Who can tell me where to get a fast reacting closed element air temp sensor.

I would preferably want something that reacts as fast as the GM/haltech sensor.

I have read online that the GM/haltech water temp sensor which is used as an air temp sensor in some vehicles doesn't react fast enough for forced induction use.

I am spraying methanol 7-10 inches infront of the sensor and though it continues to work, I am concerned about it longevity.

 

I dont know the specs on this sensor, but this looks a lot like the small thread coolant sensor that haltech uses.

Part number 0 280 130 039

Here's a pic of it.

 

Seriously, I think "fast reacting" and "closed element" physically just don't go together. If you're worried about it, pull it every n months and inspect it.

 

With ^ or move the sensor in front of the spray nozzle. Summit has 3/8 NPT weld on bungs that could be welded to the IC piping.

 

having the sensor behind the spray is part of the system.

 

Yeah, you're kind of between a rock and a hard place. If the sensor is before the spray, your temperatures reading will have no relationship to reality under spray.
You really need a shielded open element, so it's not insulated but doesn't get direct spray. I've thought about doing this, with either epoxy (plastic cage sensors) or brazing (brass-cage), but who wants to screw with things in the intake path?

 

Here is the spec sheat for this sensor, including calibrations:

http://www.bosch-motorsport.de/pdf/s.../NTC_M12-L.pdf

I believe it would mount in any of the stock locations. Probably a good choice if running a big FMIC (very stable intake temps).

But if I'm reading this right the sensors reaction time is listed as <10 seconds. Thats not gonna cut it as the haltech/gm open element sensor react within less than 1 second.

 

So then you're saying is that this "closed element" sensor isnt better than the standard Haltech air temp sensor because it has the resistor exposed?

Im for using that bosch sensor just for the metric thread and since it apparently has a very similar scaling as the haltech one.

 

While I don't disagree that less than one second is more desirable that less than 10 seconds, is one second even fast enough? I'm not trying to sound like an ***, I'm actually asking. It seems like a LOT changes in the top of the power band (the most hectic part) in a single second. Anyone got any experience tuning AI in this fashion?

 

Actually, that's the slimmest closed-element screw-in sensor I've seen... that little bit of plastic enclosure probably provides negligible insulation value. It should certainly fare better than the coolant-temp sensors that have a good 1/4-inch of plastic and brass surrounding the thermistor on all sides.

... for a spray (meth/H2O) application, that sensor could be better than an open-element in some ways -- I always worry that the open element sensor reads artificially low due to surface-evaporation effects. But I'm probably nit-picking.

 

Without more details on their Response Time measurement, it's hard to tell if 10 seconds or 1 second make sense.
For an automotive environment, you can't really get much faster than a tiny open-element thermistor. I would think you get a great deal of accuracy within milliseconds - if not microseconds - for reasonable changes in temperature. But to get the specified (high) accuracy across the entire measurement range may take seconds.

Reaction time is largely a function of the mass of the sensor element, modified by how insulated it is. Tiny element/no insulation = fastest reaction time. Larger element/insulated = slow time.

 

Put the meth or water injector as far ahead of the IAT as possible and this will be less of a problem.