A PD with a dedicated IAT sensor in the manifold post compressor/intercooler (hot side). We actually installed two stand alone units (different brands) along side the IAT sensor triggering the ECU.
And that's the rub. We originally ran ours with the sensor in the MAF and a second sensor in the manifold wired through the IMRC connector. The post compressor sensor was reading WAY wrong. At the time Lund told us to abandon the IMRC method and wire the IAT sensor in the manifold to the wiring that goes/went to the IAT sensor in the MAF. He fiddled around with how it was sampled from that point (it reads on the dash and the N Gauge) and it's a lot closer to reality, but it's still not 100% right. We no longer have the IAT being sampled at the MAF. But at least we're getting a close-ish reading post compressor/intercooler where it counts.
It responds instantly. But it can take up to 8 seconds to show what the actual temp is. For example. If you whack it with a 200deg air charge it will start to show you a temp rise instantly. But it will take up to 8 seconds to show the entire 200deg. So if you make a 4sec dyno pull with a 200deg air charge you may only see a 150deg reading. Which is of course not accurate and could be problematic if stuff is on the edge.
A friend of mine (a tuner) had suspected this for a long time and last year finally set up conditions to test it. It's a thing.
This is effectively what we ended up doing in the end. But when we did it there was no kit so we had to make it from scratch. Lund supplied us with the wiring schematic.http://www.lethalperformance.com/shop-now/vehicle-selector/ford-mustang-v8-gt/2015-ford-mustang-gt/supercharger-upgrades/whipple/vmp-2015-2016-mustang-gt-5-0l-iat-harness-and-brass-air-temp-sensor-for-pd-blowers.html
^^^ This is what I had to use for my Lund tune so that we could see the after blower temps. Lund wouldn't finish my tune prior to me installing this.
We originally wired into the IMRC but when it came time to tune Lund was not able to get that pin allocated for temp reading. Or reading correctly. Maybe he doesn't have the software access you do???How were you running through the imrc and reading temp? That has to be written in the code to allocate that pin for temp reading. I can assure you those readings are accurate.
Correct, the sensors that are used with PD blowers (I refer to them as "bulb style" for no reason in particular) that you find in most kits, GT500's, etc are nearly instantaneous. The sensors built into MAF sensors (I refer to them as "vane style" for no reason in particular) are very slow to stabilize and show the actual max temp. Maybe the sensor in the MAF's are updated/different in 2015+ cars, IDK. But all of them before won't read full IAT until up to 8 seconds.As for sensor response time, they are far faster then 50deg off over a 100deg rise in 4 seconds. Of course this depends on the type of sensor. A k-type sensor with an open element is extremely fast an accurate and is best for development.
What clutch are you running now?Thanks Whipple for making another awesome product! I'm get some track times next month after I get a clutch
We originally wired into the IMRC but when it came time to tune Lund was not able to get that pin allocated for temp reading. Or reading correctly. Maybe he doesn't have the software access you do???
I can assure you that the way we were hooked up/programmed those temps were not reading correctly. We had two additional stand alone IAT sensors/gauges to check it against. The reading was WAY off.
Correct, the sensors that are used with PD blowers (I refer to them as "bulb style" for no reason in particular) that you find in most kits, GT500's, etc are nearly instantaneous. The sensors built into MAF sensors (I refer to them as "vane style" for no reason in particular) are very slow to stabilize and show the actual max temp. Maybe the sensor in the MAF's are updated/different in 2015+ cars, IDK. But all of them before won't read full IAT until up to 8 seconds.
I don't know why it's not reading correctly. That's a tuner thing, and I'm no tuner.What I'm asking is how are you referencing the temp from the imrc channel of its not able to be read without the specific pid info?
I'm guessing it's because you have deeper access in to the ECU.To be clear this reading is very accurate for our cal and is accurate if you have the pid info.
Yes, the IAT2 sensors are accurate (not perfect though) and they react almost instantaneously to temperature changes.The temp reading is of OEM quality and reacts and reads exactly like any ecoboost engine.
I'm now assuming we're talking about IAT1's/MAF temp readings.As for temp response time, I think you are confusing that with sample rate.
Correct. But no matter how often you update/prioritize the MAF temp sensor doesn't react to the temp change any faster. The issue isn't sample rate. It's how fast the actual sensor element reacts to change. And it's slow to see big temperature fluctuations..The speed in which each sensor is updated varies depending on cal and there importance level.
Correct.A proper iat2 sensor will have an increased sample rate compared to iat1 because its importance level and variation can change far quicker and more frequent.