10-16-2018, 08:33 AM | #15 | |
Drives: 2017 Camaro 2SS Join Date: Dec 2016
Location: Houston
Posts: 469
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For the LT1 we have to isntall a pigtail harness to run the IAT2 which then reads as IAT1 through the OBDII port to the P3 gauge. This is the temp that is way off on mine. I spoke with a buddy at GM yesterday and it seems the ZL1 often runs very hot with no worries of temps exceeding 140's-150s. Can someone provide a log showing that the blower temps are only 10* higher than the ambient outside air? This morning the blower was 100-110 with outside temps of 55* and high humidity(it is misting here in Houston). Once I got into stop and go traffic the temps climbed up to the 130s from lack of air flow. One other thing that was mentioned was a possible heat shield between the valley cover/heads and the blower. Is this a stock part that I should have under my blower? Is it possible I am seeing higher temps due to heat transfer from the engine? Thanks everyone for your help here. I am learning on my first supercharged vehicle and every piece of advice is appreciated. |
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10-16-2018, 02:40 PM | #16 | |
Drives: ZL1 ATS-V CTS-V C7Z Range Sport SC Join Date: Mar 2016
Location: Cincinnati, OH
Posts: 580
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10-16-2018, 04:06 PM | #17 |
Drives: 2017 Camaro 2SS Join Date: Dec 2016
Location: Houston
Posts: 469
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Thank you for all the input, I thought I had everything out, but I must not. Going to try either driving the car up onto a 2x4 or even jacking the front end up a bit and seeing if the air bubble will come to the bleed valve on the front of the blower. I did take the time to read the article...or most of it. Very interesting read, but the chiller is a bit too pricey for me right now.
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10-16-2018, 04:10 PM | #18 |
Drives: 2017 Camaro 2SS Join Date: Dec 2016
Location: Houston
Posts: 469
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Also, after talking talking Ted the SS does not actually read the IAT1s as it is relocated to the TMAP Sensor.
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10-16-2018, 04:53 PM | #19 | |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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I can post some screen shots later from some of my logs. I can tell you mine are never more than 20 degrees apart though. I’ll show you what mine looks like on a steady freeway drive. I log ambient temp, IAT1, IAT2, and MAT. |
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10-17-2018, 09:22 AM | #20 | |
Drives: 2017 Camaro 2SS Join Date: Dec 2016
Location: Houston
Posts: 469
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I won't be able to tell what the variance is between my IAT1 and IAT2, but will know what approx ambient is based on the MyLink outside temp. I also wonder if my catless Speed Engineering headers are playing a role in the rise in temp during stop and go traffic...although even at a steady freeway cruise temps are in the 120s with it being in the 50s here in Houston. Somehow I will get this figured out and then get this beast over to MS Tuning for a couple dyno pulls and a solid number. |
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10-17-2018, 02:45 PM | #21 | |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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Mine never gets anywhere near 120 when driving in similar conditions, and I also have headers. I took mine to run a few errands last night, but it was all city type driving without very much airflow over the heat exchangers. Even after parking the car and letting it heat soak, it was only 25 degrees above ambient. It was about 70 outside, IAT1 was reading 75, and IAT2 was 95. Had I jumped on the freeway, it would have dropped pretty quickly. Maybe a dumb question, but have you checked the temps after the car sits overnight and completely cools? If the sensor has been calibrated correctly, it should read within a degree or two of the ambient reading. I’ll try to do a longer drive or look to see if I have any logs with good data. |
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10-17-2018, 04:42 PM | #22 |
Drives: 2017 Camaro 2SS Join Date: Dec 2016
Location: Houston
Posts: 469
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I'll check that here in a few when I leave work. Car has been sitting now for about 10 hours outside. It's 63 outside and I'm guessing the temp will be close...if not then maybe we have an issue there. This would be something the tuner could adjust correct? I don't know my way around HP Tuners, but I'm sure I can get him to take care of it if this is the issue.
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10-17-2018, 07:35 PM | #23 | |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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10-18-2018, 02:29 PM | #24 | |
Drives: 2017 Camaro 2SS Join Date: Dec 2016
Location: Houston
Posts: 469
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Yesterday afternoon the temp was within 3 degrees of the MyLink when I fired her up...almost makes me think the calibration is correct and I am still looking at air in the line somewhere. On another note, a buddy of mine who is also here on the forums logged his A10 ZL1 and after sitting at idle for 10 minutes the blower temps were 127. This is with no other driving. Did not see what the temps were when driving though. I will be back to the drawing board tomorrow morning when I am off work for the day and able to see if I can find an air pocket anywhere and make changes to the sensor calibration if needed. Does anyone have a screen shot of an LT1-LT4 tune that shows the scaling for NA MAP or NA TIAP? Is there a difference? Again, thank you everyone for your assistance here. The forum has been very welcoming to questions in the 2 years I have had the Camaro...some forums just aren't that way. |
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10-18-2018, 05:12 PM | #25 | |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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Was your buddy logging manifold air temp or IAT2? Big difference as you probably know. Sitting there at idle is one thing — both IAT readings will climb when you do that. Even an NA engine does this. But they should drop pretty quickly once you get moving. I wouldn’t be too worried about that. I’d be much more concerned with what it reads on say a steady freeway cruise or a high speed pull. I haven’t driven the car much this week, but I’ll take it out this weekend for sure. I have a bunch of logs, but I don’t really keep track of the conditions and what I was doing. I’ll get a fresh one for you so I can tell you exactly what the data reflects. |
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10-18-2018, 08:00 PM | #26 | |
Drives: 2017 Camaro 2SS Join Date: Dec 2016
Location: Houston
Posts: 469
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10-18-2018, 08:29 PM | #27 |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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So here’s a quick screen shot of my IAT2 sensor curve. If you’re running the ZL1 T-MAP, then I’d assume these are the values that should be in your IAT1 table.
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10-20-2018, 04:59 PM | #28 |
Drives: ZL1/335i Join Date: Apr 2014
Location: Santa Barbara
Posts: 870
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I took the car out for a drive today, and grabbed a few logs like I promised. We’re having a freak October heat wave, so it was 90-91 degrees outside the entire trip. I started the car cold, let it idle for about 10 minutes, and did another 5 minutes of stop and go driving before getting on the freeway. The freeway drive was about 15 minutes.
When I exited the freeway, the My Link was showing 91 degrees. My IAT1 was at 93 degrees, and IAT2 was at 100 degrees. I did probably another 10 minutes of city driving before parking the car to run into Best Buy, then to grab some lunch. This gave it a good chance to heat soak. IAT1 had crept up to 104, and IAT2 had reached 111 by the time I shut it off. This was after sitting at a few stop lights and moving through slow moving traffic in 90+ degree temps. After letting the car sit parked for 20 minutes or so, it was warm. When I started it up, IAT1 was at 129, and IAT2 was 133. Not too shocking considering it was 91 degrees and parked with a fully warmed up engine. I headed back to the freeway, and temps had dropped to 95 degrees (IAT1) and 122 (IAT2) by the time I hit the on-ramp. This was only about 3 minutes of driving at 50 mph or so. After 8 minutes on the freeway (including a quick WOT pull to speeds I won’t mention), temps had dropped to 91 degrees on IAT1 (exactly what the My Link display was showing), and IAT2 was at 102. I hope that helps as to the delta between ambient temp and IAT2 on a ZL1 with stock heat exchangers during normal driving. As you can see, my IAT2s are typically no more than 10 degrees over ambient as long as the engine hasn’t been shut off and allowed to heat soak, or sit idling in traffic. And even after letting it sit and hit over 130 degrees, it quickly recovered. |
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