Quote:
Originally Posted by MetroMPG
I've had several people ask me by email how to ID an XFi motor. Is there any easy way to do specifically that? I'm not sure.
The vehicle differences I'm aware of are:
- different camshaft (lower lift & duration)
- number of piston rings (2 vs 3)
- possibly smaller throttle body throat diameter
- different ECU
- taller final drive
- no A/C
- no passenger mirror
- XFi badge on hatchback
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Here's a more Technical breakdown of the differences....
Camshaft
XFI Model
Standard camshaft lobe height is 39.628 to 39.788 mm
(1.5602 to 1.5665 inches).
Wear limit 39.528 (1.5562 inches).
Base and LSI Models
Standard camshaft lobe height is 40.415 to 40.575 mm
(1.5911 to 1.5974 inches).
Wear limit 40.315 mm (1.5872 inches).
Final Drive Gear Ratio
Base Model - 4.10
XFI - 3.79
ECU
No numbers (yet).
XFi ECU Timing calibrated to match the XFi camshaft.
VIN Number
VIN number has MS instead of MR at the beginning.
Only the XFi model had MS so that is one way to tell that it started out as an XFi. Doesn't mean it still has the factory motor though...
Bumper Cover Trim
XFi gets Flat black upper bumper cover trim.
Base model gets body color on the bumper covers.
WEIGHT
XFI less due to no A/C
MPG/HP Ratings
XFi was rated at 53/58 US mpg city/hwy - 15%/18% better than a base model 3-cylinder, 5-speed Metro (46/49 mpg)