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Old 10-10-2012, 08:56 AM   #101
Cobb Tuning
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Tell us more about the Firmware Update -4707!

-Addition of 2.0L Speed Density Support

:-)
We are close to releasing SD 2.0L support, so keep an eye out for the announcement this week (there will be one in this forum and others as well as our blog).

Bill
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Old 10-10-2012, 10:58 AM   #102
shooting
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F yeah bill cannot wait to test it! hope me riding you every month to keep at it didnt bother you too much. LOTS of kids will be thanking you very soon.
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Old 10-10-2012, 01:24 PM   #103
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F yeah bill cannot wait to test it! hope me riding you every month to keep at it didnt bother you too much. LOTS of kids will be thanking you very soon.
No worries. I can understand how hard it is to wait for a new feature that you want.

Bill
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Old 10-17-2012, 12:48 AM   #104
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Bill, how is SD affected by hot/cold weather changes and elevation; say a change for 6000 feet to 1000 feet. I worry that a straight SD tune would make the cars tune unsafe on a road trip.
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Old 10-17-2012, 09:23 AM   #105
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Bill, how is SD affected by hot/cold weather changes and elevation; say a change for 6000 feet to 1000 feet. I worry that a straight SD tune would make the cars tune unsafe on a road trip.
Changes in altitude can impact exhaust backpressure which can also impact VE. This is why we've included a SD baro comp table which can be tweaked to mitigate this effect.

Hot/cold weather is not a concern in general because the estimation of cylinder charge temp is being made by the IAT sensor with our SD, so the air density can be approximated with temperature changes. Where that would be an issue is on a system that uses no cylinder charge temp calculation. However, heat soak of the IAT sensor can be problem as you would then have a temp that was higher than actual, causing the SD airflow calculation to be less than actual (causing you to go lean with more ignition adv). Post-IC IAT placement is your best bet to minimize heat soak issues. You can also tweak the SD IAT comp table to mitigate this issue somewhat. Check out our SD tuning guide for more details.

Bill
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Old 01-14-2013, 04:47 PM   #106
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With SD would there be any problem changing how my intercooler piping is as long as I keep my IAT on the cold side of the FMIC.
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Old 01-15-2013, 08:41 AM   #107
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With SD would there be any problem changing how my intercooler piping is as long as I keep my IAT on the cold side of the FMIC.
Not a problem unless you already have an SD tune. Anything that could potentially change VE (after your SD tune) should be verified after the change (via wideband o2). Maybe in this case, the change in VE will be negligible (depending on what you are doing). Also, if you are changing the position of the IAT sensor, that could theoretically impact its reading. Again, may be negligible, depending on what you are doing.

Bill
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Old 01-15-2013, 02:09 PM   #108
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I have a SD tune righ now and I was planning on reversing the piping so the cold side isn't over the turbo. The IAT is right after the intercooler so I would just put it on the other side. Thanks for your help
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Old 01-16-2013, 10:34 AM   #109
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I have a SD tune righ now and I was planning on reversing the piping so the cold side isn't over the turbo. The IAT is right after the intercooler so I would just put it on the other side. Thanks for your help
Probably won't make a difference, but with SD, you want to verify fueling (especially at high load) any time you make any hardware change that can maybe impact airflow or the IAT accuracy. Probably not an issue here, but good practice to verify anyway. You definitely want to be running a wideband o2 with in-car gauge with your SD tune anyway.

Bill
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Old 01-16-2013, 11:52 AM   #110
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I got my access port im at stage 2 im about to get my center gauges put in...i know there is endless things to do...i dont know what else to do?
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Old 01-16-2013, 12:02 PM   #111
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I got my access port im at stage 2 im about to get my center gauges put in...i know there is endless things to do...i dont know what else to do?
What do you mean by "to do"? Additional mods? What are all the mods you have right now?

Bill
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Old 01-18-2013, 09:14 PM   #112
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If you want additional mods, read this:

http://forums.nasioc.com/forums/show....php?t=2296145
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Old 07-08-2013, 11:16 PM   #113
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Hate to bump such a old thread but is the wiring essentially the same for hybrid vs full sd? Meaning you have an aem iat sensor to replace the temp sensor in the maf but you use the maf for everything else or is there a way you have to wire it which will allow the maf temp sensor to work as well as the aftermarket sensor?

I imagine that you would need to have both the maf iat and an aem iat to adjust for low speed and heat soaked iat but I can't seem to find any info
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Old 07-08-2013, 11:35 PM   #114
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Hate to bump such a old thread but is the wiring essentially the same for hybrid vs full sd? Meaning you have an aem iat sensor to replace the temp sensor in the maf but you use the maf for everything else or is there a way you have to wire it which will allow the maf temp sensor to work as well as the aftermarket sensor?

I imagine that you would need to have both the maf iat and an aem iat to adjust for low speed and heat soaked iat but I can't seem to find any info
I'm kinda wondering the same thing for a hybrid sd tune. Everything I've read says that moving the IAT sensor to the cold side of the intercooler is advisable when running a full SD tune (basically doing away with the maf sensor altogether). Since I'm leaning towards running SD during boost, the maf sensor still has to function. I don't know how the maf sensor is wired, but if the IAT sensor and the air meter are independent of each other, will disconnecting the stock IAT and installing an aftermarket iat sensor on the cold side of the intercooler have negative effects during maf controlled driving or is it something that just needs to be tuned for?

Also, if running a hybrid SD tune, is the potential for lean conditions still there if running a VTA bov?
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Old 07-09-2013, 08:37 AM   #115
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You can only have one IAT sensor wired in at a time so an aftermarket sensor would replace the IAT sensor in the MAF assembly (check out the appendix in our Speed Density tuning guide via help menu for details on how to wire it up).

IAT sensor post-intercooler is not a huge deal for the MAF side of a hybrid tune or full MAF tune. Make sure you use the correct IAT sensor calibration for an aftermarket sensor. You may have to tweak the ign. timing IAT compensation table depending on how it is set up in your tune and what works best.

Bill
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Old 07-10-2013, 11:21 PM   #116
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You can only have one IAT sensor wired in at a time so an aftermarket sensor would replace the IAT sensor in the MAF assembly (check out the appendix in our Speed Density tuning guide via help menu for details on how to wire it up).

IAT sensor post-intercooler is not a huge deal for the MAF side of a hybrid tune or full MAF tune. Make sure you use the correct IAT sensor calibration for an aftermarket sensor. You may have to tweak the ign. timing IAT compensation table depending on how it is set up in your tune and what works best.

Bill
Thanks Bill. Any word on lean conditions when using a VTA bov with a hybrid SD tune?
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Old 07-11-2013, 08:46 AM   #117
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Thanks Bill. Any word on lean conditions when using a VTA bov with a hybrid SD tune?
If you are running MAF on the low end (SD on high end) with your hybrid tune (and not vice versa), this will not eliminate the rich condition from VTA BOV. You would need to go to full time SD to fully mitigate it.

Bill
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Old 07-11-2013, 11:17 PM   #118
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If you are running MAF on the low end (SD on high end) with your hybrid tune (and not vice versa), this will not eliminate the rich condition from VTA BOV. You would need to go to full time SD to fully mitigate it.

Bill
Ok that's what I figured. Thanks Bill.
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Old 07-17-2013, 01:13 PM   #119
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I have a 09 STI. Which two wires from the MAF need to be cut and spliced into my IAT?
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Old 07-17-2013, 06:22 PM   #120
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I have a 09 STI. Which two wires from the MAF need to be cut and spliced into my IAT?
Check out the appendix of our Speed Density guide which can be found in the help menu of the Accesstuner software.

Bill
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