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Old 06-15-2009, 08:02 PM   #1
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Do these figures look normal?

THIS IS THE DATA I GOT DOING 3 LEVELS OF DRIVING.

Crusing (1500-2000RPM)

Coolant Temp: 170°F
STFT Bank 1: 2.3%
Manifold pressure: 12.2 in.hg
Intake temp: 77°F
MAFS flow: 0.8 lb/ft


Highway (2500-3000RPM)

Coolant temp: 188°F
STFT Bank 1: -2.3%
Manifold pressure: 20.4 in.hg
Intake temp 75°F
MAFS flow: 2.9 lb/min


High RPM Highway (5000RPM+)

Coolant temp: 183°F
STFT: 0%
Manifold pressure: 29.7 in.hg
Intake temp: 77°F
MAFS flow: 16 lb/min


AVERAGE IDLE: 645-650RPM

I think I remember Tom saying he puts his RPM setting to 850 on the tunes.. My idle seems really low to me.


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Old 06-15-2009, 08:18 PM   #2
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650rpm at Idle does seem a bit low to me. I don't like to see anything below 750rpm but I'm sure it's just the stock tune doing it's thing.

The IAT's look good with that CAI. Coolant temp also looks good.

Next time you datalog, be sure to check the spark advance and get one of when you snap the throttle for my own curiosity. I know the EEC-V programming of the ford ECUs love to immediately retard the ignition timing when you snap the throttle at low rpm, just curious if they've changed that with the drive-by-wire design now.

I would say this is probably better fit for the tuning chat.
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Old 06-15-2009, 08:20 PM   #3
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Ahh OK, there was more info but it was tough logging.. I don't have my X3 yet so I had to tell my GF things to write down while I got them on the OBD-II reader lol. My X3 should be in the mail soon!! And yeah, the 650 does seem low.. You think there might be a vaccum leak? Or would I notice way harsher symptoms with the idle?
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Old 06-15-2009, 08:32 PM   #4
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You would notice much harsher symptoms at idle if there was a vacuum leak. The car could stall out if it's sucking in un-metered air. As long as it's idling smooth at that rpm and not diping, it's fine. It's probably just the factory tune doing what's comfortable to it.

If it spits and sputters, or starts dipping lower, it could be the stock tune trying to counter and compensate for the CAI and so forth. In which case, It might be time for a tune, but for now, it seems fine.

Once, you have your Xcal3, you'll have many more options for datalogging. A good base for datalogging is the following...

EGT
IAT
injector_pressure_drop
throttle_position_relative
analog 1 *optional* (if you have a wideband)
load
maf volts
borderline spark
MBT spark
sparkadvance or spark
rpm
car speed

That should give you a good datalog and allow you to really see what your car is doing going down the road. I'm not sure if the Xcal3 has all of these, I use livelink with the Xcal2, but I'm sure it'll at least have these.
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Old 06-15-2009, 08:36 PM   #5
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Thanks for all that info SMITH, I will have a wideband in before I get the tune. Just waiting for it to get here. My car doesn't sputter persay at idle, but when it's in Drive and I just have my foot on the brake the car dips.. The car shakes a bit. But like you said that's probably the ECU compensating for the CAI. I'm really looking forward to the tune to increase the smoothness of everything. I'm curious about the PSI increase on the tranny too.
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Old 06-15-2009, 09:58 PM   #6
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oh its an auto! well then the idle speed seems more normal.

what is your idle speed when in neutral?
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Old 06-16-2009, 06:47 AM   #7
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Yeah, if it was a manual, then I'd say 650rpm would be a bit low, but for auto, the torque converter is holding it fine.
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Old 06-16-2009, 07:51 AM   #8
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Yes we will raise the idle

His list looks good but no need for MBT , borderline , or speed

Tom
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Old 06-16-2009, 08:52 AM   #9
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Thanks for the input guys. Looking forward to have the X3 Tom!
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