and actually fool the MAF into reading higher or lower than it's supposed to. The ideal A/F for a NA VQ35 is between 13.0-13.5 for most vehicles.

 

SR20 - 5th gear is 1:1 in manual Z's.

 

Read through the whole thread and you will see that some of us have posted our dynojet graphs.

-Chris

 

Oops... you're right.

 

I am not blind. I see pictures of graphs everywhere. I merely asked for actual run files, not pictures of run graphs. Sorry for the confusion.