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Old 06-18-2008, 01:52 PM   #21
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Quote:
Originally Posted by Mach929 View Post
i'm using rx7 550cc pnp inejectors that flowed out at 620cc
No ****! Well done!

Mine are also 550cc. I guess I have a lot of work ahead of me!
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Old 06-18-2008, 01:52 PM   #22
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This reminds me that I've got to do some "cruise" tuning. I think I'm sitting pretty rich at around 15:1 in cruise most of the time. That being said, I just filled up last night and got 26mpg... including A LOT OF TIME WITH THE EBC ON! I think I can manage a few more mpg's with some laptop time. There's definitely 30+mpg in it somewhere. If I could keep my finger off the EBC switch, I'm sure 28mpg would be the norm.
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Old 06-18-2008, 01:54 PM   #23
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Quote:
Originally Posted by Mach929 View Post
i'm using rx7 550cc pnp inejectors that flowed out at 620cc
You'd probably be better off with smaller injectors. But what's done is done. Tune it leaner.

I still don't understand why you guys like to cruise around at stoich? Lean that bitch up. Just leave it fat for when you stand on the loud pedal. I get fantastic economy, and very few of you ******* make more power than me*

*built motors need not apply
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Old 06-18-2008, 03:13 PM   #24
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I've leaned out my AFM out to 15.1 idle and cruise. Normal mixed driving (highway/surface/sprited) I get a tad over 24 mpg. I've never driven an entire tank on surface streets and I don't plan on doing that. On the highway, I've gotten as high as 32 mpg driving conservatively.

Currently, I'm driving extremely conservatively to see just how high my mpg can go with mixed driving.
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Old 06-18-2008, 03:27 PM   #25
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Anyone monitoring their egt while leaning their cruise?
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Old 06-18-2008, 03:45 PM   #26
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Yes I have a pyrometer on my a pillar
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Old 06-18-2008, 03:58 PM   #27
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Yes, temp is up slightly.
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Old 06-18-2008, 04:11 PM   #28
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Quote:
Originally Posted by FHS View Post
Yes, temp is up slightly.
add a little bit of timing
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Old 06-18-2008, 04:50 PM   #29
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I've been getting 17 for as long as I can remember. I thought it was cold start settings since most of my driving is 7 miles to work on back roads, and 7 back. With the miata club, I get 30-32.

I used to cruise very lean, but it didn't really help, richening it up got me better response, so I try to stay in the 15-15.5 range. I keep wanting to tune it for economy, but haven't yet. I need to have something that spits out fuel usage per revolution as a loggable variable into the MS code, then I could get economy out of it pretty easy.
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Old 06-18-2008, 06:34 PM   #30
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Quote:
Originally Posted by Ben View Post
19.2:1 FTMFW
are you being serious with 19.2:1?

also you guys getting really good mileage show me your afr target tables and spark tables please
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Old 06-18-2008, 06:39 PM   #31
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Yeah - I was running 18-20 AFR's for a while. But you're less effecient since you need more throttle to get the same power. Or, you can be. Lean burn is fine, but overdo it and you should hurt your mileage. Also, spending at least 5 minutes a day out of boost helps. So I hear, I wouldn't be knowing.
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Old 06-19-2008, 03:30 AM   #32
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on ms i run bout 16-1 and have a decently agrressive overrun in cruise that puts me to 20-1 or so.
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Old 06-19-2008, 09:10 AM   #33
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Quote:
Originally Posted by Mach929 View Post
are you being serious with 19.2:1?
Yeah

Abe--it's more complicated than that. Wider throttle angles mean lower pumping losses. And remember it doesn't take much power to maintain cruise. So super lean cruise is great as long as you have your accel enrich set to keep you fat when you accelerate.

Proof is in the pudding. My car is fast, responsive, and gets wonderful economy.
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Old 06-19-2008, 01:56 PM   #34
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Ok, I will give you that. I messed with lean cruise before I got even close on my accel enrich settings. I will revisit this.

Got a good source for EGT probes? I got one I thought would be good, it lasted like 3 months.
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Old 06-20-2008, 03:41 PM   #35
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Quote:
Originally Posted by J.T. View Post
I wonder...Did the Miata have a CA and a US version? I know a lot of newer cars have slightly different parts(mostly smog related) depending on whether or not htey were desined to be CA cars which might explain some slight MPG differences
Look it up, the CA version has completely different exhaust system so they can be overly cautious with their emissions.
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Old 06-20-2008, 05:30 PM   #36
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The cali versions are only different in a few years. And it's not just cali. NY also gets the same cars, and I think one maybe two other states. DEfinately in 99-00. I think in '01 everyone gets the same again.

My car is from TX. Still smells of queer.

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Old 06-20-2008, 05:47 PM   #37
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-wrong forum-
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Old 06-20-2008, 05:58 PM   #38
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Originally Posted by Jesse H View Post
-wrong forum-
I could argue against that considering that they're discussing how to tune cruise for best effenciency.
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Old 06-20-2008, 06:03 PM   #39
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Quote:
Originally Posted by Jesse H View Post
-wrong forum-
WTF are you?

<--- Yeah that's right SUPER mod bitch

I say let them play through
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Old 06-21-2008, 10:17 PM   #40
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Ben, so how much timing are you running in your cruise map (3k-4kish and 20-60kpa) Ive got mine tuned to 16:1 and roughly 35 - 40* of timing there, still not getting fantastic economy though ... last fillup was 18mpg but with 3.9 gears and unknown speed sensor since the tranny was replaced with a 97 trannie at some point so 5 or 10% more depending on that, and i hardly even boost nowadays because premium is $4.78 here :( **** that.
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