Relocating IAT sensor Any point?
Posted 22 September 2010 - 02:55 PM
Don't shoot me down in flames :D but...
I know that in later models, Honda relocated the IAT sensor into the intake tract. The problem is when i monitor the IAT values if the car has been sitting for a while (5mins) it gets heated up by the intake manifold in some instances it hits mid 60c - this is when its around 15-20c ambient outside too.
When on the move it takes a wee while to drop down (hovers around 50c when pootling around slowly) but i believe the stock ECU retards timing if above 45c in WOT? (which it can in some instances), however the temps do drop down when i put my foot down.
Just wondering if its worth relocating and capping off?, however i dont know if its feasible as Honda would have likely tested and coded in the high temp values into the ECU map??
Just seems a bit of a design fault and not a 100% representation of true air temp.
Posted 23 September 2010 - 11:14 AM
if you move it, then you dont know the true temp of the air going into the combustion chamber. having it on the intake manifold, or the oven as i like to joke, tells you how hot the air is right before it goes into the combustion chamber. yeah the sensor gets hot, but thats because the intake mani is hot, and just like the sensor is being heated up, so is the air, its an interheater so to speak.
so your choice, move it and see lower numbers, or keep it there and see higher numbers, but in both cases, once car is tuned for that location, its gonna work the same. stock ecu i def wouldnt move it.
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Posted 23 September 2010 - 01:18 PM
If you get an AEM you may want to do it but with a piggy back or KPRO you will be waisting your time. Even the AEM does not have a good algorithm for fuel trims based on the AIT, to do it right you would need a better ECM like a Motec.
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Posted 23 September 2010 - 02:16 PM
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Posted 23 September 2010 - 02:20 PM
Posted 23 September 2010 - 09:59 PM
KPRO is just not that flexible, you only have a few sensors that can be used b/c there is now way to easily change the calibration. They do have trims that can be tuned but there is serious lack of resolution only (5) cells for low and high load. That is why I am not sold on the KPRO as a whole, there is a lack of user ajustablity however for a simple build it is sure a lot easier.
Posted 24 September 2010 - 12:24 AM
Leave the IAT sensor where it is, relocating it will not cool the air, will just show you a lower reading. Retarding timing above 45 might actually be a good thing since you are not running AEM.
Posted 06 November 2010 - 09:20 PM
Here's my experience and opinion on this for what its worth. The IAT sensor's tip is a metal probe, which we know from basic thermal dynamics, will induce a small delay into the time it takes the sensor to actually report a change in intake air temp.
Based on the following, I think a better IAT sensor could be used. The high performance SeaDoo's I work with come in a few different performance models with only very slight changes. There is a supercharged model, and a Supercharged Intercooled model. The Supercharged model has an IAT sensor that is the same design that is used in our cars. It has a metal probe tip. However the Supercharged Intercooled model has a different upgraded sensor. I would post pics, but I don't have the proper forum access to do so for some reason... Long story short, the higher end sensor does not have a metal probe, it is a more open design,looks like a diode with a small plastic cage around it to protect the sensor element. I was curious of the differences and why the use of the different IAT sensor in the higher HP rated motor configuration and did some testing of my own on the two sensors. Turns out the difference is the sensor without the metal probe responds to changes in temperature MUCH quicker than the sensor that has the metal probe.
So moving the sensor just changes how you perceive the AIT, a sensor that has a quicker response time to temp changes WOULD be a very worthwhile upgrade!
I'll try and do some research on part numbers, and get some pics of the two sensors for comparison, etc... But being that I already have a temperature calibration table for the Seadoo sensors, I may drill/tap my intake for one of the more responsive SeaDoo sensors..
This post has been edited by Boostaholic: 07 November 2010 - 02:13 PM
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