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Old 04-18-2022, 02:09 PM
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workingonit workingonit is offline
Join Date: May 2021
Location: DFW Texas
Posts: 527
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Originally Posted by RocketyMan View Post
On your MAF and in neutral with literally no engine load, what is your g/s on your MAF holding the engine RPM at exactly 1000 rpms? What about at 1500 rpms. Then what about at 2000 rpms.
I went outside to prepare my camper for my trip, and since I had to move the X5 aside to pull the trailer out of the garage, I grabbed these photos of my Torque Pro-dedicated phone in the X5.
Name:  the usual suspects.jpg
Views: 396
Size:  127.1 KB the usual suspects

Name:  MAF graph at 1k, 1.5k, 2k rpms.jpg
Views: 401
Size:  91.7 KB MAF graph at 1k, 1.5k, 2k rpms

I had trouble keeping the speed exactly on the marks of 1k, 1.5k, and 2k rpms, but it is close enough. 1k yields roughly 6 g/s, 1.5k yields about 8 g/s, and 2k rpm yields slightly over 10 grams per second.

Since a rule of thumb on a MAF's air flow rate at 500 rpm is 1 gram per second per liter of engine displacement (or 3g/s for my 3.0l), my graph is just about right at 6g/s at 1k rpms, a bit low at 1.5k rpms, and really low at 2k rpms (it should be 3x4=12 g/s). Am I reading this correctly? I did read the MAF momentarily, while driving at 70mph yesterday, it read 20+ g/s. I forgot the rpm, though.
'01 BMW X5-E53 3.0i (born 7/13/01)
topas-blau, Leder-Montana grau,
my new favorite project car

Plus four GM vehicles: 2 Daily Drivers, and 2 modified trucks (for hauling & camping):
3 Chevys:
'09 HHR Panel LS 2.2L,
'08 Cobalt Coupe LS 2.2L,
'04 Silverado 2500HD WT Reg. Cab
+ a '98 GMC Sierra 1500 Ext. Cab

- and 20 others, now gone, that I've had over the last 58 years (not counting the stillborn "1965 ChevyII altered/gasser project")
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