Request: air intake temp AIT data - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 06-19-2007, 05:31 PM   #41
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HLI - head light intake FTW
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Old 06-19-2007, 08:42 PM   #42
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Now THIS is telling... at 12 seconds I start the car. it'd been sitting ALL day...


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Old 06-19-2007, 09:01 PM   #43
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Fubar
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Old 06-19-2007, 09:02 PM   #44
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Should have bought a megasquirt!
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Old 06-19-2007, 10:32 PM   #45
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Black car FTL :gay:
I think the Link reads a constant 100c if the sensor is bad. But you get some slight variation. Pull that thing out and put the hair dryer on it with a thermometer for comparison.
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Old 06-19-2007, 11:33 PM   #46
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yep, I've got a Fluke with a thermocouple I can compare with.
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Old 06-20-2007, 03:31 AM   #47
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Here's some Hydra logs of my MSM. I have an AEM intake and a BEGI intercooler.

For the first log, I had just been sitting idling so the AIT started a little high. AIT stays steady at ~39-40C and it was around 20C ambient.

For the second log, I was climbing a steep mountain highway in the evening and at about ~15C ambient.
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Request: air intake temp AIT data-1234_pull.jpg   Request: air intake temp AIT data-upcut.jpg  
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Old 06-21-2007, 10:50 AM   #48
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(second log) I see the typical rise in your longest boost section, but definitely heat soak after that run since the AIT rises to 40c right at the end of the boost and remains there. I'm surprised to see the temps that high at 10psi with the BEGI IC- that's 20c over ambient.

I went out last night and made some runs at 8psi (stock wg) with a poor tune (still spanked a 350z). Made four runs- two were low rpm to 7k in fourth, and two were 1-4th gear to ~7k. By then end of those I had my AIT up to 48c. First run is shown below in a power graph (same settings that produce 250/250 from my dyno run). I think this confirms that the AIT compensation's IGN retard is killing top end since this pull only peak at 38c near 7k. The fall off at the end is the knock sensor picking a yet to be identified rattle. I can feel the difference in relative pull after 6k compared to the higher boost (and temp compensation - ign retard) of the 15psi runs. This also explains why the car always feels quicker on the first boosted run.

Curious how others have their IC positioned. Mine is as close as I can get it to the face of the a/c condenser. That's probably a 1/4" gap between the two. The face is pretty much fully exposed to oncoming air. - rob
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Old 06-21-2007, 11:26 AM   #49
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I've yet to see any of my air temps rise above 34c at 12psi. My intercooler is positioned ~ two inches away from the radiator. I do not have ac.

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Originally Posted by m2cupcar View Post

Curious how others have their IC positioned. Mine is as close as I can get it to the face of the a/c condenser. That's probably a 1/4" gap between the two. The face is pretty much fully exposed to oncoming air. - rob
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Old 06-21-2007, 12:28 PM   #50
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I'm convinced it's the size of your intercooler- you are running that 18x12 (or is it 12x12 - still 40% larger than mine) core right?
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Old 06-21-2007, 01:06 PM   #51
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Sounds about right. I think the core is 18x12x2.5.
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Old 06-21-2007, 04:31 PM   #52
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Quote:
Originally Posted by m2cupcar View Post
(second log) I see the typical rise in your longest boost section, but definitely heat soak after that run since the AIT rises to 40c right at the end of the boost and remains there. I'm surprised to see the temps that high at 10psi with the BEGI IC- that's 20c over ambient.
For the second log, in my longest boost the AIT is at 35C and rises to 36C afterwards. I should try taking my Moss high-flow grill (gasp! ) off and see if it makes a difference.

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Curious how others have their IC positioned. Mine is as close as I can get it to the face of the a/c condenser. That's probably a 1/4" gap between the two. The face is pretty much fully exposed to oncoming air. - rob
I don't have a/c and I haven't tried filling any of the gaps to improve airflow.
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Old 06-21-2007, 05:22 PM   #53
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What I'm getting at is that if it's 15c ambient, your AIT temp is substantially higher than that at 35c. Are you sure about this? That's before you're in boost? Usually you don't see temps like that until after you're deep into a boosted run. Your second log shows a min. AIT of 24c - so I assumed that you started your run at the min. and then rose to 34c with heat soak bringing it up to 36c after boost ended.

In my case, my IC is always 2c above ambient and only rises about 2c until I hit a peak boost of 15psi around 4500. At that point it's starts a rise for another 16c.
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Old 06-21-2007, 09:08 PM   #54
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Originally Posted by y8s View Post


more pics of the big phat intake pipe at this thread.

no dataz yet.
What are those shocks from?
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Old 06-21-2007, 09:10 PM   #55
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Can someone guide me with intake temp vs. timing? I need some sort of guideline to map the iat sensor. Should I pull 1deg per 10f? 20f? ect ect. Where's a good place to start here for the 1.8?
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Old 06-21-2007, 09:55 PM   #56
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Quote:
Originally Posted by lazzer408 View Post
What are those shocks from?
TEIN Flex with EDFC.
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Old 06-21-2007, 10:01 PM   #57
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Quote:
Originally Posted by lazzer408 View Post
Can someone guide me with intake temp vs. timing? I need some sort of guideline to map the iat sensor. Should I pull 1deg per 10f? 20f? ect ect. Where's a good place to start here for the 1.8?
You know I asked that at miata.net a few weeks ago and didn't get a single answer. IIRC, I'm pulling 1 deg timing per 10 deg F after 115. Not knocking now, was before turning on the IAT correction.
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Old 06-21-2007, 11:39 PM   #58
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intersting
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Old 06-22-2007, 02:37 AM   #59
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Quote:
Originally Posted by Ben View Post
You know I asked that at miata.net a few weeks ago and didn't get a single answer. IIRC, I'm pulling 1 deg timing per 10 deg F after 115. Not knocking now, was before turning on the IAT correction.
I haven't actually logged my temps yet. That's something I need to do. Did you have any fuel correction also?
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Old 06-22-2007, 02:57 AM   #60
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Quote:
Originally Posted by m2cupcar View Post
What I'm getting at is that if it's 15c ambient, your AIT temp is substantially higher than that at 35c. Are you sure about this? That's before you're in boost? Usually you don't see temps like that until after you're deep into a boosted run. Your second log shows a min. AIT of 24c - so I assumed that you started your run at the min. and then rose to 34c with heat soak bringing it up to 36c after boost ended.

In my case, my IC is always 2c above ambient and only rises about 2c until I hit a peak boost of 15psi around 4500. At that point it's starts a rise for another 16c.
I see what you're saying. I've just never had another point of reference before... Maybe I was wrong about the ambient temp? I can't really remember.

I just looked at the whole log again. I started it shortly after my car was started after work...the coolant was only at 45C. So the AIT was 24C basically from the start...maybe the sensor had heat-soaked in the engine bay for the 8 hours since I had parked it in the morning?

I then drove ~8 city blocks to the highway on-ramp with only a couple very minor boost events. At that point the AIT was already at 32C.

After driving on the highway in traffic for a bit then at the base of the hill the AIT was up to 34C.

After the boosted run up the hill the AIT was at 36C.

So it sure seems that it's really high all the time.

Coasting back down that same hill my coolant went from 95C to 88C but my AIT only went from 34C to 28C. I must be getting hardly any airflow through my intercooler.
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