18 mpg - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-04-2010, 06:06 PM   #21
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That's the worst afr targets I've seen....Your AFT + Narrow band = Fail at life
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Old 03-04-2010, 07:08 PM   #22
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I'm getting around 19mpg too. I just haven't leaned it out yet since I'm not confident about the base timing map.
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Old 03-04-2010, 08:10 PM   #23
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HOLY **** those afr targets are fucked up
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Old 03-04-2010, 08:46 PM   #24
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The target table behaves completely different when used with a narrowband sensor. I've got mine to go to open loop above 85 kPa, and anything that isn't set to a target of 14.7 is ignored by the Adaptronic.

I've already had all the cells tuned on a stead state dyno so I think having a wideband O2 sensor is bordering on useless now, unless I want to target a 15:1 cruise or something.

If I was plugging in an wideband O2 sensor into the Adaptronic then yes it would be fail city.

This is what I came up with on my old car (LC-1 equipped) which gave good economy:



It's not really relevant for this setup, as discussed above re narrowband sensor.

Last edited by timk; 03-04-2010 at 08:57 PM.
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Old 03-04-2010, 09:13 PM   #25
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What are your startup enrichments? My mpg went up as I've adjusted mine.

I still only get ~20mpg unless I baby it, but I'm almost always in boost at ~75+ mph with lots of hills.
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Old 03-04-2010, 09:14 PM   #26
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I know - get rid of that POS and get another SE!
Plenty for sale atm.

Stu
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Old 03-05-2010, 08:23 AM   #27
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Here's a link to a datalog from tonight:
http://sites.google.com/site/timkent/5-03-2010_2104.csv

It appears that the narrowband O2 is hovering around stoich at cruise like it should.
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Old 03-05-2010, 09:53 AM   #28
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That sexy thing gets me about 27mpg.
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Old 03-05-2010, 10:14 AM   #29
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Damn, that's a lot of AFR target points, nice.
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Old 03-05-2010, 01:07 PM   #30
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I know I'm jealous.
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Old 03-05-2010, 02:35 PM   #31
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You guys are silly with your low resolution maps

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Old 03-05-2010, 03:18 PM   #32
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Quote:
Originally Posted by Full_Tilt_Boogie View Post
You guys are silly with your low resolution maps

yes your map is very high resolution. what the **** is a millbar and does thsi "hondata" make miata stuff? :P
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Old 03-05-2010, 03:23 PM   #33
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hehe

Thats actually Crome, which is FREE!
You can re-chip the factory ECU, burn a Crome tune onto the chip, and you have the resolution of a standalone AEM and it only cost you 30 bucks.

Now why couldnt mazda have made their ECUs so capable?
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Old 03-05-2010, 03:43 PM   #34
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Quote:
Originally Posted by y8s View Post
yes your map is very high resolution. what the **** is a millbar and does thsi "hondata" make miata stuff? :P
It has inches/psi of vac/boost on the row below millibar

We wire up after market ecu's, why couldn't we use a honda ecu? They can be reprogrammed so it shouldn't matter as long as the cylinder count is the same. Or does honda use some wierd cam/crank signal? Then we could have powered by honda stickers too!
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Old 03-05-2010, 03:58 PM   #35
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Quote:
Originally Posted by TurboRoach View Post
It has inches/psi of vac/boost on the row below millibar

We wire up after market ecu's, why couldn't we use a honda ecu? They can be reprogrammed so it shouldn't matter as long as the cylinder count is the same. Or does honda use some wierd cam/crank signal? Then we could have powered by honda stickers too!
I've thought long and hard about using a 1g EPROM ecu from a DSM. I know it is possible because 1.People have run sr20's on them before. and 2. From an electronics standpoint, our cars are basically 99% identical to a 1g dsm. The ignitors, the coilpacks, the cas, everything. They are infinitely adjustable, have built in knock detection(probably worthess for us due to bore size) And can run in speed density mode with a simple flash. Plus the stock ECU ROM only takes up 1/2 the space on the chip, so there is plenty of room to write custom code (to double the available resolution for example, I've done it, works well) Add an ostrich into the mix and you have a very slick tuning solution. I think it would be super easy to get it drivable too because once you change the main VE maps, everything (startup and AE included) are modified by changing a the injector size globally (you can edit deadtime too ).


Quote:
Now why couldnt mazda have made their ECUs so capable?
Actually in Japan, they did. Japanese miatas used an ecu that had a separate ROM chip on it. You could change the fuel/timing curves, injector size, etc. For whatever reason, when they brought these cars to America, they integrated the ROM into the CPU and noone to my knowledge has come up with a way to break it out into something flashable.
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Old 03-05-2010, 04:05 PM   #36
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You could make a honda ECU wok on a miata, but you would have to mount the honda distributor on the front of a cam gear.
It has to go on the front of the cam because honda engines spin backwards, and they have the distributor on the back of the cam.

I actually thought about doing, but it would probably prove to be pretty difficult.
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Old 03-05-2010, 04:08 PM   #37
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Quote:
Originally Posted by Jeff_Ciesielski View Post
Actually in Japan, they did. Japanese miatas used an ecu that had a separate ROM chip on it. You could change the fuel/timing curves, injector size, etc. For whatever reason, when they brought these cars to America, they integrated the ROM into the CPU and noone to my knowledge has come up with a way to break it out into something flashable.
Why cant we get these ECUs? and do you know if there is already software developed to write a tune to them?
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Old 03-05-2010, 04:09 PM   #38
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Quote:
Originally Posted by Full_Tilt_Boogie View Post
You could make a honda ECU wok on a miata, but you would have to mount the honda distributor on the front of a cam gear.
It has to go on the front of the cam because honda engines spin backwards, and they have the distributor on the back of the cam.

I actually thought about doing, but it would probably prove to be pretty difficult.
I wonder how hard this would be to fake with the CAS or a trigger wheel...
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Old 03-05-2010, 04:15 PM   #39
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Quote:
Originally Posted by Full_Tilt_Boogie View Post
Why cant we get these ECUs? and do you know if there is already software developed to write a tune to them?
We can, and there is. Let me try to find the link, I haven't seen it for a long time. I'm pretty sure I got it deep from within the bowels of M.Net.
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Old 03-05-2010, 04:23 PM   #40
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Quote:
Originally Posted by Full_Tilt_Boogie View Post
Why cant we get these ECUs? and do you know if there is already software developed to write a tune to them?
Bingo.

The company is called GRID Japan.

Some info:
ROMチューニング用追加基板の取付
ROM????

(all in japanese )

And the jackpot:
Japanese Performance Parts and ROM Tuning GRID


Not even sure if they still make the miata version.
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