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Author Topic: Convince me to go 4cyl  (Read 18836 times)

jpod999

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Convince me to go 4cyl
« Reply #60 on: October 20, 2007, 11:00:37 AM »
I don't know how you guys are getting such good gas mileage...I just filled up yesterday, 23mpg.  And I don't leave it at 5,000 RPM all the time.
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christophbmw

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« Reply #61 on: October 20, 2007, 12:49:13 PM »
Quote from: jpod999;36155
I don't know how you guys are getting such good gas mileage...I just filled up yesterday, 23mpg.  And I don't leave it at 5,000 RPM all the time.

agreed, around town i only get 23ish, on the freeway i can get close to 28 one time i got 29.2, i was stoked i was doing 85mph (on the way to bimmerfest).
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eric ^__^

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Convince me to go 4cyl
« Reply #62 on: October 20, 2007, 01:55:55 PM »
so the mpg gauge doesn't actually work?
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christophbmw

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« Reply #63 on: October 20, 2007, 02:21:11 PM »
Quote from: eric ^__^;36172
so the mpg gauge doesn't actually work?


it does but its not accurate, full throttle shows 3-5mpg while accelerating, neutral shows 60+ mpg while coasting on the freeway and driving 70mph in 5th shows about 26.......if you can calculate all those difference in your head while driving; then ya it works. its more of a sophisticated vacuum gauge if you ask me :rolleyes:.
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sheepdog

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« Reply #64 on: October 20, 2007, 06:51:26 PM »
It works decent if everything is in perfect working order.
When was the last time your fuel filter was changed, oil, plugs, O2 sensor, etc...

Still I find mine to not be bad. As has been said, you have to average it out.

And yes it is pretty much a vacuum gauge with some tweaks to it as far as I can tell.
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ducatipaso

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« Reply #65 on: October 21, 2007, 10:16:55 PM »
my car only has 135k on if... that might be helping ;)
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EN318isPDX

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Convince me to go 4cyl
« Reply #66 on: October 22, 2007, 01:03:38 AM »
Quote from: ducatipaso;36253
my car only has 135k on if... that might be helping ;)


not bad. have you ever replaced your O2? thats one of my top tune up pieces to come
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gearheadE30

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« Reply #67 on: October 22, 2007, 09:31:54 AM »
I dunno, I'm getting 27 with almost no highway driving. 201k miles, magnaflow exhaust, mark d chip, basic stuff like that, so I doubt that's why. This is calculated with the trip odometer, and I don't know how accurate that is. My overall tire sive is very close to that of stock tires.
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ducatipaso

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« Reply #68 on: October 22, 2007, 10:59:37 AM »
Quote from: EN318isPDX;36257
not bad. have you ever replaced your O2? thats one of my top tune up pieces to come


No, I have not. The car had 105K on it when we bought it 10 years ago (from a dealer) so I'm sure it had it done as they did a L2 inspection on it before we purchased it.

It does surge quite a bit at idle [esp when cold] so I'm sure a tuneup is in order. I'm thinking I might replace the AFM, plugs, wires and O2 sensor this spring.
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gearheadE30

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« Reply #69 on: October 22, 2007, 03:58:26 PM »
Idle is probably the idle control valve. It is a cylinder behind the upper intake manifold and is partially hidden by the cowl. This is half the cost of a new AFM and is probably more effective. My AFM is original at 200k and has no problems, but the ICV has been replaced.
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EN318isPDX

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« Reply #70 on: October 22, 2007, 04:11:12 PM »
Quote from: ducatipaso;36287
No, I have not. The car had 105K on it when we bought it 10 years ago (from a dealer) so I'm sure it had it done as they did a L2 inspection on it before we purchased it.

It does surge quite a bit at idle [esp when cold] so I'm sure a tuneup is in order. I'm thinking I might replace the AFM, plugs, wires and O2 sensor this spring.


Nice, my car was bought used and it was "inspected" during this inspection they must have removed my oil sump pickup haha
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ducatipaso

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« Reply #71 on: October 23, 2007, 08:06:12 PM »
Quote from: gearheadE30;36314
Idle is probably the idle control valve. It is a cylinder behind the upper intake manifold and is partially hidden by the cowl. This is half the cost of a new AFM and is probably more effective. My AFM is original at 200k and has no problems, but the ICV has been replaced.


cool I'll check into that. it goes rrrrrRRRRRRrrrrrRRRRRRRrrrrrr when it's cold.
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jpod999

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« Reply #72 on: October 23, 2007, 08:43:09 PM »
Quote from: ducatipaso;36428
cool I'll check into that. it goes rrrrrRRRRRRrrrrrRRRRRRRrrrrrr when it's cold.


Very technical.  ;)
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ducatipaso

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« Reply #73 on: October 24, 2007, 11:06:19 AM »
Quote from: jpod999;36432
Very technical.  ;)


sometimes, a sound is worth a thousand written words :D

the amplitude of the idle hunting is from about 650-1100RPM
the frequency is about 1Hz

better?
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