Cobb MAF Calibration help

Denny McLain · 10-13-2009, 02:13 PM

Even though my car is in the paint shop, trying to do a little homework to calibrate the MAF settings. Does anyone have a stock intake MAF log of 2500-3000 rpm and up they can share with me? Also, those with the Cobb AccessPort......are you able to connect your laptop directly to the ECU to do logs? For some reason in trying to get the two to communicate, keep getting communication errors preventing me from logging short and long term fuel trims. Might have to call Cobb for help if I'm a Lone Ranger as Calvin at Cobb did use his laptop for logs.

Anything upstream of the MAF (Like a Stillen Gen 3 intake) can skew the reading plus there is a probability of MAF production error so I'm trying to figure out exactly what is going on. One side shows more voltage at the same rpm (as much as .06 volts in numerous points) than the other side through 85% of the power band. Suspect it's the Gen 3 intake vs MAF variance.

Also the logged Grams per Second using the AccessPort is much higher than the stock MAF table but leery because the log table stops at 268 grams per second (5900 rpm). Btw... it is both sides added together. How do you fine tune if it stops giving ya data above 5900?? Does the laptop log do the same??

Lastly, the software has MAF calibration A and B while the log itself shows B1 and B2. Going to swap MAF's from left to right to see if it follows but anyone know how A and B matches up with B1 and B2?

A stock table would be a good starting point. Thanks in advance!!

Denny McLain · 10-13-2009, 02:37 PM

Maybe a visual would help a bit.

Denny McLain · 10-13-2009, 02:41 PM

Quote:

Originally Posted by Denny McLain

Maybe a visual would help a bit.

Maybe it won't, didn't upload. Oh well, there goes the neighborhood again.

Valentino · 10-14-2009, 12:16 AM

I still haven't plugged the AP to the car yet. The AccessTUNER Race doesn't work on my MAC (with windows)! but the AP manger works. I'll play with it tomorrow and report back.

Denny McLain · 10-14-2009, 08:11 AM

Quote:

Originally Posted by Valentino

I still haven't plugged the AP to the car yet. The AccessTUNER Race doesn't work on my MAC (with windows)! but the AP manger works. I'll play with it tomorrow and report back.

Would very much appreciate it.

May also have to take the car somewhere that has a Tech 2 to get an accurate higher rpm MAF log plus it would provide another readout to compare the AccessPort readings to. As mentioned, the AccessPort 02 readings are helter skelter below 4000 rpm, but consistently .7 to .9 below RPM's dynojet wideband above 4000.

The car should be back Friday from the body shop and will call Cobb to see if they can help me connect the laptop directly to the ECU or get a definitive answer that it still doesn't work.

An issue and this may or may not effect a MAC (know very little about them) is I have a laptop and a main computer with Vista 64 which the AccessTUNER is not compatible with. Fortunately had a spare laptop with Vista 32 or I'd be completely SOL.

Thanks again.

10-13-2009, 02:13 PM	#1 (permalink)
Denny McLain Enthusiast Member Join Date: Feb 2009 Location: Double Oak Tx Posts: 255 Drives: 370Z, 96CE hotrod Rep Power: 16	Cobb MAF Calibration help Even though my car is in the paint shop, trying to do a little homework to calibrate the MAF settings. Does anyone have a stock intake MAF log of 2500-3000 rpm and up they can share with me? Also, those with the Cobb AccessPort......are you able to connect your laptop directly to the ECU to do logs? For some reason in trying to get the two to communicate, keep getting communication errors preventing me from logging short and long term fuel trims. Might have to call Cobb for help if I'm a Lone Ranger as Calvin at Cobb did use his laptop for logs. Anything upstream of the MAF (Like a Stillen Gen 3 intake) can skew the reading plus there is a probability of MAF production error so I'm trying to figure out exactly what is going on. One side shows more voltage at the same rpm (as much as .06 volts in numerous points) than the other side through 85% of the power band. Suspect it's the Gen 3 intake vs MAF variance. Also the logged Grams per Second using the AccessPort is much higher than the stock MAF table but leery because the log table stops at 268 grams per second (5900 rpm). Btw... it is both sides added together. How do you fine tune if it stops giving ya data above 5900?? Does the laptop log do the same?? Lastly, the software has MAF calibration A and B while the log itself shows B1 and B2. Going to swap MAF's from left to right to see if it follows but anyone know how A and B matches up with B1 and B2? A stock table would be a good starting point. Thanks in advance!!

10-14-2009, 12:16 AM	#4 (permalink)
Valentino Enthusiast Member Join Date: Jan 2009 Location: RaceTrack Posts: 349 Drives: SOLD 09,370z,M6 Rep Power: 305	I still haven't plugged the AP to the car yet. The AccessTUNER Race doesn't work on my MAC (with windows)! but the AP manger works. I'll play with it tomorrow and report back. __________________ Lou Fusz Nissan \| KW V3 \| SPL rear camber and toe bolt \| OS Giken LSD \| Nismo Diff cover \| Engine Oil cooler \| F.I. TDX Cat Back 18" Resonators \| F.I. Resonated Test Pipes \| Injen cold air intake \| COBB AccessPORT \| JWT Clutch Flywheel \|

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10-13-2009, 02:37 PM	#2 (permalink)
Denny McLain Enthusiast Member Join Date: Feb 2009 Location: Double Oak Tx Posts: 255 Drives: 370Z, 96CE hotrod Rep Power: 16	Maybe a visual would help a bit.