Miata Turbo Forum - Boost cars, acquire cats.
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Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   Engine Performance (https://www.miataturbo.net/engine-performance-56/)
-   -   Matt's Car - Had a problem...or 4!!! (https://www.miataturbo.net/engine-performance-56/matts-car-had-problem-4-a-30995/)

Toddcod Feb 5, 2009 11:08 AM
Originally Posted by Savington (Post 363642)
I can tune my car at 2am in 35 degree weather and it runs 10.9-11.1 during 4th and 5th gear pulls. I can then take that same tune and go pounding around CalSpeed in 80 degree weather, redlining 5th and 6th, and the wideband is pinned at 10.9-11.0.
What, my car is different with temperature change. What are your settings.

hustler Feb 5, 2009 11:31 AM
Originally Posted by Toddcod (Post 363751)
What, my car is different with temperature change. What are your settings.
easytherm.

Stephanie Turner Feb 5, 2009 11:33 AM
Originally Posted by Savington (Post 363642)
What I can't understand is why you see a one point discrepancy between the dyno and the street, and nobody else does.
I wish I could explain it, but I can't. Our dyno does not log boost pressure, so maybe that has something to do with it.
Stephanie

Stephanie Turner Feb 5, 2009 11:36 AM
Originally Posted by y8s (Post 363565)
the tune should accommodate changes in ambient atmospheric conditions via air temp sensors and coolant temp sensors.
Remember the Xede is not a standalone. With the standard Xede, it does not have a extra correction based on those factors. It could, but 99% of people do not use it. The stock ECU corrects for those factors.
Stephanie

Savington Feb 5, 2009 02:32 PM
Steph, doesn't the Xede use pressure+temperature to calculate air density?

Stephanie Turner Feb 5, 2009 11:40 PM
Originally Posted by Savington (Post 363871)
Steph, doesn't the Xede use pressure+temperature to calculate air density?
Nope, it relies on the stock ECU for those functions. The Xede will control fuel, timing, O2 sensor, TPS, WB O2 integration, boost solenoid, and a few other analog inputs you can think of. But it's corrections are based off of the MAF and engine loads.
Stephanie

Stephanie Turner Feb 5, 2009 11:58 PM
1 Attachment(s)
Originally Posted by patsmx5 (Post 363424)
I don't know how his timing map was tuned.

Anyways, I'm interested to see the timing map he was running.
Here is a copy of the map. It is about mid-range to aggressive on the timing scale of things. What is in the map is the degree of advancement or retard to factory settings.
Stephanie

ArtieParty Feb 6, 2009 07:46 AM
Whats the scale on the left side (y axis)? I get the rpms are on the bottom, but whats the side? kpa?

Stephanie Turner Feb 6, 2009 10:34 AM
The Y axis is engine load.
Stephanie

ArtieParty Feb 6, 2009 04:43 PM
Engine load? What sensor gives you those values? What unit is that is?

patsmx5 Feb 6, 2009 04:46 PM
Originally Posted by ArtieParty (Post 364556)
Engine load? What sensor gives you those values? What unit is that is?
Doesn't matter, you still can't figure out what the actual timing he was running is. It varies depending on whatever the stock ECU felt like running. I was hoping for a map with PSIA and RPM for axis and the actual total advance for a number.

hustler Feb 6, 2009 05:32 PM
paging johnwag who knows the stock timing #'s by heart.


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