Originally Posted by Mach929
(Post 272979)
i'm using rx7 550cc pnp inejectors that flowed out at 620cc
Mine are also 550cc. I guess I have a lot of work ahead of me! ;) |
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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Originally Posted by Mach929
(Post 272979)
i'm using rx7 550cc pnp inejectors that flowed out at 620cc
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 fuckers make more power than me* *built motors need not apply |
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. |
Anyone monitoring their egt while leaning their cruise?
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Yes I have a pyrometer on my a pillar
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Yes, temp is up slightly.
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Originally Posted by FHS
(Post 273050)
Yes, temp is up slightly.
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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. |
Originally Posted by Ben
(Post 272951)
19.2:1 FTMFW
also you guys getting really good mileage show me your afr target tables and spark tables please:) |
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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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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Originally Posted by Mach929
(Post 273130)
are you being serious with 19.2:1?
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. |
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. |
Originally Posted by J.T.
(Post 272553)
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
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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. :giggle: |
-wrong forum-
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Originally Posted by Jesse H
(Post 274083)
-wrong forum-
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Originally Posted by Jesse H
(Post 274083)
-wrong forum-
<--- Yeah that's right SUPER mod bitch I say let them play through |
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 :( fuck that.
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