What IAT's does everyone see at idle for 4-5 minutes?

[AdamInKC]

Just trying to understand what IAT's everyone sees at idle for 4-5 mins with different setups.

With my setup (new APR CPS), I tested this the other night to simulate what happens in staging lanes at the strip. With the car warmed up, I turned the A/C on with heat set to max (radiator fans on). Outside temp was around 60F.

My IAT's were hovering around 50-52C with the hood closed.

[DBL R]

waiting for loe to chime in with sub-ambient IAT's.....

[derek.kritz]

Just trying to understand what IAT's everyone sees at idle for 4-5 mins with different setups.

With my setup (new APR CPS), I tested this the other night to simulate what happens in staging lanes at the strip. With the car warmed up, I turned the A/C on with heat set to max (radiator fans on). Outside temp was around 60F.

My IAT's were hovering around 50-52C with the hood closed.

I'm dp EPL e85. Awe coldfront. I'm about right there too. ~50C. But that is without the ac on and turned to hot. Outside temp ~60F


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[xpoweruk]

I looked at that on my car last year.Result below after a long drive then parked in a car par waiting for the wife :)



For another reference point,the below is cruising at 70MPH or so last week

[4Rings3Liters]

Those numbers seem high especially with upgraded cooling. I'm stage 2 only with stock cooling and last week at the track I was seeing temps in the low 40s/high 30s with the AC running.

[k6750gsxr]

PLM with dp and see 39 to 41C holds steady there.

[audis4culver]

I have logging for a few days now about to install another micro fan to get ready for 100 degree outside air temps in atlanta. I am giac stage 2, plm hx with reservoir - yesterday in atlanta 88 degree weather sitting in traffic for about 4 minutes - consistent IAT is 40-43 that's after some good stop and go's between lights. no AC or heat fans on.

[4Rings3Liters]

Im glad I sent my APR CPS back, it seems it doesn't work (like everything else APR).

[audis4culver]

check this thread as well - there is more logging done by a variety of folks "IAT and Engine Coolant Temps "

[kelseysautobody]

PLM with dp and see 39 to 41C holds steady there.

That's what I see with PLM on the lower end. OP, have you tried bringing RPMs above 2000 and holding them there for a few seconds? Even with high heat and A/C on my temps will fluctuate up to 45-47*C. Once it reaches a certain point the pump will come on and bring the temps back down on its own but when I see the IAT's starting to go up I'll rev it a little to manually kick on the pump.

[Trent212]

Im glad I sent my APR CPS back, it seems it doesn't work (like everything else APR).

How's does a heat exchanger not work lol

[jran76]

Sitting idle without the fans running isn't really going to allow any heat exchanger to do it's job.

My IAT's when idling are very dependent on the ambient temps. I can easily see a range between 35-45 degrees.

[bhvrdr]

Sitting idle without the fans running isn't really going to allow any heat exchanger to do it's job.

My IAT's when idling are very dependent on the ambient temps. I can easily see a range between 35-45 degrees.

ditto. idle IATs arent really a measure of hx efficiency per se

[xpoweruk]

ditto. idle IATs arent really a measure of hx efficiency per se

Whilst that is true, I wouldn't expect the IAT's to be in the 50*C range when it is 15*C outside.
Add to that he had the heat on full wack with AC running & I think those reading are quite high

[Silverbullet S4]

Im glad I sent my APR CPS back, it seems it doesn't work.

How so?

[bhvrdr]

As a comparison mine get around 46-50c when idling in 21c ambients. They'll only top out at around 65c on a run but they start out pretty hot once the car has been through a run and heated up. I could go drive the car on the highway and get them down to 39c or so but we are usually packed at PBIR so no opportunity to do that.

Mike

[Loe]

waiting for loe to chime in with sub-ambient IAT's.....

its quite comical sometimes when logging to see IAT's, truly a no thought process needed to get maximum power (given the D/A) for practically each run with minimal waiting. Another local guy has his hooked up with the stock pump (Hx delete as well), he actually see's better IAT's than I do, enough that I'm considering putting back in my OEM pump and selling my AWE one.

[DBL R]

its quite comical sometimes when logging to see IAT's, truly a no thought process needed to get maximum power (given the D/A) for practically each run with minimal waiting. Another local guy has his hooked up with the stock pump (Hx delete as well), he actually see's better IAT's than I do, enough that I'm considering putting back in my OEM pump and selling my AWE one.

I can't bring myself to remove the stock Hx...I'm waiting for my KC and PLM reservoir to come in...Hopefully I'll have it all installed in the next week or so...

[4Rings3Liters]

How's does a heat exchanger not work lol

Ask APR.

How so?

Have you not read the OPs thread? IATs are in the 50s. Mine tonight at the track were in the low 40s with stock cooling.

[sonic32]

20C/68+F outside per car's MFI
This was after a short drive idling




After a drive literally around a city block and back to my driveway, slowed down to a stop sign, to a crosswalk and a redlight


This was idling for 5 minutes about after previous drive



This is where the fans kicked on and I switched the pump to 100% duty cycle via switch



This was after same drive around the block but I was stuck behind a car. Lowest IAT's went were 46C


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[4Rings3Liters]

Sonic, is that with APRs CPS?

[sonic32]

Sonic, is that with APRs CPS?

No this is with my home made set up but to put it into perspective
This was in moderate traffic on the highway. Dropped down to 28-32 at 60-70 mph


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[4Rings3Liters]

No this is with my home made set up but to put it into perspective
This was in moderate traffic on the highway. Dropped down to 28-32 at 60-70 mph


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What's your setup?

[sonic32]

What's your setup?

DIY stacked heat exchanger and reservoir upgrade
Post #224
https://r.tapatalk.com/shareLink?sha...8&share_type=t



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[kelseysautobody]

That "ambient air temp" in OBD fusion is all over the place. Do you know what sensor that reading pulls from? For 68*F outside those IAT's seem a little high. You have the coolant routed a little different correct?

[sonic32]

That "ambient air temp" in OBD fusion is all over the place. Do you know what sensor that reading pulls from? For 68*F outside those IAT's seem a little high. You have the coolant routed a little different correct?

Yeah I know for some reason it's all over the place. I think the sensor next to heat exchangers by the crash bar, hence it gets got in there from the engine. I think those IAT's correspond to that ambient sensor more than the MFI onemmm


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[EIAlfonso]

Tonight I came home after a 30 min drive from the office. Short time later I ran my car at idle for a good 20 mins in my garage while I registered my new battery and looked at a few other things with the software

I then set up a few logging parameters and was surprised that my IAT's were near 198 F (Ambient was 95F), while I was at idle. Typically when I'm out and about and do WOT runs it never gets above 130F.

I took the car out for a two minute drive and the IATS dropped to 140 almost instantly. I have a stacked heat exchanger which does well when the car is moving, but offers no help at all when parked.

This all makes sense to me I just didn't think a car at idle would heat up to nearly 200 degrees.

[DBL R]

Tonight I came home after a 30 min drive from the office. Short time later I ran my car at idle for a good 20 mins in my garage while I registered my new battery and looked at a few other things with the software

I then set up a few logging parameters and was surprised that my IAT's were near 198 F (Ambient was 95F), while I was at idle. Typically when I'm out and about and do WOT runs it never gets above 130F.

I took the car out for a two minute drive and the IATS dropped to 140 almost instantly. I have a stacked heat exchanger which does well when the car is moving, but offers no help at all when parked.

This all makes sense to me I just didn't think a car at idle would heat up to nearly 200 degrees.

This is what I've been noticing. Makes sense why the killer chiller cars are so consistent at the strip....

[FromRagsToS4]

So for people without killer chillers.... What can we do retain our maximum potential power and keep from heat soaking so bad just sitting there, like at a stop light and an M3 is talking smack, or in the staging lanes at the strip...?

[ReDeViL]

i'm out in a tropical climate in Asia, with ambient temperature ranging from 30-35 degrees Celcius.
With the AMS alpha kit, EPL DP setup with 183mm pulley, idle temps peak at 55 degrees Celcius.

main benefits of the ams kit is only seen when driving, where temps drops as low as 39/40 degrees celcius, measured via the P3 gauge with the updated track pack.
to be specific, the faster rate at which the temps drop after a hard run.