Doesn't need rehasing, BUT... - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-23-2008, 09:05 PM   #21
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you guys have NO idea how impatient I am about this!! :-) Speak to me!



Does that look better? I want to actually RUN something maybe tonight, depends....
below 2000 rpm, your drivability will suffer. run it all 14-14.6 up to 100 kpa.

and same with 90kpa and greater up to, obviously, where you put safe in-boost AFRs.

And i doubt you want to run leaner than 12:1 anywhere at 15 psi.

Before you burn a new AFR map, please do some reading up on reasonable AFRs. This is getting out of hand.
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Old 07-23-2008, 09:44 PM   #22
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below 2000 rpm, your drivability will suffer. run it all 14-14.6 up to 100 kpa.

and same with 90kpa and greater up to, obviously, where you put safe in-boost AFRs.

And i doubt you want to run leaner than 12:1 anywhere at 15 psi.

Before you burn a new AFR map, please do some reading up on reasonable AFRs. This is getting out of hand.
That's kinda why I'm asking here - I see so many ridiculous numbers everywhere.... People making power I tend to respect tend to be in the low 12 AFR's in boost. I've seen people say you never want to be above 9 or 10. It seems most of the dyno tunes are in the 12.2 range.

the car does idle just dandy at 18 or 19, but I think you're right. Then again, I manually tweaked those cells. :-)


ex:
http://www.russmarshall.com/v/cars/c...geViewsIndex=1
blue and purple lines made the most power

Not arguing, just confused...
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Old 07-23-2008, 11:03 PM   #23
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it's less about absolute power (remember, you run california 91) and more about street reliability and margin of safety. your map was in the 14s at moderately high boost. I'd call that risky for a california gas street car.

have you calibrated your WBO2 lately?
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Old 07-24-2008, 12:02 AM   #24
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Yeah, I have, and you're right, the map was a bit generous. But it's all for naught. Remember how I said my tables were messed up? Well, not everything is messed up, and I have no idea why. Flashes aren't always sticking, MSQ's come up weird. I'm at a total loss, but with an all new computer and untested software and the old reliable stuff gone I don'[t know if it's my soldering or my software.

UHG!
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Old 07-24-2008, 02:39 AM   #25
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People making power I tend to respect tend to be in the low 12 AFR's in boost. I've seen people say you never want to be above 9 or 10. It seems most of the dyno tunes are in the 12.2 range.
Maximum power with gasoline happens at about 12.5:1 AFR. Any richer than that is just safety margin aka charge cooling by the evaporation of excess gasoline. IOW: PCPro.

I've been gradually (very gradually) leaning my table overall in recent weeks. I think I could probably loose another .5 or so across the board and still be in the safe zone, but as Y8s correctly points out, I'm ultimately willing to sacrifice a few ft/lbs for a margin of safety. It'll be interesting to see what happens in a couple of weeks when my car gets it first tankful of NC 93 octane.


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everything is messed up, and I have no idea why. Flashes aren't always sticking, MSQ's come up weird. I'm at a total loss, but with an all new computer and untested software and the old reliable stuff gone I don'[t know if it's my soldering or my software.
Sucks that you couldn't make it up tonight. Chris & I explored some really interesting beers, including one Russian Imperial that, despite being 10% ABV and quite strong, had just a touch of creamy sweetness about it- it was rather pleasant.
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Old 07-24-2008, 10:52 AM   #26
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thread jack: joe, i tried some allagash dubbel the other day. very tasty, very belgique.

also there's this one rogue hop beer (I think) that's $39.99 for a 12oz. what's up with that?
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Old 07-24-2008, 02:10 PM   #27
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Maximum power with gasoline happens at about 12.5:1 AFR. Any richer than that is just safety margin aka charge cooling by the evaporation of excess gasoline. IOW: PCPro.

I've been gradually (very gradually) leaning my table overall in recent weeks. I think I could probably loose another .5 or so across the board and still be in the safe zone, but as Y8s correctly points out, I'm ultimately willing to sacrifice a few ft/lbs for a margin of safety. It'll be interesting to see what happens in a couple of weeks when my car gets it first tankful of NC 93 octane.
Some time ago, I leaned out the top end, richened up the bottom, and (how many times can the car get unimaginably better? Does it get worse inbetween these? each time it gets better it seems it can get no better) got so much faster! I was shocked. So keeping the top end reasonably lean is a Good Thing. Seems like 12.0 is as low as you really want to go?

Quote:
Sucks that you couldn't make it up tonight. Chris & I explored some really interesting beers, including one Russian Imperial that, despite being 10% ABV and quite strong, had just a touch of creamy sweetness about it- it was rather pleasant.
Damnit, I know. Turned out good - and a friend's (Leo) MS up and died on him as well. His I just turned on, everything looked great, put it back on the car and called it good (tweaking accel enrich so it wasn't a wash coming out).

My own box... I dunno, I could flash it, but it seemed any msq I wrote to it would start to upload, then somehow it would corrupt where it stores the information about reading system voltage. Then it would refuse to write the rest of the pages since the voltage was too low. Very odd. Different combinations of old MSQ's and MT 2.25 p1/2/3 and s19's left me really confused.

I took the MS out, resoldered all the pins on the CPU socket, reseated the chip.. I'm not sure what CAUSED the errors and corrupted so much stuff that had worked reliably before... But it seems to be good again as long as I don't load an MSQ from the last month or two.

So it's all up and working. The car seems to be fine, except for a small part right at 4200 rpm, where the table is pretty flat and I don't see why, but it's bucky and bouncy. It certainly takes more throttle to get down the road, but I imagine it is saving gas, and the throttle response is good. It still seems to be the transition into high RPM at low load that is a bit odd.

And, as an aside, I figured out my idle is doing something weird. My "integrating, decaying derivative" is decaying WAY too slow.. :-P
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