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Old 11-28-2007, 02:47 PM   #11 (permalink)
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OK, smartypants... if a cam swap can improve efficiency, why don't all Metros have this kind of cam?

Because the cam profile is not good for top end performance. Lowers the redline (valves are more prone to floating than with the stock cam).

Remember the XFi also has a taller than regular final drive, so its cam profile goes better with that.

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Old 11-28-2007, 02:49 PM   #12 (permalink)
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Cam update (originally written March 14/07)

Have I mentioned yet how much I like what this has done to the character of the engine? I really like it. It's so much more suited to my driving style.

I would recommend this mod to any Metro owner, particularly in combination with the longer legs. If I had the chance to buy an XFi over a regular Metro, I'd do it just for the difference in the way (I imagine) it drives.

I'm starting to realize I'd probably also really like driving a manual shift diesel for the same reasons - low end torque, short shifting, quiet, laid back, un-fussy.
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Old 11-28-2007, 02:49 PM   #13 (permalink)
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

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Winter beater Metro - '00 Chevrolet Metro
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For anyone following this thread, I've updated MetroMPG.com with a post summarizing the issues, installation, and (predominantly subjective) results of installing the cam in my car. Most of what you've read here is included, with some new bits added:

International heart transplant: the Blackfly gets an XFi cam - MetroMPG.com
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Old 01-22-2008, 10:42 AM   #14 (permalink)
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For those wanting another Metro owner's perspective on the cam swap, Frederick has a thread about his car: Another Metro to get taller final drive & XFi cam
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Old 01-22-2008, 11:20 AM   #15 (permalink)
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Pretty cool thread you resurrected here! I never realized swapping a cam could resulting in any significant improvements.
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Old 07-03-2008, 03:20 PM   #16 (permalink)
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Question

What is the Lift/Duration (@.050" - Not Advertised #) for the XFi Camshaft ?
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Old 07-03-2008, 03:50 PM   #17 (permalink)
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I have been driving Espresso for a few months.
It has the XFi cam and a taller gear, actually TALLER than a regular XFi. I got it from a 4 cyl, SOHC.

When asked by members of The Order Of Canada yesterday which car did I prefer: Vanilla Latte with a stock turbo swap or Espresso Nero. I could not lie, even though my lips were stained cherry red:
The XfI cammed one. Sirs.

Yes, Espresso Nero, is a joy to ride. Particularly when passing.................... gas stations.
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Old 10-25-2008, 03:34 PM   #18 (permalink)
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I just installed the XFI regrind in my latest 92 Metro convertible. Stock gear ratio, 13" tires at 32psi, 8 degree cam advance, Mobile 1 synthetic ATF in my transaxle, seat of the pants ignition advance. With the top up and windows closed I used .78 gallons of fuel in 41.6 miles for 53.3 miles per gallon. I filled the gas right to the filler neck 1/2 inch above the flapper and shook the car to get any air out and repeated the procedure at the end of the trip. Top speed was 65mph for short periods and there were a few traffic lights before getting on the highways. Average speed was 60.

My previous best on the same trip was 44mpg stock with 90w gear oil in the trans. Only a long term average will show accurate results. But I am certain that I am using far less throttle opening and it has more torque at lower rpm. I will be trying Singh grooves in the head as soon as my gaskets and head bolts arrive. I like the feel of the XFI cam and really appreciate the fuel economy boost while I keep my same driving habits.
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Old 06-04-2011, 06:45 PM   #19 (permalink)
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I'm curious if all xfi cams are the same? What should I look for to replace my 1997 metro?
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Old 06-04-2011, 07:16 PM   #20 (permalink)
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Its 2-1/2 years later and my daily driver still runs well with the XFI cam. Around town with no unusual driving techniques it gets a solid 44mpg. On a recent trip of 400 miles each way it averaged 54mpg just by holding the posted speed limits. On the same repeat trip 2 weeks later but in a hurry to get home it averaged 49.5 mpg with speeds exceeding 75mph at times.

XFI cams should be all the same specs. I put syntheyic ATF in the trans and keep the tires around 35psi. Woops, no Singh grooves in the head yet. I will have .040 removed from the head when I do this but the car is so reliable as a daily driver that I don't mess with it. I love what this cam did for my car.

For those of you who remember, the 70mpg diesel Metro sits in storage, unable to be registered in the Republik of Kalifornia. It may get a mid engine 3.8 supercharged Olds V-6 sitting on my engine stand if I feel cheeky enough.....but the 6.5 turbo diesel going in my boat has my full attention right now. Click here if you want to see it...

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