Cobb AccessPort for 370Z!

Denny McLain

The AccessPort for whatever reasons takes out midrange timing on its own. 1-3 degrees between 4500 and 6000.

After spending a whole bunch of time trying to tie the strings together to no avail, finally figured out there is nothing you can do to effect the timing with the AccessPort. Think (the key word is "think") temps do play a role as the timing did vary, but doing anything that is controlled by the end user of the AccessPort was non-existent for me. Cobb confirmed the timing did nothing also.

Good luck on the tune, if you can get it to work your certainly a better man than me or Calvin whom is the tuner at Cobb as it didn't it to click for him either.

HP Logic

...Bingo....the car does have Dynamic timing control....on multiple redundant levels...

I have tested temp based timing control on the 370z with variable resistors and have made great progress in maintaining timing....I relayed my findings to Cobb the very first day the AP was in my hands....all we can really do now is wait and hope these definitions make it to the Tuner software for the end-user to have access to.

-Jack

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Jack Cecil
HorsepowerLogic.com

Denny McLain

Does that mean you were able to make it stop pulling out timing in that range AFTER you used AccessPort to tune using the resisters?

Right now using a homemade ram air to the Stillen G3 filters and heat barrier wrapped G3 tubes. There are four layers around each MAF.


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The intake temps are as close as 3 degrees over ambient on a cool motor during open throttle. In normal driving the intake temps stabilize to only over 8 degrees over ambient. In addition, with the GTM oil cooler my oil temps in normal driving do not go over 192 degrees and water temps are typically about 5 degrees below that.

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The last log session is what was posted prior whereby the car did pick up overall timing in 72 ambient weather and 183 water temps, however there is still a dip in the mid range as you can see in the timing table.

Exactly how many hoops do you have to jump through and what in the hell is Nissan thinking if that is the case? Just don't see the average user going as far as I did to stabilize temps, yet it still pulls out timing. SAE conditions are 67 degrees and 29.61 barometric pressure and just isn't that far off.

Or........When comparing baseline dyno to Cobb tuning the car pulls out midrange timing and did not do it before. Still think the AcessPort induced the midrange fallout and Nissan for the overall timing loss in higher temps.


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