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PostPosted: Tue Oct 21, 2008 2:07 pm 
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Joined: Thu Jul 03, 2008 7:10 am
Posts: 48
Location: united states
guys i have a 1998 metro ,it has usually mods,remove bridge in airfilter,k@nairfilter,removed all hoses in well for airfilter,no spare back seat,tires at 44psi both rear mirror deletes car runs good no check engine lites etc.Before i installed the xfi cam from 3tech and the =10 gear i was getting 48 miles a gallon with some pulse and glide.i installed the cam and +10 got the timing around 8 degress with no ping i went to 10 and it was pinging.the car sounds good etc.but i have averaged my last 5 tanks and i am getting alittle over 43 now!!i am contemplating putting the old cam and gear back in.what do you guys think?i have the basic same route ,i actually went a couple hundred miles on my last tankfull and thought the extra highway mileage would boost it but got the same mpg.i drive 55 and dont gas it etc.i am just surprised as i thought the xfi cam and gear would get me some mpg improvement but not on my metro.like i said the car ran great before and after just not getting the mileage i got with the old cam and gear.what are your thoughts


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PostPosted: Tue Oct 21, 2008 11:32 pm 
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Joined: Fri Jul 27, 2007 8:20 pm
Posts: 2973
Location: Saskatchewan
youre doing it wrong.


drive it better

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1991 Swift GT Build G10 +25 psi + other goodies
1996 Metro Build QR25de swap, still undecided where to take it
the lolcar family


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PostPosted: Wed Oct 22, 2008 5:37 am 
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Location: Ashtabula, Ohio
Is the weather colder where you are? Colder temps make a huge difference in fuel economy.

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PostPosted: Wed Oct 22, 2008 8:25 am 
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Joined: Fri May 06, 2005 11:42 am
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Location: Kentucky
I have had the 3Tech econo cam and 8 degree installed in my car for several years. When I installed it it didn't make a measureable difference in mileage one way or the other. I agree with mullet its likely the cooler temps or gas formulation change so I'd stick with it till at least next spring.

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PostPosted: Wed Oct 22, 2008 8:42 am 
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Location: Fort Atkinson WI
Timing off? I dunno Mullet gets good mileage without the cam or sprocket upgrades. Maybe good was good enough?

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PostPosted: Wed Oct 22, 2008 3:06 pm 
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Joined: Thu Jul 03, 2008 7:10 am
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Location: united states
it has gotten cooler here,does it vary 5mpg when it gets cooler?sounds like that could definitely be making an impact them


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PostPosted: Fri Oct 24, 2008 4:41 pm 
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Location: Minnesota
The 10 degree sprocket is for the stock 1998 cam. Assuming you are running the 1.0L engine.

The XFI cam and most likely the 3tech economy cam have 4-6 deg advance ground in to the cam over stock.
I would recommend you switch to 4 deg advance cam sprocket. Back off the ignition timimg to about 6 deg.
and drive faster.

Your aerodynamic mods are more effective at highway speeds. Allowing you to
travel faster at 65-70 mph using the same fuel you would normally use at 60 mph = 49mpg.

The way your cam timing is set up now your power band is at about 45 mph.

The KN filter is not helping you if you comprimized your warm air intake you get better mileage using warm air.

Good luck in your endeavors.

For right now I would just set the timing for 4 deg and you will see what I mean.


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PostPosted: Fri Oct 24, 2008 7:28 pm 
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Location: Saskatchewan
what? pull timing BACK to get more fuel economy?? blasphemy

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1991 Swift GT Build G10 +25 psi + other goodies
1996 Metro Build QR25de swap, still undecided where to take it
the lolcar family


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PostPosted: Fri Oct 24, 2008 7:46 pm 
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Joined: Thu Jul 03, 2008 7:10 am
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Location: united states
i wonder what superflys opinion would be?would a xfi transmission help the way i am setup now?


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PostPosted: Sun Oct 26, 2008 12:35 am 
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Location: Saskatchewan
keep your foot out of it, its slower to get the fuel economy, you cant mash the throttle down more to compensate.

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1991 Swift GT Build G10 +25 psi + other goodies
1996 Metro Build QR25de swap, still undecided where to take it
the lolcar family


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PostPosted: Sun Oct 26, 2008 10:36 am 
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Location: Ontario, Canada
jbelgarde wrote:
i wonder what superflys opinion would be?would a xfi transmission help the way i am setup now?


IMO, no.
If you think you need to do something, I would recomend a standard 4.10 trans.
I'm really surprised that you are seeing these results. If you have the time, I would suggest you try a few things.
Since its easy, move that sprocket back to stock, and run a few tankfulls through it, and see what you get.
If you have the interest, swap out the cam, put the stock one back in, and run it with the +10.
Cover all the bases, and see what results you get. In all cases, run as much timing advance as possible.

Like I said. I'm a little surprised. The cam, and sprocket are known quantities, have been tested, and gave positive results in all cases.
There is really no black magic, and very litle room for error. The results I would expect you to see won't be huge, but you should see both a small increase in MPG, and drivability.

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PostPosted: Sun Oct 26, 2008 10:49 am 
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Joined: Thu Jul 03, 2008 7:10 am
Posts: 48
Location: united states
thanks superfly ,it has gotten colder here in newengland so i am wondering if that is the cause,what kind of impact would the xfi transmission have with the 13 inch wheels and tires
jb


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