I have upgraded to V2.8 in my Utec, and I have noticed a wired problem. I don't know if this has to do with the Elevation of Colorado, but when i switch to stock map, "my car runs from 11.9 to 13.1 when i push it hard" and 14.4 to 14.8 when i drive normal. Then I have uploaded my map, which it should be making 273whp but I noticed that my car runs 16.8 to 17.8 when i push it hard and 14.5 when i drive normal and i can feel that I’m losing a lot of power .

My background about the Utec is basic, do i have to do anything after I have uploaded my map. My friend told me before that I need to set the OLF <- something like that .

 

Are you using the MAP sensor, or using the MAF table?

 

How do I know ?

 

??

 

Call Nick at MAC Autosport.

 

MAF = Mass Air Flow. It's measured in volts. This parameter is only used when MAF is selected as the Load Indicator in the Open Loop Fuelling Parameters Menu.

MAP = Manifold Absolute Pressure. It's measured in PSI. You'll need a separate sensor for this function and is usually used with FI installations. This parameter is only used when MAP is selected as the Load Indicator in the Open Loop Fuelling Parameters Menu.

 

I will look for that thanks

 

lol are you saying you didn't read the manual??

 

map 0 is not stock map, its not even close.



i am still not even sure why they call it stock map. it will run very rich.

 

Both MAF and MAP sensors OUTPUT is measured in volts (0-5vdc typically). The MAF measures air flow (the quantity of air passing by the sensor), the MAP measures vacuum/pressure compared to ambient.

 

TurboXS states in their 350z UTEC manual Page 31,

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"MAF value for mapping is the Mass Air Flow value in Volts for the MAF referenced load columns in the fuel and timing maps (the 10% column)."

Load values for MAF tuning are measured in terms of Volts. The range is 0 to 5.0 Volts = (0 to 30 AFR).

==================================

"MAP value for mapping is the Manifold Absolute Pressure value in PSI for the MAP referenced load columns in the fuel and timing maps (the 10% column)."

Load values for MAP tuning are measured in terms of PSI relative to (1) atmosphere. It never measures vacuum, only positive PSI. The range is 0 to 32 PSI...

 

It is meant for more of diagnostic use stock mode is more like stock like mode. Technically we are only passing the ecu signals through the vehicle without any manipulation. Anytime you run the car in map 1-5 with open loop fueling the factory ecu knows because it is trying to trim the fuel under what it knows as closed loop. The trims can be applied to applied to open loop. Which would make the car run pretty crappy.

 

The MAF doesn't read volts though, you don't have any volts going through your intake. The sensor output is IN volts, which corresponds to how much air is going through the intake at a given time. The unit of measure is NOT volts, it is probably something like SCFMs or SCCMs.

Example:

MAF - Reads 0-100 SCFM (standard cubic feet/minute) Outputs 0-5 volts
MAP - Reads -14-28 PSI Outputs 0-5 volts

Other examples would be the throttle pedal. Its output is 0-5 volts but it measures postion between 0-100%

 

okay, I tried to work this around, but my car still running rich. I have uploaded my maps, and i took some screen shots from my Utec setting. please tell me what to change.

 

That map is extremely lean for stock injectors above 4k RPM and running way way too much timing for 91 octane gas. Where did that map come from?

 

my friend did it for me long time ago on Utec V2.3. I'm sure it wan't like that, but after i uploaded it to Utec V2.8 that's what i got. I was make 273whp on that map, but no more

 

That's really surprising -- your map has got a good +5-6 degrees of timing and -4 to -5% over fuel over what I'm able to run in CA on 91 octane on 2.8d firmware with similar mods. Obviously, there's going to be pretty significant variation in engines and altitude, but I would just completely re-tune at this point.

 

i thought so