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Old 12-01-2007, 10:53 PM   #1 (permalink)
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How to tell an XFi from a garden variety Metro

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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Old 12-01-2007, 10:54 PM   #2 (permalink)
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
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So the challenge then is: what would be the easiest way to know whether you were looking at an actual XFi, or a garden variety Metro with an XFi hatchback (badge) transplant?
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Old 12-01-2007, 10:54 PM   #3 (permalink)
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
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someone smart replied:

Quote:
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...
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Old 12-01-2007, 10:55 PM   #4 (permalink)
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
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Also added was this tidbit:

Quote:
All the items MetroMPG listed are correct, but the throttle body is the same as the automatics instead of the base 5spd (couldn't tell by looking). Don't forget the flat black upper bumper cover trim too (instead of the body color).
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Old 06-28-2008, 04:44 AM   #5 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
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
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)

Last edited by Katmandu; 06-28-2008 at 04:57 AM..
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Old 07-10-2008, 09:40 PM   #6 (permalink)
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A former Geo salesman (who today owns a couple first gen Metros) remembers asking a couple of GM engineers about differences. He said the XFi's have lighter weight seats, too.
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Old 07-12-2008, 10:48 PM   #7 (permalink)
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I have read that the xfi cam is 6 degrees advanced.Does anyone know if only the intake lobes are advanced or the whole grind? I can advance the stock cam or get a regrind from Delta in Tacoma Wa. Thanks

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