breaking my turbo virginity
#103
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In my case I think it is 3 injection pulses out of 5. I would try 2 out of 5 next if it was too harsh, but I'm not finding it to be too unsettling on the track.
Your datalogs didn't show any runs up to around 7000 rpm. I'm curious what your duty cycle is at WOT around 7000 rpm.
Your datalogs didn't show any runs up to around 7000 rpm. I'm curious what your duty cycle is at WOT around 7000 rpm.
#104
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In my case I think it is 3 injection pulses out of 5. I would try 2 out of 5 next if it was too harsh, but I'm not finding it to be too unsettling on the track.
Your datalogs didn't show any runs up to around 7000 rpm. I'm curious what your duty cycle is at WOT around 7000 rpm.
Your datalogs didn't show any runs up to around 7000 rpm. I'm curious what your duty cycle is at WOT around 7000 rpm.
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Edit - I forgot to calibrate my IAT sensor... oops
Last edited by rhysmate; 02-23-2013 at 04:04 AM.
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ok, it must be something else somewhere! i calibrated and its reading odd numbers still.. could i really be getting air less that 10 degrees?
heres a log i did on the way home from work. i tried to mix my driving..
another thing i noticed is when i leave off the accelerator the guage goes lean? could that be to do with my target AFR table only going as low as 29 kPa? (when i leave off the MAP says 15 to 16 kPa)
Edit - ill have to upload later this computer is slow
heres a log i did on the way home from work. i tried to mix my driving..
another thing i noticed is when i leave off the accelerator the guage goes lean? could that be to do with my target AFR table only going as low as 29 kPa? (when i leave off the MAP says 15 to 16 kPa)
Edit - ill have to upload later this computer is slow
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You are supposed to go lean when you release the throttle. Mine cuts all of the fuel off when the throttle is released at medium to high RPMs, and factory ECUs do that also. It is called fuel cut on overrun and can be set up in TunerStudio.
Here's mine:
![](https://www.miataturbo.net/attachments/build-threads-57/68509-breaking-my-turbo-virginity-overrun_zpsea0ed2bf.jpg?dateline=1361747444)
It gives you better fuel economy because you don't need to waste fuel when you aren't trying to make horsepower at that point.
Here's mine:
![](https://www.miataturbo.net/attachments/build-threads-57/68509-breaking-my-turbo-virginity-overrun_zpsea0ed2bf.jpg?dateline=1361747444)
It gives you better fuel economy because you don't need to waste fuel when you aren't trying to make horsepower at that point.
#113
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I didn't know you could use the air fuel meter to measure MAT. And I don't think that will work with a turbo anyway because you need to attain a temperature reading from a source after the turbo and after the intercooler. Most people use a GM IAT sensor after the intercooler and somewhere not right behind the radiator. You can drill a hole in the intercooler piping and add it anywhere convenient.
#114
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I see that makes sense! I just didn't like seeing a lean reading.. thanks a lot for all the help so far.. I wouldn't have had the confidence to try this tuning by myself or without some guidance. Its a lot of fun..
I have an IAT sensor that's threaded into the imtercooler piping near the throttle body. .. i wired it following the megasquirt fitting guide which uses the air flow meter connectors. I dont have an air flow ,eter anymore. when I unplug the sensor I get a reading of around 21 degrees, but with the sensor in I get really low and even negative readings? I have a GM sensor from diyautotune and I calibrated it using the resistances that were in the setup manual. And I did it with the car cold
I have an IAT sensor that's threaded into the imtercooler piping near the throttle body. .. i wired it following the megasquirt fitting guide which uses the air flow meter connectors. I dont have an air flow ,eter anymore. when I unplug the sensor I get a reading of around 21 degrees, but with the sensor in I get really low and even negative readings? I have a GM sensor from diyautotune and I calibrated it using the resistances that were in the setup manual. And I did it with the car cold
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Ok, i went and fitted some 295cc injectors and mapped it to 145kpa. then my duty cycle sits at 85%. but my god am i happy.. here's a log. ill be upping boost to 10psi when my 460 cc injectors arrive next week.
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heres my tune file.. the log i did is 3mb and it wont upload. ill get a few snap shots
![](https://www.miataturbo.net/attachments/build-threads-57/68633-breaking-my-turbo-virginity-145kpa5_zps13d5daec.jpg?dateline=1361866812)
![](https://www.miataturbo.net/attachments/build-threads-57/68634-breaking-my-turbo-virginity-145kpa_zpsea5709a6.jpg?dateline=1361866812)
![](https://www.miataturbo.net/attachments/build-threads-57/68635-breaking-my-turbo-virginity-145kpa4_zpsa7d10b41.jpg?dateline=1361866812)
![](https://www.miataturbo.net/attachments/build-threads-57/68636-breaking-my-turbo-virginity-145kpa3_zps7abe3dc7.jpg?dateline=1361866812)
![](https://www.miataturbo.net/attachments/build-threads-57/68637-breaking-my-turbo-virginity-145kpa2_zps56d6aa01.jpg?dateline=1361866812)
this is where i maxed the injectors
![](https://www.miataturbo.net/attachments/build-threads-57/68638-breaking-my-turbo-virginity-983dutycycle_zpsff3e9b7a.jpg?dateline=1361866812)
If you could look at my msq and see what my MAT issue could be that'd be awesome!
![](https://www.miataturbo.net/attachments/build-threads-57/68633-breaking-my-turbo-virginity-145kpa5_zps13d5daec.jpg?dateline=1361866812)
![](https://www.miataturbo.net/attachments/build-threads-57/68634-breaking-my-turbo-virginity-145kpa_zpsea5709a6.jpg?dateline=1361866812)
![](https://www.miataturbo.net/attachments/build-threads-57/68635-breaking-my-turbo-virginity-145kpa4_zpsa7d10b41.jpg?dateline=1361866812)
![](https://www.miataturbo.net/attachments/build-threads-57/68636-breaking-my-turbo-virginity-145kpa3_zps7abe3dc7.jpg?dateline=1361866812)
![](https://www.miataturbo.net/attachments/build-threads-57/68637-breaking-my-turbo-virginity-145kpa2_zps56d6aa01.jpg?dateline=1361866812)
this is where i maxed the injectors
![](https://www.miataturbo.net/attachments/build-threads-57/68638-breaking-my-turbo-virginity-983dutycycle_zpsff3e9b7a.jpg?dateline=1361866812)
If you could look at my msq and see what my MAT issue could be that'd be awesome!
Last edited by rhysmate; 02-26-2013 at 03:20 AM. Reason: Here's the snaps
#118
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I'm trying to determine the incorrect MAT reading problem. I don't know enough to know if any of this is an issue:
<constant digits="1" name="mat0" units="°C">-17.776</constant>
<constant cols="2" digits="1" name="sen_calib_temp" rows="3" units="deg">
0.0 0.0
0.0 0.0
0.0 0.0
</constant>
<constant cols="1" digits="1" name="matCorrTemps" rows="6" units="°C">
4.444
15.554
37.774
54.439
71.104
82.214
</constant>
<constant cols="1" digits="1" name="matTemps" rows="6" units="°C">
71.104
82.214
93.324
104.434
115.544
126.654
</constant>
<constant cols="1" digits="1" name="matCorrDelta" rows="6" units="%">
0.0
0.0
0.0
0.0
0.0
0.0
</constant>
<constant digits="1" name="mat0" units="°C">-17.776</constant>
<constant cols="2" digits="1" name="sen_calib_temp" rows="3" units="deg">
0.0 0.0
0.0 0.0
0.0 0.0
</constant>
<constant cols="1" digits="1" name="matCorrTemps" rows="6" units="°C">
4.444
15.554
37.774
54.439
71.104
82.214
</constant>
<constant cols="1" digits="1" name="matTemps" rows="6" units="°C">
71.104
82.214
93.324
104.434
115.544
126.654
</constant>
<constant cols="1" digits="1" name="matCorrDelta" rows="6" units="%">
0.0
0.0
0.0
0.0
0.0
0.0
</constant>