MSPNPPro-MSM0405 Sensor Inputs - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-15-2015, 05:53 PM   #21
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Originally Posted by Braineack View Post
so basically the same values mazda always uses.
No, I plotted them out and what I measured is different at low temperatures.
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Old 01-15-2015, 08:00 PM   #22
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No, I plotted them out and what I measured is different at low temperatures.
I realize you did that, numbers just seem close to Mazda clt values.
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Old 01-15-2015, 10:30 PM   #23
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We are talking about the air temp sensor that is threaded in near the throttle body correct? My stock one in the car measures 42.8k at 62 degrees f which is what my garage is currently sitting at. I took several measurements and put it in but wasn't sure where to set the bias resistor at. I played with the bias value until the values were not completely out of whack but found that the slow response was not desirable.
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Old 01-15-2015, 10:49 PM   #24
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when you say slow, how slow are we talkin?

cause it doesn't need to react like a wideband or something.

the only time it needs to go up fast is during a boosted pull when temps climb, and even then they usually go up pretty slow.

and It's good enough for the oem ecu, so I'm sure it should still be useable on the MS
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Old 01-16-2015, 09:03 PM   #25
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Quote:
Originally Posted by Ben View Post
These values were obtained by subjecting a MSM intake air temp sensor to various conditions and measuring its resistance. I no longer have a MSM at the shop, so would appreciate if someone could try this calibration on their car:
24F
7800 ohms
72F
2110 ohms
190F
396 ohms
These appear to be the values for the first AIT sensor (airbox) in the MSM. The service manual lists:
68F - 2.21-2.69k
176F - 0.29-0.354k

Quote:
Originally Posted by linkless View Post
We are talking about the air temp sensor that is threaded in near the throttle body correct? My stock one in the car measures 42.8k at 62 degrees f which is what my garage is currently sitting at. I took several measurements and put it in but wasn't sure where to set the bias resistor at. I played with the bias value until the values were not completely out of whack but found that the slow response was not desirable.
These appear to be the values for the AIT2 sensor in the MSM (just upstream of the throttle body) This is the one for which we need the correct curve. The service manual lists the following for AIT2:
-4F - 357k
32F - 112k
68F - 41k
77F - 33k
104F - 17k
140F - 8k
185F - 3.5k

Mine appeared to match these values reasonably well.
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Old 01-16-2015, 09:35 PM   #26
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Quote:
Originally Posted by Elmos hers View Post
These appear to be the values for the first AIT sensor (airbox) in the MSM. The service manual lists:
68F - 2.21-2.69k
176F - 0.29-0.354k



These appear to be the values for the AIT2 sensor in the MSM (just upstream of the throttle body) This is the one for which we need the correct curve. The service manual lists the following for AIT2:
-4F - 357k
32F - 112k
68F - 41k
77F - 33k
104F - 17k
140F - 8k
185F - 3.5k

Mine appeared to match these values reasonably well.
I will double check with the person who measured the sensor for me.

The values entered to our base tune came straight from the service manual.
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Old 01-17-2015, 09:39 AM   #27
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Ben, would you please post a photo of the sensor you checked?
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Old 01-17-2015, 07:26 PM   #28
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Originally Posted by Elmos hers View Post
Ben, would you please post a photo of the sensor you checked?
I purchased a MSM IAT #2 (from the throttle pipe), and handed it to one of my guys to test. I don't have a picture; it's probably on his desk at the office. I'm at home. I was about to say I take a day off here and there, but I've put in about 8 hours or so today.
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Old 01-20-2015, 12:42 PM   #29
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So... Good ol Phil thought the IAT#2 was a coolant temp sensor, and gave me values for IAT#1.

Here are correct values for IAT#2 calibration
8F 199k
72F 35.6k
180F 3.8k

These values correspond to data posted by Elmos hers (which DOES NOT correspond to Alldata!)

Sorry for the confusion, folks. Should be all fixed now.
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Old 02-08-2015, 11:23 PM   #30
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So I am thinking of buying one of these. How well does it run with the stock base map? Is it a conservative enough map for it to be safely drivable without a custom tune?

sorry, I posted this in the wrong place. Mods please feel free to move this.
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Old 03-23-2015, 07:44 PM   #31
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Quote:
Originally Posted by Ben View Post
So... Good ol Phil thought the IAT#2 was a coolant temp sensor, and gave me values for IAT#1.

Here are correct values for IAT#2 calibration
8F 199k
72F 35.6k
180F 3.8k

These values correspond to data posted by Elmos hers (which DOES NOT correspond to Alldata!)

Sorry for the confusion, folks. Should be all fixed now.
Ben,
what is the bias resistor value?

*EDIT: Called DIY and spoke w/ Matt, who pointed me to megasquirtpnp.com, I had no idea about that page.

On it I found the values, and after using the "GM" drop down which gives you a bias resistor value of 249something (I forget the specific number) populated the values in, seems to be working now

In case anyone needs them:
temp in F-ohms
8-199000
72-35600
180-3800

Last edited by 18psi; 03-24-2015 at 11:53 AM.
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Old 03-27-2015, 11:29 PM   #32
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All MSPNPs to date use 2490 ohm resistors as bias resistors, which is the default setting.
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